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To safely join to ends like that you need to chamfer the inside of one part and the outside of the other part to form a scarf joint. That's what is done in wood to joining two pieces together to make the board longer. IIRC it's 1 to 8 or 1 to 12. So, for example, if the wall thickness of a tube is 1mm then the chamfer would be either 8mm or 12mm depending on which ratio you used. The higher the ratio the stronger the resulting joint. A butt joint is the WEAKEST type of joint.
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