为了满足大型构件连接需求，以TA15丝材为原料，采用钨极惰性气体保护焊（tungsten inert gas，TIG）对激光沉积制造（laser deposition manufacturing，LDM）和热等静压（hot isostatic pressing，HIP）制备的TA15母材进行连接。结果表明，连接试样不同区域组织存在差异，其中HIP母材微观组织为等轴晶，晶粒内部为双态组织；HIP母材热影响区A（heat affected zone A，HAZ-A）呈现等轴晶；TIG连接区呈现β柱状晶，晶粒内部为细小网篮组织；LDM区呈现β柱状晶，晶粒内部的网篮组织较TIG连接区粗大；LDM母材热影响区B（heat affected zone B，HAZ-B）晶粒形状仍为柱状晶。连接试样的室温抗拉强度和延伸率分别达到了1 046.3±13.7 MPa和6.2%±0.6 %。与母材相比，连接试样的抗拉强度提高，塑性下降。连接试样的断裂位置为HAZ-B，断裂机制属于半解理半韧性断裂。

In order to meet the jointing requirements of large-scale components，TA15 wire was used as raw material to join TA15 base metal prepared by laser deposition manufacturing （LDM） and hot isostatic pressing （HIP） with tungsten inert gas （TIG）.The results show that there are differences in the microstructure of different regions of the jointing specimens.The microstructure of the HIP base metal is equiaxed grains，and the internal structure of the grain is bimodal structure.The heat affected zone A （HAZ-A） of HIP base metal presents equiaxed grains.The TIG jointing zone presents β columnar grains，and the intracrystalline is fine basketweave structure.The LDM zone presents β columnar grains，and the basketweave structure inside the grains is coarser than that in the TIG jointing zone.The grain shape of heat affected zone B （HAZ-B） of LDM base metal is still columnar grains.The tensile strength and elongation of the jointed specimens at room temperature are 1 046.3±13.7 MPa and 6.2%± 0.6 % respectively.Compared with the base metal，the tensile strength of the jointed specimens increases and the plasticity decreases.The fracture position of the jointing specimens is HAZ-B，and the fracture mechanism belongs to semi-cleavage and semi-ductile fracture.