JOINING METHOD FOR ULTRAHIGH STRENGTH STEEL SHEET SLIT COILS

PURPOSE:To soften a welded joint part and to avoid a notched state due to high strength by performing heating before and after welding of ultrahigh strength steel sheet slit coils. CONSTITUTION:The tip and a rear end to be joined of a preceding coil 1 and a succeeding coil 2 are heated above A3 poin...

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Bibliographische Detailangaben
Hauptverfasser:	SUGIMOTO YUJI, SUGAMASA TETSUAKI, OWAKI JOJI, SATO YUJI, TAKAMURA TOSHIHIRO, TAKAGI HIROMI
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MACHINE TOOLS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PURPOSE:To soften a welded joint part and to avoid a notched state due to high strength by performing heating before and after welding of ultrahigh strength steel sheet slit coils. CONSTITUTION:The tip and a rear end to be joined of a preceding coil 1 and a succeeding coil 2 are heated above A3 point. Heated parts 1a and 2a are then cut by a crop shear to form 1c and 2c. Regular welding 3 on each cut end part of both coils 1 and 2 is performed. A HAZ part by this regular welding is again heated above A3 point. A partial high hardness part in the vicinity of the joint part is completly eliminated by this stage and stable and efficient resistance welding is made possible.