Patent ID: 8296932
Filing Date: 2012-10-30
Classification: B21C,B23K,Y10T

Abstract:
1. Manufacturing equipment of electric resistance welding pipes having excellent characterization of welded seams, comprising: an apparatus that supplies a strip, an apparatus that reforms a shape, an apparatus that performs roll forming, an induction heater, and a contacting apparatus of strip edges by pressing, and having a finpass forming apparatus incorporating a fin having at least two stages of edge tapering in a middle portion of the roll forming, wherein tapering edges of the strip immediately before electric resistance welding is conducted such that an angle from as surface of an edge of the strip toward a vertical direction is in a range of 25 degrees to 50 degrees, and length of a perpendicular angle from a starting position to an end position of the edge tapering at one side is 20% to 45% of strip thickness, and by shaping the edge tapering with a fin, having at least two stages of edge tapering, incorporated in a finpass forming end stand.