Which type of welding is best for type 316L stainless steel?
Welding electrodes: E316L-16 for SMAW or ER316L for GTAW/GMAW.
One more thing, welding procedure and project specification will detail the specific welding consumables.
More guide in API RP 582 tabke A.2
Any recommend preheat and interpass temperature?
Follow project specifications or API RP 582 table 4 at material group P-No. 8:
Thanks, I call back check in our project are required 150 deg C max and WPS allowed max. 215.
So, do we need to revise WPS or not?
Maybe, should get Client approval before welding.
My experience: no need but your supervisor/welders make certain to control IP are not higher than temperature specified in spec. 150 deg. C during welding.
Please discuss with your client to get decision