60mm厚度6061-T6铝合金板搅拌摩擦焊接接头微观组织与力学性能

Microstructure and Mechanical Property Analysis on Double-sided Friction Stir Welding Joints of 60mm 6061-T6 Aluminum Alloy Plate

采用搅拌摩擦焊接方法对6061-T6铝合金板进行了60mm双面对接焊实验,研究了搅拌摩擦焊接接头的微观组织与力学性能,结果表明:焊缝区微观组织沿厚度方向发生了不同程度的改变,焊接接头强度达到218MPa,为母材强度的70%;焊接热循环引发的金属强化相"重固溶"和"过时效"是接头力学性能下降的重要原因,其中前进侧热机影响区为焊缝薄弱环节。

Double-sided friction stir welding was applied to connection of 6061-T6 aluminum alloy plates,the microstructure and mechanical properties of the joints were investigated.The results show that the microstructure undergoes different changes in the through-thickness direction,the tensile strength of the joint reaches 218MPa,70% that of the parent material.The re-solution and over-aging of the strengthening phases caused by welding thermal cycle have a great effect on the strength degradation,and the thermal mechanical affected zone of the advancing side is the welding weakness.