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post #16 of Old 02-23-2012
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Welding aluminum WEAKENS it, depending on who's running the numbers and how conservative he wants to be, this can be as much as 50% loss within 1" of the heat-affected zone, though many will go with 15%. Down at the base, most of the load is compression, it may not matter that much. Hence the sleeve.

Steel is just the opposite. If 40 KSI material is welded, the rod is often in the 70 KSI range.
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