A study on microstructure and mechanical performance of gas metal arc welded AISI 304 L joints

Arc welding is a widely applied process in the fabrication of stainless steel structures. Various difficulties may arise in joining of these steels, particularly if high heat input is used. The main aim of this study is to evaluate the influence of heat input on microstructure of the joint region an...

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Bibliographic Details
Published in:Materialwissenschaft und Werkstofftechnik 2022-09, Vol.53 (9), p.1043-1052
Main Authors: Ezer, M.A., Çam, G.
Format: Article
Language:English
Subjects:
Arc welding
Austenitic stainless steel
Austenitic stainless steels
Austenitischer Edelstahl
Base metal
Base plates
Gefügeausbildung
grain coarsening
Heat affected zone
heat input
Kornvergröberung
mechanical performance
Mechanical properties
mechanische Eigenschaften
microstructural evolution
Microstructure
Recrystallization
Steel structures
Tensile strength
Welded joints
Wärmeeintrag
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Summary:Arc welding is a widely applied process in the fabrication of stainless steel structures. Various difficulties may arise in joining of these steels, particularly if high heat input is used. The main aim of this study is to evaluate the influence of heat input on microstructure of the joint region and thus on the mechanical behavior of gas metal arc welded AISI 304 L austenitic plates. To this end, AISI 304 L plates with a thickness of 5 mm were butt‐welded by employing two different heat input values. Detailed microstructural and mechanical characterization were carried out. In addition, the influence of heat input on the microstructure and joint performance values was also determined. The higher heat input resulted in a complete recrystallization at the heat affected zone whereas the base metal microstructure was maintained in the lower heat input joint. Both joints displayed strength matching within the weld region, thus exhibited slightly higher tensile strength than that of the base plate (102 %). The heat input applied to the plates during gas metal arc welding of AISI 304 L steel played a significant role on microstructural evolution in the heat affected zone. While the increase in heat input did not significantly affect the grain size of the dendritic structure evolving in the fusion zone, it led to a complete recrystallization and thus coarser grain structure in the heat affected zone.
ISSN:0933-5137
1521-4052
DOI:10.1002/mawe.202200050