| abstract |
Patent Specification: "Welded tin body, welded tin, method for making welded tin body and method for making welded tin". The present invention relates to a welded tin body which is formed by forming a sheet steel material formed of a tin-free steel sheet or a resin-coated steel sheet, wherein a tin-free steel sheet It is coated with a resin which overlaps corresponding parts and which forms a welded part by welding the strength of the overlapping parts. laser processing parts, which are formed on at least one of four surfaces composed of two surfaces that constitute electrode contact surfaces on sides that come into contact with an electrode (a) during resistance welding and two surfaces that constitute Joining surfaces on sides to which this sheet steel material is bonded have laser irradiation parts, where laser irradiation is performed before resistance welding eliminates chrome plating and exposes the separately disposed steel sheet. into parts to be welded (12), which shall become the welded parts, in the sheet steel material. |