Paper
Evaluation of the Specific Electric Behaviour of Covered Electrodes in Welding
- Authors:
- Alejandro García Rodríguez
- Abstract
- The present work is directed to the evaluation of the electric behaviour of covered electrodes and its main objective is to communicate to the international scientific community a novel methodology developed with this purpose. Methods of digital processing of the welding voltage and current signals and statistical methods based on non-parametric technical were used for the evaluation of the electric conduct of the process, using a feed by gravity dispositive for the elimination of the operator influence, in comparison with the process using standard electrodes. The proposed methodology allows the detection of destabilization events in anyone of the well-known transfer modes, in periods of arc and short circuit as well as during the re-ignition picks; and to evaluate the grade of the general electric stability of feed by gravity covered electrodes, proposing a novel index combining 5 parameters not referred before as stability criterion. A new index for the stability of the metallic transfer and another new index for evaluating the stability in the load transfer during the arc re-ignition were proposed. For validation of the developed methodology results obtained by means of metallographic technical, of visual inspection and of determination of the consumption indexes were analyzed, overcoming the well-known previous methods and allowing the evaluation of the electric behaviour in all types of covered electrodes and other welding processes, such as SAW, GMAW and GTAW.
- Keywords
- Specific Electric Behaviour; Coated Electrodes; Feed by Gravity
- StartPage
- 72
- EndPage
- 84
- Doi