Joint fixing device for long pipe part magnetic pulse welding and welding method

The invention relates to a joint fixing device for long pipe part magnetic pulse welding and a welding method, and belongs to the technical field of magnetic pulse welding. The problem that an existing welding joint fixing device cannot be used for long pipe part magnetic pulse welding is solved. The long pipe part magnetic pulse welding joint fixing device includes an outer fixing sleeve and a supporting component. The outer fixing sleeve is coaxially provided with a first mounting hole and a second mounting hole, the hole diameter of the first mounting hole is larger than that of the secondmounting hole, the hole diameter of the first mounting hole is equal to the outer diameter of an outer pipe to be welded, and the hole diameter of the second mounting hole is equal to the outer diameter of an inner pipe to be welded; the supporting component can extend into the inner pipe and can be in contact the inner wall of the inner pipe to be used for supporting the inner pipe to be welded,and inward deforming and s