Some standard content:
National Standard of the People's Republic of China
Steel Wires for Gas Shielded Welding
Stcrl wires for gas shielded welding 1 Subject content and applicable scope
CB/T 14958-94
Replaces GB1300:7?
This standard specifies the classification, code, size, shape, weight, technical requirements, test methods, inspection rules, packaging, transportation, storage marks and quality certificates of steel wires for gas shielded welding (referred to as welding wires). This standard applies to cold-drawn steel wire for low carbon steel, low alloy steel and alloy steel using gas expansion welding (C), C), + (), C (+Ar) 2 Reference standards GB 222 Sampling method for chemical analysis of steel Allowable deviation of chemical composition of finished products GB 223 Chemical analysis of steel and alloys GB 2103 General provisions for acceptance, packaging, marking and quality certificate of steel wire GR 2650 Impact test method for welded joints GB 2652 Tensile test method for weld (and cladding) metal GB/T 3429 Steel wire rod for welding 3 Terminology 3.1 Relaxed diameter: the distance between the center of the circle and the circumference of the circle after the outermost circle of the steel wire is cut from the wire shaft and placed on a smooth plane without any constraint.
3.2 Warp distance: the distance from any point on the steel wire to the smooth plane after the outermost circle of the steel wire is cut from the wire shaft and placed on a smooth plane without any constraint. 4 Classification and code
4.1 According to the surface state, it is divided into copper-plated steel, and the copper-plated code is DT. 4.2 According to the delivery state, it is divided into bundle (disk) and winding shaft. The code for bundle (disk) is KZ, and the code for winding shaft is CZ. 5 Dimensions, shape, weight
5.1 Dimensions and allowable deviations
5.1.1 The wire diameter and its allowable deviation shall comply with the provisions of Table 1 State Technical Supervision Bureau 1994-06-13 Approved for implementation on January 1, 1995
Nominal diameter
GB/T14958—94
General accuracy
5.1.2 The out-of-roundness of the steel wire should not be greater than half of the tolerance of the first diameter. Allowable end difference
Higher accuracy
-- 15. C14
5.1.3 According to the agreement between the supply and demand parties, steel wires of intermediate sizes can be supplied, and the allowable deviation of the size shall be in accordance with the specified value of the larger size in Table 1. 5.1.4 Steel wires requiring higher precision or other precision shall be indicated in the contract. 5.2 Appearance
5.2.1 The bundle (coil) of steel wire shall be regular and shall not be scattered or in the shape of a \\. 5.2.2 The wound steel wire shall be tightly wound on the steel wire reel. The tail end shall be obvious and easy to disassemble. 5.3 Weight
5.3.1 The effective inner diameter of the bundle (coil) and the weight of each bundle (coil) of steel wire shall comply with the provisions of Table 2 Table 2
Nominal diameter, n
Inner diameter of steel wire bundle (coil)
Not less than, mm
Weight of each bundle (coil) of steel wire
Not less than. kg
5.3.2 Weight of each spool of steel wire-strand should be 15~-20kg. According to the agreement between the supply and demand parties, other single-spool reels of steel wire can also be supplied. 5.4 Marking example
Example 1H08Mn2SiA diameter 1.2tntn. Coil (coil) without copper plating for gas protection is marked as: H08Mn2iA-1.2-KZ-GR/T 14958—94 I
Example 2 H08Mn2Si wire diameter 1.6mm, copper-plated gas shielded welding wire is marked as: H08Mn2Si-1.6-C2-DT GB/T1495894
6 Technical requirements
6.1 The wire rod used to make the wire should comply with the specifications of GB 3429. 6.2 The grade and chemical composition of the steel wire should comply with the requirements of Table 3. i number
HgMnsi
H08Mn2Si
H8Mn2SiA
H11Mn2SiA
CB/T 1495894
Chemical dermis, %
0.c35 320.20o.300.20
1. 20 -- 1. 50
G. 4-- 0- 70
1. 70~-2. 10 c. 65-~0. 9s
1. 83~-2. 100. 65-~-(1. 9
1. 60.--1. 50
0. 07~0. 15
o.035t.o35n.20o.30.20
.c300.0300.200.30.20
50.0350.135
01. 65 ~- 0. 05
0. 07.--0. 13
1. 10.-1. 850. 85 ---1. 15
6.2.1 Other brands of steel wire can also be supplied through negotiation between the supplier and the buyer. 6.2.2 The maximum copper content of copper-plated steel shall not exceed 0.50%50.25
F0.150.03
.0-15k c5
6.2.3 If the supplier can guarantee the residual elements of chromium, nickel, steel, pin and other metals in the steel wire, the finished product analysis may not be carried out, and the composition of the smelting analysis shall be indicated in the quality certificate.
