304H+Grade P11

[Titirli123]

Good afternoon.

I have a situation where I have to weld a 304H pipe to a P11 pipe. (D=1800mm)

I was thinking at 2 options:
1. Welding directly with ENiCrFe-3 (no PWHT, no preheat)
2. Deposit on P11 pipe an EniCrFe-3 layer (above 6mm), after that make the PWHT of the bevel and then weld the P11 buttered with 304H pipe with ENiCrFe-3.

Does anyone encounter this situation, and can tell me which can give the weld the best results.

Thank you, and have a nice day!

 

[metengr]

Yes, your Option 2 above based on the configuration and thickness. No preheat and no PWHT would be stretch for P11.

 

[EdStainless]

Agree, use option 2 with correct preheat and PWHT. It is far more likely to provide reliable service.

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P.E. Metallurgy, Plymouth Tube

 

[HakiNoir]

I also agree with the option 2 with appropriate preheat.