STUDY OF THE EFFECT OF WELDING ON CORROSION BEHAVIOR OF API 5L X65 USING POLARIZATION AND IMMERSION METHODS

• Main Author: AHMAD DZIKRI JATMIKO (NIM : 13713051), AINUN
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/20872
• Institution: Institut Teknologi Bandung

The most common type of pipe is metal pipe due to its high strength and ductility, but usually metal pipe are produced in 6m size so that a welding method is needed to connect each pipe, but the welding method can causes the micro structure changes in the welding area. The changes in microstructure can make difference in mechanical properties and corrosion resistance in welding area <br /> <br /> <br /> <br /> <br /> The experiment was done on API 5l X65 which has been welded. The corrosion testing method is done by immersion method for 7 days and polarization method. Both are carried out under open space conditions, room temperature and atmospheric pressure with an electrolyte of 3.5% by weight of NaCl. <br /> <br /> <br /> <br /> <br /> From the results of immersion and polarization testing it is known that the highest corrosion rate occurs in the Heat Affected Zone because this area has microstructure with the shape of fine grains, then the next area that has the highest corrosion rate is the weld metal. The parent metal is the region having the lowest corrosion rate among the other welded regions. From the results of immersion testing it is seen that the type of corrosion that occurs in all welding areas is uniform corrosion.