Analiza zaostalih naprezanja pri zavarivanju MCAW postupkom u zaštiti mješavine Ar-CO2-O2

master's thesis

• Title (english): Analysis of residual stress during MCAW welding process in shielding of Ar-CO2-O2 mixture
• Author: Borna Borevković
• Mentor: Ivica Garašić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-12-07, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

U ovom diplomskom radu analizirana je raspodjela zaostalih naprezanja izmjerenih metodom rendgenske difrakcije u različitim konfiguracijama zavarenog spoja. Raspodjela zaostalih naprezanja nakon zavarivanja mjerena je u uzorcima kutnog i sučeljenog zavarenog spoja od čelika S355. Uzorci su zavareni MAG postupkom uz korištenje žice punjene metalnim praškom.

U teorijskom dijelu opisan je princip rada i uspoređeni su postupci MIG/MAG i MCAW zavarivanja. Objašnjena su zaostala naprezanja, vrste i način nastanka te metode smanjenja zaostalih naprezanja prije, tijekom i nakon zavarivanja. Pojašnjene su i različite metode mjerenja zaostalih naprezanja s naglaskom na metodi mjerenja rendgenskom difrakcijom korištenjem cos α metode.

U eksperimentalnom dijelu cilj je bio analizirati raspodjelu zaostalih naprezanja nastalu nakon zavarivanja MCAW postupkom. Opisana je priprema i parametri zavarivanja te postupak mjerenja zaostalih naprezanja. U zaključku rada analizirani su dobiveni rezultati.

Abstract (english)

In this thesis, the distribution of residual stresses was analyzed and measured by a method of X-ray diffraction in different types of welding joints. The distribution of residual stresses was measured after welding using the MCAW process. One fillet and one butt weld joint sample were welded, each made out of S355 steel.

In the theoretical part, the working principles of MIG/MAG and MCAW welding processes are explained and compared. Mechanisms for the formation of different types of residual stresses are described. Methods that can be used to minimize residual stress before, during, and after welding are also described. The methods of measuring residual stresses are described, with an emphasis on an X-ray diffraction measurement technique called cos α.

In the experimental part, the goal was to analyze the distribution of residual stresses created after MCAW welding. The preparation and welding parameters are described, as well as the residual stress measurement procedure. At the conclusion of the work, the obtained results were analyzed.

• Keywords: zavarivanje; MAG; MCAW; zaostala naprezanja; rendgenska difrakcija
• Keywords (english): welding; MAG; MCAW; X-ray diffraction; residual stresses
• Language: croatian
• URN:NBN: urn:nbn:hr:235:988077
• 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: 2023-11-30 11:08:58