Electric arc welder that provides non-sticking arc initiation an

Details Electric arc welder that provides non-sticking arc initiation an Electric arc welder that provides non-sticking arc initiation an

1983-06-16

1985-06-11

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913031, 2191304, B23K 910

Patent

active

045230773

ABSTRACT:
An electric arc welder has a current-conducting means which can supply welding power to an arc along a first volt-ampere curve, has a second current-conducting means which can be paralleled with the first current-conducting means to supply welding power to that arc along a second and distinctly-different volt-ampere curve, has a voltage-sensing circuit which senses the arc voltage, and has a control circuit which automatically and virtually-instantaneously shifts the supplying of welding power from a point on the first volt-ampere curve to a point of essentially-equal potential on the second and distinctly-different volt-ampere curve when the voltage-sensing circuit senses that the arc voltage has fallen below a predetermined value. That control circuit will subsequently shift the supplying of welding power from a point on the second and distinctly-different volt-ampere curve to a point of essentially-equal potential on the first volt-ampere curve when the voltage-sensing circuit senses that the arc voltage has risen above that predetermined value. In this way, a welding wire or welding rod can be continually advanced toward a weld puddle in a work piece, and the welding power which is supplied along the second and distinctly-different volt-ampere curve will transfer the tip of that welding wire or welding rod to that weld puddle without "shorting" and thereby extinguishing the arc.

REFERENCES:
patent: 2458658 (1949-01-01), Tyrner
patent: 3809853 (1974-05-01), Manz
patent: 4201906 (1980-05-01), Puschner
patent: 4409465 (1983-10-01), Yamamoto et al.
Form No. B4-PP-39 and Blueprint No. 80-810-7 of the Big Four Manufacturing Co., Inc., (1980).

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