Stress and strain analysis of the flame correction process of aluminum alloy ship hulls

In order to solve the problem of low efficiency of conventional flame correction, the expansion and tension flame correction technology was proposed in this paper. Before welding deformation and adjustment, the expansion and tension tool was used to reversely apply the tension and forced deformation, and the flame adjustment operation was carried out at the same time. The actual verification showed that the efficiency of the expansion and tension process correction was 2. 5 times that of conventional flame correction. Numerical calculations were used to simulate the stress and deformation transfer in welding, stretching, and orthopedic processes. The calculation results showed that conventional correction reduced the longitudinal tensile stress level of the original weld and reduced the original flexural deformation compressive stress level of the frame center. The flame correction under the condition of expansion and tension had a better compressive stress reduction effect, which could effectively increase the flame channel and compression plastic strain zone around it, so as to obtain a better orthopedic effect.