铝合金5754的激光束/电阻缝焊特性  

Characteristics of Laser Beam-Resistance Seam Welding of 5754 Aluminum Alloy

作　　者：李永强[1] 赵贺[2] 赵熹华[1] 张伟华[1] 

机构地区：[1]吉林大学材料科学与工程学院,长春130022 [2]哈尔滨工业大学现代焊接生产技术国家重点试验室,哈尔滨150001

出　　处：《上海交通大学学报》2009年第9期1489-1493,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50575091)

摘　　要：采用由多功能电阻缝焊机、激光器和激光焊机器人组成的激光束/电阻缝焊(LB-RSW)焊接系统研究了1.0 mm厚5754铝合金搭接LB-RSW焊缝的成形、组织和力学性能,并与激光焊(LBW)焊接性能加以对比.结果表明:在相同激光功率条件下,与LBW相比,LB-RSW焊缝的表面成形性能更优,其焊接接头的熔深和拉剪力更大,可以显著提高铝合金的加工能力;LB-RSW焊缝的熔宽和熔深随着缝焊电流的增加而增大;除了在焊接速度1.5 m/min、焊接电流8 kA以外,焊接接头的拉剪力随焊接电流的增加而增大;LB-RSW和LBW的焊缝组织均由熔合线附近的柱状树枝晶和焊缝中心的等轴树枝晶组成,但LB-RSW比LBW的焊缝中心组织更细.Laser beam-resistance seam welding （LB-RSW） experiments of 5754 aluminum alloy with 1.4 mm thickness were carried out with LB-RSW system consisting of multi-functional RSW machine, laser and laser welding robot. Meanwhile, the shaping, microstructure and mechanical property of the lap-joint were studied systematically. In the case of the same laser power, the weld surface shaping condition of LB- RSW joint is superior to that of single laser beam welding （LBW）, and greater weld penetration depth and tensile shear load are obtained by LB-RSW comparing with LBW, which appears that the LB-RSW technique improves the machining ability for aluminum alloy. With RSW current increasing, both width and depth of the weld increase, and the tensile shear load also increases except for the condition of v= 1.5 m/ min and I=8 kA. In addition, the microstructures of welds achieved by LB-RSW and LBW are both composed of columnar dendritic grains near fusion line and coaxial dendritic grains in the weld center. However, the grains in the weld center acquired by LB-RSW are finer than that acquired by LBW.

关 键 词：铝合金 激光焊 电阻缝焊 特性 

分 类 号：TG456.7[金属学及工艺—焊接]