Influence of the Wall Thicknesses on the Joint Quality During Magnetic Pulse Welding in Tube-to-Tube Configuration
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Date
2016-04-27
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Abstract
The implementation of multi-material concepts, for example, in automotive engineering or
aerospace technologies, requires adequate joining techniques. The Magnetic Pulse Welding
(MPW) process allows for joining both similar and dissimilar materials without additional
mechanical elements, chemical binders, or adverse influences of heat on the joining partners.
In this process, an electro-conductive at (‘flyer’) part is accelerated by Lorentz forces
and impacts the inner (‘parent’) part under high velocity and high pressure, leading to the
formation of a metallurgical joint. Besides joining of sheets and tubes to solid cylinders, the
connection of two tubes is of particular interest due to the increased lightweight potential.
The present paper focuses on the MPW of aluminum (EN AW-6060) to steel (C45) tubes. An
experimental study was performed, in which the wall thickness of the parent part was reduced
successively. The deformation behavior of both the flyer and parent parts was recorded
during the experiments by a two-probe Photon Doppler Velocimeter (PDV). The final
shape of the joined specimens was analyzed by a 3D digitizer. An instrumented peel test was
used for the determination of the weld quality. It was found that defect-free MPW of aluminum
tubes on steel tubes without supporting mandrel is possible.
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Keywords
joining, magnetic pulse welding, welding