The feasibility of the FRIEX welding process has been successfully demonstrated. The study of this new variant of the friction welding process shows that the process is suitable for joining pipes. Using the small and medium-scaled experimental test set-ups, high quality welds could be produced for pipes in the pipeline steels L290NB and L360NB with a maximum outer diameter of 141 mm. Suitable welding ring materials could be defined for welding these pipe materials. An extensive knowledge has been obtained concerning the heat distribution, heat flow, plasticity and material behaviour of the parts to be joined. The use of finite element simulations proved to be a very helpful tool for a better understanding of the process, orientation of experiments, prediction of the process parameters and the machine working range and for designing and evaluating the welding ring design. Using a large-scale test set-up, the weldability of the micro-alloyed high-strength pipeline steel L450QB has been experimentally investigated. It was found that the Friex welding process is suitable for joining this material. The implementation of the process has also been studied: a design has been made of a largescale operational field machine with capabilities for welding steel pipes with a diameter of 220 up to 504 mm. Various technical aspects of a field operation were investigated, such as the necessary drive torque, power capacity, clamping methods for coated pipes, axial forces between welding ring and pipe, fixture of the welding ring, internal clamping, removal of welding flashes, forging forces, etc.
Development of the FRIEX welding process
2011
16 Seiten, 25 Bilder, 27 Quellen
Conference paper
Storage medium
English
Reibschweißen , Variante , Rohrleitung , Temperaturverteilung , Wärmefluss , Plastizität , Materialverhalten , Finite-Elemente-Simulation , Prozessparameter , Schweißbarkeit , Antriebsdrehmoment , Mikrostruktur , Charpy-Spitzkerbschlagversuch , Modellentwicklung , Qualitätskontrolle , metallographische Prüfung , Zugprüfung , Biegeprüfung , Wärmeeinflusszone , Härte
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