高强铝合金的搅拌摩擦焊工艺参数研究

Study on FSW Process Parameters of High Strength Aluminum Alloy

采用搅拌摩擦焊方法对7022铝合金进行了焊接试验。试验结果表明:n/v值的大小体现了搅拌头旋转速度n与焊接速度v的匹配程度,反映了焊接单位长度焊缝所产生的热量多少和搅拌头的搅拌次数,直接反映其焊缝性能的优劣。当n/v=4时,二者的匹配程度最高,焊缝抗拉强度及屈服强度各自为母材的102.5%、99.10%,焊核区微观组织为形状均匀、粒度细小而致密的等轴再结晶晶粒,焊缝性能达到最佳状态;当n/v值在3～5变化时,其焊缝性能良好。

The friction-stir-welding of 7022 high-strength aluminum plate was completed. The experiment results show that the value of the n/v embodies the mixing head rotation speed and welding speed matching degree, which can reflect the welding unit length weld heat generated by the number and mixing head agitation frequency, directly reflect the performance of friction stir weld quality. When n/v=4, the matching degree is highest, the weld tensile strength and yield strength of the matrix metal is respectively 102.5%, 99.10%. The microstructure of welding nuclear zone is uniform shape, particle size in small and compact and shaft recrystallization grain, the weld seam performance can achieve the best condition; when n/v value is in 3-5, the weld seam performance is good.