超声冲击对7A05铝合金焊接接头性能的影响  

Effect of ultrasonic impact treatment on properties of 7A05 alloy joint

作　　者：王冬生[1] 陈东高[1] 谭兵[1] 宋建民[1] 冯杰才[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《兵器材料科学与工程》2009年第5期69-72,共4页Ordnance Material Science and Engineering

摘　　要：对7A05铝合金采用双丝MIG焊接工艺得到的焊接接头进行超声冲击处理,并从焊趾处应变与应力、抗拉强度、疲劳寿命和疲劳断口扫描等方面对经过超声冲击处理和未经超声冲击处理的试样进行对比研究。研究结果显示,经过超声冲击处理的试样,焊趾处拉应力减小,抗拉强度增大,平均疲劳寿命变长。疲劳断口扫描显示冲击后材料在断裂前发生明显的塑性变形。The 7A05 aluminum alloy joint welded by double-wire MIG welding was treated by ultrasonic impact. Furthermore, tests such as the strain and stress at the welded toe, tensile strength and fatigue life, and fracture morphology observation were made on the joint before and after ultrasonic impact treatment respectively. The results show that the tensile stress of UIT- treated samples was reduced, while the tensile strength and average fatigue life were increased at the welded toe. The fracture morphology show that obvious plastic deformation occurred in UIT-treated alloys before fracturing.

关 键 词：超声冲击处理 焊接残余应力 疲劳性能 焊趾 

分 类 号：TG44[金属学及工艺—焊接]