This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of welding protective clothing. This standard applies to welding protective clothing made of fabric, leather or fabric made by film or spraying, and made by sewing technology. GB 15701-1995 Welding protective clothing GB15701-1995 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Welding protective clothing
Protective clothing for welders 1 Subject content and scope of application
GB15701-1995
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of welding protective clothing. This standard applies to welding protective clothing made of fabric, leather or fabric made by film or spraying, and made by sewing technology.
2 Reference standards
GR2661
Single clothing for men and women
Test methods for physical and chemical properties of finished leather products GB4689
Vertical method for the determination of flammability of textile fabrics
GB5455
Test methods for static electricity of textiles
GB/T 12703
GB 13640
Labor protective clothing type
GB/T13661
3 Classification
-General anti-expansion clothing
Classification of welding protective clothing:
1. Separate lower body type:
h, one-piece pants type.
Note: Both can be equipped with aprons, sleeves, shawls, shoes and other accessories. 4 Technical requirements
4.1 Properties of general and auxiliary materials
4.1.1 Types of materials
4.1.1.1 Fabric:
pure twill cloth;
b. leather; Www.bzxZ.net
film cloth:
d. instant coating;
others (carbon fiber and glass fiber cloth, etc.). 4.1.1.2 Auxiliary materials
a. pure cotton sewing thread;
iron or bakelite hooks.
4.1.2 Materials - General properties
Approved by the State Administration of Technical Supervision on September 11, 1995, 181
Implementation on March 1, 1996
4.1.2.1 Fabrics
GB 15701--1995
The warp breaking strength of cotton fabrics and other fabrics shall not be less than 9.11N and the weft breaking strength shall not be less than 4.11N; Leather tensile strength:
Cow face>16N/mm\;
Pig face≥10 N/mm2
4.1.2.2 Sewing thread single thread strength shall not be less than 800N/50cm. 4.1.3 Material safety performance
4.1.3.1 Flame retardant performance
The material of welding protective clothing shall meet the following requirements: a.
Afterflaming time shall not exceed 15;
Smoldering time shall not exceed
Damage length shall not exceed 100mm
4.1.3.2 Anti-metal droplet impact performance
Tested according to Appendix A (Supplementary), its performance shall meet the following requirements: After 15 drops of metal droplets impact, the temperature rise of the test sample shall not exceed 40K. 4.1.3.3 Anti-electricity
The electrostatic impedance value of welding protective clothing shall not be less than 0.1mA. 4.2 Model
The model size shall comply with the provisions of GB13640. The size of sleeves, shawls and shoe covers is shown in Table 1. Table 1
4.3 Sewing requirements
Shoulder width 50, front length 290, back length 400
Sleeve length 5031, sleeve hem 200)
Length × width 350 × 250
The allowable deviation of the main parts of the equipment shall comply with the provisions of GB2661. The stitch density shall comply with the provisions of 6.3 of GR/T13661. The garment making process shall be:
The collar, cuffs and trouser legs shall be elastic and tight; the pockets must be covered and the seams shall be smooth; the buckle hooks shall be hidden when metal buckles are used. 4.4 Appearance
The appearance requirements shall comply with the provisions of 6.5 of GB/T13661. 5 Test methods
5.1 The inspection of ladder fabrics shall be carried out in accordance with the provisions of 6.5 of G13:T13661. 5.2 The inspection of leather fabrics shall be carried out in accordance with the provisions of G1689. 5.3 The flame retardant performance shall be carried out in accordance with the provisions of GB5455. 5.4 The anti-metal droplet impact performance shall be carried out in accordance with the provisions of Appendix A (Supplement). 5.5 The electrical resistance shall be carried out in accordance with the provisions of 7.3 of (G13/T12703) 5.6 The specifications and sewing quality inspection of the finished products shall be inspected item by item in accordance with the provisions of 4.2~4.3. 6 Inspection rules
6.1 The inspection of welding protective clothing is divided into two categories: type inspection and output inspection. The inspection items and unqualified classification shall comply with the requirements of Table 2 and Table 3.
