GB/T 8118-1995 General technical requirements for arc welding machines
Some standard content:
National Standard of the People's Republic of China
General Technical Conditions for Arc Welding Machines
The general specification for arc welding machines1 Subject content and scope of application
This standard specifies the general technical conditions, test methods and acceptance rules for arc welding machines. GB/T 8118—1995
Replaces GB 8118—87
This standard applies to various types of arc welding machines (hereinafter referred to as welding machines) under general use conditions. If there are special requirements for various types of welding machines, they should be supplemented on the basis of this standard. 2 Reference standards
GB15579 Safety requirements for arc welding equipment Part 1: Welding power supply GB156 Rated voltage
GB2423.3 Basic environmental test procedures for electrical and electronic products Test Ca: Steady-state damp heat test method GB/T2900.1 Electrical terminology Basic terms
GB2900.22 Electrical terminology Electric welder
GB7945 Arc welding equipment Safety requirements for welding power supply plugs, sockets and couplers GB10249 Method for compiling electric welder models
GB/T13165 Method for determining noise of arc welders JB2836 Electroplating and chemical coverings of electrical products JB/T5256 Inspection and sampling methods for electric welders 3 Terminology
The terms used in this standard conform to the provisions of GB/T2900.1 and GB2900.22. 4 Basic parameters and models
4.1 Rated current level
Rated current level of welding machine, for those above 100A, it is recommended to be classified according to the R10 priority number system; for those below 100A, it is recommended to be classified according to the R5 priority number system, and for those above 2000A, it is negotiated between the manufacturer and the user. The rated current grades are as follows (A): 10, 16, 25, 40, 63, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 20004.2 Rated duty cycle (%)
20, 35, 60, 80, 100.
Note: ①20% duty cycle is only applicable to isolated welding transformers with welding current less than or equal to 200A. ②Introduced products and stud welding machines are not subject to this restriction. 4.3 Working cycle
10 min, continuous.
Approved by the State Administration of Technical Supervision on June 2, 1995 and implemented on August 1, 1996
4.4 Current adjustment range
4.4.1 Minimum welding current
Manual arc welding machine and TIG welding machine
GB/T 8118-1995
Less than or equal to 20% of the rated welding current.
Note: It is not applicable to arc welding transformers with a duty cycle of 20% and a current less than or equal to 200A. b. Other welding machines are specified by product standards,
4.4.2 Maximum welding current
Greater than or equal to 100% of the rated welding current. 4.5 Conventional welding current and load voltage
The welding power source shall be able to provide the conventional welding current under the conventional load voltage in accordance with the formulas in 4.5.1 to 4.5.4 within the entire adjustment range.
Wherein: U,--
Load voltage, V
Welding current, A.
4.5.1 Manual arc welding with coated electrodes
U2 -- 20+0. 0412
When the current is greater than 600A, the voltage is kept constant at 44V. 4.5.2
TIG welding
U,=10+0. 0412
When the current is greater than 600A, the voltage is kept constant at 34V. 4.5.3MIG/MAG welding
U, = 14+0. 0512
When the current is greater than 600A, the voltage is kept constant at 44V. 4.5.4Submerged arc welding
Falling characteristic
U, 20+0. 0412
When the current is greater than 600A, the voltage is kept constant at 44V. Flat characteristic
Uz = 14 +0. 0512
When the current is greater than 600A, the voltage is kept constant at 44V. Note: Higher voltages may be permitted under agreement. 4.6Model
The model of the welding machine shall comply with the provisions of GB10249. Note: Imported products are not subject to this restriction.
5 Conditions of use
5.1 Range of ambient air temperature
During welding
During transportation and storage
5.2 Relative humidity of air
At 40℃
At 20℃
~10+40℃
—25~+55℃
≤50%
5.3 The dust, acid, corrosive gas or substance in the ambient air shall not exceed the normal content, except those generated by the welding process. Note: Different conditions of use can be agreed upon between the manufacturer and the user. 108
