As a new type of friction stir welding, Bobbin self-supporting welding technology is a supplement to the traditional friction stir welding. The top and bottom surface of workpiece can be welded simultaneously with Bobbin shoulder tool, and there is no rigid supports for the back of the product during welding process. The lack of penetration or root defects can be fundamentally eliminated. It is especially suitable for the splicing of long straight hollow profiles and the splicing of barrel longitudinal seams.
Bobbin FSW tool
（1）Common aluminum alloy (4XXX、5XXX、6XXX）
1. The top and bottom surface of workpiece can be welded simultaneously
2. The lack of penetration for traditional FSW can be solved
3.The welding of the hollow profile can be relized
（2）High-strength aluminum alloy
For the extensive marketing demand for the rail transit field, AEE actively carries out BFSW research work. At present, we have successfully achieved a variety of aluminum alloy BFSW. The research results have been applied to many kinds of domestic rail trains.