摘要
采用搅拌摩擦焊方法对厚度为6mm的7A60超高强铝合金进行了焊接试验,分别测试了搅拌头形状、工艺参数搅拌摩擦焊接头对抗拉强度的影响。结果表明:搅拌头的形状对焊缝接头强度有一定的影响;在旋转速度为300r/min,且焊接速度为200mm/min时,可以获得较好的焊接性能,抗拉强度可以达到488.69MPa,为母材的75%;接头显微硬度最低值出现在焊接热影响区而不在焊核区,主要是焊核区经过动态再结晶形成了细小的等轴晶粒所致;断口形貌分析显示,接头断裂模式为脆性和韧性的混合型断裂。
Friction stir welds of 7A60 aluminum plate of 6 mm thickness are completed in a single pass welding. The influence of welding tool and parameters on the tensile strength are investigated. The experiment results demonstrate that the tensile strength is affected by welding tool figuration .When the rotating speed is 300 r/min and the wielding speed is 200 mm /min , the good weld is achieved ,and the tensile strength of the joint reaches 488.69 MPa, about 75% of the ultimate strength of the base material with higher welding efficiency. Furthermore ,the minimal micro-hardness locates on the heating affected zone while doesn’t locate on the weld nugget, which primarily results from fine grain equiaxed structure developed by dynamic recrystallization. The fracture analysis shows that the fracture mode of the joint is brittle / ductile mixed fracture.
出处
《航空制造技术》
北大核心
2012年第21期73-78,共6页
Aeronautical Manufacturing Technology
基金
航空科学重点基金项目(2009ZE25007)资助
关键词
搅拌摩擦焊
抗拉强度
工艺参数
7A60铝合金
Friction stir welding Tensile strength Process parameter 7A60 aluminum alloy