5.4 The altitude shall not exceed 1000m.
5.5 For welding machines using water cooling
Minimum ambient temperature
The inlet temperature of cooling water shall not exceed
GB/T 8118-1995
+30℃
Note: If cooling water with antifreeze is used, the minimum ambient temperature can be reduced accordingly, subject to the condition of no freezing. 6 Technical conditions
6.1 The rated frequency of the power supply of the welding machine is 50Hz, and the rated voltage shall comply with the standard voltage specified in GB156. 6.2 The welding machine shall operate normally under the conditions that the power supply voltage is an actual sinusoidal waveform and the following power supply quality of the power grid. Supply voltage fluctuation
Frequency fluctuation
The asymmetry rate of the three-phase power supply system shall not exceed 5%. 6.3 The change rate of the welding current or load voltage under rated conditions in cold and hot states shall not exceed ±5%. 6.4 The change rate of the welding current or load voltage under rated conditions shall not exceed ±5% when the power supply voltage fluctuates by ±10%. Note: Welding machines without feedback control are not subject to this restriction. 6.5 The rate of change of wire feeding speed and welding speed under rated conditions when the power supply voltage fluctuates ±10% shall be specified by the product standard. 6.6 The efficiency of the welding machine shall be specified by the product standard. 6.7 The percentage of no-load current to rated current shall be specified by the product standard. 6.8 The quality of the water used for cooling the welding machine shall meet the industrial water standard, and its water cooling system shall be able to work normally under the specified water inlet pressure without water leakage or seepage.
6.9 The gas system of the welding machine shall be able to work normally under the specified air inlet pressure without air leakage. 6.10 The traction force of the wire feeding mechanism and the traveling mechanism shall ensure uniform wire feeding and traveling, and the traction force shall be specified by the product standard. 6.11 The surface protective layer of the unpainted ferrous metal parts in the welding machine, except for the friction fitting part, shall meet the requirements of Class 1 in JB2836.
6.12 The coating of the welding machine should be smooth and flat, with uniform thickness, without cracks, bubbles, wrinkles or peeling. 6.13 Fixed-installed welding machines should have mounting holes, and the mounting dimensions should be marked in the corresponding documents or drawings. 6.14 The completeness of the welding machine is specified by the product standard. 6.15 The control system for automatic and semi-automatic welding machines should be able to ensure the setting and adjustment of the welding machine's working parameters, and have the necessary procedures and actions for the normal operation of the welding machine. The indicator of the welding parameters should be easy to observe. 6.16 The welding machine should have good static and dynamic characteristics. In the entire adjustment range, it should be able to ensure easy arc ignition and stable arc burning. 6.17 The welding current, load voltage, wire feeding speed and welding speed adjustment mode of the welding machine can be stepless, stepped or mixed adjustment. The difference between the two adjacent gear values in stepped adjustment shall not be greater than 15% of the larger gear; in mixed adjustment, there should be overlapping parts. Note: Arc welding transformers and stud welding machines with a duty cycle of 200A or less and a duty cycle of 20% are not subject to this restriction. 6.18 When the voltage and current values are output with scale indication, the indication accuracy shall not be less than ±10%; if a voltmeter or ammeter is used, its accuracy shall not be less than Class 2.5.
6.19 Noise
When the welding machine is running under normal use conditions, there shall be no abnormal noise. The noise limit of the A-weighted sound power level of the power supply in the welding machine at the rated welding current shall comply with the provisions of Table 1. 109
Rated welding current
Noise limit for static arc welding power source without fan
Stationary arc welding power source with fan
GB/T8118--1995
Note: ①For welding machines with a current greater than 630A, the noise limit shall be determined through consultation with the user. ②The noise of rotary arc welding power source shall be specified by the product standard. 6.20
The power supply in the welding machine should be able to adapt to the damp and hot environment. After the damp and hot test, it can withstand the assessment of 70% of the specified value of the dielectric strength test voltage, and there should be no breakdown or flashover. Before the dielectric strength test, measure the insulation resistance first as a reference. 6.21 Radio interference limit
Users who have restrictions on the radio interference of the welding machine should negotiate and resolve the issue when placing an order. 6.22 The safety requirements for welding power supply should comply with the provisions of GB15579, and the welding cable plugs, sockets and couplers should comply with the provisions of GB7945.
The wiring terminals of the protective conductor of the welding machine should comply with the provisions of GB15579. 6.24 The cross-section and length of the cable used with the welding machine shall be specified by the product standards. 6.25 The packaging, storage and transportation of the welding machine shall be specified by the product standards. 7
Test method
The welder to be tested should be new and dry, and tested under the conditions of use specified in this standard. 7.1 The accuracy or precision of the measuring instruments used for testing is as follows: a.
The instrument used to measure electrical parameters shall not be lower than Class 0.5; b. Thermometer ±0.5℃; c. The power factor of the load resistance shall not be less than 0.99. 7.2 Appearance inspection
7.2.1 General inspection
Before the test, the assembly quality of the welder shall be inspected, such as whether the screws, bolts and nuts used for fastening are tightened, whether the cooling fan, various adjustment devices and driving rollers are flexible, whether various signs meet the requirements of the drawings, whether the data on the nameplate is complete and correct, and whether the grounding device is reliable.
7.2.2 Dimensions and weight inspection
a. Use a tape measure to measure the length, width and height of the welder, mm; b. Use a bench scale to measure the weight of the welder, kg. 7.3 Current and voltage adjustment range, step difference and indication accuracy measurement 7.3.1 Power supply state
During type inspection, the power supply should be carried out in a hot state, and during factory inspection, it can be carried out in a cold state; a.
