Patent ID: 8049131

Claim:
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, C: 0.03 to 0.10% Si: 0.6% or less, Mn: 1.7 to 2.5%, P: 0.015% or less, S: 0.003% or less, Ni: 0.1 to 1.0%, Mo: 0.15 to 0.60%, Nb: 0.001 to 0.10%, and Ti: 0.005 to 0.030%, and optionally one or more of Cr: 0.8% or less, V: 0.10% or less, Al: 0.06% or less, B: 0.005% or less, N: 0.001 to 0.006%, Cu: 1.0% or less, Ca: 0.01% or less, REM: 0.02% or less, and Mg: 0.006% or less, 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, C: 0.01 to 0.12%, Si: 0.3% or less, Mn: 1.2 to 2.4%, Ni: 4.0 to 8.5%, Mo: 0.5 to 3.0%, Cr: 0.5 to 3.0%, V: 0.01 to 0.5%, Ti: 0.005 to 0.2%, and Al: 0.02% or less, 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.