Determinação da taxa de desgaste abrasivo de revestimentos duros aplicados pelo processo TIG alimentado

Abstract

Due the growing demand of high superficial hardness and high wear resistance components, the surface coating are being widely used as solution to problems usually very expensive. Beyond providing a hard and resistant surface, the welded surface coatings are able to put together a ductile matrix and a low cost of components manufacturing. The GTAW (Gas Tungsten Arc Welding) have shown a really interesting solution when we seek for a low dilution and low metal matrix interference, once it's a low heat input process. This work presents an “abrasive wear resistance vs welding energy” analysis when GTAW process is used combined with automatic wire feeding. For this, rubber wheel wear experiments were done in Cr alloy steel wire deposition. All the samples were made using a SAE 1045 steel base. Seeking for an observation of abrasive wear resistance variance for different welding conditions, three different welding speed values were used, also keeping all the other parameters as constants. Despite the morphological analysis results have shown significant differences between the three welding conditions, the abrasive wear (rubber wheel) and the hardness tests have shown no expressive changes with the welding speed variation. Then observed that within the analyzed range, the welding speed slightly influenced the abrasive wear resistance of the samples, as well as the hardness.