Deaerating and hermetic sealing method of metal capsule in hot hydrostatic pressing method

Abstract

Abstract PURPOSE: To sufficinetly maintain the degree of vacuum at the HIP treating and improve the yield of products by screwing and intermeshing the plug formed by hard material into a deaerating pipe, and melt-sticking both thereby integrating the same. CONSTITUTION: When the inside of a capsule 1 and vacuum vessel 12 reaches the specified degree of vacuum, a plug 8 is screwed and fitted to a deaerating pipe 3. This plug 8 is formed by the material harder than the material of the deaerating pipe 3 and its edge 7 intermeshes with the tapered part 7 of the deaerating pipe 3, thus even if the vacuum vessel 12 is removed, the inside of the capsule 1 is perfectly hermetically sealed, whereby the initial degree of vacuum is maintained. Circumferential welding grooves 11, 11' are beforehand formed to the top end weld zones of this deaerating pipe 3 and plug 8, and are subjected to circumferential welding 9 by MIG welding or CO 2 welding, whereby the deposited metal is formed. This method eliminates the fear for deaeration insufficiency and hermetic selaing defect, and stabilizes the quality of the HIP product. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Katsuhiko Honma
• 👤 Kanji Notomi
• 👤 Hiroshi Takigawa
• 👤 Minoru Hirano
• 👤 Tsuneo Tateno

Bibliographic Details