Primjena mješavine Ar-He pri zavarivanju čelika P91

master's thesis

• Title (english): Application of Ar-He shielding gas mixture for welding of P91 steel
• Author: Kristijan Jurgec
• Mentor: Ivica Garašić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2019-07-11, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

U teoretskom dijelu rada opisani su čelici koji su za vrijeme rada izloženi visokim temperaturama te je napravljen pregled promjena koje se događaju kod ovih čelika zbog njihovih specifičnih uvjeta rada. Detaljnije su opisane karakteristike martenzitnog čelika P91 koji se koristi u izgradnji i reparaturi termoenergetskih postrojenja. Istaknuta je problematika zavarljivosti i promjena mikrostrukture u području zavarenog spoja. Prikazane su tehnologije koje se koriste za zavarivanje čelika P91, a detaljnije je analiziran TIG postupak zavarivanja.
U eksperimentalnom dijelu izrađeni su ispitni uzorci za određivanje svojstava zavarenog spoja. Određeni su parametri procesa i provedeno je zavarivanje cijevi od čelika P91 upotrebom TIG postupka zavarivanja. Na temelju rezultata ispitivanja doneseni su zaključci o prikladnosti korištenja odabranih parametara zavarivanja i primjeni korištene zaštitne plinske mješavine kod zavarivanja čelika P91.

Abstract (english)

The theoretical part of the thesis describes steels that are exposed to high temperatures during operation and overview of the changes that occur in these steels due to their specific operating conditions is made. The characteristics of martensitic steel P91 that is used in the construction and repair of thermal power plants are described in more detail. The problem of weldability and changes in the microstructure in the weld joint area is highlighted. The technologies used for welding P91 steel are shown and the TIG welding process is analyzed in more detail.
In the experimental part, samples were tested for determining the properties of the welded joint. Process parameters were defined and pipes made of P91 steel were welded using TIG welding procedure. Based on the test results, conclusions on the suitability of using the selected welding parameters and the application of the used protective gas mixture for welding P91 steel were made.

• Keywords: čelik P91; puzanje materijala; TIG zavarivanje
• Keywords (english): P91 steel; creep of material; TIG welding
• Language: croatian
• URN:NBN: urn:nbn:hr:235:357912
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-07-04 10:33:27