Analiza utjecaja zaštitnog plina na svojstva zavara pri MAG zavarivanju dupleks čelika

master's thesis

• Title (english): Analysis of shielding gas influence on the weld properties at MAG welding of duplex steel
• Author: Petra Kapuđija
• Mentor: Ivica Garašić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-07-20, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

U teorijskom dijelu rada opisani su visokolegirani čelici općenito i podjela, a posebno su objašnjeni dupleks (austenitno-feritni) čelici. Naveden je povijesni razvoj dupleks čelika, mikrostruktura, svojstva te primjena dupleks čelika. Obrađena je i tema zavarljivosti i zavarivanja dupleks čelika. U daljnjem radu opisan je MAG postupak zavarivanja i karakteristični načini prijenosa metala kod istog postupka. Opisani su osnovni parametri MAG zavarivanja, izbor dodatnih materijala, izvori struje za zavarivanje, sustav i uređaji za dodavanje žice, sustav za upravljanje protoka zaštitnog plina i pištolj za MIG/MAG zavarivanje. U posljednjem poglavlju teorijskog dijela opisani su zaštitni plinovi, njihova svojstva, podjele te karakteristični plinovi kod MAG zavarivanja.
Cilj eksperimentalnog dijela bio je provesti ispitivanje utjecaja različitih plinskih mješavina uz MAG zavarivanje na osnovnom materijalu dupleks čelika. Opisan je osnovni i dodatni materijal, korištena oprema za zavarivanje. Nadalje, opisano je zavarivanje ispitnih uzoraka, izrada makroizbrusaka te rezultati i analiza makrostrukture. Na kraju rada analizirani su rezultati dobivenih rezultata.

Abstract (english)

In the theoretical part of the thesis are described the high-alloy steels in general and their division, and duplex (austenitic-ferritic) steels. The historical development of duplex steel, microstructure, properties and application of duplex steel are listed. The subject of weldability and welding of duplex steel is also covered. In the following, it contains also, the MAG welding process and the characteristic ways of metal transfer during the same process. The basic parameters of MAG welding, the choice of additional materials, sources of welding power, the system and devices for adding wire, the system for controlling the flow of shielding gas and the gun for MIG/MAG welding are described. The last chapter contains the theoretical part the subject shielding gases, their properties, divisions and characteristic gases in MAG welding.
The goal of the experimental part was to test the influence of different gas mixtures with MAG welding on the basic material of duplex steel. Basic and additional material, used welding equipment are described. Furthermore, the welding of test samples, the production of macrosamples, and the results and analysis of the macrostructure are described. The end of the thesis contains the results and analysis of the obtained samples.

• Keywords: MAG zavarivanje; dupleks; zaštitni plinovi
• Keywords (english): MAG welding; duplex; shielding gas mixtur
• Language: croatian
• URN:NBN: urn:nbn:hr:235:783205
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering, Mechatronics and Robotics, Autonomous Systems; Course: Production 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: 2023-07-18 12:31:31