SPOT WELDING METHOD FOR ULTRA-HIGH STRENGTH STEEL SHEET

The present invention relates to a spot welding method for an ultrahigh-strength steel sheet with a tensile strength of 800 Mpa or greater comprising the steps of: conducting a primary power passage on a spot region for welding of the ultrahigh-strength steel sheet; cooling the spot region by cuttin...

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Bibliographische Detailangaben
Hauptverfasser:	CHOI, DU YOUL, SON, WON QEUN
Format:	Patent
Sprache:	eng ; kor
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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Beschreibung
Zusammenfassung:	The present invention relates to a spot welding method for an ultrahigh-strength steel sheet with a tensile strength of 800 Mpa or greater comprising the steps of: conducting a primary power passage on a spot region for welding of the ultrahigh-strength steel sheet; cooling the spot region by cutting off an electric current for a time proportionate to the thickness of the ultrahigh-strength steel sheet; and conducting a secondary power passage with the magnitude of an electric current proportionate to the magnitude of the electric current of the primary power passage for a time proportionate to the time for cutting off the electric current to the spot region. 본 발명은 인장강도 800Mpa 이상의 초고강도 강판을 스폿 용접하는 방법에 있어서, 상기 초고강도 강판의 용접하고자 하는 스폿 부위에 1 차 통전을 실시하는 단계; 상기 초고강도 강판의 두께에 비례하는 시간 동안 전류를 차단하여 상기 스폿 부위를 냉각하는 단계; 및 상기 스폿 부위에 상기 전류를 차단한 시간에 비례하는 시간 동안 1 차 통전의 전류의 크기에 비례하는 전류의 크기로 2 차 통전을 실시하는 단계를 포함하는 초고강도 강판의 스폿 용접 방법을 제공한다.