CHARACTERIZATION OF DEPOSITS OBTAINED WITH COATED TUBULAR ELECTRODES FOR HARDFACING OF FARM MEANS SUBJECTED TO ABRASIVE WEAR IN THE SUGAR SECTOR

Abstract

Characterization results of microstructure and hardness of deposits are present; these  were obtained by hardfacing by manual welding with coated tubular electrodes. The  electrodes contain ferroalloy type FeCrMn as alloying charge in the rod core with two  ranges of grain (one between 0,1 and 0,25 mm and other less than 0,1 mm) and the  applied coating is the basic type. The welding current (direct current with inverse  polarity) was set from 80 to 140 A, with 20 A steps, keeping the tension between 26 and  28 V and welding speed 10 cm/min. The microstructure was analyzed using Scanner  Electron Microscopy with microanalysis. The hardness was determined by Vickers  method. The type of microstructure was hipoeutectic in all experimental conditions,  being slightly smaller and disperse at the condition of 80 A and ferroalloy with grains  between 0,1 and 0,25 mm, which also showed greater hardness.