Choosing filler material for PQR

I am preparing the PQR welded SA 516 to SS 304 (Groover weld design), FCAW process. Our stock is available E309LT1-1 and E308LT1-1, please advised which one we should choose and why.

Thanks.

I recommend electrode class E309LT1-1 or E309LT1-4 to prepare new PQR, see gas external shield in table 4 of SFA5.22 / A5.22.
Read more API RP 582 Table A.2—Stainless Steel Alloys.
ASME IX: should run root bead by GTAW.

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Most project specifications are preferable electrode ER309LT1-1.

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