Effect of Heat Input on Welding Thermal Cycle and Residual Stress of V-joints at Different Positions of Motor Bracket

A tubular motor bracket model with six V-joints was established with a nonlinear finite element software Marc.The influence of heat input on the thermal cycle at the arcing end and the residual stress in welds of six V-joints were simulated and studied.The results show that the higher the heat input, the higher the peak temperature at the arcing end, and the more uniform the heat of the joint during heating and cooling processes.The heat input had a small effect on the welding residual stress at the front and end of the welds.For the middle of the welds, the greater the heat input, the smaller the welding residual stress; except for the joint II, the residual stresses in the middle of welds of other joints were all tensile stresses.