Abstract
This study aims to determine the effect of welding currents on the strength and toughness of SMAW welds with Impact testing. This study uses ST 37 Steel (Medium Carbon Steel), this steel including medium carbon steel. The material is treated with welding with a variation of current 90 Ampere, 110 Ampere, and 130 Ampere using SMAW DC welding, Impact testing is a test to measure the resistance of the material to shock loads. Impact testing simulates material operating conditions that are often encountered where the load does not always occur slowly but comes suddenly. The aim to be achieved in this study is to analyze impact testing for medium Carbon Steel welding position using a flat or down hand welding position, the type of seam used is V with a 90 ° angle. Specimens are tested for impact. Impact test results in the base metal and current variation specimens showed that the highest impact strength values were found in base metal, which was 146 joules and 1,825 joules / mm2, compared with the current variation group of 110 amperes, 130 amperes. The types of fracture that occurred were on the base metal and the 90 Ampere current specimen group was brittle fracture, and the 110 Ampere specimen group and the 130 Ampere specimen group were tenacious fractures.
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