Classification of unqualified items
GB15701-1995
Table 2 Inspection items for welding protective clothing
Size
Needle pitch density
Clothing process
Appearance requirements
Fabric breaking strength
Leather physical and chemical properties
Flame retardant properties
Anti-metal droplet impact performance
Electrical resistance
Type inspection
Table 3 Classification of unqualified items for welding protective clothing
Appearance requirements
Factory inspection
Anti-metal
Anti-metal droplet impact electrical resistance
6.2 Inspection shall be carried out in batches, with the supply batch as the inspection batch, or it can be determined by negotiation between the factory and the buyer. The inspected explosion-proof protective clothing shall be randomly selected from the inspection batch.
6.3 Inspection and sampling shall be carried out in accordance with the provisions of GB/T136618.5~~8.8. 7 Marking, packaging, transportation and storage
7.1 Each product shall have the factory name, trademark, model and inspection certificate. The outer packaging shall have the factory name, product name, product number, quantity and date of manufacture.
The packaging shall be neat and firm, and the quantity shall be accurate. A moisture-proof barrier shall be provided between the product and the outer packaging. If there are special requirements for the outer packaging, the supply and demand parties shall negotiate 7.3
The product shall not be damaged during transportation, and the sun shall be prevented. 7.4 The product shall be stored in a cool, dry and ventilated place. 186
A1 Principle
GB15701-1995
Appendix A
Determination of the impact resistance of molten gold droplets on the material
(Supplement)
Determine the number of drops required for the sensor behind the sample to rise in temperature by 40K when the molten gold droplets impact the sample vertically. A2 Test apparatus
A2.1 Apparatus for producing molten metal droplets (Figure A1) Use an oxyacetylene welding torch to melt one end of a metal wire (rod), the diameter of the welding nozzle is 1.2mm±0.1mm, and the movement of the metal wire (rod) is controlled by a motor controlled by a pulley system. The center line of the welding nozzle is perpendicular to the metal wire (rod), and the distance between the welding nozzle and the gold wire (rod) is adjustable (Figure A2). The supply rate of oxygen and acetylene is controlled by a flow meter.
Unit: Amy
Droplet guide
|Temperature rise sensor support
Shock rise sensor
Metal droplet impact device and schematic diagram
Motor
System full c
GB15701-1995
Can suspected droplet guide machine tree explosion my center line
System exhaust distance at
Metal drop
Welding torch Nozzle
Figure A2 Device for producing molten metal droplets
A2.2 Droplet guide mechanism (Figure A3)
Welding gun rod
This mechanism is used to collect molten metal droplets and guide them to the vertically placed sample. It includes a funnel-shaped guide groove coated with polytetrafluoroethylene and an adjustable bracket to fix it. The guide groove is inclined at 45° relative to the vertical plane, and its diameter can pass a metal wire (rod) with a diameter of 5mm±0.2mm. The guide groove is covered and covered when not in use. 188
A2.3 Temperature sensor of display alarm
GB15701—1995
Figure A3 Melt droplet guide mechanism
Unit, mm
The sensor support material is made of refractory insulating material, whose thermal conductivity is 0.125W/(m·K)±0.015W/(m·K) at 40C, and specific heat capacity is 1.15J/(g·K). The dimensions are shown in Figure A4. The temperature sensor can be connected through the wires of the two holes near the center of the groove, and the sensor support is fixed to the sample frame by bolts on the four sides. The sensor uses a platinum resistor coated with polytetrafluoroethylene, 1002 at 0C, plate-shaped, 12.5mm×10mm in size. There is a groove of 13.5mm×11mm on the outer surface of the sensor support, which is just embedded in the sensor support h. The protruding part is 0.5mm±0.2mm and is embedded in the groove with heat-resistant adhesive. The sensor is connected to an electronic instrument that can convert the resistance change value into temperature difference! Its resolution is ±0.5K
A2.4 Sample frame
GB157011995
Transducer
Figure A4 Sensor support seat
Unit: mm
Sensor
-Adhesive
Heat-resistant insulating material
Sensor support seat
The sample frame also supports the sensor. The sample is tightened by pulleys and weights (Figure A5). The weights of the weights on both sides of the tightened sample are 175g±5g or the sample end is fixed, and the other end is placed with a 175g±0.5g weight. The position of the sample can be adjusted in both vertical and horizontal directions. Transducer support seat
U-type clamp
A2.5 Metal wire (rod)
Figure A5 Sample frame
The linear density of the metal wire (rod) p=0.5g/cm±0.2g/cm. A3 Specimen
Cut a 120mm×20mm cloth piece from the test cloth at least 50mm away from the edge as the test specimen, leaving 15mm on each side of the specimen so that the specimen can be clamped and fixed (Figure A6). Cut at least 10 specimens and place the specimens in an environment of 20°C±2°C and relative humidity of 65%±2% for 24 hours.
