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...

2005-10-11

2005-10-11

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C420S109000, C420S104000, C420S110000, C219S1370WM, C219S121140

Reexamination Certificate

active

06953508

ABSTRACT:
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):in-line-formulae description="In-line Formulae" end="lead"?T(seconds)≧exp(7.0×Pw+4.66)  Equation (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Pw=Pcm+HD/60  Equation (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Pcm(mass %)=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B  Equation (3)in-line-formulae description="In-line Formulae" end="tail"?HD [ml/100 g]: amount of hydrogen in the weld metal immediately after welding.

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Wenyue Z: “Prediction And Prevention Of Cold Cracking In Pipe-Line Steel Welding”, China Welding, vol. 41, No. 2, Feb. 1995, pp. 25-33.
Maroef, I, et al.: “Hydrogen Trapping In Ferrite Steel Weld Metal”, International Materials Reviews, ASM International, Materials Park, US, vol. 47, No. 4, 2002, pp. 210-211.
Prasad, S, et al.: “Significance Of Hydrogen Control In The Welding Of Low Alloy Steels”, Indian Welding Journal, Indian Institute of Welding, Calcutta, IN, vol. 16, No. 3, Jul. 1984, pp. 87-93.

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