Abstract：Based on the butt joint of thin-walled aluminum alloy pipe, according to the practical situation, three-dimensional thermal, metallurgical and mechanical finite element model was established. The temperature field during welding process, axial and hoop residual stresses of circumferential welds incorporating metallurgical phase transformation were simulated by using SYSWELD software. The model was accurately predict the welding residual stresses and the results coincided with experiment. In addition, the effects of pipe diameter on residual stresses were investigated. The results showed that affected metallurgical phase transformation on the maximum axial tensile stress and maximum hoop tensile stress and compressive stress, and models with metallurgical phase transformation can simulate axial and hoop stresses more accurately; considering phase transformation, the residual stresses increased with increasing the radius, and residual stresses with different radii have a similar trend.
 CAAS J,PICN R,PARIS F,et al. A simplified numerical analysis of residual stresses in aluminum welded plates[J]. Computers and Structures,1996,58(1):59-69. TENG TSO-LIANG,CHANG PENG-HSIANG. Three-dimensional thermo-mechanical analysis of circumferentially welded thin walled pipes[J]. International Journal of Pressure Vessels and Piping,1998,75(3):237-247. ARTEM P. Computer simulation of residual stress and distortion of thick plates in multi-electrode submerged arc welding,their mitigation techniques. Norway: Norwegian University of Science and Technology,2001. CHENG C M. Butt-welding residual stress of heat treatable aluminum alloys[J].Journal of Materials Science and Technology,2007,23(2):217-222. ZAIN-UL-ABDEIN M,NLIAS D,JULLIEN J F,et al. Prediction of laser beam welding-induced distortions and residual stresses by numerical simulation for aeronautic application[J].Journal of Materials Processing Technology,2009,209(6):2907-2917. ZAIN-UL-ABDEIN M,NLIAS D,JULLIEN J F,et al. Experimental investigation and finite element simulation of laser beam welding induced residual stresses and distortions in thin sheets of AA 6056-T4[J].Materials Science and Engineering:A,2010,527(12):3025-3039. DUNCAN CAMILLERI,TUGRUL COMLEKCI,THOMAS G F GRAY. Thermal distortion of stiffened plates due to fillet welds computational and experimental investigation[J]. Journal of Thermal Stresses,2006,29(2):111-137. ZAIN-UL-ABDEIN M,NLIAS D,JULLIEN J F,et al. Thermo-mechanical analysis of laser beam welding of thin plate with complex boundary conditions[J].International Journal of Material Forming,2008,1(S1):1063-1066. MURPHY A,MCCUNE W,QUINN D,et al. The characterisation of friction stir welding process effects on stiffened panel buckling performance[J].Thin-Walled Structures,2007,45(3):339-351. SCHENK T,RICHARDSON I M,KRASKA M,et al. A study on the influence of clamping on welding distortion [J]. Computational Materials Science,2009,45(4):999-1005. 吴甦,赵海燕,王煜,等.高能束焊接数值模拟中的新型热源模型[J].焊接学报,2004,25(1):91-94. PIOTR LACKI,KONRAD ADAMUS. Numerical simulation of the electron beam welding process[J].Computers and Structures,2011,89(11-12):977-985. YANG Shang-lei,LUO Bin,LV Ren-yuan,et al.Microstructures and properties of MIG joint of AA5083 aluminum alloy used in high-speed vehicle[J].Advanced Science Letters,2011,4(3):1098-1102. EL-AHMAR W. Robustesse de la simulation numérique du soudage TIG de structures 3D en acier 316L. France:Institut National des Sciences Appliquées (INSA),2007.