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Criteria for some methodologies of operative characterization of coated electrodes in welding in short-circuit metallic transference mode

In the present work, some methodologies for study of electric arc stability with covered electrodes in short-circuit metallic transfer mode, reported in science journal articles and books, are analysed. The analysis of this information has revealed: (a) different arc stability evaluation criteria in welding with covered electrodes, in relation to the voltage and current signal parameter under consideration, statistical processing of the variables and the relationships between the results of evaluations with different criteria; (b) insufficient information about the probabilistic distribution and the methodology for the statistical processing of the parameters taken into account, as well as their possible variations under different experimental conditions; (c) insufficient information about the influence of the automatic feed system on the autonomy of the coated electrode during the process. These aspects lead to distortions in the results of the characterization methodology; it is necessary to solve them in order to improve the evaluation of the covered electrodes' electric operability.