RESISTANCE-WELDING METHOD FOR HIGH STRENGTH STEEL SHEET

To solve such a problem that crack sensitivity increases due to HAZ softening in resistance-welding of a high strength steel sheet 3 of which a tensile strength exceeds 1 GPa.SOLUTION: According to this method, a heat treatment process, in which a part of a high strength steel sheet 3 to be welded t...

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Bibliographische Detailangaben
1. Verfasser:	MURAKAMI AKIYOSHI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Zusammenfassung:	To solve such a problem that crack sensitivity increases due to HAZ softening in resistance-welding of a high strength steel sheet 3 of which a tensile strength exceeds 1 GPa.SOLUTION: According to this method, a heat treatment process, in which a part of a high strength steel sheet 3 to be welded to other steel sheet and surroundings thereof are pinched by a pair of heating electrodes and are electrically conducted while being heated to generate heat thereby increasing ductility, is performed on the high strength steel sheet alone. and thereafter, the high strength steel sheet 3 is overlapped with other steel sheet, and a weld nugget is formed between those steel sheets by pressurized electric conduction with a pair of welding electrodes.SELECTED DRAWING: Figure 1 【課題】引張強度が１ＧＰａを超える強度を有する高強度鋼板３の抵抗溶接において、ＨＡＺ軟化によって割れ感受性が高くなる問題を解決する。【解決手段】高強度鋼板３における他の鋼板と溶接すべき部位及びそのまわりを一対の加熱用電極によって挟み、加圧しながら通電することによって発熱させて延性を増大させる熱処理工程を高強度鋼板単独で行ない、しかる後に、この高強度鋼板３を他の鋼板と重ね、一対の溶接用電極による加圧通電によって当該鋼板間に溶接ナゲットを形成する。【選択図】図１