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Can ASTM A 312 ss 304 and 316 pipe can be welded together, which filler wire to be use for welding
Yes. 316.
or E/ER 309, or E/ER 308L. Check your WPS/PQR
As per API RP 582 ,you can use,
E308 (SFA 5.4) for SMAW / ER308 (SFA 5.9) for GTAW
OR
E316 (SFA 5.4) for SMAW / ER316 (SFA 5.9) for GTAW