【Help】Question regarding the weld evaluation of tube sheets and heat exchange tubes
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When first starting to work with pressure vessels, if the existing tube sheet has a thickness of t=42 mm and is made of 16Mn forged at grade 2, the heat exchange tubes are 25*2 in size and made of S30408 material; and welding with high-strength welds along with expansion jointing is required, then is it acceptable to proceed in this way for the weld assessment? 1. Perform butt welding (TIG welding) of S30408 and 16Mn plates with a thickness of t=5. 2. Carry out another butt weld (SAW welding) of S30408 and 16Mn plates with a thickness of T=25mm. 3. Conduct an additional assessment for a tube sheet with dimensions of 25*2 and a thickness of t=25. Is TIG welding also required for the second task? Ask questions for answers
Articles 2 and 3 should both be TIG welding