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利用三维有限元分析软件SYSWELD,分析了低合金高强钢单面GTAW和双面GTAW对接接头温度场和应力场。结果表明:在保证焊件焊透的情况下,单面GTAW熔合区和热影响区内的峰值温度较双面GTAW低;两种焊法的残余应力均是焊缝中间位置较端部大,焊接线附近和熔合区内产生高值残余拉应力;单面GTAW在焊缝及其附近区域的残余应力比双面GTAW的大。
Using the three-dimensional finite element analysis software SYSWELD, the temperature field and the stress field of low-alloy high-strength steel single-sided GTAW and double-sided GTAW butt joint were analyzed. The results show that the peak temperature of single-side GTAW fusion zone and heat-affected zone is lower than that of double-sided GTAW under the condition of welding penetration. The residual stresses of the two welding methods are all larger than the middle part of the weld, The residual tensile stress is high in the vicinity of the welding line and in the fusion zone. The residual stress of the single-side GTAW in the weld and its vicinity is larger than that of the double-sided GTAW.