Manufacturing apparatus for electric welded pipe

Abstract

Abstract PURPOSE: To uniformly preheat both end faces of the strip on purpose to manufacture the electric welded pipe with uniformly shaped heat-affected zone, by installing the current density regulator, which consists of two conductive rods whose ends are connected together with, along the V-type end face formed by bending, and by supplying the current that is in-phase with the welding current. CONSTITUTION: Two conductive rods 13, 14, are installed from the neighborhood of contact tips 9a, 9b, to the neighborhood of the weld point 12 along the V-type end faces of the strip 7; the tips of the conductive rods 13, 14, are connected by the coil 15 and the iron core 16; hereby, the current density regulator 17 is constituted. Contact tips 9a, 9b, are connected to the oscillator for generating the current being in-phase with the high frequency welding current. This current density regulator 17 is installed inside and outside the tubular body in case of need. According to this apparatus, the current density of the high frequency current flowing through the pipe end face is uniformarized just from the neighborhood of contact tips 9a, 9b, so that the thick walled electric welded pipe can be manufactured at high quality, at high efficiency COPYRIGHT: (C)1979,JPO&Japio

Inventors

• 👤 Fumio Kaneda
• 👤 Tadahiro Maeike

Bibliographic Details