Method for producing lengthwise welded metal tubes

Details Method for producing lengthwise welded metal tubes Method for producing lengthwise welded metal tubes

1996-01-11

1997-08-19

Walberg, Teresa J.

Electric heating

Metal heating

By arc

21912176, B23K 2600

Patent

active

056584733

ABSTRACT:
In a method for producing lengthwise welded metal tubes, a metal tape is drawn from a supply reel and is gradually formed into a slotted tube, and the slotted tube is welded by a laser beam, the tape edges are heated by a separate laser beam. The laser beams for the heating and welding strike the lengthwise seam at an angle that is less than 15.degree. from the vertical, the distance between the burn spots produced by the laser beams is between 1 and 5 mm, and the power applied to the tape edges by the first laser beam is sufficient to raise the temperature of the tape edges to at least one half of the T.sub.F -T.sub.R difference, where T.sub.F is the fusing temperature of the metal and T.sub.R is the room temperature.

REFERENCES:
patent: 3615977 (1971-10-01), Lehnert et al.
patent: 4759487 (1988-07-01), Karlinski
patent: 4769522 (1988-09-01), Lentz et al.
patent: 4857697 (1989-08-01), Melville
patent: 5216220 (1993-06-01), Davis et al.

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