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利用SYSWELD有限元软件、采用双椭球热源模型,模拟了Q345/304异种钢平板焊接在空气环境和水环境中的焊接过程温度场和残余应力场,得到了不同时刻水环境和空气环境中工件的焊接温度场分布和节点的温度变化曲线、试件冷却后的焊接线残余应力场分布曲线。对比分析了异种钢焊接在水环境与空气环境中的差异。模拟结果表明,不论在水环境还是在空气环境中不锈钢一侧的加热速度和散热速度都要小于低合金钢一侧,水环境中焊接试件的焊接线上的热循环曲线覆盖面积明显比空气环境中的试件小,焊接线上的残余应力要大于空气环境中的焊接试件。
By using the finite element software SYSWELD, the dual ellipsoidal heat source model was used to simulate the temperature field and the residual stress field during the welding of Q345 / 304 dissimilar steel plates in air and water environments. The distribution of the welding temperature field and the temperature change curve of the node, the distribution curve of the residual stress field of the welding wire after the cooling of the specimen. The differences of dissimilar steel welding between water environment and air environment are compared and analyzed. The simulation results show that the heating rate and cooling rate on the stainless steel side are lower than those on the low alloy steel side both in water environment and in air environment. The thermal cycling curve coverage area on the welding line of welding specimen in water environment is obviously more than that of air The specimen in the environment is small, the residual stress on the welding line is greater than the welding specimen in the air environment.