Constant current arc welder

Details Constant current arc welder Constant current arc welder

1978-09-26

1981-01-27

Shaw, C. C.

Electric heating

Metal heating

By arc

2191304, B23K 906

Patent

active

042477522

ABSTRACT:
A constant current arc welder of the type in which arc current is regulated by thyristor phase angle adjustment, includes voltage feedback voltage control and current feedback current control, with automatic transfer from the voltage control mode into the current control mode when current has been established in the arc. A time delay allows smooth transfer to the desired current operative level by limiting the current inrush under an initial current reference and with a chosen feedback control dynamic characteristic current boost is also automatically provided when the arc voltage falls below a predetermined level.

REFERENCES:
patent: 2458658 (1949-01-01), Tyrner
patent: 2620465 (1952-12-01), Giroz
patent: 3688180 (1972-08-01), Chiasson et al.
patent: 3746965 (1973-07-01), Okada et al.
patent: 3774007 (1973-11-01), Chiasson et al.
patent: 3904846 (1975-09-01), Risberg
patent: 3912980 (1975-10-01), Crump et al.
patent: 3928746 (1975-12-01), Ericsson
patent: 4071885 (1978-01-01), Bilczo et al.
patent: 4109130 (1978-08-01), Oku

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