Aplicação de revestimento duro utilizando o processo arame tubular com e sem adição de arame não energizado para diferentes tipos de consumíveis

Abstract

The crop of sugar cane is a major agricultural activity in Brazil, providing a wide international market for ethanol and sugar. One of the factors affecting production costs is the maintenance of equipments affected by damage related to the mass loss of wear mechanisms. To minimize losses by wear mechanisms are used hardfacing deposits with different welding processes and consumables, such as the high chrome content (FeCrC) with and without addition of metal elements, formers of carbides. The alloying chemical composition and application technique can contribute to occurrence of discontinuities like cracks and porosity, which depending of the application may influence in the wear increase. Thus, the main objective of this work is to study the technique for hardfacing application on carbon steel plates, using the FCAW Self-shield welding process with and without addition of notenergized wires looking for improvements in wear resistance and reduce the appearance of discontinuities like cracks and porosities. Commercial self-shield hardfacing wires of FeCrC+Ti and FeCrC+Nb alloys with 1.6 mm of diameter were used like energized wire. In not-energized wire addition were used two commercial self-shield hardfacing wire of FeCrC and FeCrC+Nb alloy wires with 1.6 mm with the commercial self-shield hardfacing wired of FeCrC + Ti alloy like energized wire, and the ER308LSi wire with 1 mm in diameter with the commercial self-shield hardfacing wired of FeCrC + Nb like energized wire. The wear resistance of the hardfacing deposits was determinate using the dry sand rubber wheel test following the ASTM G65-00 code. the results showed that the consumable condition of FeCrC + Nb wire with addition of ER308LSi, presented high wearing resistance, followed by the consumable conditions of FeCrC + Ti with the addition of FeCrC and FeCrC + Nb. Hardfacing deposits without the addition of not-energized wire showed the lowest values of wear resistance. The hardfacing deposits made with the commercial self-shield hardfacing wire of FeCrC+Ti alloy showed satisfactory results in terms of occurrence of discontinuities.