Consumable-electrode AC gas shield arc welding method and appara

Details Consumable-electrode AC gas shield arc welding method and appara Consumable-electrode AC gas shield arc welding method and appara

1993-05-24

1994-09-20

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913051, B23K 909

Patent

active

053491599

ABSTRACT:
A consumable electrode gas shielded AC arc welding method and an apparatus to practice the method applies alternating current across a consumable electrode and a base metal. During a first period, the electrode is positive and a current of a first level higher than a specified critical level is furnished. During a second period, the electrode is kept positive and current is reduced to a second level lower than the first level. During a third period, the electrode is kept negative at a third current level. These periods are periodically repeated. If during the frist period, the arc voltage drops below a predetermined voltage, current of a fourth level higher than the first level is furnished until the arc voltage exceeds the predetermined level.

REFERENCES:
patent: 3803382 (1974-04-01), Tajbl et al.
patent: 4876433 (1989-10-01), Kashima et al.

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