PURPOSE: To execute the welding working with high quality and reliability by calculating a wire projecting length with a functional formula making an average welding current, a wire feeding velocity and an average welding voltage between a chip and a base material as variables.
CONSTITUTION: An average welding current is obtained by an average welding current detecting circuit 12 and inputted to an arithmetic circuit 15. A wire feeding velocity is obtained with a wire feeding velocity detecting circuit 12 and inputted to the arithmetic circuit 15. An average welding voltage between a chip 3 and a base material 6 is obtained by a voltage between chip and base material detecting circuit 14 and inputted to the arithmetic circuit 15. The arithmetic circuit 15 calculates the inputted data by the prescribed linear expression, obtains the wire projecting length from the top end of chip 3 to the top end of wire 4, and informs an operator of the length by an annunciator 18. Thereby, the operator can work so as to keep the wire projecting length constant.
MITA TSUNEO
TAGAMI HIROSHI
FUJIWARA KIROKU
HANEDA MITSUAKI
