激光焊接6156-T4铝合金对接与T型接头的性能对比  

Property Comparison of Laser Welded Butt Joint and T-joint of 6156-T4 Al Alloy

作　　者：刘虎[1] 尚德广[2] 刘建中[3] 杨光友[1] 

机构地区：[1]湖北工业大学,湖北省农业机械工程研究设计院,武汉430068 [2]北京工业大学机械工程与应用电子技术学院,北京100124 [3]中国航发北京航空材料研究院,北京100095

出　　处：《机械工程材料》2017年第8期59-62,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51535001);武汉市关键技术攻关计划项目(2010CDB02504)

摘　　要：用拉伸试验机、疲劳试验机、扫描电镜等对激光焊接6156-T4铝合金对接接头和T型接头的拉伸性能、疲劳性能和断口形貌进行了对比研究。结果表明:对接接头的拉伸性能接近于母材的,T型接头的抗拉强度较母材的有一定程度的降低,对接接头的疲劳强度明显高于T型接头的;对接接头疲劳断口位于热影响区,T型接头的断口穿过热影响区和母材;两种接头疲劳裂纹均萌生于应力集中较为严重的焊趾部位,以近似半椭圆的形状沿厚度方向扩展直至接头断裂。The tensile property,fatigue property and fracture morphology of the laser welded butt joint and T-joint of 6156-T4 Al alloy were researched and compared using the tension testing machine,fatigue tester,scanning electron microscope,etc.The results show that the tensile property of the butt joint was close to that of the base metal,while the tensile strength of T-joint decreased to a certain extent comparing to that of the base metal.The fatigue strength of the butt joint was obviously higher than that of the T-joint.The fatigue fracture of the butt joint was in the heat affected zone while that of the T-joint was across the heat affected zone and base metal.The fatigue cracks of the two joints initiated from the weld toe,at which the stress concentration was relatively serious,and then propagated in a shape of approximate semi-ellipse along the plate thickness direction until the joint fracture.

关 键 词：6156-T4铝合金 激光焊接 拉伸性能 疲劳性能 

分 类 号：TG40[金属学及工艺—焊接]