| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of the short circuit of electrodes and the phenomenon of an excessive arc length by monitoring the variation in voltage of two electrodes simultaneously. SOLUTION: A variation from the set electric power of the two electrodes in a TIG welding torch 10 is determined by a first and a second variation measuring apparatus 20a, 20b. Both variations are added by an adder 21 and, if the sum is in excess of a tolerance, a correction is calculated by multiplying a correction constant by a correcting device 22. With the correction value sent to an operation command device 18, a torch moving unit 17 is driven, making the TIG welding torch 10 close to or separate from the base material, thereby holding the arc length properly.
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