Evaluation and Qualification of the Brazing of Stainless Steel Joints Employing Silver-Based Filler Metals for Application in Aircraft Pressurized Oxygen Systems

The oxyacetylene torch brazing of stainless steel plates using silver-based filler metals (Ag–Cu–Zn–Sn) was investigated. Filler metals with silver quantities of 25%, 35%, and 45% were used to evaluate the influence of silver contents on the processing of joints. The brazed joints were evaluated in...

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Bibliographic Details
Published in:Metallography, microstructure, and analysis microstructure, and analysis, 2023-06, Vol.12 (3), p.433-443
Main Authors: Siqueira, Lucas Oliveira, de Mello Picchi, Ivan Bezerra, Simões Andrade, André Luís, Torres López, Edwar Andrés, de Lima, Nathalia Bezerra, de Abreu Santos, Tiago Felipe
Format: Article
Language:English
Subjects:
Brazed joints
Characterization and Evaluation of Materials
Chemistry and Materials Science
Copper
Cross-sections
Diamond pyramid hardness
Fillers
Materials Science
Metallic Materials
Nanotechnology
Oxyacetylene
Peer-Reviewed Paper
Shear strength
Silver
Solid solutions
Stainless steels
Steel plates
Strength testing
Structural Materials
Surfaces and Interfaces
Thin Films
Tin
Torch brazing
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Summary:The oxyacetylene torch brazing of stainless steel plates using silver-based filler metals (Ag–Cu–Zn–Sn) was investigated. Filler metals with silver quantities of 25%, 35%, and 45% were used to evaluate the influence of silver contents on the processing of joints. The brazed joints were evaluated in accordance with brazing qualification standards. Further, the number of pores from cross sections in different samples for each brazed joint condition was evaluated. The results revealed that the brazed joints exhibited pores, however, did not exceed the maximum percentage allowed in the same cross section. Scanning electron microscopy analysis revealed that the brazed joints are mainly composed of Ag solid solution, Cu solid solution and (Ag + Cu) eutectic microconstituent. Furthermore, the Vickers microhardness test indicated the presence of microstructural discontinuities in the joints 25 and 35 Ag. Finally, the shear strength testing revealed that the joint 45 Ag has a higher average performance.
ISSN:2192-9262
2192-9270
DOI:10.1007/s13632-023-00955-1