6.3 Surface quality of steel wire
6.3.1 The surface of the copper-plated steel wire shall not contain iron oxide scale and pits. Local defects that do not exceed half of the allowable deviation of the straight line are allowed. 6-3.2 The surface of the bundled (salt) copper-plated steel wire shall be smooth and there shall be no visible cracks, pits and corrosion. 6.3.3 The wound copper-plated steel wire shall be clean and free of oil, rust and no coating shedding visible to the naked eye. 6.3.4 The wound steel wire is composed of one piece, and we allow the welding of each wire to be There shall be no more than two joints. The allowable deviation of the diameter of the joint shall comply with the provisions of Table 1. Such wires shall not exceed 10 of the total number of shafts in the batch. 6.4 The slack diameter and warping distance of the winding wire shall comply with the provisions of Table 4. 1
Nominal diameter
Wire shaft bell
Slack diameter
6.4.1 If the purchaser has requirements for the slack point diameter and warping distance of the winding wire, the warping distance must be indicated in the contract
6.5 According to the requirements of the purchaser and the agreement between the supply and demand parties, a mechanical performance test can be carried out in reverse. The results shall be in accordance with the provisions of Table 5. Length 5
HosMus
HIeSMn2StA
I1: 1Mnsi
H11M25iA
7 Test method
Tensile strength
12--320
Conditions and conditions. 2
Length ratio
7.1 Test items, test methods, sampling locations and sampling data of each batch of steel wires shall comply with the requirements of the table. Impact energy kv
Test port
Chemical warfare analysis
Relaxed diameter
Bridge metal impact test
Metal tensile test
GB/T 14958--94
Test method
Test
Measurement with the base H of corresponding accuracy
Measurement with the corresponding increase in the accuracy of other
Measurement with the measuring instrument
G132650
GB2652
7.1.1 Measurement of slack diameter and warping distance of wound steel wire
-Part
Any part
Measure the slack diameter according to Article 3.1
Article 3.2
Appendix R
, which shall be the average of the maximum and minimum diameters of the natural circle. 7.1.1.1
Measured warping distance value shall be the maximum value after the natural circle, 7.1.1. 2
8 Acceptance, packaging, transportation, storage, marking and quality certificate of steel wire 8.1 The acceptance of steel wire shall comply with the relevant provisions of GB2103. 8.2 Packaging, transportation, storage, marking and quality certificate 8.2.1 The packaging of (coiled) steel wire shall comply with the Class 1 provisions of GB2103 8.2.2 The packaging of coiled steel wire shall be moisture-proof and rust-proof and beneficial to storage. 8.2.3 All steel wires to be transported shall not be piled in the open air and shall not be transported during transportation. Rain and moisture-proof measures should be taken during the process. 8.2.4 The quality assurance period of steel wire is generally one year from the date of production. 8.3 Marking and quality certification
The marking and quality certification of steel wire shall comply with the provisions of GB2103. Quantity
3% less (reel, vehicle)
Reel (bundle)
Reel (bundle)
3%F2 axis
3 years old not less than 2 auxiliary
According to 6.5
According to 6.5 tea
A1 The dimensions and allowable deviations of steel wire shafts: GB/T14958-94
Appendix A
Dimensions and allowable deviations of steel wire shafts
(Supplementary)
A1. 1 The drawing of the plastic I-shaped shaft is shown in Figure A1, and the size and allowable deviation are in accordance with Table AI. Figure A Plastic I-shaped shaft
— 3. 1
Auxiliary center distance
A1.2 The drawing of the metal companion shaft is shown in Figure A2, and the size and allowable deviation are in accordance with Table A2. Force
Driving hole
CB/T 14958—94
Figure A2 Metal basket shaft
Note: * The size can be specified without specific requirements. The minimum size after adding the insulating sleeve should be 50.5*mm: n
41.3 After consultation between the supply and demand parties, other types of steel wire shafts can also be used under the condition that the quality of the steel wire wrapped around the shaft is met. Appendix B
Test method of deposited metal
(Supplement)
B1 Chemical analysis of steel wire for molten metal test t
The steel wire chemical analysis sample should be sampled from the steel wire with a true diameter of 1.2mm or 1.6mm, or from the steel wire closest to the diameter of the point. 132 Test of mechanical properties of molten metal
B2.1 The steel wire used for the mechanical properties test of deposited metal is 1.2mm or 1.6mm. or the steel wire closest to this specification, and the test plate is low carbon steel plate.
