Patent ID: 7626139
Filing Date: 2009-12-01
Classification: B21C,B23K,Y10T

Abstract:
1. A method for manufacturing a seamed flux-cored wire comprising a sheath prepared by forming a band steel in a tube and a flux filled inside the sheath, the method comprising the steps of: forming the band steel into U-shape in cross section; filling the U-shape formed band steel with flux; forming the U-shape formed band steel filled with flux into a tube-like formed wire; applying a wire drawing lubricant containing a sulfur-bearing high-pressure lubricant to the tube-like formed wire to provide a lubricant coated tube-like formed wire; drawing the lubricant coated tube-like formed wire, wherein drawing of a wire having an area no greater than 1.1 times a final product area is performed using a roller die; removing the lubricant from the drawn wire by a physical means; and coating a wire feeding lubricant for wire feeding on the wire surface, wherein at least a part of the drawing step, the removing step and the coating step are performed in an in-line manner, and wherein the wire drawing lubricant is applied in an amount such that the amount of the wire drawing lubricant remaining on the surface of the wire after drawing falls within the range of 0.1 to 0.6 g of sulfur per 10 kg of the wire in terms of the sulfur amount on the surface of the wire after drawing.