The effect of wollastonite on operational characteristics of AWS E6013 electrodes

Abstract

The main objective of this work was to assess the operational behavior of ANSI/AWS A5.1-91 E6013 type electrodes when 0, 8 and 16 % of quartz (100 % SiO2) is replaced with wollastonite (Calcium Silicate, 50 % SiO2 - 50 % CaO) in the coating composition. The electrodes were tested through bead-on-plate welds in flat position on DC, both polarities, and on AC currents. Arc stability, fusion rate and deposition rate were used as operational characteristics evaluation criteria. The results suggested that the replacement of quartz with wollastonite, that increased slag basicity, kept, or even improved, the typical excellent operational characteristics of E6013 type electrodes

Operational behavior assesment of coated tubular electrodes for SMAW hardfacing

“…Thus, the manufacturers and users usually do not take into account very important aspects to evaluate the quality of the coated electrodes, such the ones related to the metal transfer. Information to this respect is found only at research level (Farias et al, 2004;Scotti et al, 1985Scotti et al, , 1999Farias et al, 1997Farias et al, , 1998Farias and Quites, 1993;Farias and Scotti, 1986a), despite the fact that there are no recent pieces of work on this subject, as can be noticed in the present bibliographic reference list. For hardfacing application, even at experimental level, reported studies on these aspects were not found, regardless the developed methodologies for coated electrode evaluation (Souza and Scotti, 1996) is also able to cover this application.…”

“…The variety and interactions of the coating components makes the prediction of electrode performance well complex (Farias et al, 1997(Farias et al, , 1998(Farias et al, , 2004. Besides the chemical composition, the "coating ratio" (ratio between the external diameter of the coating and the rod) is one of the determining aspects of the electrode behavior (Farias and Scotti, 1986b).…”

Incertidumbre de la medición de masa en la determinación de los parámetros de consumo de electrodos de recargue

“…La medición de masa es imprescindible para evaluar el electrodo en cuanto a parámetros de consumo, conforme muestran los trabajos publicados por [10][11][12][13][14][15]. Estos autores midieron la masa de los electrodos y de las probetas antes y después de la soldadura para evaluar la eficiencia del depósito.…”

“…Cada uno de estos sistemas de medición posee sus particularidades y por lo tanto las fuentes de errores son diferentes, también, el cálculo de la incertidumbre [7][8][9]. Un caso particular de esto lo constituye la evaluación del rendimiento de materiales de aporte donde se efectúan mediciones de masa, conforme a lo presentado por [10][11][12][13][14][15].…”

The Influence of Calcite, Fluorite, and Rutile on the Fusion-Related Behavior of Metal Cored Coated Electrodes for Hardfacing

“…The coating importance in the SMAW electrode performance is well known and several researchers have recognized the complexity involved in the design of new coatings (Ref [1][2][3][4][5][6][7][8][9][10]. This subject is still relevant, despite the fact that it has been systematically studied for a long time, as exampled by Vornovitskii and VagarovÕs (Ref 11) and Pokhodnya et alÕs (Ref 12) work.…”