Provided is a method for manufacturing a welded joined body in which a ring-shaped workpiece and a linear workpiece are reliably welded. In addition, provided is a welding device that is able to weld a ring-shaped workpiece and a linear workpiece reliably. This method for using a device equipped with a first electrode and a second electrode to manufacture a welded joined body of a ring-shaped workpiece and a linear workpiece is provided with: a step for arranging a first electrode and one end portion of a linear workpiece on the inside of a ring-shaped workpiece； a step for arranging a second electrode on the outside of the ring-shaped workpiece； a step for bringing the second electrode into contact with the outside of the ring-shaped workpiece, thereby sandwiching the ring-shaped workpiece and the linear workpiece between the first electrode and the second electrode； and an application step for applying a current or voltage between the first electrode and the second electrode. When the side on the one end portion of the linear workpiece is defined as the distal side and the opposite side is defined as the proximal side, in the application step the distal end of a second electrode contact portion, which is the portion of the second electrode where the second electrode and the ring-shaped workpiece make contact, is arranged closer to the distal side than the distal end of the linear workpiece.L'invention concerne un procédé de fabrication d'un corps assemblé soudé dans lequel une pièce annulaire et une pièce linéaire sont solidement soudées. De plus, l'invention concerne un dispositif de soudage qui est apte à souder solidement une pièce annulaire et une pièce linéaire. Ce procédé d'utilisation d'un dispositif équipé d'une première électrode et d'une seconde électrode pour fabriquer un corps assemblé soudé d'une pièce annulaire et d'une pièce linéaire comporte : une étape consistant à disposer une première électrode et une partie extrémité d'une pièce linéaire sur l'
