ER50-G non-copperizing welding wire

Abstract

The invention discloses an ER50-G non-copperizing welding wire. The welding wire comprises, by mass, 0.03%-0.10% of C, 0.90%-2.00% of Mn, 0.3%-1.15% of Si, 0-0.010% of S, 0.010%-0.30% of P, 0.10%-0.25% of Cr, 0.30%-0.50% of Cu, and the balance Fe. The ER50-G non-copperizing welding wire is characterized by further including 0.60%-1.20% of Ni, 0.20%-0.60% of Mo, 0.02%-0.08% of Ti and 0.001%-0.008% of B. The welding wire has good atmospheric corrosion resistance and good welding performance, due to the fact that no copper plating is required in the welding wire, production cost can be greatly reduced, and unexpected and considerable economic and social benefits are brought about to enterprises.

Description

technical field [0001] The invention relates to a welding material, in particular to an ER50-G copper-free welding wire. Background technique [0002] ER50-G is a series of carbon steel and low alloy steel welding wires for gas shielded arc welding. The national standard GB / T8110-2008 carbon steel and low alloy steel welding wires for gas shielded arc welding stipulates that ER50-G has 5 different chemical Composition, as shown in Table 1, unit (%): [0003] [0004] Table 1 [0005] GB / T 8110-2008 has the following regulations: [0006] 1. If the welding wire is copper-plated, the sum of the copper content in the welding wire and the copper content in the copper plating layer should not exceed 0.5%; [0007] 2. Manganese can exceed 2.0%, but for every 0.05% increase in manganese, the maximum carbon content should be reduced by 0.01%; [0008] 3. Nb (Cb) 0.02-0.10%, N 20.03-0.07%, (Mn+Ni) ≤ 1.50%; [0009] 4. The single values ​​in the table are the maximum value. ...

AI Technical Summary

Problems solved by technology

[0017] (1) The copper plating layer is softer than the surface of the welding wire. Due to the friction between the welding wire and the welding tip, the copper plating is inevitably peeled off from the welding wire surface, and the copper scraps fall off in the conductive tip, which will induce clogging and increase welding instability. prone to splashing;

[0018] (2) The melting point of copper is low, which is 1083°C, and it is easy to evaporate under the ultra-high temperature of the welding arc, resulting in a large amount of copper fume

[0019] (3) Copper plating waste liquid will seriously pollute the environment

Moreover, since it is difficult to control the coated powder at an appropriate level, the powder coated on the wire surface is not uniform, thereby increasing the amount of spatter

[0023] For ER50-G, there is no copper-plated welding wire with no surface coating at present, so it is urgent to develop a copper-free ER50-G welding wire with no coating surface

Images