Analiza zaostalih naprezanja pri zavarivanju čelika S355J2+N MCAW postupkom u zaštiti plina C6X1 i C12X2

master's thesis

• Title (english): Analysis of residual stress during welding of S355J2+N steel with MCAW process using C6X1 and C12X2 shielding gases
• Author: Tomislav Novina
• Mentor: Ivica Garašić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2024-12-05, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

Ovaj diplomski rad opisuje analizu zaostalih naprezanja kod zavarivanja konstrukcijskog čelika S355J2+N metalnim prahom punjenom žicom. Pomoću metode rendgenske difrakcije izmjerena su zaostala naprezanja na T-zavarenim spojevima.

U teorijskom dijelu opisan je MIG/MAG i MCAW postupak zavarivanja i njihova usporedba. Navedeni su i objašnjeni zaštitni plinovi korišteni u navedenim postupcima i njihove mješavine. Zatim je razrađena tema zaostalih naprezanja u zavarenom spoju i metode mjerenja zaostalih naprezanja rendgenskom difrakcijom od kojih je izdvojena cos α metoda.

U eksperimentalnom dijelu provedena je analiza rezultata zaostalih naprezanja mjerenih rendgenskom difrakcijom na uzorcima zavarenim MCAW postupkom uz zaštitnu atmosferu Ar-CO2-O2 plinskih mješavina. Također provedena je makroanaliza i određen stupanj miješanja, te je određen utjecaj unosa topline i vrste zaštitne plinske mješavine na zaostala naprezanja.

Abstract (english)

This master thesis describes the analysis of residual stresses during welding of structural steel S355J2+N with metal cored arc wire. Residual stresses on T configurations of welded joints were measured using X-ray diffraction.

The theoretical part describes the MIG/MAG and MCAW welding process and their comparison. The shielding gases used in the mentioned procedures and their mixtures are listed and explained. Then the subject of residual stresses in the welded joint and methods of measuring residual stresses by X-ray diffraction were elaborated, of which the cos α method was individually explained.

In the experimental part, the analysis of the results of residual stresses measured by X-ray diffraction on samples welded by the MCAW process with shielding gas mixture of Ar-CO2-O2. A macro analysis was also performed, and the degree of mixing was determined, as was the influence of heat input and the type of shielding gas mixture on residual stresses.

• Keywords: zavarivanje; rendgenska difrakcija; MIG/MAG; MCAW; cos α metoda; Ar-CO2-O2 plinske mješavine
• Keywords (english): welding; X-ray diffraction; MIG/MAG; MCAW; cos α method; Ar-CO2-O2 gas mixture
• Language: croatian
• URN:NBN: urn:nbn:hr:235:310307
• 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, Mechanics and Robotics, Autonomous Systems, Mechatronics and Robotics; Course: Production Engineering; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva (sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-11-28 12:21:46