Covered electrode selection for dissimilar materials welding

Dear experts,
Please suggest me welding consumable for preparation of PQR. Covered electrode for welding P6 (ASTM A 276 type 431) which is Martensitic stainless steel with (carbon steel) P1.
Welding P6 with P1
Welding P6 with P6

Thanks

Learn more recommendation of welding consumables or base metal in
API RP 582 - Welding Guidelines for the Chemical, Oil, and Gas Industries.

Annex A: Table A.1 - Carbon and Low-alloy Steel
Annex A: Table A.2 - Stainless Steel Alloys

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I never run these procedures.
You could find out electrode classification AWS A5.4 E309 and E410/430.