| 摘要 |
PURPOSE: To provide a method in which equipment for welding a billet may be miniaturized and simplified and in which a billet may be tack-welded at high speed. CONSTITUTION: In a billet welding method by abutting the rear end of a preceding billet on the tip end of a succeeding billet, tack-welding the abutting part with a laser beam and successively pressure-welding it, in manufacturing a hot rolled sheet or belt by continuously hot rolling plural billets; the laser beam is scanned along the abutting line at the time of laser welding and also vibrated vertically to the abutting line at the following average speed: 1<=V/(v)<=2, 5<=V<=20, assuming V: scanning speed (m/min) of the laser beam in the direction of the abutting line and (v): average speed (m/min) of the laser beam in the vibrating direction. |
