Electric heating – Metal heating – By arc
Patent
1988-11-16
1990-02-27
Shaw, Clifford C.
Electric heating
Metal heating
By arc
21913051, 219136, B23K 910
Patent
active
049048430
ABSTRACT:
An unconsumable electrode such as tungsten is opposingly arranged with a base metal to be welded. An AC arc welding power supply is connected between the base metal and the unconsumable electrode. A filler wire such as of aluminum is fed by a wire feeder toward an arc-generated part between the base metal and the unconsumable electrode. Also included is a wire-heating power supply for producing a pulsed current. The wire heating power supply heats the filler wire by supplying thereto a pulsed current in accordance with a sync signal from the AC arc welding power supply or a detection signal of an arc current i.sub.A or an arc voltage of the AC arc power supply. The filler wire is thus heated by being supplied with a heating current i.sub.W in pulse form while the unconsumable electrode is kept negative by an AC arc formed between the unconsumable electrode and the base metal. During the period when the unconsumable electrode is kept positive by the AC arc, the filler wire is not supplied with any current or is heated by being supplied only with a sufficiently small current not to cause any substantial magnetic flow. Accordingly, even if a large current flows through the wire, arc interruptions can be eliminated, thereby improving the welding process of aluminum by using an AC TIG arc.
REFERENCES:
patent: 4366362 (1982-12-01), Ohta et al.
patent: 4467176 (1984-08-01), Mizuno et al.
patent: 4485293 (1984-11-01), Tabata et al.
patent: 4614856 (1986-09-01), Hori et al.
Butsusaki Yasuhiro
Hori Katsuyoshi
Matsumura Yoshiaki
Takuwa Toshiaki
Babcock-Hitachi Kabushiki Kaisha
Shaw Clifford C.
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