METHOD OF LASER WELDING METAL PLATED PLATE

PROBLEM TO BE SOLVED: To provide a method of laser welding zinc plated steel plates which surely achieves excellent welding without a melting defect such as blowholes. SOLUTION: By irradiating a line K1 on a superposed portion of a lower plate 11 and an upper plate 12 with a first laser beam 18a hav...

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Bibliographische Detailangaben
Hauptverfasser:	SHIMIZU TAICHI, OKU YOSHIHIRO, KAWAMATA KENICHI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DEVICES USING STIMULATED EMISSION ELECTRICITY 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:	PROBLEM TO BE SOLVED: To provide a method of laser welding zinc plated steel plates which surely achieves excellent welding without a melting defect such as blowholes. SOLUTION: By irradiating a line K1 on a superposed portion of a lower plate 11 and an upper plate 12 with a first laser beam 18a having a high energy density and a small irradiation region 19a by moving the first laser beam 18a therealong, steel plate portions in the small irradiation region 19a are melted and zinc on the superposed surfaces around the small irradiation region 19a including in the small irradiation region 19a is evaporated and allowed to escape outside. Then, after the irradiation with first laser beam 18a, the same line K1 is irradiated with a second laser beam 18b having a lower energy density than the first laser beam 18a and a larger irradiation region 19b than the first laser beam 18a by moving the second laser beam 18b therealong to melt steel plate portions in the larger irradiation region 19b, thereby completing welding and bonding. COPYRIGHT: (C)2010,JPO&INPIT