| 摘要 |
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 DEG 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 TF-TR difference, where TF is the fusing temperature of the metal and TR is the room temperature.
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