The Study on Welding Temperature and Residual Stress of S15C/SUS304 Dissimilar Metal Butt Joint

• Main Authors: Tsai, Yao-Long, 蔡曜隆
• Other Authors: Chou, Chang-Pin
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/78217246054432536247

博士 === 國立交通大學 === 機械工程學系 === 98 === This study explored the difference in the distribution of the temperature and residual stresses of both the similar and dissimilar weld metal joints. Autogenous GTA welding process was conducted on stainless steel 304 and structural steels S15C. The hole-drilling method was used to experimentally measure the residual stress. The thermo-elastic-plastic theory was employed in the finite element model with temperature dependent material properties. The results showed that using 54% thermal efficiency of GTA welding can accurately simulate the welding temperature distributions. Under the same welding parameters, results showed that the maximum longitudinal tensile residual stresses increase linearly with the increase of the thermal expansion coefficient and the increase of the yield stress. The length of the tensile residual stress zone linearly decreases with the increase of the thermal conductivity. Finally, based on the relationship between material properties and welding residual stresses, a very useful and effective prediction equation is developed and verified in this study.