DIFFERENT WELDING CURRENT ON MECHANICAL AND ELECTROCHEMICAL BEHAVIOR OF FCAW ASTM A36 CABON STEEL JOINTS

The effect of different welding current on microstructure, mechanical properties, and corrosion behavior of Flux-Cored Arc Welded (FCAW) ASTM A36 carbon steel joints is studied in the aim of work that used in the welding current like; 180A, 200A, 220A, 240A and 260A corresponding to heat inputs of 1.242, 1.380, 1.518, 1.656 and 1.749 kJ/mm, respectively. The welding process was performed according to the Welding Procedure Specification (WPS) and the Procedure Qualification Record (PQR). Corrosion behaviour of the heat affected zones, weldment and base metal were determined by Tafel polarization curves. It was found that all welding currents, the heat affected zones had the highest corrosion rates which followed by the weldments then the base metal. The welding current at 220A caused the highest corrosion rate in comparison with other welding currents. However, the effect of different welding currents had been studied and measured on microstructures and hardnesses for all specimens after FCAW processes.