| 摘要 |
PURPOSE:To easily form a rib at optional place by inserting the annular sleeve forming a rib and brazing filler metal pool part into a heat transmission pipe stock and by heating by placing a brazing filler metal on the brazing filler metal pool part. CONSTITUTION:A sleeve 10 is composed of the cylindrical main body part 11 that plural projecting bars or ribs 12 extending in the axial direction are formed on the outer face by bulging and other machinings by being placed at intervals in the peripheral direction. This annular sleeve 10 is inserted to the outer periphery of the pipe stock, 1 the end part E of the sleeve 10 is subjected to a drawing and fitted to the pipe stock 1 at adequate brazing intervals. Thereafter, a paste like brazing filler metal is placed on each notch 14 and heated at the prescribed temp. by putting into a vacuum heat treatment furnace, etc. The brazing filler metal placed on the notch 14 is melted, extending over the whole face between both end parts E of the sleeve main body part 11 in the space between the inner face of the sleeve 10 and the outer face of the pipe stock 1, and fixed with cooling. |
