Analisa Kekuatan Tarik dan Lentur Sambungan Las Baja ST-41 Dengan Media Pendingin Oli SAE10W-40

Abstract

The ST-41 material welding is commonly used by utilizing SMAW weld; however, it is needed to analyze the tensile strength where it is here as the reference to mechanical properties or the ST-41 ability in withstanding shear and bending loads. Besides the flow strength, another variable is cooling media also take effect towards the material mechanical properties but it needs to be conducted further research about this problem. The purpose of the research is to find out the effects of air and cooling media of SAE 10W-40 oil on the tensile and flexural static strengths after the welding process using the SMAW method. Then, the ASTM E8 using a threepoint bending method is utilized as the static testing to test the flexural static. Furthermore, after conducting the test and study, the result revealed that using oil liquid as the cooling media by dipping the welding result until cool had a lower tensile stress strength value of 296.378 MPa. For the air cooling, it had the highest tensile stress value of 326.888 MPa. Whereas values of oil flexural strength were lower of -1307,56 MPa, and air cooling had a higher flexural strength of -1549,701 MPa.