Caracterização do metal de solda de eletrodos inoxidáveis austeníticos da classe AWS E309

• Ano de defesa: 2002
• Autor(a) principal: Rodrigues, Carlos Eduardo Aguiar Lima
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Ciência dos materiais
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/2504

The main purposes of this work are characterize and evaluate ANSI/AWS A5.4-92 E309 Electrodes Weld Metals from three different sources. The evaluation was made analyzing the following aspects: operational qualities; chemical composition; microstructures; contents of ferrite, oxygen and nitrogen; mechanical properties and inclusions characteristics (contents, size distribution and chemical composition). The welding processes were made according to ANSI/AWS A5.4-92 standards. The welding parameters (voltage and current) were monitored by a digital acquisition system and they were controlled by the operator within the recommended ranges. The metallographic samples were attacked with Murakami’s reagent. The results suggest that some operational characteristics of the electrodes must be considered during the procedure qualification or evaluation. It can be inferred that: the contents of some important chemical elements are next to the standard limits or out of them; the δ-ferrite content and its morphology depends on the manufacturer and this fact can lead to relevant differences in the welding metal tensile strength, ductility and tenacity; the inclusions existent in the welding metals have many phases and spherical shape; this inclusions are rich Mn and Si and can include Cr, Ti and other elements in their phases.