Avaliação da influência do diâmetro de arames-eletrodo na taxa de fusão no processo MIG/MAG

Abstract

The objective of this work is to analyze the influence of the electrode wire diameter on the melting rate in the MIG/MAG process, using the comparison between the conventional configuration of a 1.0 mm diameter solid wire and a special configuration. formed by three wires with a diameter of 0.6 mm fed at the same time. This ensures the same current density by eliminating the influence of the Joule effect variation, so that only the effect of the As/V (surface area over volume) geometric parameters ratio is observed. For valid comparisons, the power supply parameters were kept constant throughout the tests. Based on the information obtained, it was concluded that the configuration consisting of three thin wires obtained an increase of only 0.7% in the deposition rate. Therefore, it can be concluded that a remarkable increase in melt rate observed for thin wire use cases (approximately 1.5% for each 0.1 mm of wire diameter reduction) is the contribution of the Joule effect as a result. increasing current density.