this is a theoretical question, as it will be built into a chassis, with other tubes of the same and other dimensions.stress will come from low speeds and the mass it will carry, but no additional vibrations.The weldings will be expertly donelet's say the weight of 3 grown men (600lbs max) were to rest at the center of such a tube held firm at both edgesWould it buckle?thanks
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held firm at both edges it is not at all clear what you mean, if the tube is a horizontal beam supported at the ends, it is I don't think that it will support 600lbf concentrated load mid span, since you don't say what alloy or heat treatment I'm not going to bother calculating it, but I Have some experience with 1/8 wall (a third thicker than your tube) 6061 and my gut feeling is it will not be strong enoughOn the other hand if the tube is a vertical column, and the held firm at both edges prevents it from bucking, then the compression strength of 0.70square inches of any Al alloy I know of will be plenty for 600lbf
