Welding wire for welding titanium-aluminum dissimilar metal and preparation process of welding wire

The invention belongs to the technical field of metal welding, and particularly relates to a welding wire for welding titanium-aluminum dissimilar metal and a preparation process of the welding wire. The welding wire with brand new composition is adopted, is simple in composition, does not contain precious metal elements and does not need to be matched with a vacuum process; after titanium-aluminum dissimilar metal is welded, the surface of a weld joint is smooth and does not crack, the mechanical property of the weld joint is obviously improved, the tensile strength is larger than or equal to 250 MPa, the percentage elongation after fracture is larger than or equal to 6.5%, and large-scale industrial production is facilitated. 本发明属于金属焊接技术领域，具体为一种钛铝异种金属焊接用焊丝及其制备工艺，采用全新组成的焊丝，其组成简单，且不含贵金属元素，更无需配合真空工艺；钛铝异种金属焊接后的焊缝表面平整、不开裂，焊缝力学性能明显改善，抗拉强度≥250MPa，断后伸长率≥6.5％，便于大规模工业生产。