| 摘要 |
PURPOSE:To eliminate the need for electric power sources for detection and selecting switches and to obtain good detecting sensitivity by making combination use of an electric power source for welding for detecting of weld points as well and controlling the output current of the power source for welding to at least the current at which a welding wire does not melt. CONSTITUTION:A circuit 10 outputs the data for moving a torch 14 downward in a Z-axis direction to a robot body, and outputs a current command for detection of welding points and a stop command signal for wire feeding to a circuit 11 via a circuit 15. Then, the robot body controls the axis for the downward movement of the torch and the circuit 11 controls an electric power source 12 so as to make the voltage applying to the wire 17 high and the current flowing to the wire 17 small. This current value is set within the range where the wire is not melted. The circuit 11 further stops the output of the wire feed command signal to a motor 16 and maintains the wire length at the preceding end of the torch at a prescribed length. If there is contact or discharge between the wire and a base metal 19 on controlling of the torch axis, the downward movement of the torch is stopped by the detection of the change in the current value of a detector 13, and the circuit 10 takes the data on the torch position therein. The similar operations are performed with respect to an X-axis and the position data is calculated. |
