残留水素量を用いた溶接金属の低温割れ限界応力の整理 : HY系高張力鋼溶接金属の低温割れに関する基礎的研究(第4報)

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In this study, the effects of remaining hydrogen content on the lower critical stress of weld metal (LCS) in high strength steels were evaluated, because it was reasonably considered that remaining hydrogen content related with LCS more closely than initial hydrogen content at high temperature measured by JIS or IIW method. The remaining hydrogen contents at 100℃ on bond line ((H_R)_<100>) of HT60,HT80,HY130 and HY180 weldments were measured in the LB-TRC test specimen using GTA welding with Ar-H_2 mixed shielding gases by means of gas chromatograph, of which the measurement accuracy was 0.01 ml. Those were measured under four kinds of thermal cycles and then the relations between (H_R)_<100> and the thermal factor ((ΣDΔt)_<100>) which related with thermal cycle were deduced. Consequently, the experimental equations between ((ΣDΔt)_<100> and (H_R)_<100>/H_0 of all materials used were deduced as follows. [numerical formula] where A ; 83 (HT60), 69 (HT80), 46 (HY130) and 41 (HY180) H_0 ; initial hydrogen content Moreover, the relations between the LCS obtained by the LB-TRC test and (H_R)_<100> were evaluated, but the LCS were not related to (H_R)_<100>. Therefore, the remaining hydrogen contents of weld metal ((H_<RW>)_<100>) were calculated using the analytical solutions of one-dimensional diffusion equation. Consequently, the lower critical stress of weld metal strongly depended on (H_<RW>)_<100> than (H_R)_<100>.
社団法人溶接学会の論文
1987-05-05

残留水素量を用いた溶接金属の低温割れ限界応力の整理 : HY系高張力鋼溶接金属の低温割れに関する基礎的研究(第4報)

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