Title: The extrusion of hollow profiles with a gas pocket behind the bridge

Authors: Henry Valberg, Thorbjoern Loeken, Morten Hval, Bard Nyhus, Christian Thaulow

Addresses: Department of Machine Design and Materials, The Norwegian Institute of Technology, The University of Trondheim, N-7034 Trondheim, Norway. ' RAUFOSS, Box 2, N-2831 Raufoss, Norway. ' QINTEF Materials Tcchnology, N-7034 Trondheim, Norway. ' QINTEF Materials Tcchnology, N-7034 Trondheim, Norway. ' Department of Machine Design and Materials, The Norwegian Institute of Technology, The University of Trondheim, N-7034 Trondheim, Norway

Abstract: Extrusion welding in porthole die extrusion of aluminium was investigated experimentally, using two different modular porthole extrusion dics. The die design allowed removal of the metal rests from the ports and the welding chamber of the die alter extrusion. The metal residue was then inspected to check whether the die cavities had been completely filled wilh metal during extrusion and to map to what extent these conditions influenced extrusion welding. The experiments aimed at extrusion conditions creating low pressure and partial filling of metal inside the welding chamber in order to investigate how these conditions of extrusion affect the quality of the extrusion seam. Extrusion conditions giving extrusion welds of insufficient strength and ductility were mapped in the experiments. The extrusion welds were tested with regard to mechanical properties in the direction transverse to the seam weld, both using tensile testing and fracture mechanics testing.

Keywords: extrusion welding; porthole die extrusion; hollow profiles; gas pockets; aluminium extrusion; die design; extrusion welds; insufficient strength; ductility; tensile testing; fracture mechanics.

DOI: 10.1504/IJMPT.1995.036453

International Journal of Materials and Product Technology, 1995 Vol.10 No.3/4/5/6, pp.222 - 267

Published online: 03 Nov 2010 *

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