The input end of the power supply should maintain the rated voltage and rated frequency, and the corresponding load voltage shall comply with the relevant provisions of Article 4.5. 7.3.2 Current and voltage adjustment range The maximum output and minimum output points of the power supply should be measured, and the welding current and load voltage should be recorded at the same time. 110
GB/T8118—1995
7.3.3 When the current and voltage are adjusted in steps, the step difference should be measured between the two adjacent steps and calculated according to formula (1): Step difference = larger step value larger step value smaller step value × 100% larger step value
7.3.4 Determination of the accuracy of the current and voltage scale indication value The accuracy of the current and voltage indication value is calculated according to formula (2): Indication accuracy = indication value × 100%
Indication value
7.4 Efficiency
Efficiency determination is carried out under thermal equilibrium.
The measured efficiency of the power supply is equal to the ratio of the output power to the input power under rated conditions. 7.5 No-load test
7.5.1 Power supply status
(1)
The no-load test of the power supply refers to the measurement of the no-load current and power of the whole machine under the conditions that the input terminal is connected to the rated voltage and rated frequency and the output terminal is not connected to the load.
The no-load current measurement in the type inspection shall be carried out in the hot state; a.
The no-load current measurement in the factory inspection can be carried out in the cold state. b.
7.5.2 The no-load test of the power supply shall be carried out at the rated output position. During the test, the voltage, current and power at the input terminal shall be measured; the input power shall be measured using a power meter with a low power factor; a.
b. If the input is three-phase, the measured no-load current value shall be taken as the arithmetic mean value as the actual no-load current value of the power supply. 7.5.3 The no-load current percentage shall be calculated according to formula (3): I.
where oN is the no-load current at the rated position, A; IiN is the rated input current at the rated position, A. 7.6 Determination of static external characteristics
×100%
.(3)
The determination of static external characteristics shall be carried out at the three output states of maximum, minimum and rated position. During the determination, the input voltage and frequency shall be kept at the rated value.
7.6.1 For the falling characteristic power supply, the load resistance shall be adjusted so that the output end is from no-load to short circuit, and the number of measurement points shall be not less than 8 points. The output voltage and current at each position shall be recorded, and the static external characteristic curve shall be drawn accordingly. When the maximum welding current is equal to the rated welding current, the determination shall also be carried out at the output state of 50% rated current. 7.6.2 For the flat characteristic power supply, the load resistance shall be adjusted so that the output end is from no-load to rated value, and the number of measurement points shall be not less than 8 points. The output voltage and current at each position shall be recorded, and the static external characteristic curve shall be drawn accordingly. 7.6.3 The determination shall be carried out in the hot state.
7.7 Determination of dynamic characteristics of manual arc welding power supply
The dynamic characteristics determination conditions are as follows:
During the determination process, the input should be kept at rated voltage and rated frequency. a
b. The determination should be carried out at two points: rated welding current and 20% rated welding current. At this time, the load voltage should comply with the relevant provisions of Article 4.5. After the output terminal of the welding machine is connected to the cable, it should be directly short-circuited by a contactor of sufficient capacity, and the resistance of its external circuit should be 0.008~c
0.010. If it is necessary to compare the dynamic characteristics of two or more welding machines, they should be carried out under the same external resistance d. The determination should be carried out in the hot state.
The oscillogram should include the voltage, current, and time scale three lines and the corresponding calibration values 7.8 Determination of the cold and hot change rate of welding current and load voltage 7.8.1 The test should be carried out at the rated position, and the corresponding load voltage should comply with the relevant provisions of Article 4.5. 7.8.2 Power supply status
a. The test starts in the hot state;
GB/T 8118—1995
b. During the test, keep the input at the rated voltage and rated frequency, adjust the welding current to the specified value, and run to the thermal stability state according to the corresponding duty cycle:
During the test, the input current, voltage and power as well as the welding current and load voltage at the output end should be recorded; and record once every 30minc.
until thermal equilibrium;
d. The test can refer to the wiring method of the temperature rise test. As in the temperature rise test, place the thermocouple thermometer on each winding with a higher temperature rise. When the temperature count value does not exceed 2K per 1h, it is considered to be thermally balanced, e. After the hot current measurement is completed, the power supply is cooled to a cold state. For a falling characteristic power supply, its cold current is measured. At this time, the load resistance is adjusted so that the load voltage complies with the relevant provisions of Articles 4 and 5. For an apple characteristic power supply, its cold load voltage is measured. At this time, the load resistance is adjusted so that the welding current complies with the relevant provisions of Article 4.5. 7.8.3 The cold and hot state change rate of the welding current is calculated according to formula (4): Alas = = × 100%
Where: 12e——
Welding current when the power supply is in a cold state, A;
I2h---Welding current after the power supply is thermally stable, A, A is the cold and hot state current change rate.
