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本文介绍了应用国际焊接学会推荐的插销试验法对广泛应用于汽轮机和压缩机的34CrNi3Mo钢的焊接冷裂敏感性进行的研究,探索了冷却时间、扩散氢含量和预热温度对其冷裂倾向的影响。 研究结果表明:34CrNi3Mo钢有较大的冷裂敏感性。冷却时间、扩散氢含量和预热温度对临界断裂应力(σcr)imp均有影响。焊后必须采取有效的热处理措施改善组织才能保证不出现冷裂纹。 同时指出,日本溶接学会IL委员会提出的(σcr)imp经验计算公式对许多低合金钢都是适用的,但对34CrNi3Mo这样的含碳量较高、淬硬倾向较大的低合金钢适用性较差,因此认为该公式应有一定的使用范围。
This paper introduces the research on the cold cracking susceptibility of 34CrNi3Mo steel widely used in steam turbines and compressors based on the plug test method recommended by the International Welding Society and explores the influence of cooling time, diffusible hydrogen content and preheating temperature on cold cracking tendency Impact. The results show that: 34CrNi3Mo steel has greater cold cracking susceptibility. Cooling time, diffusible hydrogen content and preheating temperature have an impact on critical fracture stress (σcr) imp. After welding must take effective heat treatment measures to improve the organization to ensure that no cold cracks appear. At the same time, it is pointed out that the empirical formula of (σcr) imp proposed by Japan Immersion Society IL Committee is suitable for many low alloy steels. However, the applicability of 34CrNi3Mo such low carbon steels with higher carbon content and higher hardenability Therefore, the formula should have a certain scope of use.