Residual stress distributions in arc, laser and electron-beam welds in 30 mm thick SA508 steel: A cross-process comparison
Residual stress distributions in arc, laser and electron-beam welds in 30 mm thick SA508 steel: A cross-process comparison
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DOI：
10.1016/j.ijpvp.2018.03.004
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发表时间：
2018-05-01
影响因子：
3
通讯作者：
Irvine, N. M.
中科院分区：
文献类型：
--
作者：
Balakrishnan, J.;Vasileiou, A. N.;Irvine, N. M.
几十年来，压水堆(PWR)中的安全关键压力容器，如反应堆压力容器和蒸汽发生器，都是采用弧焊工艺制造的。然而，最近对核新建方案的兴趣激起了重新评估可用于焊接这些部件的技术的兴趣。例如，由于减压电子束(RPEB)焊接将提供显著的生产率提高，因此已经做出了相当大的努力来开发它，而在多道窄间隙激光焊接(NGLW)方面也进行了开发工作。在这项工作中，我们评估了两项当前技术和两项未来建造计划的候选技术可能对关键核部件内产生残余应力的影响。采用钨极气体保护焊(GTAW)、埋弧焊(SAW)、多道次焊(NGLW)和RPEB焊4种焊接工艺，在30 mm厚的SA508钢板上进行了单面焊接。用中子衍射法和等高线法测量了各种类型焊缝在焊前状态和焊后热处理后的残余应力分布。并对结果进行了比较和讨论。
Safety-critical pressure vessels in pressurised water reactors (PWRs), such as the reactor pressure vessel and the steam generators, have been fabricated using arc welding processes for several decades. However, recent interest in nuclear new-build programmes has stimulated interest in reassessing the technologies that are available for the welding of these components. For example, considerable effort has been directed at the development of reduced-pressure electron beam (RPEB) welding, owing to the substantial productivity gains it would offer, while developmental work has also been carried out on multipass narrow-gap laser welding (NGLW). In this work we assess the effects that two current technologies, and two candidate technologies for future build programmes, are likely to have on the generation of residual stresses within critical nuclear components. Single sided welds were manufactured in 30 mm thick plates of SA508 steel, using four welding processes: gas-tungsten arc welding (GTAW), submerged-arc welding (SAW), multipass NGLW and RPEB welding. The residual stress distributions for each type of weld have been measured both in the as-welded condition and after post-weld heat treatment, using neutron diffraction and the contour method. The results are compared and discussed.