7.8.4 The cold and hot state change rate of the load voltage is calculated according to formula (5): Uz - Uz × 100%
AUeh =
Wherein: U2
The load voltage when the power supply is in the cold state, V;
The load voltage after the power supply is thermally stabilized, V:
AUeh——Cold and hot state load voltage change rate 7.9 Wire feeding speed change rate
7.9.1 Wire feeding mechanism state
a. The hose between the wire feeding mechanism and the welding torch is kept straight; b. No welding is performed.
7.9.2 Test method
The test is carried out under the three conditions of 90%, 100% and 110% of the rated value, and the following two states are measured respectively. Maximum wire feeding speed and minimum welding wire diameter; a.
Minimum wire feeding speed and maximum welding wire diameter. b.
Measure the length of the welding wire passing through the wire feeding mechanism within a period of not less than 10s. 7.9.3 Calculation of the rate of change of wire feeding speed
A0. = l. 2 l × 100%
The calculation result shall take the larger absolute value.
Wherein: VeN-
Wire feeding speed at rated voltage;
V-Wire feeding speed when the supply voltage is 90% and 110% of the rated value; Ave———rate of change of wire feeding speed.
Wire feeding speed U.=L/T
L---Wire feeding length, m;
T——Time, S.
7.10 Welding speed change rate
7.10.1 Welding machine status
. (5)
GB/T8118—1995
The guide rail of the welding machine travel mechanism should be horizontal or in actual use status; b.
No welding is performed.
7.10.2 Test method
The test is carried out under the condition that the power supply voltage is 90%, 100% and 110% of the rated value. The distance traveled by the travel mechanism is measured within a period of not less than 30s. 7.10.3 Calculation of welding speed change rate
The calculation result takes the larger absolute value.
Welding speed at rated voltage;
Where: UiN ---
or - enl
× 100%
Welding speed when the power supply voltage is 90% and 110% of the rated value: Au
Welding speed change rate.
S--Distance traveled by the travel mechanism, m
T---Time, s.
7.11 Determination of welding current and load voltage change rate when the power supply voltage fluctuates7.11.1 State of power supply
· (7)
The test should be carried out after the temperature rise test. When the supply voltage is 90%, 100% and 110% of the rated value, the welding current of the falling characteristic power supply and the load voltage of the flat characteristic power supply are measured. 7.11.2 The welding current change rate is calculated according to formula (8): 12 — 12Nl
×100%
The calculation result takes the larger absolute value.
In the formula: I——
The welding current measurement value when the supply voltage fluctuates, A: IzN
The welding current value under the rated state, A; wwW.bzxz.Net
The welding current change rate.
7.11.3 The load voltage change rate is calculated according to formula (9): AU: = UUnl × 100%
The calculation result takes the larger absolute value.
In the formula: U2—- The load voltage measurement value when the supply voltage fluctuates, V; U2n-- The load voltage value under the rated state, V; AU,—The load voltage change rate.
7.12 Measurement of traction force of wire feeding mechanism
7.12.1 State of wire feeding mechanism
When the wire feeding and hose are disconnected, the traction force is measured with the maximum wire diameter and the minimum wire feeding speed. 7.12.2 Test method
(9)
The test is carried out by lifting the static load with the wire feeding wheel. During the test, an ammeter is connected to the armature circuit of the wire feeding motor. When the armature current does not exceed the rated value, if the lifting is uniform and there is no slippage, the load weight at this time is the traction force of the wire feeding mechanism of the welding machine. 7.13 Sealing test
7.13.1 Gas circuit sealing test
Apply soapy water to all joints between the ventilation pipe and the welding machine, and at the same time, pass compressed air into the gas circuit for 1 minute to observe whether there is leakage or deformation of the gas pipe. The test should be carried out when the gas outlet of the welding torch hose is blocked. 113
GB/T8118—1995
a. The pressure of the gas path from the pressure reducing valve to the electromagnetic gas valve device is 0.3MPa; b.
The pressure of the gas path after the electromagnetic gas valve device is 0.1MPa. 7.13.2 Water-cooling system sealing test
Water with a pressure of 0.3MPa is passed through the water cooling system for 1 minute to observe whether there is any water leakage. The test is carried out when the water outlet is blocked.
