焊接参数对LY12铝合金FSW焊缝S曲线形成的影响  

Effects of welding parameters on formation of lazy S weld in friction stir welding of LY12 Al-alloy

作　　者：邢丽[1] 陈爱华[1] 刘鸽平[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》2010年第5期9-12,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50875119);航空科学基金资助项目(20081156009);航空科学基金资助项目(20071156003)

摘　　要：在铝合金中镶嵌标识材料进行搅拌摩擦焊试验,分析了焊缝中S曲线的形成原因;并用圆锥光面搅拌针的搅拌头,研究了焊接工艺参数对LY12铝合金焊缝中S曲线形貌的影响.结果表明,焊缝中S曲线是原始界面与其周边金属一起位移、变形的结果;S曲线的形状取决于焊缝上部金属的旋转运动、搅拌针与原焊接面之间的相互作用以及焊缝底部金属朝远离焊缝中心线的方向和板材上方移动的综合作用.对于圆锥光面搅拌针,当焊接速度一定时,增大搅拌头的旋转速度;或当搅拌头旋转速度一定时,降低焊接速度,S曲线在焊缝厚度方向的贯穿区域减小并最终消失.The formation of lazy S weld in the friction stir welding of LY12 aluminum alloy was analyzed by the copper foils as a tracer material in the alloy.The influence of the welding pa-rameters on the formation of lazy S weld was investigated with a conical pin tool.The results show that lazy S weld is formed by the distortion of the original weld interface and its surrounding metal.The shape of the lazy S weld depends on the cooperation of the rotation of the upper part metal in the weld,the interaction between the stir pin and the metal around the original weld inter-face and,the metal at the bottom of the plate translating to the area away from the weld center and to the upper part of the plate.If the tool rotating speed is increased at the constant weld-ing speed or the welding speed is decreased at the given tool rota-ting speed,the lazy S weld covers less area along the weld thick-ness direction and disappears in the end.

关 键 词：搅拌摩擦焊 S曲线 焊接工艺参数 

分 类 号：TG456[金属学及工艺—焊接]