• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Doctoral Thesis
DOI
10.11606/T.18.2013.tde-03122013-223454
Document
Author
Full name
Paulo Cesar Moselli
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2013
Supervisor
Committee
Oliveira, Marcelo Falcão de (President)
Bolfarini, Claudemiro
Casteletti, Luiz Carlos
Kobayashi, Yukio
Pinto, Haroldo Cavalcanti
Title in Portuguese
Desenvolvimento de dispositivo, adaptado à tocha SATG, para a realização de revestimento duro, utilizando ligas, em forma de pó
Keywords in Portuguese
PAT-P

Resistência ao desgaste
Revestimento duro
SATG
Stellite 6
Abstract in Portuguese
Este trabalho inova a aplicação de revestimentos duros usando o processo de soldagem SATG (Soldagem ao Arco Tungstênio com Atmosfera Gasosa) utilizando ligas, em forma de pó, incorporadas diretamente à poça de solda. Devido à boa resistência ao desgaste, utilizou-se a liga Stellite 6, no substrato SAE 1020. Dados de microdureza Vickers, taxa de deposição, diluição, análise micrográfica e desgaste foram comparados com resultados do PAT-P (Plasma por Arco Transferido-Pó) e permitiram avaliar a técnica proposta. Os resultados mostraram um revestimento pelo processo SATG-pó livre de poros, sem oxidação na superfície e diluição superior, ao processo PAT-P. Porém, o consumo de gás foi menor, devido à redução da vazão do gás de arraste e da não utilização de gás plasma. A análise microestrutural evidenciou uma microestrutura similar, para ambos os processos, mas o processo PAT-P apresentou uma microestrutura mais refinada. Obteve-se, pelo processo SATG-pó semi-automático, microdurezas entre 400 e 500 HV e uma taxa de diluição de 5%, próximas aos valores do processo PAT-P. Quanto ao desgaste, observaram-se valores também bem próximos para os três processos.
Title in English
Development of an adapted device for GTAW torchs to perform hardfacing by applying powdered alloys
Keywords in English
GTAW
Hardfacing
Powder
PTA-P
Stellite 6
Wear resistance
Abstract in English
This work innovates the application of hardfacing by using the welding process GTAW (Gas Tungsten Arc Welding) using alloys in the powder form and directly embedded in the weld pool. Due to the good wear resistance it was used Stellite 6 alloy for hardfacing the substrate SAE 1020. Vickers hardness data, deposition rate, dilution, micrographic analysis and wear results were compared with the PTA-P (Plasma Transferred Arc-Powder) in order to evaluate the proposed technique. The results showed a coating produced by the process GTAW-powder free of pores, without surface oxidation and higher dilution in comparison with the PTA-P process. However, gas consumption was lower due to reduced flow of the carrier gas and as it was not used as plasma gas. Microstructural analysis showed a similar microstructure for both processes, but the PTA-P process presented a more refined microstructure. It was obtained, by the semi-automatic GTAW-powder process, micro hardness between 400 and 500HV and rate dilution of 5%, values close to the PTA-P process. As for the wear it was observed values very close too, for the three process.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2014-01-06
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
Centro de Informática de São Carlos
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2021. All rights reserved.