B2.2 The plate size and test specimen position are shown in Figure B1. 25
Special point test specimen
GB/134958—94
1.2Total length
Test point
Pull test specimen
Figure B1 Test plate size and test time
B2.3 The test plate is first positioned for welding, and deformation should be reversed before welding to prevent angular deformation, and then welding is performed. Welding should start from room temperature (minimum 20C), and the interlayer temperature is 150=15℃. The test plate after correction is not allowed, and the test plate with large angular deformation F5\ should be scrapped. B2.4 The tensile test of molten metal shall be carried out in accordance with the provisions of GB2652, and the test details are shown in Figure 132. R3
Figure B2 Molten metal tensile test specimen
55 + 1. 60
27.5 - (1.3)
CB/T 14958
国国a
10= 0. 05
R U. 5 1 0.025
5\上2
225 ±
Figure B3 Charpy impact test specimen
B2.5 The impact test of metal shall be carried out in accordance with the provisions of GR 2650, and the test specimen is shown in Figure B3. B3 The welding specification for the mechanical property test of deposited metal can be found in B1. E
Shielding gas
Wire feeding speed
Remove voltage
Connection
Distance between electrode and workpiece
Welding speed
Interlayer roughness
(1Product description and product use
150m/515%
27-31 V
260--280A
DC equipment
11-3mn
5. 5 + 1. 5 1r.in/+
15c 1 15 r
Guide to the use of national standards for steel wire for gas shielded welding (reference)
102 mm/s±53
26 ~ 30 V
330--353 A
Complete secretion reverse connectionwwW.bzxz.Net
193 mm
5.3.= 0. 3 1mm/5
150=15℃
C1.1 In the standard, H08Mn.Si, H108Mn2Si, H08.Mn2SiA are the steel wire brands officially used in the standard. IIIMnSiGB/T14958-94
H11Mn2SiA is the steel wire brand recommended by the standard, and users can choose according to their needs. C1.2 The performance of the weld depends largely on the size of the filler metal, welding current, plate thickness, joint geometry, preheating and interlayer temperature, and surface conditions. , chemical composition of base metal, chemical composition of deposited metal, deposition rate, shielding gas. C1.3 When the chemical composition of filler metal is within the range specified in the standard, Ar-O is used as the shielding gas, and the chemical composition of the weld metal will not be much different from that of the filler metal. When CO is used as the shielding gas, manganese, silicon and other deoxidizing elements will be greatly reduced. The reduction of alloying elements when CO is used as the shielding gas will lead to a reduction in the tensile strength and yield strength of the weld, but its value cannot be lower than the minimum value specified in the standard.
