铝合金型材分流模挤压过程焊合行为的研究进展

Research progress on welding behavior during porthole die extrusion process for aluminum alloy profile

空心铝合金型材分流模挤压过程中,不可避免地会在整个型材长度上形成若干条纵向焊缝,焊合质量的优劣对型材的整体力学性能影响很大。综述了铝合金型材分流焊合行为及其机理的研究进展,介绍了焊合室、分流孔、分流桥、工作带等模具结构和挤压速度、棒料温度等工艺参数对焊合质量的影响规律,总结分析了现有K准则、Q准则、J准则及其对焊合质量的预测方法,阐述了铝合金分流焊合机理及其微观组织演变规律。最后,展望了铝合金型材分流焊合挤压过程的研究方向,指出应在复杂大断面铝合金型材焊合质量控制、铝锂合金挤压过程焊合行为等方面加强相关研究。

During porthole die extrusion process of hollow aluminum alloy profile,several longitudinal weld seams are inevitably formed along the whole length of profile,and the welding quality has significant influence on the overall mechanical properties of profile. Therefore,the research progress on welding behavior of aluminum alloy profile extruded by porthole die and its mechanism were reviewed,and the influences of die structure such as welding chamber,porthole,bridge and bearing,and process parameters such as extrusion speed and billet temperature on the welding quality were introduced. Then,the current K criteria,Q criteria,J criteria and welding quality prediction method were summarized and analyzed,and the welding mechanism of aluminum alloy profile extruded by porthole die and microstructure evolution rules were expounded. Finally,the future research direction about the welding behavior for aluminum alloy profile extruded by porthole die was discussed,and it was pointed out that the control of welding quality for large scale and complex cross-section aluminum alloy profile and the welding behavior of alloy Al-Li during the extrusion process should be comprehensively studied.