Banca de DEFESA: RAFAEL BEZERRA AZEVEDO MENDES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : RAFAEL BEZERRA AZEVEDO MENDES
DATA : 17/12/2018
HORA: 09:00
LOCAL: Sala de Aulas do PPGCEM - UFRN
TÍTULO:

EFFECT OF TORCH OSCILLATION PATH (TRAPEZOID AND TRIANGLE) ON ABRASION RESTENCE IN WEAR-RESISTANT WELD DEPOSITS

PALAVRAS-CHAVES:

ASTM G65 Standard, arc oscillation technics, Sugarcane industry, abrasive wear and hardfacing

PÁGINAS: 112
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Mecânica
RESUMO:

For the sugar and alcohol industry, one of its main concerns is directly related to premature wear of its equipment. Thus, adequate planning of preventive maintenance stops is a way of controlling the mechanism of degradation that occurs in the process of sugarcane milling. In this case, a means of increasing the life in service of the components of the mill (shirt, hammers, shredders, others) is by the application of welded deposits especially resistant to abrasion, also known as hard coating. In this work, the samples containing the hardfacing layer was produced by electric arc welding, with one, two layers containing three pass, and 50% overlap between pass. The addition metals used were two self-protected tubular wires with 1, 6 mm diameter, the first tubular wire of FeCrC + Nb alloy and the second FeCrC + Ti, and ASTM A36 steel was used as the base material. In the evaluation of the effect of the weaving on the deposit resistance, triangular and trapezoidal movements were performed, and welding without oscillations. For the quantification and analysis of the morphology, hardness and abrasion resistance of the coatings, a tribometer according to ASTM G65, Rockwell C scale durometer and ImageJ® program was used. The results showed variations in the formation of cracks, and the welds performed with oscillations generated fewer cracks in the second coating layer. The hardness varied with the type of material and the alloy formed by the FeCrC+Ti tubular wire obtained a hardness value higher than FeCrC+Nb, but in the abrasion tests the alloy that most resisted was with addition of niobium and using the trapezoidal weaving effect during welding.

MEMBROS DA BANCA:
Presidente - 1350249 - RUBENS MARIBONDO DO NASCIMENTO
Externo ao Programa - 2414250 - MEYSAM MASHHADIKARIMI
Externo ao Programa - 1938946 - NICOLAU APOENA CASTRO
Externo à Instituição - CELINA LEAL MENDES DA SILVA - IFRN