Finite Element Simulation of High Heat Input Welding Process for Ship Plate Steel

船板钢的大线能量焊接技术是推动海洋工程发展的关键技术。准确预测不同焊接参数下的温度、应力变化，对焊接工艺的制定和优化有重要的指导意义。本文基于ABAQUS有限元软件，建立了三维有限元焊接模型，对EH36船板钢单丝300 kJ/cm大线能量焊接过程中的温度场和应力场进行了计算。结果表明，随着焊接速度提高，热影响区温度降低，焊缝和热影响区缩小；残余应力的数值随焊接速度变化不大，但分布有明显不同。The high heat input welding technology for ship plate steel is a key technology driving the development of marine engineering. Accurately predicting the temperature and stress changes under different welding parameters is of great guiding significance for the formulation and optimization of welding processes. In this paper, based on the ABAQUS finite element software, a three-dimensional finite element welding model was established to calculate the temperature field and stress field during the single-wire high heat input welding process (300 kJ/cm) of EH36 ship plate steel. The results show that as the welding speed increases, the temperature in the heat-affected zone decreases, and the weld and heat-affected zone shrink. The value of the residual stress does not change much with the welding speed, but the distribution is significantly different.