搅拌针端部形状对FSW接头根部金属流动行为的影响  

Influence of tool pin-tip profiles on flow behavior of FSW joint-root material

作　　者：严超英[1] 邢丽[1] 黄永德[1] 柯黎明[1] 

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室,南昌330063

出　　处：《焊接学报》2015年第4期51-55,115-116,共7页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51364037;51265042;51265043);江西省高等学校科技落地计划资助项目(KJLD12074;KJLD13055);航空科学基金资助项目(20111156004)

摘　　要：采用不同端部形状的搅拌针对12 mm厚的6061-T4铝合金进行对接焊,观察了匙孔处不同横截面上焊缝形貌,分析了搅拌针端部形状变化对FSW接头根部金属流动行为的影响.结果表明,FSW焊缝区金属沿焊缝厚度方向上的迁移主要受搅拌针表面螺纹影响,而搅拌针端部锥度对接头根部金属的迁移的影响可分为两个方面,一是脱离螺纹作用的金属向下迁移,二是焊核区金属的向上迁移.搅拌针端面直径影响FSW接头未焊透厚度.随搅拌针端面直径增加,搅拌针可焊板材厚度增大.Friction stir butt joints of 6061-T4 aluminum alloy plates with a thickness of 12 mm were welded by various pin-tip profiles of the tool. The morphology of different cross section of key hole was observed,and the influence of pin-tip profile on joint-root material flow behavior was analyzed. The results show that the metal of FSW weld zone migration along the weld thickness direction is mainly affected by the thread of pin surface. The impact of the pin-tip taper on the joint-root metals migration along the weld thickness direction can be divided into two aspects,one effect is on downward migration of metal breakaway from pin thread,the another is on upward migration of weld nugget metal. The diameter of pin-tip affects the thickness of incomplete penetration of FSW butt joint. With the diameter of pin-tip face increases,the thickness of pin-tip affected zone increases,and thicher plate will be welded well.

关 键 词：搅拌针端部形状 FSW 流动行为 未焊透 

分 类 号：TG453.9[金属学及工艺—焊接]