Method for producing longitudinally welded helically...

Details Method for producing longitudinally welded helically... Method for producing longitudinally welded helically...

B - Operations, Transporting

21

D

B21D 15/06 (2006.01) B21C 37/08 (2006.01) B21C 37/20 (2006.01) B21D 21/00 (2006.01)

Patent

CA 2404539

The invention relates to a method for producing longitudinally welded helically corrugated metal tubing. A metal strip pulled from a strip supply is formed into tubing with a longitudinal slit. The longitudinal slit is sealed by welding and the corrugation is preferably produced by a corrugation tool that is supported eccentrically and at an angle to the tubing axis freely rotatable in a rotationally driven corrugator head and that rolls off the surface of the tubing. The metal strip as well as the uncorrugated metal tubing is advanced by a feed device that is provided between the welding point and the corrugation unit. A second feed device (8) engages the corrugated tubing (7) directly behind the corrugation unit (6). The feed rate of this second feed device is slower than the forward feed rate of the corrugated tubing (7) which results from the pitch of the corrugator disk and the rotational speed of the corrugator head.

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