Solid state joining of dissimilar sintered P/M preform tubes by simultaneous cold extrusion

The present investigation describes about producing a sound transition joint between two dissimilar metal tubes by tailoring the initial materials characteristics through powder metallurgy (P/M) and cold extrusion route. An attempt has been made to analyse the influence of process parameters such as density ratio, volume ratio, interfacial angle and strain on successful solid state joining of steel–Cu and Cu–Al P/M preform tubes. The correlation between the process parameters and failure propensity, weld strength, extrusion force, change in interfacial angle, strain in each material and microstructural features of the joints is also presented.