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Size effect on residual stress in low transformation temperature welded joints

机译：低变换温度焊接接头中残余应力的尺寸影响

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摘要

It has been reported that low transformation temperature (LTT) weld metals are beneficial to generation of compressive residual stress around weld zone. In this study, the relationship among residual stress, size effect of LTT welded joints with different plate width and thickness as well as martensite start (Ms) temperatures was investigated by experimental and finite-element analysis. It was found that heat dissipation and thermal expansion coefficient of LTT weld metal had a significant impact on residual stress. Welded joint with a small plate width led to greater compressive residual stresses in the LTT weld, which was due to the lower heat dissipation and smaller thermal expansion coefficient of the LTT weld metal in due course of cooling process. Additionally, the finite-element analysis revealed that increasing plate width mainly affected the longitudinal residual stress, while increasing the plate thickness influenced all the residual stress components in the LTT weld. Furthermore, the LTT weld with a lower Ms temperature of 191 degrees C resulted in greater compressive residual stresses, and was less sensitive to the LTT joint size, as against the Ms temperature of 398 degrees C.
机译：据报道，低变换温度（LTT）焊接金属有利于焊接区周围的压缩残余应力的产生。在该研究中，通过实验和有限元分析研究了LTT焊接接头的残余应力，LTT焊接接头的尺寸效应，以及马氏体开始（MS）温度。发现LTT焊接金属的散热和热膨胀系数对残余应力产生了显着影响。 LTT焊接中具有小板宽度的焊接接头导致LTT焊缝中的更大压缩残余应力，这是由于在冷却过程的适当过程中LTT焊接金属的散热和较小的热膨胀系数。另外，有限元分析显示，增加板宽度主要影响纵向残余应力，同时增加板厚影响LTT焊缝中的所有残余应力分量。此外，具有191摄氏度的较低MS温度的LTT焊接导致更大的压缩残余应力，并且对LTT接头尺寸的敏感性较小，与398摄氏度的MS温度相比。

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