Gas-metal-arc welding process

Details Gas-metal-arc welding process Gas-metal-arc welding process

1984-07-24

1986-02-25

Paschall, M. H.

Electric heating

Metal heating

By arc

219121PY, 219121PK, 219121PP, 219121PS, 31323151, B23K 916, B23K 900

Patent

active

045729425

ABSTRACT:
In a gas-metal-arc welding process, a stable plasma formation is produced by a shielding gas mixture whose flow is focused to steadily maintain the plasma formation in central alignment with the arc. Thus, the plasma energy and arc energy are combined and concentrated to yield a higher, more stable welding heat. The process is of the type that utilizes a welding gun having a consumable wire electrode that is continuously advanced towards the weld deposit as its end melts and is transferred to the weld deposit. The gas is a mixture of major proportions of each of argon and helium and minor proportions of each of carbon dioxide and oxygen, which produces a stable, approximately dome-like plasma formation in the arc gap between the electrode melting end and the weld deposit. A portion of the gas that flows through the gun nozzle and around the electrode, is directed at an acute angle towards the electrode axis within the arc gap, and is focused, by adjusting the gap length, upon a spot on the electrode axis at the weld deposit, so that it impinges upon and pressures the plasma formation inwardly into axial alignment with the arc, producing an intense heat zone in the gap.

REFERENCES:
patent: 2686860 (1954-08-01), Buck et al.
patent: 3534388 (1970-10-01), Ito et al.
patent: 4101751 (1978-07-01), Urbanic et al.
patent: 4291217 (1981-09-01), Braun
patent: 4469932 (1984-09-01), Spiegelberg et al.

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