Study on Residual Stress Reduction by Using Phase Transformation Phenomena in Welding Material : Studies on Numerical Simulation of Temperature, Microstructure, and Thermal Stress Histories during Welding Process and Their Application to Welded Structures (Report 2)
Study on Residual Stress Reduction by Using Phase Transformation Phenomena in Welding Material : Studies on Numerical Simulation of Temperature, Microstructure, and Thermal Stress Histories during Welding Process and Their Application to Welded Structures (Report 2)
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利用焊接材料相变现象减少残余应力的研究：焊接过程中温度、微观结构和热应力历史的数值模拟及其在焊接结构中的应用研究（报告2）
DOI：
10.2207/qjjws.23.112
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Toyoda
中科院分区：
文献类型：
--
作者：
M. Mochizuki;S. Matsushima;Y. Morikage;T. Kubo;M. Toyoda
采用一种具有低温相变特性的新型焊缝金属，对焊接接头残余应力进行了数值分析。在所开发的焊接材料中含有10%的镍和10%的铬，以产生低温下的马氏体相变特性并产生压缩残余应力。以板与加强筋的角焊缝连接为例，进行了考虑相变耦合效应的热弹塑性有限元分析。在焊接过程中，采用有限元的逐步沉积法来考虑移动热源。计算的残余应力分布与应变片测量值基本吻合。残余压应力沿焊缝的纵向和横向分布。研究了焊缝金属材料和焊接道次顺序对残余应力的影响。与传统焊丝相比，无论焊接熔敷顺序如何，使用低温相变焊丝都能降低焊趾和焊根的残余应力。结果表明，具有低温相变特性的焊缝金属能有效地降低焊缝附近的残余应力。
Residual stress in welded joints by using a new weld metal with the property of low-temperature phase transformation is numerically analyzed. 10 % Nickel and 10 % Chromium are involved in the developed welding material for producing the property of martensitic phase transformation at a low temperature and for generating compressive residual stress. A fillet-welded joint between plate and stiffener is used for the numerical simulation of the thermal elastic-plastic finite-element analysis with coupling phase transformation effect. Moving heat source is considered by using the gradual deposition of the finite-element during welding process. Distribution of the computed residual stress mostly agrees with the measuring values by strain gauge. Compressive residual stress distributes in the weld metal for both longitudinal and transverse directions with weld line. The effects of the material of weld metal and welding pass sequence on residual stress are then investigated. Residual stresses on the weld toe and root are improved lower by using the low-temperature transformation weld wire than the conventional one, regardless of the sequence of welding deposition. It is found that the weld metal with property of low-temperature phase transformation is effective to reduce residual stress near weld metal.