Study of the Stress State of a Dissimilar Metal Weld Due to Manufacturing and Operational Conditions

IF 1.3 Q3 ENGINEERING, MECHANICAL

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2022-01-07 DOI:10.3311/ppme.19063

Bernadett Spisák, Z. Bézi, S. Szávai

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引用次数: 2

Abstract

Welding is accompanied by the presence of weld residual stresses, which in case of dissimilar metal welds even with post weld heat treatment cannot be removed completely therefore they should be considered when assessing possible welding defects. The measurement of residual stress in metal weld is a very complex procedure and also in the investigated case could not be carried out as it is the part of a working plant. However, by modelling these processes, the residual stresses and deformation of the components caused by this manufacturing method can be determined. It is important to calculate these values as accurately as possible to determine the maximum load capacity of the structure. The structure under examination was the dissimilar metal weld of a VVER-440 steam generator. 2D simulations were performed, where temperature and phase-dependent material properties were implemented. Different loading scenarios were considered in the numerical analysis. The results can be useful to determine the real loading conditions of a given component and can be used to predict stress corrosion crack initiation locations, as well as to evaluate the lifetime and failure mode prediction of welded joints.

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制造和操作条件下异种金属焊缝应力状态的研究

焊接伴随着焊缝残余应力的存在，在不同金属焊缝的情况下，即使焊后热处理也不能完全消除残余应力，因此在评估可能的焊接缺陷时应考虑残余应力。金属焊缝残余应力的测量是一个非常复杂的过程，而且在本研究案例中，由于它是工作设备的一部分，因此无法进行测量。然而，通过对这些过程进行建模，可以确定由这种制造方法引起的部件的残余应力和变形。重要的是要尽可能准确地计算这些值，以确定结构的最大承载能力。所研究的结构是VVER-440蒸汽发生器的异种金属焊缝。进行了2D模拟，其中实现了与温度和相相关的材料特性。数值分析中考虑了不同的加载情况。该结果可用于确定给定构件的实际加载状态，并可用于预测应力腐蚀裂纹起裂位置，以及评估焊接接头的寿命和失效模式预测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING ENGINEERING, MECHANICAL-

CiteScore

2.80

自引率

7.70%

发文量

审稿时长

20 weeks

期刊介绍： Periodica Polytechnica is a publisher of the Budapest University of Technology and Economics. It publishes seven international journals (Architecture, Chemical Engineering, Civil Engineering, Electrical Engineering, Mechanical Engineering, Social and Management Sciences, Transportation Engineering). The journals have free electronic versions.