铝合金螺旋管FSW焊与纵缝管熔焊组织及力学性能对比

Comparison of microstructures and mechanical properties of FSW welding for aluminum alloy spiral tube and fusion welding for longitudinal seam tube

通过将自主研发的螺旋管成型设备与搅拌摩擦焊设备有效集成,首次实现了大口径铝合金螺旋管FSW焊。与传统的熔焊纵缝管相比,可实现管体成型和FSW焊接的同步进行,生产效率大幅提高,螺旋FSW焊焊缝的力学性能、焊缝组织致密性、产品尺寸精度、密封性及承压能力显著高于熔焊纵缝管。有效地解决了国内大口径铝合金管生产效率低、成本投入高及产品质量难以保证等问题,真正实现了大口径铝合金螺旋管高产、优质、低耗环保的国产化生产。

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.