| 摘要 |
PURPOSE:To permit supplying of voltage with which immediate welding is possible in TIG welding as well by providing an error amplifier which amplifies the difference between a feedback output and a reference output and outputs an control signal to a control circuit, a comparator for the output control circuit and the wave from a normally operating saw tooth wave generator, a starting signal generator which receives and outputs a welding start signal, and a switching circuit which receives the starting signal and outputs the output control signal to the comparator. CONSTITUTION:A starting signal generator 11 is turned off and a switching circuit 12 is turned on. A saw tooth wave generator 9 is under oscillation, but since a switching circuit 12 is on, the actuation of a driving signal generator 10 by a comparator 8 is prohibited, and the output of an electric power source for arc welding is 0. In the stage of starting of welding, a starting signal generator 11 emits a starting signal on receiving of the welding start signal. Then, the circuit 12 goes off, and immediately the comparator 8 starts outputting the output control signal. Thus a switching circuit 2 operates immediately and voltage is supplied to load 5. |
