Residual Stress Analysis of TIG Welding Process of Thin-Walled Stainless Steel and Red Copper

Abstract:

The connecting pipe in solar hot water system is made by TIG welding of thin-walled stainless steel and copper. As the welding of stainless steel and copper belongs to dissimilar metal welding and their physical properties are very different, thus the welding process is difficult and it is likely to cause a variety of defects in the welding process. In this paper, ANSYS software is used to simulate the welding process of stainless steel and copper, and the residual stress distributions in the welding process are obtained. The results show that: at the end of the welding cooling, large residual stress (253MPa) is remained in the junction area of the starting and ending position of welding, which is close to the yield strength of material at the same temperature. Therefore, there will be greater deformation in the junction area and more cracks inside. Meanwhile, the stress distributions of stainless steel and copper tubes in the welding process are greatly different. Different volume changes emerge in two tubes, which are harmful to the welding seam and also leads to the unfitness of dimensional tolerance of welding parts, resulting in the scrapping of welding parts. The results provide references and theoretical basis for the welding technology of dissimilar materials.

• Periodical: Advanced Materials Research (Volumes 834-836)
• Pages: 1553-1556
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.834-836.1553
• Online since: October 2013
• Authors: Han Wu Liu, Lei Huang, Xiang Guo, Yu Long Lv
• Keywords: Red Copper, Residual Stress, Stainless Steel (SS), Stress Distribution, Thin-Wall, TIG Welding

References

[1] Van-Xuan Tran, Jwo Pan. Analytical stress intensity factor solutions for resistance and friction stir spot welds in lap-shear specimens of different materials and thickness. Engineering Fracture Mechanics, 2010, 77(14): 2611-2639.

DOI: 10.1016/j.engfracmech.2010.06.022

[2] B. Binda, E. Capello, B. Previtali. A semi-empirical model of the temperature field in the AISI 304 laser welding. Journal of Materials Processing Technology. 2004, (156): 1235-1241.

DOI: 10.1016/j.jmatprotec.2004.04.145

[3] Dean Deng, Shoichi Kiyoshima. Numerical simulation of residual stresses induced by laser beam welding in a SUS316 stainless steel pipe with considering initial residual stress influences. Nuclear Engineering and Design, 2010, 240(1): 688-696.

DOI: 10.1016/j.nucengdes.2009.11.049

[4] Limmaneevichitr C, Kou S. Visualization of Marangoni convection in simulated weld pools containing a surface-active agen. Welding Journal, 2000, 79 (11): 324-330.

[5] P. Zeng, Y. Gao, L.P. Lei. Welding process simulation under varying temperatures and constraints. Materials Science and Engineering, 2009, 499 (1): 287-292.

DOI: 10.1016/j.msea.2007.09.101

[6] Dean Deng. FEM prediction of welding residual stress and distortion in carbon steel considering phase transformation effects. Materials and Design, 2009, 30: 359-366.

DOI: 10.1016/j.matdes.2008.04.052

[7] X.K. Zhu, Y.J. Chao. Effects of temperature-dependent material properties on welding simulation. Computers & Structures, 2002, 80 (11): 967-976.

DOI: 10.1016/s0045-7949(02)00040-8