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Also, that is a poor area for a weld which is to be stressed. That weld is made at the apex of a bend. The material on the upper side of the bend will be stretched, and therefore, thinner at that point. The material thickness at the crack looks suspiciously thin to me. I've drilled a few holes in my ND tower and I can tell you that it is easily twice that thick (at least if your photo shows it right.)
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