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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Welding Strength Matching Coefficient and Cold Stretching on Welding Residual Stress in Austenitic Stainless Steel
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Influence of Welding Strength Matching Coefficient and Cold Stretching on Welding Residual Stress in Austenitic Stainless Steel

机译：焊接强度匹配系数和冷拉伸对奥氏体不锈钢焊接残余应力的影响

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摘要

Austenitic stainless steel is widely used in pressure vessels for the storage and transportation of liquid gases such as liquid nitrogen, liquid oxygen, and liquid hydrogen. Cryogenic pressure vessel manufacturing uses cold stretching technology, which relies heavily on welding joint performance, to construct lightweight and thin-walled vessels. Residual stress from welding is a primary factor in cases of austenitic stainless steel pressure vessel failure. In this paper, on the basis of Visual Environment 10.0 finite element simulation technology, the residual stress resulting from different welding strength matching coefficients (0.8, 1, 1.2, 1.4) for two S30408 plates welded with three-pass butt welds is calculated according to thermal elastoplastic theory. In addition, the stress field was calculated under a loading as high as 410 MPa and after the load was released. Path 1 was set to analyze stress along the welding line, and path 2 was set to analyze stress normal to the welding line. The welding strength matching coefficient strongly affected both the longitudinal residual stress (center of path 1) and the transverse residual stress (both ends of path 1) after the welding was completed. However, the coefficient had little effect on the longitudinal and transverse residual stress of path 2. Under the loading of 410 MPa, the longitudinal and transverse stress decreased and the stress distribution, with different welding strength matching coefficients, was less diverse. After the load was released, longitudinal and transverse stress distribution for both path 1 and path 2 decreased to a low level. Cold stretching could reduce the effect of residual stress to various degrees. Transverse strain along the stretching direction was also taken into consideration. The experimental results validated the reliability of the partial simulation.
机译：奥氏体不锈钢广泛应用于压力容器，用于储存和运输液体气体，例如液氮，液氧和液态氢气。低温压力容器制造使用冷拉伸技术，依靠焊接关节性能依赖，构建轻质和薄壁的容器。焊接的残余应力是奥氏体不锈钢压力容器衰竭情况的主要因素。本文根据可视环境10.0有限元仿真技术，根据不同的焊接强度匹配系数（0.8,1,1,1，1.2,14），焊接有三侧对接焊缝的两个S30408板产生的剩余应力热弹性理论。另外，应力场在负载下计算，高达410MPa，释放负载后。路径1被设定为沿焊接线分析应力，并且将路径2设定为分析垂直于焊接线的应力。焊接强度匹配系数强烈影响焊接完成后的纵向残余应力（路径1）和横向残余应力（路径1的两端）。然而，系数对路径2的纵向和横向残余应力几乎没有效果。在410MPa的负载下，纵向和横向应力降低，并且具有不同焊接强度匹配系数的应力分布较小。在释放负载之后，对于路径1和路径2的纵向和横向应力分布减小到低电平。冷拉伸可以降低残余应力对各种程度的影响。还考虑了沿拉伸方向的横向应变。实验结果验证了部分仿真的可靠性。

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