Details

Autor(en) / Beteiligte

• Araújo, Helen Rodrigues
• Torres, Edwar Andrés
• Apolinário, Luis Henrique Rodrigues
• Vicente, Andre de Albuquerque
• da Silva Júnior, Deusdedit Carlos
• Santos, Tiago Felipe de Abreu

Titel

Evaluation of mechanical performance and microstructural aspects of AISI 304 stainless steel welded joints produced by controlled short circuit GMAW and GTAW

Ist Teil von

• Welding in the world, 2022-12, Vol.66 (12), p.2443-2459

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Recently, developments in the technology used in gas metal arc welding (GMAW) have provided greater control over the parameters, reducing the heat generated, in addition to addressing limitations previously linked to the conventional process. In this work, in comparison to the gas tungsten arc welding (GTAW), the application of the controlled short-circuit GMAW in AISI 304 austenitic stainless steel was evaluated, with and without the use of purging gas to protect the root pass, analyzing the microstructural characteristics and the mechanical behavior, through the microscopy analysis, microhardness, bending, and tensile tests performed on the joints. The heat input associated with the controlled short circuit has shown a significant reduction concerning those produced by the GTAW, affecting the dilution. The application of different processes did not modify the microstructural characteristics due to the similarity in the composition of the filler metals used, presenting the solidification mode in the fusion zone, of the ferrite–austenite. The application of the controlled short circuit resulted in higher microhardness, with 211 HV, the highest value. From the results of the bending tests, it was possible to verify that the ductility of the material was not affected by the application of arc welding processes and was not influenced by the lack of purging protection in the root. The tensile strength limit values associated with the different applications satisfied the minimum requirements for the used materials, and the application of the controlled short circuit without purging has shown the highest value, 615 MPa.