Gas back-purging during welding of pipe

Details Gas back-purging during welding of pipe Gas back-purging during welding of pipe

1989-02-23

1990-04-10

Shaw, Clifford C.

Electric heating

Metal heating

Of cylinders

219 74, B23K 916

Patent

active

049162810

ABSTRACT:
Disclosed is an improvement in the process of gas back-purging the root section of the weld during open-butt welding of pipe. The rates of gas flow in back-purging and in torch shielding are controlled and a ratio between the flow rates is established. The invention teaches a gas back-purging flow rate of about 40 CFH and a torch shielding flow rate of about 10 CFH under typical conditions to maintain a required 4 to 1 ratio of the flow rates.

REFERENCES:
patent: 2747065 (1956-05-01), Diehl
patent: 2802092 (1957-08-01), Hauck
patent: 3292254 (1966-12-01), Sloan
"Recommended Practices for Root Pass Welding of Pipe Without Backing", American Welding Society.
Holby, "Power-Plant Pipe Must be Leak Free", Welding Design & Fabrication, 3/1986.
Aastrup et al, "Welding in Stainless Steels with Underside Gas Shielding" Svejsning, vol. 11, Part 1, pp. 13-15, 2/1984.

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