Abstract:  In order to predict residual stress under different welding parameters and further optimize the welding procedure, the welding residual stress of anchor pipe was studied by numerical simulation and experimental comparison. The welding residual stress of Tjoint welding specimen was simulated with the finite element software ANSYS, and the accuracy of the numerical method was verified by comparing with the measured stress value. On this basis, the welding residual stress of anchor pipe was compared and analyzed in different welding process parameters like welding voltage, welding current and welding speed by simulation. The results show that welding residual stress of anchor pipe is positively correlated with welding voltage and welding current, and the longitudinal residual peak stress at root is greater influenced by welding current. Welding residual stress is negatively correlated with welding speed, which means when welding speed is higher, the longitudinal residual stress along the weld direction reduces obviously and its distribution is more uniform. When welding speed reaches 5mm/s, anchor pipe is not fully welded and the position of peak stress moves, so welding speed can be used as the main control parameter. Based on the results, the simplified residual stress distribution model of anchor pipe section is established, providing a reference for research of the welding residual stress.

Key words:  anchor pipe; welding residual stress; welding process parameters; numerical simulation; experimental comparison