Welding method and welding structure of metal members

Abstract

A welding method and a welding structure of metal members are provided to prevent the zinc vapor generated during arc welding from remaining in the molten metal of the core wire and the base material (steel plate), thereby suppressing the generation of pores and pits in the welded portion. There are provided a first step of bending adjacent portions of first and second metal members(11,12) in the same direction and forming a flange overlapping part(15) where respective flange portions(13,14) of the first and second metal members are overlapped and contact each other, a second step of starting to perform arc welding from a tip of the flange overlapping part(15), and a third step of continuing to perform the arc welding until molten metal(19) of a core wire and a base material reaches an opposite-side face of the flange overlapping part(15) and zinc gas generated is emitted from a side opposite to an arc-welding performance side of the flange overlapping part.

Description

technical field [0001] The present invention relates to a metal member welding method and welding structure for arc welding a first metal member made of galvanized steel sheet and a second metal member made of galvanized steel sheet adjacent to the first metal member. Background technique [0002] In general, galvanized steel sheets galvanized on the surface of steel sheets for rust prevention are used for vehicle parts such as suspension beams, lower arms, upper arms, and shock absorbers, as well as home appliances such as air-conditioning boxes and building materials. [0003] When two members made of galvanized steel sheets are joined by arc welding, zinc adhering to the surface of the steel sheets evaporates before the steel sheets are melted due to the heat of the arc. That is to say, the boiling point of zinc is lower at 906°C than the melting point of iron at 1539±3°C, so zinc evaporates before the steel plate melts, and zinc vapor enters between the core wire such as...

AI Technical Summary

Problems solved by technology

[0009] In this patent document 2, when the material of the top plate 91 and the side plate 92 is replaced by a galvanized steel sheet from stainless steel, similar to the above, zinc vapor generated during arc welding remains in the molten metal, so that the welding part cannot be suppressed. The porosity and pockmark generation in 94

[0010] In addition, the conventional structure disclosed in the above-mentioned Patent Document 2 is a so-called edge weld (bend a steel plate into a flange shape, and weld the end surface thereof), and does not suggest the technical idea of ​​the present invention.

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