PURPOSE: To provide an excellent welding part even by a beginner by composing so as to store a functional expression by making a reference value of an arc length, 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 from the output of a shunt 7 with an average welding current detecting circuit 12 and inputted to an arithmetic circuit 15. A counter electromotive force of a wire feeding motor 10 is made as a wire feeding velocity with a wire feeding velocity detecting circuit 13 and inputted to the arithmetic circuit 15. An average welding voltage between a chip 3 and a base material 6 is inputted to the arithmetic circuit 15 with a voltage between chip and base material detecting circuit 14. In every definite period, the arc length and a wire projecting length are computed with the arithmetic circuit 15, and the difference between a standard value is obtained. The result is reported to an operator with an annunciator 19. The operator changes the torch length following to the display of the annunciator 19, and the arc length or the wire projecting length can be kept right.
MITA TSUNEO
TAGAMI HIROSHI
FUJIWARA KIROKU
HANEDA MITSUAKI