7.14 Noise
The noise test method of the welding machine shall be carried out in accordance with the provisions of GB/T13165. 7.15 Wet heat
Determine the adaptability of the welding machine to use and store under constant wet heat conditions. The test is carried out in accordance with the provisions of GB2423.3, and the following detailed provisions are made: a. Before the test of the welding machine, the insulation resistance and dielectric strength test shall be carried out in accordance with the requirements of this standard; b. The welding machine shall not be packaged or powered on, and shall be placed in normal use conditions; c. The test period is 2 days; during the test, no electrical performance test shall be carried out. At the end of the test, the welding machine shall be restored for 1~2 hours under normal atmospheric conditions, with a temperature of 15~35℃. Note: Normal atmospheric conditions are: temperature, relative humidity, 45~75% and air pressure of 86~106kPa. f. After the test, use a clean cloth to remove surface moisture; g. After the welding machine is restored, the insulation resistance measurement and dielectric strength test shall be carried out again. 7.16 Interchangeability test. Interchangeable parts of welding machines of the same specifications and models shall be interchangeable. Interchangeable parts shall be specified in the product standard. 7.16.1 The interchangeable parts of any two welding machines produced according to the same drawing shall be disassembled and then installed interchangeably. 7.16.2 The reassembled welding machine shall be subjected to the following tests: a. Current adjustment range measurement,
b. Rated load operation for 30 minutes.
7.17 Completeness inspection
The random technical documents, packing list, welding machine factory qualification certificate, instruction manual and various spare parts and accessories shall be checked to see if they are complete.
Welding test
The test methods and specifications of welding test shall be specified by the product standard. 8 Inspection rules
8.1 The welding machine shall be inspected and qualified by the technical inspection department of the manufacturer before it can be shipped, and shall be accompanied by documents proving the quality or grade of the welding machine. 8.2 Inspection classification
The inspection of welding machines is divided into:
a. Factory inspection;
b. Type inspection.
8.3 Factory inspection
Each welding machine shall be inspected before leaving the factory, and the inspection items are specified by the product standards. 8.4 Type inspection of welding machines shall be carried out in the following cases, and the sample size of type inspection is recommended to be sampled according to the provisions of JB/T5256. Trial-produced new welding machines:
b. The welding machine has major changes in design, process, and materials used; H4
Welding machines that are not produced frequently are produced again,
GB/T8118-1995
The factory inspection results of welding machines have an unacceptable deviation from the previous type inspection results: d.
Batch products are inspected regularly.
8.5 In addition to all factory inspection items, type inspection shall also include safety test items specified in GB15578. 8.6 After inspection, the product shall be judged according to JB/T5256 to determine whether it is qualified or not. 8.7 The manufacturer may also agree with the user to conduct acceptance under the following conditions: The manufacturer may provide the user with a copy of the welding machine test report; a.
Acceptance is conducted in the manufacturer and supervised by the user on site; b.
Acceptance is conducted at the installation site designated by the user; d.
Inspection or random inspection of various data and performance; e.
Inspection or acceptance can be conducted after assembly is completed or during the manufacturing process. For welding tests required by the user, the test pieces can be handed over to the user for storage. f.
9 Warranty period
If the user uses and stores the welding machine correctly in accordance with the manufacturer's instruction manual, the manufacturer shall ensure that the welding machine can operate well within one year of use (but not more than 18 months from the date of shipment from the manufacturer). If the welding machine is damaged or cannot work normally due to manufacturing quality within this specified period, the manufacturer shall repair or replace parts or welding machines for the user free of charge. Additional Notes:
This standard was proposed and managed by the National Electric Welding Machine Standardization Technical Committee. This standard was drafted by the Chengdu Electric Welding Machine Research Institute. The main drafters of this standard are Lin Youting and Jin Xueying. 115= UUnl × 100%
The calculated result shall be the larger absolute value.
Where: U2—-the measured value of the load voltage when the supply voltage fluctuates, V; U2n--the load voltage value under the rated state, V; AU,--the rate of change of the load voltage.
7.12 Measurement of the traction force of the wire feeding mechanism
7.12.1 State of the wire feeding mechanism
When the wire feeding and the hose are disconnected, the traction force is measured with the maximum wire diameter and the minimum wire feeding speed. 7.12.2 Test method
(9)
The test is carried out by lifting the static load with the wire feeding wheel. During the measurement, an ammeter is connected to the armature circuit of the wire feeding motor. When the armature current does not exceed the rated value, if the lifting is uniform and there is no slippage, the load weight at this time is the traction force of the wire feeding mechanism of the welding machine. 7.13 Sealing test
7.13.1 Gas circuit sealing test
Apply soapy water to all joints between the vent pipe and the welding machine, and pass compressed air into the gas circuit for 1 minute to observe whether there is leakage or deformation of the gas pipe. The test should be carried out when the gas outlet of the welding torch hose is blocked. 113
GB/T8118—1995
a. The pressure of the gas circuit from the pressure reducing valve to the electromagnetic gas valve device is 0.3MPa; b.
