Method of large current gas shielded arc welding

Details Method of large current gas shielded arc welding Method of large current gas shielded arc welding

1975-11-21

1978-01-31

Truhe, J. V.

Electric heating

Metal heating

By arc

219 74, B23K 916

Patent

active

040717321

ABSTRACT:
A method of large current gas shielded arc welding wherein the welding is accomplished at high speed by a single electrode or tandem sequence electrodes in an atmosphere of a mixed shielding gas comprising essentially of an inert gas with an addition of less than 30% of carbon dioxide gas or less than 5% of oxygen and supplied at an overall flow rate of 50 to 200 l/min by using large diameter solid wire consumable electrodes of low alloy steel material with a diameter of 3.0 to 6.4 mm .phi. under the following conditions: welding speed 300 to 1500 mm/min; welding current, 600 to 1500 amp; and arc voltage, 23 to 36 volts. With this method, the welding of steel can be accomplished at high speeds with a reduced heat input and an improved efficiency and it is particularly well suited for the welding of open tubes for very low temperature line pipe which must retain a high degree of toughness at very low temperatures.

REFERENCES:
patent: 3185812 (1965-05-01), Richter et al.
patent: 3325626 (1967-06-01), Sargent
patent: 3368887 (1968-02-01), Enis et al.
patent: 3704358 (1972-11-01), Saito et al.
patent: 3803381 (1974-04-01), Bernard et al.
patent: 4020312 (1977-04-01), Araki et al.

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