铝锂合金被认为是航空航天飞行器轻量化的理想材料之一。针对大型飞机整体壁板结构，采用高亮度固体激光器进行2 mm厚的2060-T8/2099-T83铝锂合金T型接头双光束焊接，研究了焊接气孔、裂纹和接头的力学性能。结果表明，焊前需至少去除0.15 mm厚的表面层，才能有效避免宏观氢气孔的产生；采用AlSi12焊丝和合适的坡口设计，可完全消除焊接热裂纹；接头环向拉伸强度可达385~415 MPa，为2060-T8铝锂合金蒙皮强度的82.5%；熔合区是接头最薄弱部位。

Aluminum-lithium alloy is considered to be one of the promising light-weight materials for aerospace applications. In the experiment, T-joint of 2060-T8/2099-T83 aluminum-lithium alloy with thickness of 2 mm is welded by using two high brightness solid state lasers from the two sides of the stringer aimed to integral aircraft fuselage panels. The weld porosity, cracking and joint mechanical properties are investigated. The results show that macro hydrogen pores can be avoided only when the surface layers are removed at least 0.15 mm thick, while the hot cracking can be completely eliminated with filler wire of AlSi12 and an appropriate bevel design. The hoop tensile strength of laser-welded T-joints is among 385~415 MPa, 82.5 % of that of the 2060-T8 skin sheet. The bond is the weakest region of the joint.