装载机虎头存在突出的焊接变形问题，为了减小焊接变形，得到最优焊接顺序方案，利用热弹塑性有限元方法建立了有限元模型，并对装载机后车架虎头结构焊接变形进行了数值模拟计算．分析了虎头结构的四种变形趋势，定量地对比了不同焊接顺序下虎头结构各部位的最大焊接变形点，得到优化的焊接顺序．该顺序模拟结果：侧臂最大挠曲变形量为8 mm，框架扭转变形量为4 mm，侧臂收缩变形为12 mm．对预测的最佳焊接顺序下的变形模拟值和实测值进行了对比，结果表明，两者吻合良好．
Loader tiger exists a prominent question of welding deformation. To reduce this welding deformation and get the optimal scheme of tiger shaped structure welding sequence, the numerical simulation of welding deformation of tiger?shaped structure for rear frame of loader was conducted using thermo elastic?plastic method. The finite element model was established to analyze four kinds of deformation trend of tiger shaped structure and quantitatively calculate the distortion of different welding sequence, the optimal welding sequence of the whole structure was obtained. The results show that the maximum deflection distortion of side arm was 8 mm,the torsional deformation of frame was 4 mm,the in?plane shrinkage of side arm was 12 mm. The simulated values and measured values are compared under the optimal welding sequence, and the results show that they are in good agreement.
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