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Metal tube joint basics

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BrianW

Well-Known Member
Joined
Jul 2, 2018
Messages
140
Location
Altus SW Oklahoma
Joining square tubes to be welded takes one straight cut.
Jointing round tubes to be welded takes a hole saw on a drill stand.
Joining tubes to be bolted can use a sawn slot, and a flat profile end fitting to be welded on a long tube axis. But a method which always seemed like an eye-sore was the pinch and drill method which collapses the tube end, which is then drilled. This has been used on some aircraft - but it always seemed weak & fatigue prone to me. But I know better than to trust gut-feelings in these matters. Is there any design analysis on flattened tube joints?
 
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