| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that, when the distance between a remote control machine and a welding power source is increased, the impedance of a connection wire becomes high, the noise is superposed on the starting signal or the like from the outside, and abnormal stop of the welding power source may occur. SOLUTION: In an arc welding apparatus having a welding power source, a remote control machine, a wire feeding machine and a welding torch, the remote control machine comprises two clamp circuits for clamping the positive or negative AC voltage from an inching switch and the welding power source to the remote control machine, two conversion circuits for converting the welding voltage set value and the wire feed amount set value to the current, and a current command changing circuit for outputting the two current signals at every semi-period of the positive or negative AC voltage; and the welding power source comprises an AC voltage generation circuit, a start discrimination circuit for starting the welding power source or the like when the positive AC voltage is clamped, an inching discrimination circuit for starting the wire feeding machine when the negative AC voltage is clamped, and a command signal generation circuit in which the current command changing signal is set to be the welding voltage command signal during the semi-period of the positive AC voltage, and set to be the wire feed amount command signal during the semi-period of the negative AC voltage. COPYRIGHT: (C)2009,JPO&INPIT
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