Pengaruh Variasi Arus Pengelasan Terhadap Kekuatan Tarik pada Sambungan Material Baja Karbon Rendah ASTM A36 dengan Proses Pengelasan SMAW

Abstract

This research aims to determine the effect of variations in welding current (80A, 100A, and 120A) on the tensile strength, yield strength and strain in ASTM A36 low carbon steel joints with a thickness of 10 mm using the Shield Metal Arc Welding (SMAW) process in the horizontal or bottom position. hand, the type of clamp used is a V loop with an angle of 70° and an E7018 electrode with a diameter of 2.6 mm. The research results show the highest tensile strength value (446.21 MPa) at a current of 100A, the lowest value (435.22 MPa) at a current of 120A, and an intermediate value (440.72 MPa) at a current of 80A. The highest yield strength value (302.07 MPa) was recorded at a current of 100A, the lowest value (278.03 MPa) at a current of 120A, and an intermediate value (286.61 MPa) at a current of 80A. The highest strain value (30.66%) at a current of 100A, the lowest value (23.50%) at a current of 120A and an intermediate value (26.50%) at a current of 80A. The results of this research are in accordance with the technical specifications for ASTM A36 material and E7018 electrodes, meeting the specified quality standards. The characteristic of fracture that occurs in the tensile test is ductile fracture. This research recommends an optimal welding current of 100A for the SMAW process.