C1.4 H08MnSi type: This type of filler metal uses CO, or ArO, as the shielding gas. They are mainly used for single-pass welding; they can also be used for multi-pass welding, especially when welding killed steel or semi-killed vehicles. For small diameter steel wires, when Ar-C () z mixed gas or CO is used as the shielding gas, it can be used for all-position welding or short-circuit type transition. This type of steel wire is used for 100MPa grade components. C1-5H08Mn2Si.H08Mn2SiA type: This type of steel wire is used for 500 MPa grade components, H08Mn2SiA contains more S and P than H08Mn2Si, and can be used for components with higher requirements. The rest are H08MmSi and C1.6H11MnSi: This type of copper wire is mainly used for CO2 gas shielded welding. At the same time, a longer arc or other conditions are used, and more deoxidizers are required than H08MnSi. The tensile strength of the weld metal is higher than that of H08MnSi. No impact performance test is required. C1.7H11Mn2SiA type, this type of steel wire contains the highest total amount of manganese and silicon. Even when welding boiling steel, high flow and CO2 gas shielded welding are used. This type of steel wire can be used to weld metal plates that need to be flat, and steel with a certain degree of rust or secondary iron and phosphorus on the surface. The quality of the weld depends on the degree of surface contamination. This type of steel wire can also be used for all-position welding using short-circuit transition. C2 Droplet Transition Characteristics
C2.1 Gas shielded arc welding can be divided into four types according to the type of metal transition used. These types are jet transfer, pulse jet transfer, particle transfer and short-circuit transfer. When the metal droplets leave the electrode in a stream and particles, it is jet transfer, pulse jet transfer or particle transfer. The metal droplets or particles transfer from the arc gap to the molten pool. In the short-circuit transfer type, the steel wire is pre-shorted to the molten pool and thus melted. C2.2 Spray transfer
C2.2.1 Carbon steel spray transfer welding usually uses Ar and 2%~5% O mixed gas as shielding gas. Spray transfer using argon-oxygen shielding gas is characterized by a soft plasma arc, with hundreds of droplets per second transferring from the steel wire to the molten pool along the arc. However, when using CO shielding gas, unless very high currents are used, there will be no rapid droplet transfer. C2.2.2 When using Ar-CO as shielding gas, axial spray transfer. 1 It is mainly related to the arc current, forgeability and the electric heat of the wire. Above the critical current, a high-speed droplet transfer occurs (about 250 drops per second). This critical current is usually called the conversion current. Below this current, the metal transfers in the form of drops that are usually larger than the diameter of the wire, with a transfer rate of 10 to 20 drops/s (granular transfer). The conversion current depends largely on the wire diameter and chemical composition. For 1.6mm diameter carbon steel wire, the conversion current is usually 270A (DC: wire connected to the positive electrode). AC is not used.
C2.3 Pulse spray transfer
The metal transfers in the form of pulse spray arc welding, which is similar to the spray arc described above, but with a lower average current. The high-frequency pulses formed by the higher current and the lower current make low-current welding possible. At higher currents, the metal transfers in the form of a spray, and at lower currents, the metal does not transfer. At a typical rate of 60 to 120 pulses/s, droplets are formed in a low current arc and then "emitted" by a high current pulse. This type allows full-position hydroxyl welding as described in the short-circuit transition form below. C2.4 Granular transition
This type of welding uses CO as the shielding gas and is characterized by full molten metal in a granular and non-axial transition. Usually, a low arc voltage is used to form a "submerged arc" to produce deep penetration and reduce spatter. For this type of transition, 1.2 and 1.6 mm diameter steel wires are generally used, and the welding current is in the range of 275~400A (DC). The droplet (granular) transfer rate is 2~71 drops/, depending on the wire, welding current and voltage
C2.5 Short-circuit transition
This method usually uses a wire diameter of 0. 8~1.2 tt1,Use lower arc voltage and current than spray arc welding, and the power supply is short-circuit GB/T 1495894
transition type. The steel wire is usually short-circuited with the workpiece at a rate of 50 to 200 times/. The metal transitions at each short circuit without passing through the arc. Short-circuit gas metal arc welding of carbon saws usually uses Ar-CO2 gas mixture or 100% welding grade CO2. When CO2 shielding gas is used, the weld penetration is greater than when Ar-CO2 mixed gas is used. The shielding gas mixture composed of 50%-80% Ar CO2 produces a higher short-circuit frequency and lower minimum current and voltage than CO2 gas shielding, which is conducive to welding thin plates. Additional remarks:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard is under the jurisdiction of the Information Standards Research Institute of the Ministry of Metallurgy. This standard was drafted by Tianjin Welding Wire Factory and the Iron and Steel Research Institute of the Ministry of Metallurgy. The main drafters of this standard are Li Rong, Xu Zuze, Chen Zhiju, Peng Yun, and Feng Wenhua. This standard level mark GB/T 14958-94 J
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