Welded tubular articles and method for making the same

Details Welded tubular articles and method for making the same Welded tubular articles and method for making the same

1960-02-29

1980-09-16

Envall, Jr., Roy N.

Electric heating

Metal heating

Of cylinders

219 64, 219 67, 219105, B23K 3106, B23K 902

Patent

active

042231965

ABSTRACT:
A welded seam between overlapped edges of sheet material wherein the sheet material is heated to a temperature below the melting temperature and is forced together under high pressures to form a forged weld. The thickness of the sheet material in the weld area is reduced from double thickness to a thickness approaching a single thickness, with the weld interface being diagonally disposed. The weld is effected by grain growth across the interface such that the particular line along which the meeting surfaces of the metal are welded together is unobservable upon etching a cross section thereof and with magnification on the order of 100X. The heating is effected by applying to opposing edge portions which are to be overlapped and welded a high frequency current which effectively reduces heating to edge portions only of the metal with the heat effected area being in the vicinity of 0.1 inch.

REFERENCES:
patent: 1249532 (1917-12-01), Smith et al.
patent: 1865531 (1932-07-01), Lutz
patent: 1905478 (1933-04-01), Lutz
patent: 1905479 (1933-04-01), Lutz
patent: 2078546 (1937-04-01), Sebell
patent: 2187740 (1940-01-01), Hothersall
patent: 2454948 (1948-11-01), Seltzer
patent: 2673275 (1954-03-01), Kreft
patent: 3069530 (1962-12-01), Early et al.

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