Method of manufacturing metal tubes

Details Method of manufacturing metal tubes Method of manufacturing metal tubes

1998-07-23

2000-04-25

Shaw, Clifford C.

Electric heating

Metal heating

Of cylinders

219 75, B23K 9167

Patent

active

060546670

ABSTRACT:
A device and a method of manufacturing a metal tube made from a metal sheet with two substantially straight and parallel longitudinal edges, in which method the two longitudinal edges of the metal sheet are welded together using a welding method employing at least one electric arc between at least one electrode (Ei) and the metal sheet in contact with at least one ground lead (PMi), in which the plane of each ground lead (PMi) is positioned a distance (e.sub.i) of between -5 mm and +25 mm with respect to the plane of each corresponding electrode (Ei), the positive direction being the direction of relative travel of the metal sheet with respect to the at least one electrode (Ei).

REFERENCES:
patent: 1872008 (1932-08-01), Richter
patent: 3131284 (1964-04-01), Gibson
patent: 3349213 (1967-10-01), Gorman
patent: 3931489 (1976-01-01), Roderburg et al.
patent: 4396820 (1983-08-01), Puschner
patent: 4811888 (1989-03-01), Ziemek et al.

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