| 摘要 |
PURPOSE:To seal satisfactorily an ultrafine tube and to improve the quality in a sealed part by driving a plug material which is the same or approximately the same as the material of a tube plate into said tube and subjecting the plug material and the tube plate to low-frequency pulse TIG welding. CONSTITUTION:A plug 14 is driven into an ultrafine tube 13 inserted into the hole 12 of a tube plate 11 and is subjected to low-frequency pulse TIG welding. If the plate 11 is formed of, for example, pure nickel, the plug 14 is formed of pure nickel or the like which is the same or approximately the same as said material. The tube 13 is a palladium tube. The small plug 14 is melted and further the plate 11 is melted according to the above-mentioned method and therefore the welding is easily made possible without adding a welding wire. |
