Investigation of the arc stability during self-shielded flux-coed arc welding with exothermic additions

Abstract

Abstract In the conditions of energy crisis an important issue is the increase of energy efficiency and productivity of welding and hadfacing process. The article substantiates the perspective of using exothermic additives introduced into core filler for flux cored wire arc welding process, as a relatively cheap additional heat source, reducing energy consumption for melting of filler materials, and increasing the deposited rate. This article studies the influence of the introduction of the exothermic addition (EA), as well as the ratio (CuO/C) and CuO/Al on arc stability for the FCAW S process. It was determined that various methods can be used to evaluate arc stability, which can be divided into two groups: graphical (current and voltage cyclograms, box plots with frequency histograms, ellipse parameters plotted on current and voltage cyclograms) and statistical (standard variation and coefficients of variation for welding current and arc voltage). In this paper, a comprehensive evaluation of arc stability depending on the composition of the cored wire filler was carried out. Mathematical models of mean values, standard deviation, coefficient of variation for welding current and arc voltage were developed.