The Effects of Shielded Metal Arc Welding (Smaw) Welding On The Mechanical Characteristics With Heating Treatment inn S45c Steel

Steel material has been used mainly for making tooling, automotive components, other household needs, power generators to frame buildings and bridges. This study aimed (1) to analyze the mechanical Characteristics of S45C steel with and without heating treatments, and (2) to analyze the temperature of heating treatment which could result in the maximal strength of S45C steel after the welding process. The research was conducted in the laboratory of mechanical engineering study program, Departement of mechanical Engineering, Christian university of indonesia paulus, makassar. The method used materials, instruments, and the dimensions determination of specimen based on the proposed testing standard, Next, was to determine the mechanical caracteristics of the S45C steel wich had been welded and heated.The tensile specimens, the hardness specimen, the impact specimen, and microstructures of which,each of the 3 specimens was the specimens was the specimen without treatment, the spesimen with the welding wthout heating and the specimen of 150 degrees C, 250 degrees C, 300 degrees C. The research results indicated that the treatment process of 150 degrees C, 250 degrees C and 300 degrees C produced the changes of mechanic charateristics with the tensile strength of 42 kgf/mm2 when the temperature had reached 300 degrees C, but at the temperature 300 degrees C, the its toughness would decrease to Hi = 0.836 j/m2 and its hardness would increase to 40.83 at the temperature of 300 degrees C. The value of the maximum strengs was reached at the heating temperature of 300 degrees C for the tensile strength and the hardness, while at the temperature of 300 degrees C its impact value would decrease.