Dear All,
pls. go through the below scenario and provide your feed backs.
thanks.
Job Details : -
1. Material : SA516 Gr.70N + UNS N 08825. ( 40+3 mm)
2. PWHT : Yes
3. Impact : Not required
4. Vessel Size : ID-910 mm ; TL to TL -2000 mm
5. Opening size : 6"
6. Overlay welding is for corrosion resistance only. Not considered in design thickness.
Background : Since there is no accessibility to do the overlay welding on closing Circ seam (Cat – b). So I have to include the clad thickness in the butt joint. I.e ( 5-6 mm GTAW root with ER NICrMo-3 & Rest with SAW EM12K)
Query : I have two PQR as below mentioned, Can I combine both PQR to do the above butt welding?
PQR 1 :-
1. Material : SA 516 Gr.70 + UNS N 08825 TO SA 516 Gr.70 + UNS N 08825
2. Thk : 13 + 3 mm
3. Process : GTAW
4. Consumable : ER NiCrMo – 3 (F – 43)
5. PWHT : Yes.
PQR 2 :-
1. Material : SA 516 Gr.70N TO SA 516 Gr.70
2. Thk : 38 mm
3. Process : SAW
4. Consumable : EM12K (F – 6)
5. PWHT : Yes.
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