Dissimilar Metal Joining
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Date
2012-07-17
Authors
Beyer, Eckhard
Brenner, Berndt
Göbel, Gunther
Kaspar, Jörg
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Abstract
Magnetic pulse welding (MPW) can offer unique advantages over other joining techniques
when applied correctly. Especially for dissimilar metal welding it has several advantages
due to its very low heat input and short process times. Due to the high demands of the
process on the welding system properties, it is vital to understand the process as detailed
as possible to reduce system-related challenges and costs.
The paper discusses similarities and dissimilarities to other high velocity joining
processes like explosion welding. Specific aspects of MPW, like its special transient
nature are presented and their impact on welding parameters are explained. Using results
of example welds on similar and dissimilar metal joints, microscopic and macroscopic
effects of part geometry, metallurgical behaviour and pulse parameters are shown.
Concerning microscopic effects, the question is discussed whether interfaces of
dissimilar metals can fully be free of intermetallics. This is a relevant question in relation to
achievable joint strength, joint ductility and even electric conductivity. Here evidence of
recent SEM and TEM analysis is presented. Conclusions are drawn with respect to
optimal process conditions and practical geometric relations on the macroscopic scale.
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Keywords
interface, welding