摘要
以5052铝合金和热镀锌ST04Z钢为研究对象,采用预置涂粉CO2激光搭接熔钎焊方法进行工艺试验.利用光学显微镜、扫描电镜和拉伸试验机对熔钎焊接头的微观组织和力学性能进行了研究.结果表明,涂助溶剂和粉末后,焊缝成形明显改善,镀锌层没有烧损;熔—钎焊接头过渡层最大厚度小于10μm,针状Al-Fe金属间化合物没有向熔化的铝侧明显析出;接头具有较高的力学性能,最大机械抗载能力可达到208 MPa,约为5052铝合金母材抗拉强度的95.41%.
Welding between aluminum and steel has become a hot and difficult problem in the field of welding. By means of CO 2 laser welding and brushing metal powder and flux before welding,overlap fusion-brazed joint between 5052 aluminum alloy and ST04Z zinc-coated steel sheets was obtained,in which the 5052 aluminum alloy was melted but zinc-coated sheet was brazed. The microstructure in the joint and fracture features of the tensile specimen were investigated by optical microscope, scanning electron microscope( SEM) and universal testing machine. The results indicate that after brushing metal powder and flux,the laser absorption could be improved greatly,and the resultant weld appearance was sound and the zinc-coated layer was not burned. The thickness of the intermediate layer was less than 10 μm,and acicular intermetallic compounds did not diffuse into the aluminum weld. The maximum tensile strength of the joint was 208 MPa,about 95% of 5052 aluminum alloy.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第1期1-4,113,共4页
Transactions of The China Welding Institution
基金
甘肃省自然科学基金资助项目(3ZS041-A25-031)
关键词
铝钢
激光焊接
熔钎焊
粉末
aluminum alloy and steel
laser welding
fusion-brazing
metal powder
作者简介
作者简介：樊丁，男，1961年出生，教授，博士研究生导师．主要从事焊接物理、焊接方法与智能控制及激光加工等方面的研究．发表论文200余篇．Email：fand@lut．cn
