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首页> 外文会议>PVP2011;ASME Pressure Vessels and Piping conference >EFFECT OF THE GROOVE SHAPE ON RESIDUAL STRESS DISTRIBUTION OF NARROW GAP WELDS
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EFFECT OF THE GROOVE SHAPE ON RESIDUAL STRESS DISTRIBUTION OF NARROW GAP WELDS

机译：沟槽形状对窄缝焊缝残余应力分布的影响

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Recently, in Korea, the reactor coolant main loop piping and the steam generator have been connected with narrow gap welding (NGW) method after the replacement of steam generator of Korean nuclear power plants. The NGW method has many advantages, for instance, the reduction of welding time and the shrinkage of weld, and the small deformation of a component resulting from the small groove angle and welding bead width. In the actual welding process with NGW, some different groove shapes have been adapted. Noting that the distribution of a weld residual stress is significantly affected by welding conditions, for instance, shape of weld groove, direction of welding and width of weld groove etc., the weld residual stress due to NGW with different welding conditions should be accurately investigated for its application to life assessment considering actual conditions since these residual stress distributions can affect the susceptibility of parent and weld material to the primary water stress corrosion cracking (PWSCC) which is one of main issues in the nuclear component integrity. In this context, the present paper investigates the distribution of the weld residual stress as well as the deformation behavior of ER308L weld due to NGW using the nonlinear 2-dimensional (2-D) finite element (FE) analysis in which the detailed actual welding process of NGW was simulated. In particular, the effect of shape of weldment, i.e., the shape of welding groove ("single-side weld" and "double-side weld") and the width of weld, on the residual stress is emphasized. Based on the FE results, the relevant groove shape is discussed in the sense that it provides lower residual stress values at the inner surface of pipe, which might reduce susceptibility to PWSCC.
机译：近来，在韩国，在替换韩国核电厂的蒸汽发生器之后，反应堆冷却剂主回路管道和蒸汽发生器已通过窄缝焊接法（NGW）进行连接。 NGW方法具有许多优点，例如，减少了焊接时间和焊缝收缩，以及由于小坡口角和小焊缝宽度而导致的零件变形小。在实际的NGW焊接过程中，已经适应了一些不同的凹槽形状。注意到焊接残余应力的分布受焊接条件的影响很大，例如焊接槽的形状，焊接方向和焊接槽的宽度等，应准确研究不同焊接条件下NGW引起的焊接残余应力。由于这些残余应力分布会影响母体和焊接材料对主要水应力腐蚀开裂（PWSCC）的敏感性，而这是核部件完整性的主要问题之一，因此在考虑实际条件时将其应用到寿命评估中。在这种情况下，本文使用非线性二维（2-D）有限元（FE）分析方法研究了焊缝残余应力的分布以及由于NGW引起的ER308L焊缝的变形行为，其中详细地详细介绍了实际的焊接工艺。模拟了NGW的过程。特别地，强调了焊接形状，即焊接槽的形状（“单面焊缝”和“双面焊缝”）和焊缝宽度对残余应力的影响。基于有限元分析结果，从某种意义上讨论了相关的沟槽形状，因为它在管道内表面提供了较低的残余应力值，这可能会降低对PWSCC的敏感性。

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