The Radial Friction Welding (RFW) process offers the cost effective production of high quality welded titanium alloy risers offshore. The present study evaluates the metallurgical and mechanical properties of RFW welded Ti-6Al-4V-0.1Ru pipes (9 mm thick, 170 mm outside diameter). The microstructural features of the weldments have been investigated by optical microscopy. The mechanical properties of the welded joints were characterized by micro hardness tests, conventional tensile and micro flat tensile tests. The mechanical properties are discussed on the basis of the microstructural features. The microstructural investigations showed a fine transformed microstructure in the weld region (incl. HAZ). The tensile test results revealed higher weld region strength (incl. HAZ) compared to the pipe material (overmatching) due to the observed fine transformed microstructure in this region. The weld ductility of the higher strength weld and HAZ regions remains high due to a process induced beta grain refinement by recrystallization.


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    Title :

    Mechanical properties of Ti-6Al-4V-0.1Ru riser pipes joined by radial friction welding


    Contributors:
    Torster, F. (author) / Santos, J.F. dos (author) / Hutt, G. (author) / Kocak, M. (author)


    Publication date :

    1998


    Size :

    8 Seiten, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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