The pressure of the gas circuit after the electromagnetic gas valve device is 0.1MPa. 7.13.2 Water cooling system sealing test
Pass water with a pressure of 0.3MPa into the water cooling system for 1 minute to observe whether there is water leakage. The test is carried out when the water outlet is blocked.
7.14 Noise
The noise test method of the welding machine shall be carried out in accordance with the provisions of GB/T13165. 7.15 Wet and hot
Determine the adaptability of the welding machine to be used and stored under constant wet and hot conditions. The test shall be carried out in accordance with the provisions of GB2423.3, and the following detailed provisions shall be made: a.
Before the welding machine is tested, the insulation resistance and dielectric strength shall be tested in accordance with the requirements of this standard; b.
The welding machine shall not be packaged or powered on, and shall be placed in normal use conditions; c
The test cycle is 2 days;
During the test, no electrical performance test shall be carried out
At the end of the test, the welding machine shall be restored for 1~2 hours under normal atmospheric conditions, with a temperature of 15~35℃
Note: Normal atmospheric conditions are: temperature
relative humidity 45~75%
air pressure 86~106kPa
f. After the test, use a clean cloth to remove the surface moisture; g. After the welding machine is restored, the insulation resistance measurement and dielectric strength test shall be carried out again. 7.16 Interchangeability test
The interchangeable parts of welding machines of the same specification and model shall be interchangeable. Interchangeable parts shall be specified in the product standard. 7.16.1 The interchangeable parts of any two welding machines produced according to the same drawing shall be disassembled and then installed in reverse. 7.16.2 The reassembled welding machine shall be subjected to the following tests: a. Current adjustment range measurement,
b. Rated load operation for 30 minutes.
7.17 Completeness inspection
The random technical documents, packing list, welding machine factory qualification certificate, instruction manual and various spare parts and accessories shall be checked to see if they are complete.
Welding test
The test method and specification of welding test shall be specified by the product standard. 8 Inspection rules
8.1 The welding machine must be inspected and qualified by the technical inspection department of the manufacturer before it can leave the factory, and it should be accompanied by documents proving the quality or grade of the welding machine. 8.2 Inspection classification
The inspection of welding machines is divided into:
a. Factory inspection;
b. Type inspection.
8.3 Factory inspection
Each welding machine should be inspected before leaving the factory, and the factory inspection items are specified by the product standards. 8.4 The welding machine shall be inspected and tested in the following cases. The sample size of the type inspection is recommended to be sampled according to the provisions of JB/T5256. Trial-produced new welding machine:
b. The welding machine has major changes in design, process and materials used; H4
The welding machine that is not frequently produced is produced again,
GB/T8118-1995
The factory inspection result of the welding machine is not allowed to deviate from the previous type inspection result: d.
The batch products are regularly inspected.
8.5 In addition to all factory inspection items, the type inspection shall also include the safety test items specified in GB15578. 8.6 After inspection, the product shall be judged according to JB/T5256 to determine whether it is qualified or not. 8.7 The manufacturer may also agree with the user to conduct acceptance under the following conditions: The manufacturer may provide the user with a copy of the welding machine test report; a.
Acceptance is conducted in the manufacturer and supervised by the user on site; b.
Acceptance is conducted at the installation site designated by the user; d.
Inspection or random inspection of various data and performance; e.
Inspection or acceptance can be conducted after assembly is completed or during the manufacturing process. For welding tests required by the user, the test pieces can be handed over to the user for storage. f.
9 Warranty period
If the user uses and stores the welding machine correctly in accordance with the manufacturer's instruction manual, the manufacturer shall ensure that the welding machine can operate well within one year of use (but not more than 18 months from the date of shipment from the manufacturer). If the welding machine is damaged or cannot work normally due to manufacturing quality within this specified period, the manufacturer shall repair or replace parts or welding machines for the user free of charge. Additional Notes:
This standard was proposed and managed by the National Electric Welding Machine Standardization Technical Committee. This standard was drafted by the Chengdu Electric Welding Machine Research Institute. The main drafters of this standard are Lin Youting and Jin Xueying. 115= UUnl × 100%
The calculated result shall be the larger absolute value.
Where: U2—-the measured value of the load voltage when the supply voltage fluctuates, V; U2n--the load voltage value under the rated state, V; AU,--the rate of change of the load voltage.
