Method of manufacturing pipe assembly

A method of manufacturing a pipe assembly, the pipe assembly including a pipe member and a plurality of additional fixture members that are externally fixed to the pipe member,

• wherein the pipe member includes a first pipe element and a second pipe element that is fitted and joined to an end portion of the first pipe element,
• wherein a plurality of joints between the pipe member and the plurality of additional fixture members at a plurality of positions of the pipe member, as viewed in the axial direction, where the plurality of additional fixture members are to be fixed include a first joint, where one of the additional fixture members is joined to the outside of the portion where the first pipe element and the second pipe element are fitted to each other, and one or more second joints, where one or more of the additional fixture members are joined to at least one of the first pipe element and the second pipe element at one or more positions other than where the first pipe element and the second pipe element are fitted to each other, and
• wherein the method comprises:
• placing the plurality of additional fixture members outside the pipe member at the plurality of positions where the plurality of additional fixture members are to be fixed;
• placing a plurality of electromagnetic coils inside the pipe member at one or more of the plurality of positions where the plurality of additional fixture members are to be fixed;
• and
• while the plurality of additional fixture members are placed outside the pipe member at the plurality of positions where the plurality of additional fixture members are to be fixed and while the plurality of electromagnetic coils are placed inside the pipe member at one or more of the plurality of positions where the plurality of additional fixture members are to be fixed, increasing the diameter of the pipe member in areas corresponding to where the plurality of electromagnetic coils are placed, as viewed in the axial direction, by applying a pulse current to the plurality of electromagnetic coils, so that the plurality of additional fixture members are swaged and fixed to the pipe member by electromagnetic forming, wherein one of the additional fixture members that constitutes the first joint is swaged and fixed to the pipe member by electromagnetic forming before the additional fixture members that constitute the second joints.