| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate a restriction in use in an arc welding apparatus by using no control signal cables and to solve the problem that malfunction is generated by a high frequency noise occurring during welding.SOLUTION: A value of a weld output adjuster is converted into a carrier frequency signal so as to transmit an output adjustment signal of an arc-welding power source from the controller side near a welding torch to the arc-welding power source side by using two kinds of carrier waves, so that this frequency signal is sent to the arc-welding power source side by FSK modulation. The arc-welding power source side extracts the original frequency signal by demodulating only signals carried by the two kinds of carrier waves to serve as a voltage signal which adjusts an output in a frequency/voltage conversion circuit, thereby adjusting the output of a welding machine. A welding output adjustment signal is made to be received only when the signals carried by the two kinds of carrier waves are received simultaneously, thereby distinguishing a high frequency noise and a necessary output adjustment signal.</p> |
