Apr 6, 2020   2:43 p.m. Irena
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prof. Ing. Pavol Sejč, PhD.
Identification number: 2300
University e-mail: pavol.sejc [at] stuba.sk
 
Profesor CSc.,PhD. - Institute of technologies and materials (FME)
 
External colleague - Institute of Production Technologies (MTF)

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Basic information

Basic information about a final thesis

Type of thesis: Dissertation thesis
Thesis title:Technological and Metalurgical Aspects of Arc-Brazing of Austenitic Steel 304L
Written by (author): Ing. Rastislav Kubíček, PhD.
Department: Institute of technologies and materials (FME)
Thesis supervisor: prof. Ing. Pavol Sejč, PhD.
Opponent 1:doc. Ing. Štefan Emmer, PhD.
Opponent 2:prof. Ing. Roman Koleňák, PhD.
Final thesis progress:Final thesis was successfully defended.


Additional information

Additional information about the final thesis follows. Click on the language link to display the information in the desired language.

Language of final thesis:Slovak

Slovak        English

Title of the thesis:Technological and Metalurgical Aspects of Arc-Brazing of Austenitic Steel 304L
Summary:When welding thin austenitic stainless steel plates, common technical practice mostly employs conventional fusion arc welding processes. This case also occurs within an energy industry, where an Air Heat Exchangers are often being designed of thin 304L austenitic steel of thickness up to 2 mm. At the welding of austenitic stainless steel using fusion welding process, fabricators have to face various technological and metalurgical weldability issues, which are mostly related to melting and consecutive crystalization (e.g. hot cracking), or excessive amount of thermal energy input (residual deformation resulting from welding process). Since an Arc-Brazing process provides a non-fusion mechanism of joining and also enables processing at relatively low heat impact to material, above mentioned attributes have given an impulse to its research and to analyse its utilization possibilities for joining 304L within this PhD Thesis. The aim was to substitute currently used fusion processes for arc-brazing and to eliminate mentioned weldability issues as a result. Proposed metodology of PhD Thesis reflects on qualitative and application requirements, which have been specified as conditions of Arc-Brazing application intended for joints of Air Heat Exchangers, or alternative units. The aim of experimental part was to propose technological parameters and conditions of Arc-Brazing process providing production of joints to be in compliance with mentioned requirements. Technological and metalurgical aspects of process have been analysed and consequently exact technological outputs have been defined in order of direct application of process into the fabrication.
Key words:Arc-Brazing, Arc metal transfer, Steel 304L

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