| 摘要 |
PURPOSE:To obtain good bead shapes with good reproducibility by making automatic setting and controlling to correct arc current value and feed speed of a wire possible by setting the thickness of base materials and a welding speed. CONSTITUTION:When the thickness of a base material and a welding speed are set with a setter 36, arc current is set with a function generating circuit 38, and is converted to the signal corresponding to the feed speed of a wire with a function generating circuit 40. The set value and the detected arc current are compared in a comparator 42, and on and off of a switching element is controlled The converted output of the circuit 40 is applied to a motor 60 for driving of a wire, and is inputted together with the output of a current detector 48 for heating of the wire to a comparator 52, by which an on and off of the switching element 56 is controlled. By the above-mentioned operations, heating current is run to a wire 16 so as to melt the same just on the surface of base material 26 in conformity with the feed speed. The necessary arc current from which the current for heating of the wire is deducted is supplied by the on-off operations of the element 46. |
