Abstract: Welding tests were conducted on Ti-2 Al-2.5 Zr/Ti-4 Al-2V pipe butt joints using wire filled argon arc welding with different parameters. The macroscopic morphology, microstructure, and texture of the welded joints were characterized by optical microscopy（OM）, scanning electron microscopy（SEM） and electron backscatter diffraction（EBSD）. The weld seam area and base material area of the welded joints were quantitatively characterized using Image Pro Plus software, and the influence of welding process on the microstructure of the weld seam was studied. The results indicate that as the heat input during the welding process increases, the width of the weld top gradually decreases and the width of the heat affected zone increases. The microstructure of the weld zone and heat affected zone undergoes a β→α（α’） phase transformation during the cooling process, both generating needle like martensite. The average size of the α variant in the weld zone increases with heat input increasing, with values of 7.57 μm, 8.45 μm, and 9.77 μm, respectively. The texture of the heat affected zone is relatively loose, and the degree of grain orientation growth in the weld zone with high current parameters is greater, resulting in higher texture strength. The study establishes the relationship between process parameters and microstructure, laying a data foundation for improving the research and development efficiency of Ti-2 Al-2.5 Zr/Ti-4 Al-2V pipe butt welding process.