Method of joining aluminium alloy sheets of the AA7000-series
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United States of America Patent
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May 31, 2016
Grant Date -
Oct 2, 2014
app pub date -
Sep 10, 2012
filing date -
Sep 20, 2011
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Abstract
A method for producing a joint in at least two overlapping metal work pieces using a joining tool to obtain a mechanical joint between the overlapping work pieces, in particular joining by mechanical folding or pressure joining At least one of the first work piece and second work piece is a sheet material made of an aluminum alloy of the AA7000-series. A heat-treatment is applied to at least the work piece of 7000-series sheet material within 120 minutes prior to the production of the joint and/or for at least part of the time during production of the joint to temporarily reduce the tensile strength in the joining area of at least the work piece of said 7000-series sheet material.
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