| 摘要 |
PURPOSE:To exactly measure the position of the weld zone of a base metal by moving a tip end vertically or horizontally to the base metal while a welding wire is held retracted from the tip at the top end of a torch nozzle and measuring the moving distance thereof. CONSTITUTION:Since the length of the wire projecting from the tip is not fixed, the position of the contact point 4a of the weld zone 4 is detected not with said length as a reference but with the torch nozzle 5 as a reference. More specifically, the wire is held retracted into the tip 7 and the torch nozzle 5 is moved in this state from the vertical state to the vertical direction and horizontal direction. The moving distance (h) until the top end of the tip 7 contacts a lower plate 2 of the base metal 1 and the moving distance (l) until the side face of the nozzle 8 contacts the upper plate 3 are measured. The position of the contact point 4a is determined from the distance (h), (l). The contact of the torch nozzle 5 and the base metal 1 is electrically measured by a touch sensor power source and the distances (h), (l) are measured by making use of the short circuit state which arises therebetween.
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