OPERATIONAL AND CONSUMPTION EVALUATION OF A COATED ELECTRODE WITH RECTANGULAR NUCLEUS, DESTINED FOR BUILDING UP PIECES

Abstract

Introduction:
There is a problem of recovering parts with large worn surfaces in industry. Filling is applied by manual electric arc welding for this, with low productivity when using small diameters cylindrical electrodes, operated with low current intensities. 
Objective:
To evaluate operating and melting behavior of a coated electrode with a rectangular section core and a rutile coating.
Materials and methods:
Rutile coating was applied by pressing in molds. Operational performance was qualitatively evaluated by applying expert criteria. In addition, the consumption parameters were determined according to the standard (ISO 2401-72, 1972). The effect of core width and current intensity on consumption and dilution parameters was experimentally determined. Statistical processing was carried out with Statgraphics
software.
Results and Discussion:
Electrodes have good operating properties as excellent arc stability is obtained in 77.8% of them, excellent slag detachment in 100%, good appearance and cord health in 77% and 88.9% respectively. The average deposition coefficient was 0.16 g/A*min, deposition efficiency of 80.6% and dilution of 30.5%.
Conclusions:
Obtained electrodes showed good operating behavior during welding tests, which allows the filling process in parts affected by wear. Dilution in deposited by these electrodes metal is less than in equivalent cylindrical electrodes, which constitutes a significant advantage in recharge processes.