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Functionally graded compositional control methods to eliminate dissimilar metal welds (DMWs) during manufacture of integral headers
Functionally graded compositional control methods to eliminate dissimilar metal welds (DMWs) during manufacture of integral headers
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机译:功能分级的成分控制方法,可在制造集管时消除异种金属焊缝(DMW)
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摘要
A method of manufacturing a header assembly having a header section and a tube section includes the steps of providing a reverse mold of the header assembly, forming the header section by filling a header section of the reverse mold with an atomized low alloy steel powder, and forming the tube section. The tube section is formed by filling a first portion of a tube section with an atomized low alloy steel powder, forming a transition region by filling a second portion of the tube section with a series of atomized steel powders incrementally from a low alloy steel to an austenitic stainless steel, and filling a third portion of the tube section with an atomized austenitic stainless steel powder. The method further includes the step of consolidating and melting the atomized powders in a high temperature, high pressure atmosphere.
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