Well! the reason behind E3016L -15 recommendation is :
SMAW = E306L - 15 - It has lower FN and in turn better Notch Toughness values at -196 Deg C .- 15 covering produce much cleaner weld metal( lesser Oxygen , Nitrogen) that is must for achieving Notch Toughness values at -196 Deg C .
On Tue, Dec 22, 2020 at 9:11 AM sela <mechselastine@gmail.com> wrote:
ExpertsBelow requirement given in one LNG project...Welding Consumables:1. SMAW Consumables for Type 304L Stainless Steel Impact Tested at -196°C (-320°F).Consumable:ASME Specification SFA 5.4 in Part C, Section II Material Specification- AWS Classification E316L-15Certification and Testing:ASME Specification SFA 5.01 in Part C, Section II Material Specification- Lot Classification - C5- Level of testing - Schedule KTesting Requirements for each Lot of electrode:Each Lot of electrode shall be certified with the minimum following testing:- Chemical analysis of weld metal to meet the requirements for classification E316Lexcept the maximum phosphorus shall be 0.03% and the maximum sulphur shall be0.02%.- Delta ferrite determination per paragraph A6.9 of SFA 5.4. The weld metal shall bea maximum Ferrite Number of 2 FN.- Charpy V-notch impact test shall be performed on the weld metal in accordancewith SFA 5.4, paragraph A9.3.1. The weld test assembly shall be prepared andwelded with CVN specimens removed as per paragraph A9.3.5 of SFA 5.4. Fiveimpact specimens shall be tested at -196°C (-320F). The lowest and highest valuesobtained shall be disregarded. The three remaining values shall be equal to, orexceed, 20 mils of lateral expansion. The energy in ft-lbs and the percent ductilefracture areas shall be reported for information.Question1) what is the technical Reason behind for E316L -15 for Type 304L SS welding SMAW process -cryogenic , however for GTAW process ER308L specified for Type 304L welding.Regardssudhakar--
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