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A new technology for the joining by forming of magnesium alloys

: Neugebauer, Reimund; Mauermann, R.; Dietrich, S.; Kraus, C.

Postprint urn:nbn:de:0011-n-618035 (350 KByte PDF)
MD5 Fingerprint: 7741f6256cefdf06c7d5730197cbd0fe
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Erstellt am: 1.4.2011

Production Engineering. Research and development 1 (2007), Nr.1, S.65-70
ISSN: 0944-6524
ISSN: 1863-7353
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWU ()
production process; clinching; Magnesium

Joining by forming of magnesium alloys is restricted by the limited forming capability of magnesium at room temperature. To form acceptable joints without cracks usually heating of the parts to temperatures of 220°C or more is required. The application of state-of-the-art joining by forming methods (such as self-pierce-riveting or clinching with a contoured die) implicates pre-heating times of at least 3-6 s to achieve joints of acceptable quality. A new joining by forming technology, that is working with a flat anvil as a counter tool instead of the contoured die shall be introduced in this paper. This new technology is offering important advantages especially in joining Mg/Mg, Al/Mg or Fe/Mg connections, most remarkably being the reduction of pre-heating times to less than 1 s, thus allowing for the fast and reliable joining of magnesium parts. Parameter influences on the formation of the connections have been investigated and the values for the tensile strength have been determined for a wide range of connections.