Abstract: Conducting the repair welding process of the small-sized spiral welded steel pipe has been constrained for so long a time by limited operation space，which means due to the small size of the pipe，the operator cannot use the electrode arc welding to repair inner weld defects，and as a result，the welding quality has been always a bottleneck as restricting the development of relevant pipe-making companies. In order to ensure the product quality，the company uses TIG welding repair welding technology for small-diameter spiral welded pipes to realize single-sided welding and double-sided formation，meanwhile actions such as optimizing the welding process parameters，analyzing the operating skills，and properly matching the welding materials are taken as per relevant reasonable construction plan and solutions. The actual production verification proves that all the performance indicators of the product have met Standard GB/T 9711—2023 PSL2 and relevant customer’s technical requirements，and the application effectiveness is good.