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I’m a mechanical engineer and have specified this stuff for years. I wouldn’t de-rate. I also wouldn’t bother with a torque wrench on a dry fastener. If you care enough to torque it, then care enough to have the appropriate conditions. If you REALLY care, then do something better than torque...
Dunno, bought an Eastwood TIG welder and butt welded .020” thick stuff (had to be perfect, chromed it) on day 1. Hadn’t touched a TIG in 20 years. Really not that bad.
For me I like TIG because I can reflow etc without adding more metal. In particular for sheet metal butt welds I find it easier. Always seems to end up cleaner too. Like anything of this sort, I'm quite sure there are many who have the opposite take on the whole deal.
An uncle of mine sold his company back 30 years ago. He had bought the master toolmaker’s Gerstner boxes with contents when the guy had retired a few years prior. People always borrowed from the MT so my uncle figured it would be good to keep them around.
Anyway, I get a call from him one...