摘要
采用搅拌针长度相同而形状不同的搅拌头对3mm厚的LY12CZ铝合金进行了搅拌摩擦焊搭接试验。结果表明,表面带有螺纹的搅拌针使板材间的搭接界面在厚度方向上发生迁移,左螺纹使邻近搅拌针的塑化金属向下迁移,在搅拌针端部积聚,挤压周边金属向上运动,导致搭接界面向上迁移;右螺纹使邻近搅拌针的塑化金属向上迁移,在搅拌针根部积聚并受轴肩作用,挤压周边金属向下运动,导致搭接界面向下迁移。若搅拌针表面是光滑的,搭接界面在厚度方向上的迁移减小,但返回边界面向焊缝中心延伸的程度增大。
The friction stir lap welding of LY12CZ aluminum alloy plates with 3 mm thickness was conducted using several pins with the same length and different geometry,the influence of pin geometry on interface migration of friction stir lap welds was investigated.The results show that the screw thread on the tool made interface migrates in thickness direction,the counter-clockwise screw thread drives the plasticized metal closed to the stir pin to migrate downwards,the plasticized metal accumulates at the tip of stir pin and extruded circumambient metal,then the interfaces move upwards.The clockwise screw thread drives the plasticized metal to migrate upwords,the plasticized metal accumulates at the root of stir pin and extrudes metal under the shoulder,then the interfaces move downwards.If the surface of the stir pin is smooth,the migration of interface in the thickness direction reduces,but the interface spreading to the weld is serious.
出处
《热加工工艺》
CSCD
北大核心
2011年第1期119-122,共4页
Hot Working Technology
基金
国家自然科学基金项目(50875119)
航空科学基金项目(20081156009)
江西省自然科学基金项目(2008GQC0039)
江西省教育厅基金资助项目(GJJ09187)
关键词
搅拌摩擦焊
搅拌针形状
搭接
界面迁移
friction stir welding
pin geometry
lap joint
interface migration
