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  • Users: ballinbuck
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  1. ballinbuck

    Welding 4140: Preheat High?

    I am trying to find out how much preheat to do when welding 2.50" thick 4140 bar to 1026 tube. I used Lincoln's calculator and got a preheat of 525 degrees F. I'm not very experienced with welding but this seems a bit high to me. Here are the 4140 chemical properties I took into account...

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