PURPOSE:To facilitate a setting and to perform a sure profiling without any fear of vibration by hanging a welding machine with a wire and by attracting it to a steel plate by a magnet roller. CONSTITUTION:A welding machine 40 is suspended by two wires 42, 44. The tip of the wire 42, 44 is locked to the hanger 48 placed in a bridge shape on the upper edge of the steel plate crossing in T shape, and the other end is wound and fixed to the winding drum 46 fitted to the truck member 74 of the welding machine 40. The winding drum 46 is rotated by a motor 54 via worm gear mechanism 50 and gear 52, the welding machine 40 is ascended as the wires 42, 44 are wound on the winding drum 46 and a weld line 14 is subjected to a vertical up fillet welding by a torch 56. Magnet rollers 58a-58d are fitted at the right and left, before and behind on the truck member 74 of the welding machine 40, and the profiling roller 60a which rolls on the weld line is fitted on the center of the truck member. The wires 42, 44 are wound by starting the contact from the non-steel plate side of the winding drum 46 and with these the welding machine 40 is pushed to the steel plate side, travelling by profiling to the weld line 14.
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