Avaliação da influência da polaridade da corrente de soldagem na taxa de fusão dos eletrodos revestidos

Abstract

The aim of the present work is to verify the difference in the fusion rate between the polarity positive electrode continuous current(CCEP) and the polarity negative electrode continuous current(CCEN) for the basic and rutile electrodes. For this purpose, tests were carried out whith a manual welding of the basic electrodes (E7018) and rutile type electrodes (E6013) of diameter 2.5 mm are performed. To determine the melting rate of the electrode, they were melted using the same 90 A welding flux in the CCEP and CCEN polarity. Thus, from what was observed in the tests, it was verified the veracity of the literature on the subject that states that the polarity affects in a significant way the shape and dimensions of the fusion puddle, mode of transfer of metal addition and arc stability. It was also observed that the fusion rate for both types of electrodes was higher in the CCEN polarity, and that the electrodes E6013 presented a higher linear fusion rate (core length / s) than the electrodes E7018, since these electrodes melt more slowly due to their greater coating thickness in relation to the electrode E6013. However, the electrode E7018 presented a higher deposition rate than E6013, this fact is justified by the considerable amount of iron powder in its coating (which also justifies its lower linear melting rate)