摘要
轴肩的偏心挤压在铝合金搅拌摩擦接头弧纹形成过程中起到了决定性作用.搅拌摩擦连接弧纹形成的过程是搅拌头偏心产生的长轴挤压软化的金属材料的过程,在长轴挤压下将产生弧纹的弧峰,两次弧峰间将产生弧谷,并且弧纹的产生可以进行数值表征.利用数值仿真对无针搅拌头进行连接过程的模拟可以得到弧纹,并利用试验方法进行了有针和无针搅拌摩擦焊接的对比.结果表明,无针的搅拌头也能产生弧纹,且弧纹的轮廓与有针时相同;弧纹的形成主要是搅拌头轴肩挤压的作用;搅拌头的前进速度越大,搅拌头的旋转频率越慢,则接头的弧纹间距将会越大;弧纹在后退侧形成的夹角比前进侧形成的夹角大.
The eccentric squeeze by shoulder plays a decisive role in arc lines formation process of aluminum alloy friction stir welding. The arc lines formsbecause of the softened material squeezed by long axis which generates by eccentric of tool in joint area. Peaks of arc lines form by squeezing of long axis of tool,and there are valleys of arc lines between two peaks of arc lines. The eccentric extrusion flow model was proposed. Formation of arc lines can be characterized by numerical model. Friction stir welding process by using tool without pin can get arc lines by numerical simulation way. Friction stir joining processes withand without pin tool were contrasted by experimental methods. Research shows that arc lines form in the process and the contour of arc lines without pin is the same as that with pin. The eccentric squeeze by shoulder plays a decisive role in arc lines forming process. Faster advance speed and slower rotation speed of tool lead to the long distance between the arc lines. Angle of arc line formed in the retreating side is larger than that in the advancing side.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第7期43-46,115,共5页
Transactions of The China Welding Institution
基金
国家自然基金资助项目(51175255)
江苏省普通高校研究生科研创新计划资助项目(CXZZ13_0152)
中央高校基本科研业务费专项资金资助
江苏省高校优势学科建设工程资助
江苏省博士后科研资助计划(No.1302070B)
关键词
弧纹
偏心
挤压
搅拌摩擦连接
Arc line
Eccentricity
Extrusion
friction stir welding
