| 摘要 |
It is made possible to position plate members to be butt-welded for formation of weld line in a small amount of time so as to enhance working capacity of butt welding. Plate members 17 are respectively rested on first and second tables 1 A and 1 B relatively movable toward and away from each other. The plate members 17 are caused to abut against reference positioning members 16 a and 16 b of reference positioning devices protruded ahead of and over opposing ends 1 ' of the tables 1 A and 1 B so that opposing ends of the plate members 17 are positioned in protrusion ahead of the opposing ends 1 ' of the tables 1 A and 1 B, and the plate members 17 are positioned laterally. Then, the positioned plate members 17 are locked on the tables 1 A and 1 B. After the reference positioning devices are retracted, the tables 1 A and 1 B are relatively moved toward each other to cause the opposing ends of the plate members 17 to abut together for formation of weld line X.
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