A4 Steps
A4.1 Test conditions
GB 15701-1995
Figure A6 Specimen
Unit: mm
Outer surface of the specimen
Test in a naturally ventilated room without other heat sources. The room temperature change for each test should not exceed ±5K. Before the test, the temperature sensor (insulated support) should be stabilized at the ambient temperature ±2K. A4.2 Preparation of the metal wire (rod) Adjust the motor speed to feed the wire at a rate of 10/min ± 1g/min, adjust the torch position and gas flow, and produce droplets (mass m) at a frequency f. The frequency is measured by recording the time required to melt a predetermined number of metal droplets in seconds, excluding the first drop. The mass and frequency of each drop of molten droplet are determined as follows:
m==0.50min+0.03g (the mass difference before and after the gold rod when 20 drops are melted is divided by 20) f=20 drops/mim(±3s)
The parameters at the beginning of the test are as follows:
Oxygen pressure 250kPa
Acetylene pressure 50kPa
The distance from the metal wire (rod) to the welding torch nozzle = 12m The length of the dark blue flame core of the welding torch is 8mm
Use the lowest actual gas flow to minimize the hazard of molten droplet splashing, and place the metal wire (rod) so that it is at the highest point of the fire melting temperature, even if the metal wire (rod) is just in front of the dark flame core. A4.3 Determination
Place the sample frame so that the distance from the horizontal axis of the welding torch nozzle to the horizontal center line of the sensor is 110mm ± 10mm, adjust the distance from the axis of the metal wire (rod) to the surface of the sensor (contacting the sample) to 60mm ± 10mm, and adjust the distance from the axis of the metal wire (rod) to the vertical center axis of the sensor (opposite the nozzle) to 15mm ± 10mm (Figure A1). Make the molten guide tip tilted 45° to ensure the collection of metal droplets and impact them on the sample (on the horizontal position of the sensor), and set the distance from the sample surface to the nearest groove to 1.5mm ± 1mm ​​(Figure A1). Fix the sample on the frame clamp so that the sensor is completely covered and tightened, and the front side (outer surface) must face the molten droplet. For each test, record the number of molten droplets X, and the temperature of the back side (inside) of the test sample rises by 40K. Test 10 samples in one test.
To avoid the first droplet from clogging the guide groove (because the droplets that were not removed in the previous test formed knots on the welding wire, making the volume of the first drop larger than 191
GB15701-1995
), the first droplet should be removed with a rod before starting the test. A5
Result processing
When the temperature rise is 40K, the number of drops used is more than 15 drops, which is qualified. When the average value of 10 samples is between 15.0~~15.5, it is necessary to repeat the group test, and the result is the average value of 20 samples. A6 Experimental report
The test report should include the following contents:
Specimen specifications and parameters, especially surface density (g/m2); indicate the reference standard:
Test results and average values ​​of each sample; observed abnormal phenomena (such as; smoke, flame, etc.); indicate the steps of the test that are not carried out in accordance with this standard, plus any conditions that may affect the test results or may increase the hazard:
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Labor Protection Products. This standard was drafted by the General Research Institute of Construction of the Ministry of Metallurgy. The main drafters of this standard are Hong Jun and Bai Xiaoliang. 192
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