Influence of the Free Compression Stage on Magnetic Pulse Welding of Tubes
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Date
2018-05-15
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Abstract
In magnetic pulse welding (MPW) of tubular parts, the acceleration of the ‘flyer’ part typically
corresponds to a free electromagnetic compression (EMC) process over the distance
of the initial standoff between the outer and inner tube. During this process stage, already
significant plastic strains occur. In addition, wrinkling is a phenomenon frequently observed
during EMC. In this manuscript, influencing factors on the wrinkling effect are
identified, taking the initial geometry of the flyer tube and its manufacturing process into
account. Moreover, a link between the strains and wrinkles caused by the tube compression
and the MPW process is made.
An experimental study is performed aiming for the quantification of the plastic deformation
during EMC. The effect of this deformation on the stability and adhesion of brittle
surface layers is analyzed. Accompanying numerical simulations help to understand the
wrinkle formation and its influencing factors. Based on the results, hints for an improved
process design of MPW are given.
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Keywords
joining, welding, magnetic pulse welding
Subjects based on RSWK
Schweißen, Elektromagnetisches Pulsschweißen