Abstract:In order to improve the performance of the welded joint and prolong its service life, the industrial pure titanium TA2 welded joint was strengthened by ultrasonic shot peening (USSP) with a shot peening strength of 0.15A. The microstructure and corrosion morphology of TA2 welded joints were observed by OM, SEM and TEM. The residual stress values and surface roughness of different treated samples were measured, the surface of the samples after ultrasonic shot peening were heat treated. And surface grinding, the electrochemical corrosion performance of different surface residual stress and surface roughness on the welded joint weld zone in 80 ° C 10% HCl solution was studied. The results show that the corrosion resistance of the USSP intensive treatment of pure titanium welded joints has been improved. After annealing, the corrosion resistance first increases and then decreases with the increase of annealing time. When annealing for 0.5h, the natural corrosion potential was the highest, the current density was the lowest, and the corrosion resistance was optimal. After surface grinding, the corrosion rate is mainly controlled by the diffusion step, resulting in concentration polarization. As the polishing strengthening layer increases, the diffusion rate increases, and the corrosion resistance has been improved. When polished to 2/5 of the strengthening layer, the corrosion resistance has been improved significantly.