| 摘要 |
PURPOSE:To easily perform an automatic welding of high degrees by operating the intermediate value of the minimum values of both welding currents in an oscillation and reversing the oscillation direction at the time when the welding current detection value becomes equal to the value that the prescribed current value is added to the intermediate value. CONSTITUTION:When a welding torch 3 is oscillated up to the position set by the right end position setting circuit with its advance to the right, the position proportionate voltage outputted by an oscillation position detector 8 becomes equal to the set voltage of the right end position setting circuit, which transmits the right end position detection signal. A polarity reversal command circuit gives a polarity changing command to a motor driving circuit. A motor 5 thus drives an oscillator 6 for the direction the welding torch 3 advances to the left. With the torch 3 starting its advance to the left a current minimum value holding circuit reads a welding current detection signal and holds by detecting the current minimum value in the left advance stage of the torch 3. The left advance of the torch 3 is progressed and when the torch 3 is oscillated up to the position set by the left end position setting circuit, the left end detection circuit transmits the left end position detection signal. |
