THE EFFECT OF TEMPERATURE ON TENSILE STRENGTH IN DIFFUSION WELDING OF MARINE GRADE GREY CAST IRON WITH LOW CARBON STEEL

Abstract

Fusion welding and diffusion welding are two of the type of material joining methods by welding. In this study two type of materials were used which are low carbon steel and grey cast iron. Holding time, temperature and pressure are the parameters that include in the diffusion welding and these variables will be analysed by this project. This project is focusing on the effect of temperature on tensile strength in diffusion welding of marine grade grey cast iron with low carbon steel. The materials were identified and diffusion welding technical data and dimension of the specimens were studied before proceed with the joining process. Equipment and the welding method were also fabricated and developed. The joining process was carried out using three different temperatures 1000, 900 and 800 Celsius using 12.5 MPa bonding pressure and conducted under atmospheric condition. The joining using different temperatures were successful but the tensile test could not be carry out since the joining was broken during the process of machining. From the machining data, the best results that gained was at 900 degree Celsius because it may reflect back to the theory of diffusion that stated 80% of the melting point of the materials. Therefore, in the future study there are few improvements have to be considered in order to improve the results.