A6N01S-T5铝合金焊接软化行为及数值模拟

基于A6N01S-T5铝合金焊接接头显微硬度试验和微观组织分析，研究A6N01S-T5铝合金焊接接头软化特征，根据焊接接头不同区域的焊接温度及显微硬度，建立了A6N01S-T5铝合金软化模型.针对高速列车车顶焊接过程数值模拟，开发了基于平均温度曲线法的焊接快速数值模拟方法，并通过典型焊接接头试验验证.结果表明,平均温度曲线法可以替代移动热源进行焊接过程模拟.基于A6N01S-T5铝合金软化模型及平均温度曲线法，模拟高速列车车顶焊接过程，计算的车顶焊接变形与实测值比较吻合.

Welding softening character and numerical simulation of A6N01S-T5 aluminum alloy

Based on micro-hardness tests and microstructure analysis of welded joints, welding softening character of A6N01S-T5 aluminum alloy were studied. According to welding temperatures and micro-hardness in different regions of the welded joint, the softening model of A6N01S-T5 aluminum alloy was established. In order to simulate the welding process of train roof in high-speed train, a quick welding simulation method was developed based on an average temperature curve method. A welding experiment of typical welded joints was carried out. The welding process was simulated with a moving heat source method and the average temperature curve method, respectively. The results show that compared with the measured deformation and the residual stress, the average temperature method can replace the moving heat source method to simulate the welding process. The softening model and the average temperature curve method were applied to simulate the welding process of roof of A6N01S-T5 aluminum alloy train, a well agreement was obtained between the calculated and measured values of the welding distortion in the train roof.