Analysis of mechanical properties and microstructure on carbon steel JIS-S50C of metal inert gas (MIG) welding with electric current variation

Abstract

The tensile strength and hardness of the welding result is affected by a few elements, such as electric flow. This aim of this paper to investigation mechanical properties and microstructure on carbon steel JIS-S50C consequences of metal latent gas (MIG) welding with electric current variation. The method involved with welding the material uses the V butt association type. The varieties of the electric flow utilized were 80 A, 100 An and 120 A. The material utilized is a carbon steel plate JIS-S50C with thickness of 3 mm (elastic test) and 10 mm (hardness and microstructure test), and the anode utilized is the ER70S-6 terminal with width of 0.8 mm. The elasticity of the welding results is affected by voltage, a measure of electric flow, welding speed, measure of infiltration and electric polarity. From the result, it was observed that welding utilizing electric current of 120 A created the best tensile strength. The result of hardness decreases with increasing the electricity current of welding. the most. However, the microstructure of center weld metal is not quite the same as the Heat-Affected Zone (HAZ). In center, the microstructure of material has ferrite, ferrite and pearlite phase.