Sensitivity analysis on welding defects of Nickel-base welding material at safe-end

MA Shuli; LUO Ying; WANG Xuxin; ZHOU Gaobin; ZHANG Yabin; QIU Tian

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Sensitivity analysis on welding defects of Nickel-base welding material at safe-end
Vol. 49, Issue 4, Pages: 133-137(2019)
Published：2019
DOI：
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DOI：

MA Shuli, LUO Ying, WANG Xuxin, et al. Sensitivity analysis on welding defects of Nickel-base welding material at safe-end[J]. Eletric Welding Machine2019, 49(4): 133-137. DOI：

摘要

反应堆压力容器接管安全端焊缝为异种金属焊缝

使用690合金过渡连接低合金钢与不锈钢

制造过程中690焊材易产生微裂纹、未熔合和氧化物夹杂等缺陷。通过分析缺陷产生机理并结合实际制造情况

研究化学成分、焊接方法、工艺参数、辅助工艺措施以及坡口结构等对690镍基焊材焊接缺陷敏感性的影响。结果表明

合理控制合金元素含量可达到降低结晶裂纹敏感性的目的;适当减少焊接热输入

避免熔池过热

可降低裂纹和未熔合敏感性;控制坡口收缩变形

能够避免对焊接质量的不利影响。

Abstract

The safe-end weld of reactor pressure vessel nozzle is dissimilar metal weld

which connects low alloy steel and stainless steel with Inconel 690. The welding material Inconel 690 is easy to generate micro-cracks

lack of fusion

oxide inclusions and other defects in the manufacturing process. By analyzing defect generation mechanism and combining actual manufacturing situation

the effects of chemical composition

welding method

welding parameters

auxiliary procedure measures and groove structure on the defect sensitivity of welding material Inconel 690 are studied. The results show that reasonable control of alloy element content can reduce the sensitivity of crystal crack. Appropriate reduction of welding heat input and avoidance of molten pool overheating can reduce the sensitivity of crack and lack of fusion. Control of groove shrinkage deformation can avoid adverse effects on welding quality.