High strength steel weld having improved resistance to cold...

Details High strength steel weld having improved resistance to cold... High strength steel weld having improved resistance to cold...

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B23K 35/24 (2006.01) B23K 31/02 (2006.01) C21D 1/84 (2006.01) C21D 9/50 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/14 (2006.01)

Patent

CA 2415573

A welding method includes performing welding to form a weld metal consisting essentially of, in mass %, C: 0.01 - 0.15%, Si: 0.02 - 0.6%, Mn: 0.6 - 3.0%, Al: 0.004 - 0.08%, Ti: 0.003 - 0.03%, B: at most 0.005%, Cu: 0 - 1.2%, Ni: 0 - 3%, Cr: 0 - 1.2%, Mo: 0 - 2%, V: 0 - 0.05%, Nb: 0 - 0.05%, and a remainder of Fe and unavoidable impurities. The amounts of impurities are P: at most 0.03%, S: at most 0.03%, N: at most. 0.01.%, Ca or Mg: at most 0.005%. The value of Pcm expressed by the following Equation (3) is in the range of 0.23 - 0.35%, and the time T until the weld metal is cooled to 100°C after welding satisfies the following Equation (1): T (seconds) >= exp(7.0 × Pw + 4.66) ..... Equation (1) Pw = Pcm + HD/60 ..... Equation (2) Pcm (mass%) = C + Si/30 + Mn/20 + Cu/20 + Ni/60 + Cr/20 + Mo/15 + V/10 + 5B ..... Equation (3) HD [ml/100 g]: amount of hydrogen in the weld metal immediately after welding.

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