PetroStreet

We have to weld a flange of A182 F22 material to SS 347 pipe. Please guide.

Where buttering is not possible:
1. Preheat F22 side at 200 C
2. Weld with ER/E-309L and heat treat the joint when its above 12.7 mm thickness

Where buttering is possible:
1. Preheat F22 side at 200 C
2. Perform buttering on the F22 with ER-NiCr-3 (Inconel 82)
3. Heat treat after buttering at 750 C
4. Then weld with ER-NiCr-3 rods and E-NiCrFe-3 electrodes without preheating and post heating

Hope this would help.

Thanks.

Ashfaq,
One more question coming in my mind is regarding heat treatment of weld in 309L as you mentioned.
There seem a possibility of sensitization of stainless steel, what do you say about this?