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Whiskey, Tango, Foxtrot | Without knowing your exact alloy, it is hard to know for sure. Most preheat reccomendations are not that hot, 250-450* F.
There are crayons you can buy to stick the steel with, that melt or change colors at different temperatures. Probably not neccessary for most applications however. Guy I worked with who was a very good welder thought too much heating (actually the rapid cooling afterwards) was worse than not enough. Usually if a heavy plate was hot enough to make spit sizzle (200*F) where we were welding to it, that was hot enough. Wrap or keep a little heat to cool slowly is as important. Most of the stuff we maintained was on rock crushers subject to extreme vibration, stuff breaking off was fairly common so you learned quickly by experience was works and what doesn't. | |
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Pre-heating thick metal before welding
