Output control of short circuit welding power source

Details Output control of short circuit welding power source Output control of short circuit welding power source

1984-04-04

1985-10-08

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913021, 21913051, B23K 909

Patent

active

045462348

ABSTRACT:
A method of controlling the output of a power source in consumable electrode arc welding in which a short circuiting phase and an arcing phase alternately take place between a consumable electrode and a workpiece in a shielding gas atmosphere, the method being characterized by repetition of a cycle of operation consisting of: a first stage of maintaining the output welding current at a first value of a relatively low level upon establishment of a short circuit across a gap between a consumable electrode and a workpiece; a second stage of maintaining the welding current at a second value of a relatively high level succeedingly to the first stage; a third stage of lowering the welding current to a third value of a low level upon detection of necking as a premonition of rupture of short circuiting molten metal between the electrode and workpiece; a fourth stage of, upon generation of an arc across a gap between the electrode and workpiece subsequent to the third stage, maintaining the welding current at a fourth value of a relatively high level exceeding the value of average welding current; and a fifth stage of maintaining the welding current at a fifth value of a relatively low level until the gap between the electrode and workpiece is short-circuited, under control of substantially constant current characteristics to feed current of constant level irrespective of variations in arc length.

REFERENCES:
patent: 3459920 (1969-08-01), Sevenco
patent: 3673377 (1972-06-01), Erdmann-Jesnitzer
patent: 3792225 (1974-02-01), Needham et al.
patent: 4300035 (1981-11-01), Johansson
patent: 4469933 (1984-09-01), Mizuno et al.
patent: 4485293 (1984-11-01), Tabata et al.

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