摘要
以ST07Z钢板和5052铝合金为例,进行了激光搭接焊试验。利用MATLAB软件得到了熔池几何形状分布,进而优化焊接工艺参数。采用金相显微镜、扫描电镜等工具分析焊接接头的金相组织、断口形貌、力学性能。结果表明:焊缝成形比较理想,无气孔、裂纹等明显缺陷;接头区域中出现台阶状区域,该区域异种金属材料之间存在比较明显的分界线;界面结合主要借助钢母材表面上液态铝的润湿、铺展、填充等作用;焊接接头抗剪强度平均值为27.90MPa;焊缝断裂形貌整体表现出韧性和准解理混合型特征。
The laser lap-welding experiment is carried out with steel plate ST07 Z and aluminum alloy5052. The weld pool geometry distribution is obtained by using MATLAB software. Then welding process parameters are optimized. The welding joint microstructure, fracture morphology and mechanical properties are analyzed with the metallographic microscope and scanning electron microscopy. The results show that the weld is ideal without obvious defects such as porosity,crack etc. Step areas appear in the joint area and there is obvious dividing line between dissimilar metal materials. The interface bonding relies on the liquid aluminum on the wetting,filling and spreading of steel surface. The Average welding joint shear strength is 27. 90 MPa and the fracture morphology of welding joint is a quasi-cleavage and ductile mixing mode.
出处
《科技通报》
2018年第3期134-137,143,共5页
Bulletin of Science and Technology
基金
珠海市先进装备制造与材料成型技术重点实验室项目(粤教高函[2015]62号)
广东省高职教育专业领军人才培养对象项目
关键词
车用异种金属
激光焊接
断口形貌
力学性能
焊接熔池
automotive dissimilar metals
laser welding
fracture morphology
mechanical property
weld pool
