APPARATUS FOR INDUCTIVE LONGITUDINAL OR HELICAL SEAM WELDING OF TUBULAR METALLIC WORKPIECES

摘要

An apparatus for inductive longitudinal or helical seam welding of tubular metallic workpieces has a tube roller device for advancing a tubular workpiece shaped from a metal band so as to have a V-shaped gap between the butt faces of the band. The roller device also applies pressure to the workpiece for joining the butt faces. The apparatus has a longitudinal inductor and a second ring-shaped inductor disposed between the longitudinal inductor and the location whereat the butt faces are joined. The longitudinal inductor is located above the V-shaped gap in partially overlapping relation to the gap edges and has longitudinal iron yoke sheet metal members in proximity to the edges. The longitudinal inductor has two component parts one of which overlaps one of the gap edges and the other part overlaps the opposite edge of the V-shaped gap. Current supply conductors form respective windings for the two conductor parts. Each of the windings is arranged above a portion of the tube surface corresponding adjacent to the gap edge overlapped by the corresponding one of the component inductor parts.