Aplicação da técnica da dupla camada na soldagem do aço ABNT 1045

• Autor(a) principal: Azevedo, Alessandra Gois Luciano de
• Data de Publicação: 2002
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/2498
• topic: Ciência dos materiais

In this study, the double and triple layers technique in the ASTM 1045 steel welding was applicad with covered AWS E7018-1 and AWS E307-16 electrodes. Semi-V joints welding were employed in both kinds of technique, and electrode. Buttering with two layers were used with five energy ratios: 5/5; 5/10; 10/5; 10/10 and 10/16 kJ/cm for the AWS E7018-1 electrode. In the case of stainless steel AWS 307-16 electrode, the buttering with two and three layers were used in the following energy ratios: 5/5; 5/10; 10/5; 10/10 and 5/5/5; 5/10/10; 10/10/10. It was determined the cross section HAZ microhardness profile of the first layer of the buttering for each semi-V joint. In order to evaluate the efficiency of the applied technique regarding toughness, it was performed the HAZ Charpy-V impact test at 25ºC in the as welded and after heat treatment conditions. The weld metal Charpy-V toughness in the as welded conditions was also performed at 25ºC. The conclusion of the present study was that the double and triple layer techniques were efficient, since considering all energy ratios applied, using both types of electrodes, the as welded HAZ toughness was similar to values obtained for the HAZ after post welding heat treatment, and much larger than values of the base metal toughness.