| 摘要 |
PROBLEM TO BE SOLVED: To make unmanned welding work by adjusting a torch position in a groove based on an arc voltage deviation value when a torch is stopped at outward route left/right both ends and adjusting a torch up/down position to that a return route arc voltage is within a set voltage range producing a prescribed arc length. SOLUTION: An electrode block 9 is oscillated during welding, a tungsten electrode 10 tip mounted with inclination is reciprocated left/right. At this time, the electrode 10 is moved to left side and is reached to a set oscillation angleθL, based on an arc average voltage VL in a stop period and an arc average voltage VR at a right side oscillation angleθR,ΔVS=VL-VR is calculated. When the electrode 10 is subsequently moved from left side to right side, in the case ofΔVS<0, a torch is adjusted by a set value to right side, in the case ofΔVS>0, to left side, further, an arc voltage VS in moving the electrode 10 is measured, a differenceΔVA with a reference voltage VC as a set arc length is obtained, in the case ofΔVA<0, the torch is moved downward, or in the case ofΔVA>0, the torch is moved upward, by repeating these controls, control precision is improved.
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