Optimization of welding scheme for side beam of low pressure cylinder frame base on local-global mapping model

Based on the local-global mapping model of the side-beam of low-pressure cylinder frame, the welding sequence of Q235-C steel was studied by finite element method, and the welding residual deformation under different welding schemes was obtained. By comparison, it can be seen that the option 2 from the Circumferential-radial welding is superior to option 1 of the circumferential-radial simultaneous welding. It is also superior to option 3 and option 4, which are radial-circumferential welding and radial-circumferential-radial welding, respectively. In addition, the whole process predicts and controls the welding deformation by numerical simulation, which provides a numerical basis for reducing and controlling the welding deformation of the side beam. The optimal welding sequence with the minimum welding deformation is given during the actual welding process.