Pulse arc welding apparatus

Details Pulse arc welding apparatus Pulse arc welding apparatus

1998-03-24

2000-04-18

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913033, B23K 909

Patent

active

060518073

ABSTRACT:
A pulse arc welding apparatus feeds a consumable electrode with a constant rate, and arc-welds by applying a welding current constituted of a pulse current of a constant voltage characteristic and a base current of a constant current characteristic between the consumable electrode and a work piece. A pulse frequency correction circuit outputs a frequency correction value f.sub.e to a pulse frequency control circuit, such that when the pulse current upper limit value or lower limit value is selected continuously in a predetermined number of times at a pulse current comparison and adjustment circuit, pulse frequency is increased/decreased by a predetermined value .DELTA.-f by .DELTA.-f in accordance with the selected number of times. According to the pulse frequency control, the pulse arc welding apparatus is capable of substantially increasing a response of an arc length control, and enabling to follow a change of a welding condition and a fluctuation of the distance between a contact tip and a work piece promptly.

REFERENCES:
patent: 5525778 (1996-06-01), Matsui et al.
patent: 5824991 (1998-10-01), Mita et al.

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