| 摘要 |
PURPOSE:To efficiently form a multiple cylindrical member by fitting the inner part of the inner-most cylinder by heating it with the heating means fitted to the inner side of the inner-most cylindrical member of plural cylindrical members which are fitted each other and by performing the diffusion joining of the plural cylindrical members. CONSTITUTION:A joining face 3 is made in vacuum state by a vacuum pump 6 through an exhaust pipe 5, by welding a vacuum sealing plate 4 to the joining face 3. A jig 12 is arranged at the outside of an outer cylinder 1, a sealed space 14 is formed by welding the end face thereof and the end face of the outer cylinder 1 with hydrostatic sealing plate 13 and a high pressure fluid body is fed to the sealing space 14 through a piping 16 from a compressor 15. After forming this state the outer cylinder 1 and inner cylinder 2 are subjected to a diffusion welding by heating with the heating source 15 of a gas burner and so on. In this way, a product can be formed effectively.
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