| 摘要 |
PROBLEM TO BE SOLVED: To keep the excellent welding quality by estimating the gap of a welding starting part from the difference between the welding current in the elapse of the prescribed time after the welding is started, and the preset welding current to the standard gap, or from the reduction ratio of the welding current. SOLUTION: The target position of a welding torch is set to the prescribed position through a wire touch sensing, etc. That means,ΔX=0 for a fillet welding root part. Then, the initial welding condition, i.e., the feeding speed of the welding wire 2 and the welding power source output terminal voltage are set to detect the welding current Is in the prescribed time (a short time of about 0.5-2 seconds) after the welding is started, is detected. The differenceΔIs=Io-Is between the preset welding current Io to the standard gap G and the detected welding current is obtained, and the gap G, at the welding start position is estimated according toΔIs. The differenceΔGs between the gap G and Gs is obtained, and the welding condition is controlled according toΔGs. The welding current reduction ration may be used in place ofΔIs.
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