Through effectively integrating the spiral tube forming equipment with friction stir welding equipment,the FSW welding of spiral tube of aluminum alloy has been achieved for the first time. Comparing with traditional fusion welding for longitudinal seam tube,this project can realize the synchronization of spiral tube forming and FSW welding,which can greatly improve the production efficiency.The mechanical property and microstructure compactness of the welds and the dimensional precision,sealing and pressure-bearing capacity of the product obtained by FSW welding for spiral tube are all significantly better than those obtained by fusion welding for longitudinal seam tube. This project can effectively solve the problems of the low production efficiency,high cost and poor quality of large diameter aluminum alloy tube,and realize the domestic production of large diameter aluminum alloy tube with the characteristics of high yield,high quality,low consumption and environmental protection.