Evaluation of AISI 316L Stainless Steel Welded Blind to Nozzle in a Pressure Vessel

70 mm austenitic stainless steel 316L Blind was welded to a 4" nozzle with double bevel groove joint type. The root pass is welded with Tungsten Arc welding method in both sides and is tested via liquid penetrant testing. The Filling passes were welded with SMAW method and is subjected to Ultrasonic testing. Also PMI test is performed on the weld metal to evaluate the effect of electrode composition on weld metal composition. The results show that there are some defects such as LOF in above the upper root pass and the PMI test were accepted for all of the electrodes however the AWS E309MoL have higher chromium and nickel alloy than others and thus has more resistance to corrosion.

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