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AssigneeFanuc Corporation
InventorsNorio Karube, Yoshinori Nakata, Atsushi Mori, Etsuo Yamazaki
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Surface-treated metallic workpieces such as zinc-plated steel plates are welded with high quality while they are being held in intimate contact with each other. An auxiliary gas including an oxygen gas is ejected from a space (7) around an electrode (1) through a nozzle (8) to a welding point (9) on overlapping surface-treated metallic workpieces such as zinc-plated steel plates (3a, 3b). When the zinc-plated steel plates (3a, 3b) are welded in the atmosphere of the auxiliary gas, the surface layers of zinc and oxygen react with each other, producing a solid oxide such as zinc oxide or zinc peroxide. Therefore, a gas such as a zinc vapor is prevented from being produced between the overlapping zinc-plated steel plates (3a, 3b). The welded joint is of high quality without blowholes which would otherwise blow away molten steel.
A method of welding surface-treated metallic workpieces each comprising a base material coated with a material whose evaporation temperature is lower than the melting temperature of the base material, according to one of a gas-shielded arc welding and a plasma welding process, said method comprising the steps of:
A method of welding surface-treated metallic workpieces each comprising a base material coated with a plated layer of material whose evaporation temperature is lower than the melting temperature of the base material, according to one of a gas-shielded arc welding and a plasma welding process, said method comprising the step of:
Dependencies are inferred from the claim text.