Gas metal arc welding of aluminum-based workpieces

Details Gas metal arc welding of aluminum-based workpieces Gas metal arc welding of aluminum-based workpieces

1989-09-11

1990-03-27

Shaw, Clifford C.

Electric heating

Metal heating

By arc

219 74, 219137WM, B23K 9225

Patent

active

049122991

ABSTRACT:
Method of welding aligned aluminum torque tube components, comprising (i) defining a stepped square-butt joint to be welded by preforming the ends of said torque tubes and assembling such ends together in the nested condition; (ii) establishing an electrical direct current arc between a positive consumable aluminum-based electrode and said joint as cathode, the arc being shrouded in a shielding gas consisting, by volume, of 2-5% oxygen and the remainder inert gas, the current to the arc being pulsed at a frequency of 40-60 cycles per second while maintaining an average current of at least 200 amps; and (iii) while holding the pulsed arc in a predetermined orientation (i.e., position angle 45.degree.-60.degree., lead angle 5.degree.-15.degree., transverse angle 12.degree.) to the joint, moving the arc along the joint in a single pass at a relative speed of at least 60 inches per minute.

REFERENCES:
patent: 2892072 (1959-06-01), Miller
patent: 4273988 (1981-06-01), Iceland et al.
patent: 4507543 (1985-03-01), Ukai et al.
patent: 4542280 (1985-09-01), Simons
patent: 4628181 (1986-12-01), Pan et al.
patent: 4749841 (1988-06-01), Galantino et al.
Welding Journal, American Welding Society, pp. 21-27, "GMA Welding of Aluminum with Argon/Freon Shielding Gas Mixtures."
Handbook published by Kaiser Aluminum Co., 1967, pp. 7-9 through 7-11, excerpts.
Welding Handbook of American Welding Society, vol. 4, 7th Ed. 1978, chap. 8, "Aluminum Alloys", pp. 347-348.
Technical Paper Presented at Aluminum Asso. Meeting, Mar. 1983, "MIG Welding of Aluminum", pp. 6.15 and 6.28.

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