Patent ID: 8049131
Filing Date: 2011-11-01
Classification: B23K,Y10T

Abstract:
1. A method for producing a welded joint excellent in cold cracking resistance of a weld metal, characterized by: (i) shaping a steel plate into a pipe, wherein said steel plate contains, in mass, and optionally one or more of with the balance being Fe and unavoidable impurities; (ii) welding said steel plate from the inner side by using a welding wire containing, in mass, with the balance being Fe and unavoidable impurities; and (iii) thereafter welding said steel plate from the outer side by using said welding wire, wherein said welding from said outer side is carried out in a manner so that a reheating temperature of the inner side weld metal reaches within the range from 500° C. to 700° C.