EXPERIMENTAL STUDY ON DETERMINING THE PARAMETER RANGE OF DOUBLE PULSE MIG WELDING ON THE SHAPE AND MICROSTRUCTURE OF AA6061 ALUMINUM ALLOY BUTT WELDED JOINTS

Abstract

This paper presents a study on the influence of welding parameters and double pulse modes on the weld formation of AA6061 aluminum alloy through visual inspection. The research utilizes butt joint welding of 4mm thick AA6061 aluminum alloy plates with ER5356 welding wire. Welding current, welding voltage, pulse frequency, base current ratio, and base time ratio are experimentally investigated and independently assessed for their impact on weld formation through weld shape. The research results identified the range of parameters that enhance weld quality based on their independent effects as follows: Ih ≈ 230-240 A, U h ≈ 19-20 V, Hz ≈ 2-4, Ibs ≈ 70-80 %, Tbs ≈ 70-80 %. The weld joints are executed using the parameters selected from the identified range to evaluate the external shape and microstructure obtained with the chosen welding material. The comprehensive evaluation of the achieved shape and structure serves as the foundation for applying the identified technological parameter ranges to welding applications of this joint type. The comprehensive evaluation of the obtained weld shape and structure serves as the foundation for applying the identified technological parameter ranges to welding applications of this joint type.