| dc.description.abstract |
In today's industrial era, welding techniques have been widely used to join steel bars in building and machine construction. The strength of the weld is determined by the arc voltage, current, welding speed, penetration rate, and electrical polarity. The purpose of this study was to determine the hardness values of each ST42 steel specimen welded according to variations in welding current and electrode diameter and to compare the obtained hardness values with manual calculations. This research was conducted at the Material Test Laboratory, Polytechnic of Industrial Chemical Technology (PTKI) Medan, North Sumatra. The test specimens used were ST42 steel with dimensions of 50 mm in length, 10 mm in width, and 10 mm in thickness. The welding process used SMAW welding with the best polarity was performed with an E6013 electrode and diameters of 2.6 mm, 3.2 mm, and 4 mm.
Keywords: ST42 steel, welding current, electrode, hardness, netose, Vickers | en_US |
