摘要
对厚度为2.0 mm的2A97铝锂合金进行了无填丝的激光焊接试验.通过拉伸试验、显微硬度计、光学显微镜以及扫描电镜研究了不同焊接热输入(激光功率、焊接速度)下焊接接头组织和性能.结果表明,随焊接热输入的增加,焊接接头系数增大,该厚度下2A97薄板最佳的焊接热输入为0.9~0.95 kJ/cm,此时接头系数可达到0.8左右.焊缝中的柱状晶分布区是强度最低区域,随焊接热输入的降低,焊缝区域中粗大的柱状晶所占比例增大,同时有伴随大量气孔出现,导致接头系数降低.
Butt joints of 2. 0 mm thick sheets of 2A97 aluminum-lithium alloy have been produced using laser autogenous welding method. The microstructure and properties of welded joints with different welding parameters( laser power and weld speed) were studied by optical microscope,scanning electron microscopy( SEM),microhardness tester and tension tester,respectively. The results show that the welded joint efficiency increase with the increasing of input power,the optimal input power is about 0. 9- 0. 95 kJ /cm for 2A97 sheet with 2. 0 mm thickness and the joint efficiency reach 0. 8. The columnar grains zone( CGZ) is the weakness region of welded joint,the distribution of CGZ in fusion zone( FZ) increases with the decreasing of input power and accompanied with welding pore,which results in the dropping of welded joint efficiency.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第5期100-104,118,共6页
Transactions of The China Welding Institution
