Estudio del efecto corrosivo en juntas soldadas de acero API 5L X56 sometidas a tensión e inmersas en solución de cloruro férrico para procesos SMAW y GTAW-SMAW.

Abstract

This project demonstrates the behavior of two SMAW and GTAW-SMAW welding procedures, in a designation pipe API 5L X56 grade PSL 2, when subjected to a corrosive immersion environment. The welding procedures were performed for the root pass with electrode E7010-A1 in SMAW process and input material ER80S in GTAW process and the filling passes for both procedures with electrode E7018, these welding procedures meet the acceptance criteria and requirements of API 1104. The specimens are extracted from the weld bead under ASTM G58 and subjected to accelerated corrosion testing by immersion in ferric chloride for 10 24-hour exposure intervals according to ASTM G31, the loss of mass is obtained for each interval and the corrosion rate is calculated for each test piece. Obtaining for the SMAW-SMAW welding procedure a corrosion rate of 9.05 [mm/year] to 11.55 [mm/year] and for the GTAW-SMAW welding procedure a corrosion rate of 9.28 [mm/year] to 11.01 [mm/year], concluding that the difference is not significant between the calculated data.