Method for the production of longitudinally seam welded metal tubes

摘要

The method concerns production of a metal tube out of a strip which is given a tubular form with a longitudinal slit, and is completed by laser welding. It is characterised by the following features: a) immediately in front of the welding point, the tube surface is gripped by a first tool which holds the opposing strip edges in contact with one another; b) immediately after the welding point, the tube surface is gripped by a second tool which levers the weld seam free, and keeps the joint free of forces; c) immediately after the second tool, the tube is gripped by the jaws of a clamping unit which conveys the tube without rotation.