Abstract: A method for producing longitudinally welded helically corrugated metal tubing, wherein 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 produced by a corrugation tool that is supported eccentrically and at an angle to the tubing axis, is freely rotatable in a rotationally driven corrugator head, and rolls off the surface of the tubing. The metal strip as well as the uncorrugated metal tubing are 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), and the feed rate of the 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.

Abstract: An apparatus for continuous production of a helically corrugated metal tube (12, 14) includes a corrugator head (11), which is driven by a rotary drive and is freely rotatably supported eccentrically to the longitudinal axis of the metal tube (12, 14). The corrugating tool (16) includes at least one disk whose eccentric position relative to the longitudinal axis of the metal tube (12, 14) is adjustable and whose circumferential surface rolls off the metal tube (12, 14).

Abstract: In a process for producing a welded joint between the ends of two metal strips in which the butted ends are connected by means of a TIG welder that can be moved perpendicularly to the longitudinal direction of the metal strips, one sheet metal piece each is placed in the area of the butt joint along the longitudinal sides of the metal strips. The two sheet metal pieces are tack-welded to the longitudinal edges of the metal strips in the joint area by means of a spot weld of the TIG welding unit. The strip ends are welded together by moving the welder along the joint edges. The welder is activated on one of the sheet metal pieces and moved up to the opposite sheet metal piece, and the two sheet metal pieces are removed from the longitudinal sides.

Abstract: In a process for the continuous production of longitudinally seam-welded and corrugated metal tubes (46), a metal band drawn off from a supply reel is formed into an open-seam tube, welded at its longitudinal edges, and the welded smooth tube (45) corrugated. A withdrawal apparatus driven by an electric motor engages the smooth tube. The smooth tube (45) is corrugated by means of a corrugation plate (43) located in a corrugation head (42) which can be driven rotationally. The corrugation head (42) is driven directly by a hollow shaft motor (37, 38).

Abstract: In a process for the continuous production of longitudinally seam-welded and corrugated metal tubes (46), a metal band drawn off from a supply reel is formed into an open-seam tube, welded at its longitudinal edges, and the welded smooth tube (45) corrugated. A withdrawal apparatus driven by an electric motor engages the smooth tube. The smooth tube (45) is corrugated by means of a corrugation plate (43) located in a corrugation head (42) which can be driven rotationally. The corrugation head (42) is driven directly by a hollow shaft motor (37, 38).