Aluminium/magnesium combo provides secure joints
An
Arnold Umformtechnik product story
Edited by the Engineeringtalk editorial team
Apr 17, 2008
The increasing importance of magnesium as a construction material requires an inspired pairing of materials when it comes to screw fastenings.
The increasing importance of magnesium as a construction material requires a pairing of materials when it comes to screw fastenings.
Alufast aluminium screws from Arnold Umformtechnik have proved to be particularly excellent for making screw fastenings on housing sections, brackets and stiffeners made of magnesium.
The lower weight, compared to steel versions, suits engineers working in many fields, including gearbox design.
The Alufast range suits use in corrosive atmospheres where fastener locations are subjected to particularly high-temperature loads.
Alufast screws have proven to be of particular value under thermal loads.
The mechanical properties of the screws remain stable over a long-term period of load, up to peak temperature of 150C.
Designers can use standard head settings when fastening magnesium components, unlike steel screws, which would require larger head settings.
The screws achieve process reliability, high strength and expansion characteristics and also possess excellent anti-corrosion properties.
Alufast produces greater residual clamp forces on magnesium fastenings under operational thermal loads than is possible with steel screws.
It is also 20 - 30% cheaper than steel screws with supplementary corrosion protection systems.
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