| 摘要 |
PURPOSE:To reduce the upset quantity without generating a welding defect, and to improve the joint performance by executing a heat input control by a control variable containing a laser beam input which is projected to a welding point, and a high frequency welding power which is supplied to an object to be welded. CONSTITUTION:A wedge shape whose top is a welding point is formed by edges 2, 2 of an object to the welding 1 approach gradually. To the object to be welding 1 in the vicinity of said welding point, a welding power is supplied through a contact 4 from a high frequency seam welding machine 5. At the same time, to said welding point, a laser beam LB is irradiated through a beam shape controller 7 and a beam guide 8 from a laser oscillator 6. By Joule heat and a laser beam energy which are generated thereby, the welding point is heated to a welding temperature, and by welding with pressure by a squeeze roller 3, seam welding is executed. In said method, a heat input controll is executed by setting PE+alphaPL (PE; a high frequency welding power, 2<=alpha<=15, PL; an input of a laser beam) as a control variable. As for said control variable, it is also possible to add a welding speed and/or a plate thickness of the object to be welded 1 to PE+alphaPL. |
