摘要
采用搅拌摩擦焊焊接了5083-H111合金,并优化了焊接工艺,对优化工艺条件下的焊接接头进行组织观察和性能测试,结果表明:当采用主轴倾角2.5°、旋转速度600r/min、焊接速度300mm/min(ω/v=2)的工艺参数进行焊接时,焊接接头的拉伸性能较好,抗拉强度为310.71 MPa、屈服强度为211.09 MPa、延伸率5.96%,抗拉强度达到母材的84.54%,断裂发生在前进侧的热机影响区;焊核区组织为细小的等轴晶,晶粒度约为10级;焊接热输入导致焊接接头中存在一段软化区,距焊缝上表面1.5 mm、下表面1.5 mm处的软化区宽度分别为11 mm和7 mm,且后退侧的硬度低于前进侧。
Abstract：5083-HIll aluminum alloy was welded by friction stir welding （FSW）,and the welding process was optimized. The microstructure and mechanical properties of the welding joint under optimum process were researched. The result showed that： when rotation speed is 600rmp,welding speed is 300mm/min （ω/v=2）,the inclination of spindle is 2.5？,the tensile property of the welded joints is best. The tensile strength is 310.71MPa,the yield strength is 211.09MPa,and the elongation is 5.96%. The tensile strength is about 84.54% of the base material,and the fracture occurs at the thermo-mechanieally affected zone （TMAZ） of the advancing side （AS）. The average grain degree of equiaxed grain at weld nugget zone （WNZ） is about 10. The existence of softening zone is because of the heat input. The width of softening zone is about 1 lmm （ 1.5ram below the upper surface） and 7ram （ 1.5mm above the bottom ）,and the hardness of the retreating side （RS） is lower than the advancing side （AS）.
出处
《电焊机》
北大核心
2014年第4期58-61,共4页
Electric Welding Machine
关键词
5083铝合金
搅拌摩擦焊
拉伸
硬度
微观组织
5083 aluminum alloy
friction stir welding
tensile property
hardness
microstructure
