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Well, the Brewster Buffaloes delivered to Finland had some non-load carrying structures spot welded. These welds were prone to failures and had to be replaced with riveted joints.
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US plane...US duralumin.
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The German duralumin alloys in general had a lower cupric content that lends itself well to welding applications in comparison to the US alloys.
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US duralumin does not weld well due to the high cupric content.
All the best,
Crumpp