Microstructure Analysis and Fatigue Behavior of Laser Beam Welding 2060-T8/2099-T83 Aluminum–Lithium Alloys

In this paper, the microstructure analysis and performance research of dual laser beam welded 2060-T8/2099-T83 aluminum–lithium alloys were carried out. First, macroscopic morphology characteristics T-joint under different welding conditions observed. Then effect parameters pore defects on tensile fatigue properties weld out experimental results analyzed. It was found that heat input has a significant influence penetration joint. When power is too high, will absorb more energy increase in evaporation magnesium further penetration. depth increases, transverse strength tends to decrease. There no obvious rule for weld. At same time, inversely proportional porosity. increases from 19.41 23.33 kJ/m, porosity decreases 5.35% 2.08%. During test, it confirmed existence would reduce life addition, fracture can be when low, toe main source cracks. The crack propagation zone shows typical beach pattern final base metal presents brittle fracture. While, mainly located at defects. fractures inside have dimples.