工艺参数对分流组合模挤压6005A铝合金型材焊合质量的影响

Effect of extrusion parameters on the welding quality of 6005A aluminum hollow profiles with porthole dies

采用正交试验法分析了挤压工艺对轨道交通车体用6005A铝合金空心型材焊合质量的影响,并通过低倍组织检验、焊合线扩口检验、电子显微观察和能谱分析等手段,对焊合不良的形成机制进行研究。结果表明,挤压比对型材焊合质量的影响最大,其次是挤压速度,最后是铸锭温度。模腔内金属的焊合压力及焊合时间不足是焊合不良的主要原因。通过增大挤压比并优化工艺参数可以避免焊合不良,同时获得力学性能优良的轨道交通用型材。

The effects of extrusion processes on the welding quality of 6005A aluminum al- loy hollow profiles for rail transit were investigated with the orthogonal test method. Addition- ally, the macrostructure, microstructure inspection and EDX analysis, as well as the divid- ing-wall expansion test of the extrusion welds were conducted, which allow the formation mechanism of the poor welding quality of the hollow profiles to be explored. The results re- veal that the extrusion ratio have the most significant influence on the welding quality of hol- low profiles, followed by the extrusion speed, and at last the extrusion temperature. Poor welding quality is caused by the insufficient welding pressure and welding time. The optimal welding quality and mechanical properties can be achieved by the increase of extrusion ratio and optimization of extrusion parameters o