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本文通过模拟焊接热循环技术,研究测定了12Ni2CrMoV钢焊接CCT图,掌握了该焊接过热区相变规律和组织特征。同时用斜Y型铁研试验法研究了预热温度对该钢焊接冷裂敏感性的影响。试验结果表明,在焊缝金属扩散氢含量为1ml/100g和2ml/100g时,斜Y型铁研试验临界预热温度分别为60℃和100℃。提出为保证12Ni2CrMoV钢焊接过热区具有良好缺口韧性时,其焊接线能量不宜超过29.3～33.4×10~(?)3/cm。本文通过焊接CCT图数据与斜Y型铁研试验数据的一致性,提出12Ni2CrMoV钢最佳焊接工艺条件,同时应用于实际生产的大型焊接结构上,并取得良好的焊接质量。
In this paper, by simulating the welding thermal cycle technology, the welding CCT diagram of 12Ni2CrMoV steel was studied and measured, and the phase transition law and microstructure characteristics of the overheated welding zone were grasped. At the same time, the effect of preheating temperature on the cold cracking susceptibility of the steel was studied by the oblique Y-type iron research method. The experimental results show that the critical preheating temperature of the oblique Y-type iron-based test is 60 ℃ and 100 ℃ respectively when the hydrogen content of the weld metal is 1ml / 100g and 2ml / 100g. In order to ensure good notch toughness in 12Ni2CrMoV steel overheat zone, the welding wire energy should not exceed 29.3 ~ 33.4 × 10 ~ (?) 3 / cm. In this paper, the best welding conditions of 12Ni2CrMoV steel are proposed based on the consistency between the CCT data of welding and the data of oblique Y-type iron study, and applied to the large-scale welding structure actually produced, and achieved good welding quality.