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采用插销试验法研究了30CrMnSiA和30CrMnSiNi2A两种低合金高强度钢的冷裂倾向。定量地探讨了在焊接线能量一定的条件下所获得的不同焊接热循环和不同扩散氢含量对焊接热影响区冷裂倾向的影响。确定了两种钢的临界断裂应力同扩散氢含量、予热温度、冷却时间以及后热温度的关系。试验结果表明,在焊条400℃,1h烘干的条件下,予、后热温度分别为250℃和110℃时,30CrMnSiA钢的临界断裂应力σ_(Cr)≥σ_S;予、后热温度都为250℃时,30CrMnSiNi2A钢的临界断裂应力σ_(Cr)≥σ_S。
The cold cracking tendency of two kinds of low alloy high strength steels, 30CrMnSiA and 30CrMnSiNi2A, was studied by using the plug test method. The influence of different welding thermal cycle and different diffusion hydrogen content on the cold cracking tendency in HAZ was discussed quantitatively under certain welding wire energy. The relationship between the critical fracture stresses of two kinds of steels and the diffusible hydrogen content, preheating temperature, cooling time and postconditioning temperature was determined. The experimental results show that the critical stress σ Cr (Cr) of the 30CrMnSiA steel is ≥σ_S at preheating and post-heating temperatures of 250 ℃ and 110 ℃, respectively, under the conditions of 400 ℃ and 1h, 250 ℃, the critical fracture stress of 30CrMnSiNi2A steel σ_ (Cr) ≥ σ_S.