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  1. Jap1

    E 309L welding with/without preheating

    I don't want to disclose the detail, but it's a melting furnace shell. I'm not concerned about a code and I would rather know about any cracking issues for this particular welding. I'm asking here because I think that hydrogen dissolves in austenitic weld metal and does not diffuse into the...
  2. Jap1

    E 309L welding with/without preheating

    I should have mentioned this earlier, but this is T joint that requires 3/8" fillet weld. The 304L chamber is reinforced with 2" mild steels. If anyone thinks that preheating is not necessary, I would like to hear your thoughts.
  3. Jap1

    E 309L welding with/without preheating

    Thank you for your valuable advice. I'll keep it in mind that preheating is needed. As I cheched carbon content of A36, it's quite high. We are located outside of US, but we build it for the US customer,so I'm not sure which code is applied. It's not a pressure vessel, as welders don't need...
  4. Jap1

    E 309L welding with/without preheating

    We have joints that need to be welded with E 309L Flux cored arc welding. One of the base metal is 2" thick mild steel (A36), and the other is 0.5-1" thick 304L. My question is whether pre-heating for the mild steel is required or not because of the weld metal of 309L. I believe that hydrogen...
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