I have a scope of work to seal weld two plugs (3/4" dia tapered S/S 304) to an existing tube (SA-179 x .083") and tube sheet (SA516-70 x 1-1/8") using GTAW process and ER309L filler material. I plan to use a two-pass process to accomplish this work. My question is: Do I need to consider preheat/ heat maintenance above 50° F (Minimum on WPS) due to the thickness of the tubesheet.
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Preheat reuirements for fillet welds 1
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