In Gemlik Fertilizer production area, there are tanks with a diameter of 40 m and a height of 15 m where water is stored. Carbon steel strips are placed on the bottom and side walls of the tank. Because the strips deformed over time, they have been re-coated with strips of 8-10 mm thickness. The joints of the strips were welded by electrode welding. After welding was completed, it was checked by Magnetic Test.