| 摘要 |
PURPOSE: A method for manufacturing a weld-free apparatus for connecting different metal using functionally graded composition control powder metallurgy and hot isostatic processing methods is provided to enable flexible transition between tube thicknesses. CONSTITUTION: A method for manufacturing a weld-free apparatus for connecting different metal comprises the steps of: preparing a mold for reproducing a reverse mold, injecting first metal powder into a first portion of the mold, injecting second metal powder into a second portion of the mold, injecting third metal powder into a third portion of the mold, forming a transition portion out of the second metal powder between the first and third metal powder, forming a vacuum in the mold and sealing the mold for maintaining the vacuum condition, locating the mold in a High-Temperature Isostatic Pressing(HIP) furnace to melt and integrate the first through third metal powder, and cooling the mold to room temperature and removing a molded apparatus from the mold.
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