The Effect Of Underwater Wet Welding Variables On The Corrosion Rate Of Low Carbon Steel Weldment

Abstrak

Underwater welding is a method used in the repair and maintenance process in offshore areas. This is because there is no other alternative for joining damaged parts of construction to fixed offshore structures. This study aims to determine the effect of welding parameters on the value of the welding corrosion rate under the air material of A36 Plate and A106 Pipe. In this study, the welding process was carried out with the type of Shielded Metal Arc Welding (SMAW) with a welding position of 1G in a pool with a depth of 3 meters and 10 meters. The electrodes used are electrodes of type E6013 and E7018 with an electrode diameter of 4 mm AWS specifications which are varied into two types of currents, namely 90 A and 120 A. The tests carried out are corrosion testing using the Linear Polarization method, and Electrochemical Impedance Spectroscopy (EIS) using 3.5% NaCl corrosive medium. After testing, the results showed that the highest corrosion rate occurred in welding with the parameter 120A electrode E6013 and at a welding depth of 10m, and the best corrosion resistance or the lowest corrosion rate was the welding current parameter of 90A using the E7018 electrode and the welding depth of 3m. This occurs in the second material, namely the A36 plate and the A106 pipe.