Method and apparatus for making an electric resistance welded tu

Details Method and apparatus for making an electric resistance welded tu Method and apparatus for making an electric resistance welded tu

1982-05-25

1984-06-26

Reynolds, B. A.

Electric heating

Metal heating

Of cylinders

219 1043, 219 1077, 219 1079, 219 612, 219110, H05B 640, B23K 3106

Patent

active

044568037

ABSTRACT:
A conductor is installed along a Vee-angle part of a tube to be welded for producing an electric welded tube by high frequency resistance or induction welding. The conductor is set closely above the Vee-angle part. A high-frequency current having about the same phase as a phase of a high-frequency current for welding is supplied to the conductor. This controls the distribution of the current density on mating surfaces of Vee-angle part so that the welding current does not concentrate in the upper and lower edges of the tube, thus making uniform the current density and heating in the Vee-angle part.

REFERENCES:
patent: 2139211 (1938-12-01), Sessions
patent: 2666831 (1954-01-01), Seulen et al.
patent: 2794893 (1957-06-01), Crawford
patent: 2938993 (1960-05-01), Rudd
patent: 3004136 (1961-10-01), Peterson
patent: 3253112 (1966-05-01), Worden
patent: 3482073 (1969-12-01), Roberts
patent: 3573416 (1971-04-01), Drechsler
patent: 3612809 (1971-10-01), Mohr
patent: 3860778 (1975-01-01), Rudd et al.
patent: 4197441 (1980-04-01), Rudd
"High Frequency Continuous Seam Welding of Ferrous and Nonferrous Tubing", by Osborn, Jr., The Welding Journal, vol. 35, No. 12, Dec. 1956.

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