振幅改变对TC4线性摩擦焊接头微观缺陷特征的影响  

Micro-defect characteristics in TC4 linear friction welding joints in relation to amplitude

作　　者：朱剑桥[1] 张彦华[1] 张田仓[2] 孙成彬[2] 

机构地区：[1]北京航空航天大学702教研室,北京100191 [2]北京航空制造工程研究所102室,北京100024

出　　处：《焊接学报》2014年第3期105-108,118,共4页Transactions of The China Welding Institution

摘　　要：从力学角度研究了振幅改变对TC4线性摩擦焊接头微观缺陷特征的影响.结果表明,接头典型微观缺陷主要有微孔和三叉形貌两种,微孔是界面未完全融合导致的结果,而三叉形貌是振动方向飞边与垂直振动方向飞边分离的结果.焊接过程中摩擦压力及摩擦剪切力产生的耦合力学效应决定三叉形貌的状态,焊接热输入与金属空间位移的耦合效应决定微孔的大小.当其它工艺参数一定时,存在某一临界振幅Acr,当振幅A≤Acr时,随着振幅的增大,三叉形貌枝叉长度及角度分别存在极小值与极大值,最大微孔直径则持续减小.当振幅A>Acr时,随着振幅的增大,三叉形貌枝叉长度及角度均减小,最大微孔直径则保持恒定值.Microdefect characteristics in TC4 linear friction welding joints in relation to amplitude was studied from the standpoint of mechanics. The results indicated that the type of microdefect characteristics included micro pore which were formed in the partly fused joint interface and three-branch structure caused by the separation of the vibration direction flash and the vertical vibration direction flash. The coupled mechanical effects resulted from friction pressure and friction shear force dominated the formation of three-branch structure. The coupling of welding heat input and metal space shift governed the size of micro pore. Other welding parameters remained constant and there was a critical amplitude,Acr,in all of experimental amplitudes A. On one hand,minimum branch length and maximum branch angle appeared and maximum micro pore diameter decreased continuously with the increase of amplitude when A ≤Acr. On the other hand,branch length and branch angle decreased continuously and maximum micro pore diameter remained constant with the increase of amplitude when A > Acr.

关 键 词：线性摩擦焊 振幅 微观缺陷 三叉形貌 微孔 

分 类 号：TG453[金属学及工艺—焊接]