ELECTRIC RESISTANCE WELDED PIPE WELDING DEVICE AND ELECTRIC RESISTANCE WELDED PIPE WELDING METHOD

摘要

An electric resistance welded pipe welding device for manufacturing an electric resistance welded pipe that melts both end face portions, of an open pipe having an opening portion extending in a running direction, both the end face portions that face the opening portion each other from both sides and are made of a pipe material, by induced currents generated by an induction heating means and brings the end face portions into contact with each other at a squeeze roll unit while gradually narrowing a gap of the opening portion and welds the end face portions together, the electric resistance welded pipe welding device includes: as the induction heating means, an induction coil composed of a pair of opening-vicinity conductor parts that are extended in the running direction along the end face portions at both sides of the opening portion and are arranged apart from an outer peripheral surface of the open pipe at positions not overlapping the opening portion in a plan view; and a first-portion circulating conductor part that is integrally provided at at least end portions, of the opening-vicinity conductor parts, on the side close to the squeeze roll unit in a longitudinal direction and is arranged apart from the outer peripheral surface of the open pipe so as to circulate around a portion, of the outer peripheral surface of the open pipe, excluding the opening portion.