Banca de QUALIFICAÇÃO: LUAN MAYK TÔRRES COSTA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUAN MAYK TÔRRES COSTA
DATA : 26/11/2018
HORA: 09:00
LOCAL: Sala de aulas do PPGCEM
TÍTULO:

INFLUENCE OF PVC AND ALUMINUM COATINGS ADDITION  IN E-7018 ELECTRODE TO THE MOLTEN ZONE OF ASTM A36 STEEL 

PALAVRAS-CHAVES:

microstructure, molten zone, PVC films, aluminum, E-7018

PÁGINAS: 136
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Metalurgia de Transformação
ESPECIALIDADE: Soldagem
RESUMO:

The shielded metal arc welding (SMAW) presents competitive advantages that this union process as one of most important in industrial scale. However, the humidity absorption is a problem that requires special cares to stock the electrodes. Trying to control this problem, PVC films and aluminum ink coatings were applied in E-7018 electrodes to weld ASTM SA36 steel. In this paper was realized a comparative study among different welded samples: E-7018, pure and with coating, and using BRH4-R electrode. The molten zone characterization of these samples is a sequential continuation of the works developed by RAMOS (2015) and SOUZA (2017). Through the optical and scanning electron microscopies, it was observed that the molten zone microstructure, in all samples, is composed by Widmanstatten, acicular and polygonal ferrite, upper bainite, ferrite-carbine aggregates and, in some regions, MA micro-constituent. The EBSD technique, in addition to the others methods, confirmed that the welding using BRH4-R electrode formed coarser grains than the others samples. Acicular ferrite grains were found in all samples, and the BRH4-R provided less formation of acicular ferrite, while there is no difference among the E-7018 pure and covered by aluminum or PVC.

MEMBROS DA BANCA:
Presidente - 2156996 - AUGUSTO JOSE DE ALMEIDA BUSCHINELLI
Externo ao Programa - 1652765 - MAURÍCIO MHIRDAUI PERES
Externo ao Programa - 1938946 - NICOLAU APOENA CASTRO