7.12 Measurement of the traction force of the wire feeding mechanism
7.12.1 State of the wire feeding mechanism
When the wire feeding and the hose are disconnected, the traction force is measured with the maximum wire diameter and the minimum wire feeding speed. 7.12.2 Test method
(9)
The test is carried out by lifting the static load with the wire feeding wheel. During the measurement, an ammeter is connected to the armature circuit of the wire feeding motor. When the armature current does not exceed the rated value, if the lifting is uniform and there is no slippage, the load weight at this time is the traction force of the wire feeding mechanism of the welding machine. 7.13 Sealing test
7.13.1 Gas circuit sealing test
Apply soapy water to all joints between the vent pipe and the welding machine, and pass compressed air into the gas circuit for 1 minute to observe whether there is leakage or deformation of the gas pipe. The test should be carried out when the gas outlet of the welding torch hose is blocked. 113
GB/T8118—1995
a. The pressure of the gas circuit from the pressure reducing valve to the electromagnetic gas valve device is 0.3MPa; b.
The pressure of the gas circuit after the electromagnetic gas valve device is 0.1MPa. 7.13.2 Water cooling system sealing test
Pass water with a pressure of 0.3MPa into the water cooling system for 1 minute to observe whether there is water leakage. The test is carried out when the water outlet is blocked.
7.14 Noise
The noise test method of the welding machine shall be carried out in accordance with the provisions of GB/T13165. 7.15 Wet and hot
Determine the adaptability of the welding machine to be used and stored under constant wet and hot conditions. The test shall be carried out in accordance with the provisions of GB2423.3, and the following detailed provisions shall be made: a.
Before the welding machine is tested, the insulation resistance and dielectric strength shall be tested in accordance with the requirements of this standard; b.
The welding machine shall not be packaged or powered on, and shall be placed in normal use conditions; c
The test cycle is 2 days;
During the test, no electrical performance test shall be carried out
At the end of the test, the welding machine shall be restored for 1~2 hours under normal atmospheric conditions, with a temperature of 15~35℃
Note: Normal atmospheric conditions are: temperature
relative humidity 45~75%
air pressure 86~106kPa
f. After the test, use a clean cloth to remove the surface moisture; g. After the welding machine is restored, the insulation resistance measurement and dielectric strength test shall be carried out again. 7.16 Interchangeability test
The interchangeable parts of welding machines of the same specification and model shall be interchangeable. Interchangeable parts shall be specified in the product standard. 7.16.1 The interchangeable parts of any two welding machines produced according to the same drawing shall be disassembled and then installed in reverse. 7.16.2 The reassembled welding machine shall be subjected to the following tests: a. Current adjustment range measurement,
b. Rated load operation for 30 minutes.
7.17 Completeness inspection
The random technical documents, packing list, welding machine factory qualification certificate, instruction manual and various spare parts and accessories shall be checked to see if they are complete.
Welding test
The test method and specification of welding test shall be specified by the product standard. 8 Inspection rules
8.1 The welding machine must be inspected and qualified by the technical inspection department of the manufacturer before it can leave the factory, and it should be accompanied by documents proving the quality or grade of the welding machine. 8.2 Inspection classification
The inspection of welding machines is divided into:
a. Factory inspection;
b. Type inspection.
8.3 Factory inspection
Each welding machine should be inspected before leaving the factory, and the factory inspection items are specified by the product standards. 8.4 The welding machine shall be inspected and tested in the following cases. The sample size of the type inspection is recommended to be sampled according to the provisions of JB/T5256. Trial-produced new welding machine:
b. The welding machine has major changes in design, process and materials used; H4
The welding machine that is not frequently produced is produced again,
GB/T8118-1995
The factory inspection result of the welding machine is not allowed to deviate from the previous type inspection result: d.
The batch products are regularly inspected.
8.5 In addition to all factory inspection items, the type inspection shall also include the safety test items specified in GB15578. 8.6 After inspection, the product shall be judged according to JB/T5256 to determine whether it is qualified or not. 8.7 The manufacturer may also agree with the user to conduct acceptance under the following conditions: The manufacturer may provide the user with a copy of the welding machine test report; a.
Acceptance is conducted in the manufacturer and supervised by the user on site; b.
Acceptance is conducted at the installation site designated by the user; d.
Inspection or random inspection of various data and performance; e.
Inspection or acceptance can be conducted after assembly is completed or during the manufacturing process. For welding tests required by the user, the test pieces can be handed over to the user for storage. f.
9 Warranty period
If the user uses and stores the welding machine correctly in accordance with the manufacturer's instruction manual, the manufacturer shall ensure that the welding machine can operate well within one year of use (but not more than 18 months from the date of shipment from the manufacturer). If the welding machine is damaged or cannot work normally due to manufacturing quality within this specified period, the manufacturer shall repair or replace parts or welding machines for the user free of charge. Additional Notes:
This standard was proposed and managed by the National Electric Welding Machine Standardization Technical Committee. This standard was drafted by the Chengdu Electric Welding Machine Research Institute. The main drafters of this standard are Lin Youting and Jin Xueying. 11517 Completeness inspection
Check whether the random technical documents, packing list, welding machine factory qualification certificate, instruction manual and various spare parts and accessories are complete.
