Four-electrode submerged arc welding process

Details Four-electrode submerged arc welding process Four-electrode submerged arc welding process

1982-10-14

1984-04-10

Shaw, C. C.

Electric heating

Metal heating

By arc

219 73, 219123, B23K 918

Patent

active

044423403

ABSTRACT:
A four-electrode submerged arc welding process employs connections of four electrodes aligned in one row for alternating current source so that electromagnetic force Fx.sub.4 in a direction opposite to a welding direction acting upon a middle point of the arc from the rearmost electrode is within -25.ltorsim.Fx.sub.4 .ltorsim.-10 (N/m). The connections are preferably selected such that phase differences among currents applied to the three electrodes other than the frontmost or rearmost electrode are 120.degree., respectively, and a phase difference of the remaining frontmost or rearmost electrode is within 0.degree..+-.30.degree. relative to the furthermost electrode.
With such connections of the four electrodes, the four-electrode submerged arc welding process remarkably prevents welding defects such as undercuts even at higher welding speeds.

REFERENCES:
patent: 2436387 (1948-02-01), Harter et al.
patent: 3336460 (1967-08-01), Hauck et al.
patent: 3456089 (1969-07-01), Shrubsall
patent: 4341944 (1982-07-01), Breen

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