Abstract: Positions of predetermined spots in a frame of a motorcycle are determined by sensing all the predetermined spots in one direction from a front side or a rear side of the frame of the motorcycle by a sensing device.

Abstract: TIG welding equipment includes a first articulate robot having a first arm, a TIG torch holding member for holding a TIG torch at a specified position so that the TIG torch can perform a weaving operation, and a filler wire guide moving member formed so as to surround the TM torch holding member and holdingly moving a filler wire guide in Z-axis direction.

Abstract: TIG welding equipment, comprising a first articulate robot having a first arm, a TIG torch holding means holding a TIG torch at a specified position so that the TIG torch can perform a weaving operation, and a filler wire guide moving means formed so as to surround the TIG torch holding means and holdingly moving a filler wire guide in Z-axis direction.

Abstract: The invention relates to a laser beam welding method for carbon steels applied to laser beam welding of carbon steels of different carbon content, and in order to improve uniformity of fused metal in the welded region, a laser beam is applied obliquely to the joint region between the carbon steels from the side of the carbon steel having the lower carbon content. When manufacturing a vehicle wheel 1 by this method, the laser beam is applied obliquely from the side of the hub 3 of rolled steel plate which contains about 0.1% of carbon to the joint region with the boss 2 of carbon steel for machine structural use which contains about 2% of carbon so as to fuse the end of the hub 3 and cause it to penetrate into the welded region.