A question came to mind today. Say a pipe is threaded on its outer diameter in order to couple to another pipe to achieve a desired length. Material is taken from the pipe to make the threads which weakens the pipe, and as I understand it pipe threading is tapered, so that would take even more...
A question arose today... If 2 plates welded together at a right angle with fillet welds, are stronger than a single plate of the same thickness and material bent on a brake to form a right angle. I have always been informed that a welded part is stronger at the welds than the material itself...