Welding test
The test method and specification of welding test are specified by the product standard. 8 Inspection rules
8.1 The welding machine can only leave the factory after passing the inspection of the technical inspection department of the manufacturer, and it should be accompanied by documents proving the quality or grade of the welding machine. 8.2 Inspection classification
The inspection of welding machines is divided into:
a. Factory inspection;
b. Type inspection.
8.3 Factory inspection
Each welding machine should be inspected before leaving the factory, and the factory inspection items are specified by the product standard. 8.4 The welding machine shall be inspected in the following cases, and the sample size of the type inspection is recommended to be sampled according to the provisions of JB/T5256. New trial-produced welding machine:
b. The welding machine has major changes in design, process and materials used; H4
Welding machines that are not frequently produced are produced again,
GB/T8118-1995
The factory inspection results of the welding machine are not allowed to deviate from the previous type inspection results: d.
Batch products are regularly inspected.
8.5 In addition to all factory inspection items, type inspection should also include safety test items specified in GB15578. 8.6 After inspection, the product shall be judged according to JB/T5256 to determine whether it is qualified or not. 8.7 The manufacturer may also agree with the user to conduct acceptance under the following conditions: The manufacturer may provide the user with a copy of the welding machine test report; a.
Acceptance is conducted in the manufacturer and supervised by the user on site; b.
Acceptance is conducted at the installation site designated by the user; d.
Inspection or random inspection of various data and performance; e.
Inspection or acceptance can be conducted after assembly is completed or during the manufacturing process. For welding tests required by the user, the test pieces can be handed over to the user for storage. f.
9 Warranty period
If the user uses and stores the welding machine correctly in accordance with the manufacturer's instruction manual, the manufacturer shall ensure that the welding machine can operate well within one year of use (but not more than 18 months from the date of shipment from the manufacturer). If the welding machine is damaged or cannot work normally due to manufacturing quality within this specified period, the manufacturer shall repair or replace parts or welding machines for the user free of charge. Additional Notes:
This standard was proposed and managed by the National Electric Welding Machine Standardization Technical Committee. This standard was drafted by the Chengdu Electric Welding Machine Research Institute. The main drafters of this standard are Lin Youting and Jin Xueying. 11517 Completeness inspection
Check whether the random technical documents, packing list, welding machine factory qualification certificate, instruction manual and various spare parts and accessories are complete.
Welding test
The test method and specification of welding test are specified by the product standard. 8 Inspection rules
8.1 The welding machine can only leave the factory after passing the inspection of the technical inspection department of the manufacturer, and it should be accompanied by documents proving the quality or grade of the welding machine. 8.2 Inspection classification
The inspection of welding machines is divided into:
a. Factory inspection;
b. Type inspection.
8.3 Factory inspection
Each welding machine should be inspected before leaving the factory, and the factory inspection items are specified by the product standard. 8.4 The welding machine shall be inspected in the following cases, and the sample size of the type inspection is recommended to be sampled according to the provisions of JB/T5256. New trial-produced welding machine:
b. The welding machine has major changes in design, process and materials used; H4
Welding machines that are not frequently produced are produced again,
GB/T8118-1995
The factory inspection results of the welding machine are not allowed to deviate from the previous type inspection results: d.
Batch products are regularly inspected.
8.5 In addition to all factory inspection items, type inspection should also include safety test items specified in GB15578. 8.6 After inspection, the product shall be judged according to JB/T5256 to determine whether it is qualified or not. 8.7 The manufacturer may also agree with the user to conduct acceptance under the following conditions: The manufacturer may provide the user with a copy of the welding machine test report; a.
Acceptance is conducted in the manufacturer and supervised by the user on site; b.
Acceptance is conducted at the installation site designated by the user; d.
Inspection or random inspection of various data and performance; e.
Inspection or acceptance can be conducted after assembly is completed or during the manufacturing process. For welding tests required by the user, the test pieces can be handed over to the user for storage. f.
9 Warranty period
If the user uses and stores the welding machine correctly in accordance with the manufacturer's instruction manual, the manufacturer shall ensure that the welding machine can operate well within one year of use (but not more than 18 months from the date of shipment from the manufacturer). If the welding machine is damaged or cannot work normally due to manufacturing quality within this specified period, the manufacturer shall repair or replace parts or welding machines for the user free of charge. Additional Notes:
This standard was proposed and managed by the National Electric Welding Machine Standardization Technical Committee. This standard was drafted by the Chengdu Electric Welding Machine Research Institute. The main drafters of this standard are Lin Youting and Jin Xueying. 115
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