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  1. sinampot

    preheating of 4340

    i got a lot of problem in welding high carbon alloys, specially when it comes to heavy welding like build up and/or hardfacing. will you guys give me some idea on the easiest way how to know the minimum preheating temperatures to use.
  2. sinampot

    preheating of 4340

    i am to build up a 40CrNiMoA or a 4340 with hardfacing material. At what minimum preheating temperature will I use?

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