Solid welding wire

Abstract

The present invention relates to a solid cored welding wire, which is arranged with a cementite layer on the surface. The cementite layer contains 0.005% to 0.10% carbon by weight of the whole welding wire and below 0.010% oxygen by weight of the whole welding wire. Getting rid of the cementite layer, the welding wire contains carbon: 0.005% to 0.150% by weight, Si: 0.4% to 1.2% by weight, Mn: 1.0% to 2.2% by weight, the other components is Fe and inevitable impurity. The solid cored welding wire can ensure the welding dripping be transition stable and reduces splash occurring amount when implementing gas protecting arc welding with high current using CO2 as protecting gas.

Description

technical field [0001] The present invention relates to a solid welding wire, in particular to a solid welding wire for gas-shielded arc welding which has excellent droplet transition properties and generates less spatter during welding at high current. Background technique [0002] Conventionally, as a welding wire for gas-shielded arc welding, a welding wire with a copper-plated surface has been mainly used. Since the surface of the welding wire is copper-plated, the conductivity of the welding wire is good. Copper burrs occur in the wire feeding system, and there is a problem of making wire feeding difficult. Additionally, the CO 2 When using as a shielding gas and welding at a relatively high current, the copper-plated welding wire, especially when using YGW11 according to JIS Z3312, increases the amount of spatter during transitional unstable welding where there are droplets of the welding wire. Such problematic points. [0003] In order to solve this problem, the f...

AI Technical Summary

Problems solved by technology

Using the welding wire under the technical support disclosed in the special publication No. 59-13956 and the special publication No. 59-13957 still cannot reduce the use of CO 2 The amount of spatter generated during high-current welding where the gas is used as the shielding gas

[0008] In addition, the technology disclosed in JP-A-7-40081 does not study the possibility of high-concentration oxygen being attached to the surface of the welding wire accompanying the carburizing treatment.

If the oxygen concentration on the wire surface increases with the carburization of the wire surface, the surface tension of the droplet will decrease as a result, so the droplet will become unstable, and there is a problem that the amount of spatter cannot be sufficiently reduced.

[0009] In addition, the problem with the technology disclosed in JP-A-2000-141080 is that, in order to coat only the surface of the wire with C, it is impossible to reduce the surface tension of the droplet during welding and reduce the amount of spatter generated. get enough C

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