摘要
文中对厚度2 mm的C24S-T8态铝锂合金进行了真空电子束焊,分析了不同焊接工艺参数以及扫描方式对焊缝成形及力学性能的影响。结果表明:在工作距离300 mm,电压60 kV,聚焦电流492 mA,焊速1000 mm/min以及电子束流7.2 mA的情况下,不添加扫描能获得成形良好的焊接接头。相同参数条件下,添加直线扫描和圆形扫描有利于细化焊缝晶粒,提高接头综合力学性能。添加扫描后的焊缝为尺寸细小的等轴晶,晶内析出相明显减少,仅晶界处呈条带状分布;其中圆形扫描的焊缝为尺寸约10μm的细小等轴晶,其抗拉强度可达到母材的78.7%,焊缝显微硬度为HV110.78,焊缝断后为细小的等轴韧窝,表现为高抗拉强度、高硬度和良好的塑性、韧性。
In this paper,vacuum electron beam welding process of C24S-T8 Al-Li alloy sheet with a thickness of 2 mm was studied.The influence on appearance of weld,microstructure and mechanical properties of the welded joint with different welding parameters and scanning modes was investigated.The results showed that a well formed welded joint without the addition of scanning could be obtained without defect when the working distance was 300 mm,the acceleration voltage(U)was 60 kV,the focusing current(If)was 492 m A,the welding speed(v)was 1000 mm/min,and the electron beam(Ib)was 7.2 m A.And when the linear scanning and circular scanning were added,the grains in welding could be refined and the comprehensive mechanical properties of the joint could be improved with the same parameters.The welding was composed of fine equiaxed grains,and the precipitates in the grains were obviously reduced and only the grain boundaries were banded after added the scanning.Especially,the welding with circular scanning was composed of fine equiaxed grains which the size was about 10μm,and its tensile strength could reach 78.7%of the base metal,the microhardness of the welding was HV110.78,and the fracture was fine equiaxed dimples,which showing high tensile strength,high hardness and good plasticity and toughness.
作者
何艳兵
黄忠宝
黎子浩
胡慧贤
姚桂坪
罗家植
HE Yan-bing;HUANG Zhong-bao;LI Zi-hao;HU Hui-xian;YAO Gui-ping;LUO Jia-zhi(Research Institute of Technology,Guangzhong Risong Intelligent Technonlogy Holding Co.,Ltd.,Guangzhou 510000,Guangdong pro.,China)
出处
《焊接技术》
2020年第6期44-48,I0012,共6页
Welding Technology
