Low-carbon high-copper high-strength welding wire for gas protection welding

A gas protection, high-strength technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of poor crack resistance of high-strength steel weld metal, reduce the carbon equivalent of weld metal, etc., to improve the resistance Cold cracking performance, effect of welding arc concentration

Inactive Publication Date: 2013-03-13
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a low-carbon, high-copper, high-strength gas-shielded welding wire, which belongs to the low-carbon, high-copper gas-shielded welding wire, and solves the problem of poor crack resistance of the weld metal of high-strength steel; In case of change, less than 0.075 wt% C and 0.5-0.8 wt% Cu are used to r

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Embodiment Construction

[0013] Below in conjunction with embodiment this patent is further explained and illustrated.

[0014] Within the composition range of the low-carbon, high-copper-content, and high-strength gas-shielded welding wire of the present invention, a total of 5 furnaces of welding wire were smelted, and the composition of the welding wire is shown in Table 1. After the welding wire is welded by MIG, the mechanical properties of the deposited metal are shown in Table 2. The deposited metal structure of the welding wire is a mixed structure of acicular ferrite and bainite, and the structure contains a small amount of dispersed retained austenite.

[0015] Table 1 Chemical composition of welding wire

[0016]

[0017] Table 2 Mechanical properties of deposited metal

[0018] Example Rp 0.2 , MPa Rm, MPa A，% Z，% -50℃ KV 2 , J Example 1 805 855 19 60.5 75,80,80 / 78 Example 2 815 850 18.5 64.5 82,58,56 / 65 Example 3 815 860 16.5 64.5 92,9...

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Abstract

The invention discloses a low-carbon high-copper high-strength welding wire for gas protection welding, wherein the components of the welding wire are as follows: 0.04 to 0.07 wt% of C, 0.35 to 0.6 wt% of Si, 0.7 to 1.0 wt% of Mn, 0.45 to 0.7 wt% of Cr, 2.0 to 2.4 wt% of Ni, 0.40 to 0.60 wt% of Mo, 0.50 to 0.8 wt% of Cu, 0.01 to 0.05 wt% of Ti, the balance of Fe and inevitable impurities. With the adoption of the welding wire for the gas protection welding provided by the invention, when the MIG (Metal Inert-gas Welding) welding is adopted, the welding arc is concentrated and stable; a weld microstructure is a mixed microstructure of low-carbon equivalent acicular ferrite and bainite; a little dispersive retained austenite exists in the microstructure, thus being beneficial to the improvement of cold cracking resistance performance of weld metal; and in addition, the yield strength of deposited metal is more than 735MPa and the ballistic work is more than 60J at the temperature of -50 DEG C.

Description

technical field [0001] The invention relates to a welding material, in particular to a low-carbon, high-copper, high-strength gas-shielded welding wire. Background technique [0002] The MIG welding method is the first choice for welding high-strength steels with a yield strength greater than 700MPa. Usually, MnNiCrMo welding wires with (2-3) wt% Ni content are used together. The typical representatives are MIL120S and MIL130S welding wires in the US military standard MIL-E-23765-2E . The advantages of this type of welding wire are: its alloy system has been widely used and verified, its weld structure is a medium temperature transformation structure, contains more acicular ferrite, and the weld metal has excellent strength, plasticity and toughness; but there are also the following Disadvantages: (1) Alloying elements such as Si, Mn, Ni, Cr, and Mo must be added to the welding wire to meet the requirements of high strength. It can be seen from the CEN carbon equivalent for...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 张京海杜义
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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