摘要
使用IPG YLS-5000多模光纤激光器实现了12mm厚TC4钛合金光纤激光窄间隙焊接,优化了焊接工艺,并对焊缝组织和显微硬度进行了分析。结果表明:激光窄间隙焊接容易产生气孔和侧壁未熔合缺陷,优化后的焊接工艺能显著减少气孔并消除未融合缺陷。母材显微组织为典型的等轴组织,焊缝区显微组织由粗大的β柱状晶和网篮状马氏体α'组成。热影响区晶粒尺寸明显细化。热影响区组织由细小的针状马氏体α'、转变α组织和β转变组织构成。焊缝区和热影响区的显微硬度高于母材,近焊缝热影响区显微硬度达到最大值。
The IPG YLS-5000 multi-mode fiber laser is used for the 12mm thick TC4 plate by the multiple-pass narrow-gap approach. Optimized process parameters are attained, as well as the microstructure in laser beam welds of TC4 titanium alloy is investigated. The result shows that incomplete fusion and porosity could be reduced using the optimized welding parameters. The microstructure of the base metal （BM） is typical equiaxed structure. The microstructure of fusion zone （FZ） is composed of 13 columnar crystal and basket weave martensite a＇ phase. The grain size of heat affected zone （HAZ） is obviously refined. The HAZ partially transformed is made up of martensite α＇ phase, transformed a and trans- formed β. Moreover, the mierohardness of weld metal and heat affected zone is higher than that of base metal, and the hard- ness reaches to peak value in the heat affect zone near weld metal.
出处
《航空制造技术》
2016年第23期104-107,共4页
Aeronautical Manufacturing Technology
