Method and apparatus for controlling welding current in resistan

Electric heating – Metal heating – For bonding with pressure

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219109, B23K 1125

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active

051245213

ABSTRACT:
For improving the quality of welding operations, in a process for alternating current welding, in which during a period the actual r.m.s., welding current is measured and the phase displacement of the use of current flow during the next period of the a.c. current is regulated. Variations of the actual r.m.s. welding current during all the welding periods already performed are taken into account and compared with a desired r.m.s. current during the welding period to be performed. A welding apparatus for alternating current welding using two welding electrodes, a power supply for the same and a device for regulating the r.m.s. welding current during each a.c. voltage period has a computer for taking into account variations of the actual r.m.s. welding current during preceding welding periods of a welding operation compared with a desired r.m.s. welding current flow during the further welding periods to be performed of the particular welding operation.

REFERENCES:
patent: 4516008 (1985-05-01), Jones
patent: 4634830 (1987-01-01), Furudate
patent: 4795877 (1989-01-01), Bridgstock et al.
patent: 4954686 (1990-09-01), Izume
Abstracts--vol. 6 #1 Jan. 7, 1989 56-126084.
Abstracts--vol. 13 #300 Jul. 11, 1989 1-91978.

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