Eventos Anais de eventos
COBEF 2017
Congresso Brasileiro de Engenharia de Fabricação
IMPLEMENTATION OF DOUBLE AR/(AR+CO2) SHIELDING ON GTAW OF AISI 316L STAINLESS STEELS
Submission Author:
Laura Silva Macedo Lima , MG
Co-Authors:
Saber Namouchi, Leonel Abreu Dimas, André Chimicatti Fabrini, Pedro Paiva Brito
Presenter: Laura Silva Macedo Lima
doi://10.26678/ABCM.COBEF2017.COF2017-0688
Abstract
In the present study, a modified GTAW torch operating with an inner flower of pure Ar gas and an outer flow of mixed Ar-CO2 gas was employed for welding AISI 316L stainless steel plates. Cross-section samples from the welds were analyzed in terms of their general macrographic aspect, microstructure and hardness distribution. The influence of the torch modification on oxidation and deterioration of the tungsten electrodes was also investigated. It could be verified that increase the percentage of CO2 in the outer layer led to an increase in penetration depth. In addition, the results indicated that the inner Ar layer worked properly as a barrier protecting the electrode from destructive oxidation.
Keywords
GTAW, Double Shielding, Penetration, Stainless Steel
