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Research and Development > Â鶹ÊÓƵ TECHNICAL REPORT >Â鶹ÊÓƵ TECHNICAL REPORT No.20 March 2015 - Special Issue on “Steel Plates” and “Welding and Joining” > Application of Laser Welding Technologies to Automotive Bodies

No.20 March 2015 - Special Issue on “Steel Plates” and “Welding and Joining”

Application of Laser Welding Technologies to Automotive Bodies

KITANI Yasushi      OI Kenji     TAMAI Yoshikiyo

Abstract

The application of remote laser welding to the high tensile steel sheet lap joint and the rigidity improvement of the frame parts by application of continuous welding were introduced. In the lap welding of 980 MPa grade steel sheet, the remote laser welded joints showed higher cross tensile strength than the resistance spot welded joints. The remote laser welding, which allowed easier control of the weld size, had an advantage for the improvement of peel strength. As a result of torsional rigidity test of the hat shape test pieces whose fringes were welded by resistance spot welding, laser welding and laser-arc hybrid welding, laser and laser-arc hybrid welding as continuous welding provided the higher rigidity. Further changing welding position from the fringe center to the corner end and the inside corner led to improve the rigidity.

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