On Bond Formation in Magnetic Particle Pulse Welded Joints
Keywords:
Magnetic Pulse Welding, Al couple, Al-Mg couple, jet, wavy interfaceAbstract
This contribution discusses the microstructures observed in the bonding zone during electromagnetic impulse welding of similar and dissimilar alloys. Magnetic pulse welding (MPW) is accomplished by high-velocity impact between the two alloys. The impact has sufficient energy to cause the colliding metal surfaces to flow hydrodynamically when they intimately contact one another in order to promote metallurgical bonding, resulting permanent deformation with no springback. The origin of the MPW morphologies were studied by: light optical and scanning electron microscopy and the distribution of the alloying elements was measured by energy-dispersive spectrometry. The residues of metal jet emitted during MPW was also investigated and analyzed. The interface between the two components is typically wavy and displays an elevated microhardness. The interfacial zone displays discontinuities like inclusions, cracks and pores. No heat-affected zone was observed adjacent to the interface in alloys.
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Papers accepted for publication become the copyrighted property of the Annals of "Dunarea de Jos" University of Galati, Fascicle XII, Welding Equipment and Technology. No part of the publication may be reproduced or transmitted in any form, or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, except in limited quantities for the non-commercial purposes of scientific or educational advancement, without permission in writing from the Editorial Board.
