Abstract: Based on the thermal-elastic-plastic theory, the welding residual deformation’s numerical simulation was done with APDL and the field tracking measurement was also made with the side beam. It was concluded that the computation result  is basically consistent with the measured data and the error is within 6%. On the basis of the numerical simulation model, and combined with the scheme of reverse deformation, multi-layer optimizing computer was utilized, the optimization analysis of the reverse deformation was done with numerical simulation model, the optimum scheme was obtained. Compared with the welding without reverse deformation, the optimum scheme can make bend deformation reduce about 65%. The optimum scheme provides reliable theoretical references for controlling welding residual deformation and selecting the welding technology and determining deformation reserved.

Key words: welding deformation, numerical simulation, one by one reverse deformation method； optimization analysis