6061-T6铝合金MIG焊接头微区拉伸性能表征及接头拉伸性能的有限元仿真

建立了6061-T6铝合金MIG焊接接头微区拉伸性能测试的高精度等效试验方法;采用有限元模拟了焊接过程的温度变化情况,建立了温度与接头各微区拉伸性能的关系;获得了可表征接头各微区材料性能的参数,验证了将接头等效为不同热状态材料所建立的精细模型对接头性能预测的可靠性。结果表明:微区温度场、焊缝熔池形貌和拉伸性能的仿真模拟与试验结果的吻合性较好;采用等效焊接接头的拉伸仿真模拟与试验的峰值力的误差仅为0.1%,断裂失效时的位移误差仅为5.7%,根据温度分布将热影响区网格划分为不同热状态材料可以有效预测焊接接头的拉伸性能。

Tensile Properties Characterization of Micro-zone of 6061-T6 Aluminum Alloy MIG Welded Joint and Finite Element Simulation of Tensile Properties of Joint

A high precision equivalent experimental method for measuring micro-zone tensile properties of 6061-T6 aluminum alloy MIG welded joint was established.The temperature changed during the welding process was simulated by finite element,and relationship between temperature and tensile properties of joint micro-zone was established.The parameters that could characterize properties of each micro-zone material of joint was obtained,and verified that joint was equivalent to materials in different thermal states to established the fine model for predicting the properties of joint was reliability.The results show that the simulation of the temperature field,weld pool morphology and tensile properties were in good agreement with the experimental results.The error of the peak force between simulation by eguivalent weld joint and experiment was only 0.1%,and the displacement error of fracture failure was only 5.7%.The heat affected zone grid was divided into different thermal state materials on the basis of temperature distribution could effectively predict tensile properties of weld joint.