Joints Properties of One Side Welded of Ship Materials with Variation of Angle Groove

Indonesian National Transportation Safety Commission based on data from the period 2003-2008 and The Study for the Maritime Traffic Safety System Development Plan states that 21% of the cause of the accident was the failure of Indonesian ship in the structure of the ship (hull structure). This study aimed to investigate the effect of variations in the angle groove of one side welding. Material used is low carbon steel LR grade A in a thickness 12 mm were welded using GMAW (Gas Metal Arc Welding) with a angle groove 20°, 40° and 60°. The physical properties examined with an optical microscope and measured mechanical properties with regard to strength, hardness, and tougness using tensile test, hardness test and impact test Charpy Vickers respectively. The test results show the microstructure of the weld, HAZ, and base metals has the same structure is ferrite and perlite. From the results of mechanical tests showed tensile strength is highest in the 40° angle groove is 338.9 MPa. The values of absorbed energy approximately 170 J, which was 58 % of that of weld raw materials.