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Warning: An old timer in Gary told me my weld prep was too clean
He said on the old 2-inch thick plate we were working, a perfectly shiny bevel could cause undercut on the first pass. He told me to leave a light mill scale, maybe a 32-grit scratch finish, to give the arc something to bite. I tried it on a pressure vessel job last month and my root passes stuck way better. Anyone else get that kind of counterintuitive tip from the older guys?
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