Duplex stainless steel welding method

Details Duplex stainless steel welding method Duplex stainless steel welding method

1993-06-07

1995-08-08

Shaw, Clifford C.

Electric heating

Metal heating

Of cylinders

219137WM, B23K 900

Patent

active

054400902

ABSTRACT:
Duplex stainless steel having about 25% chrome, 7% nickel and 3.5% molybdenum content included in its chemical composition is gas tungsten arc welded by a manual procedure wherein a continuous or segmented root pass weld is made with a filler metal rod of a first diameter and plural cover passes are made in segments or continuously using a filler metal rod of a larger diameter. The weld may be cooled by demineralized water between passes to limit the interpass temperature of the weld to about 300.degree. F. or less. The use of a larger diameter filler rod for the cover passes with a 300.degree. F. temperature limit between passes and segment welds in intermediate and cover passes of 180.degree. reduces time to complete circumferential girth welds for duplex stainless steel pipe by more than 50 percent.

REFERENCES:
patent: 3610876 (1971-10-01), Bhat
patent: 3665147 (1972-05-01), Schobel et al.
patent: 3716691 (1973-02-01), Baybrook et al.

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