Utjecaj zaštitnog plina i parametara AC MIG zavarivanja dvostrukim pulsom na geometriju zavara

master's thesis

• Title (english): Influence of shielding gas and AC Wave pulse welding parameters on weld geometry
• Author: Matija Hnatek
• Mentor: Zoran Kožuh (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2024-03-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

U teorijskom dijelu rada navedeni su postupci zavarivanja aluminija i aluminijskih legura gdje su detaljnije opisani MIG postupak zavarivanja, AC impulsni MIG i AC Wave impulsni MIG postupak. Detaljno je opisan utjecaj parametara zavarivanja na geometriju zavara a posebice utjecaj EN omjera, frekvencije i jakosti struje zavarivanja. Objašnjeni su problemi koji se javljaju prilikom zavarivanja aluminija i aluminijskih legura, te su navedeni zaštitni plinovi koji se koriste prilikom zavarivanja.
U eksperimentalnom dijelu rada zavareno je šest kutnih spojeva aluminijske legure 5083 AC Wave impulsnim MIG postupkom uz varijacije Wave frekvencije i zaštitnog plina. Usporedbom postignute geometrije zavara utvrđeno je da se zavarivanjem u zaštiti 100% argona postiže veće nadvišenje metala zavara te veća dubina penetracije, dok se zavarivanjem u zaštiti argona s 50% helija postiže općenito veća površina metala zavara kao i veća površina penetracije. Također je utvrđeno da se povećanjem Wave frekvencije povećava nadvišenje, visina, širina, penetracija, površina zavara i površina penetracije metala zavara.

Abstract (english)

In the theoretical part of the thesis, the welding procedures of aluminum and aluminum alloys are listed, where the MIG welding procedure, AC pulse MIG and AC Wave pulse MIG processes are described in more detail. The influence of the welding parameters on the welding geometry are described in detail with emphasis on the EN ratio, frequency and welding current. The problems that arise when welding aluminum and aluminum alloys are explained, and the shielding gases used during welding are listed.
In the experimental part of the work, six fillet welds of aluminum alloy 5083 were welded by AC Wave pulsed MIG process with variations of Wave frequency and shielding gas. By comparing the achieved weld geometry, it was determined that welding with 100% argon as a shielding gas achieves a greater reinforcement height of the weld and greater penetration depth, while welding with argon/helium shielding gas mixture generally results in greater weld area and greater penetration area. It was also found that increasing the Wave frequency increases the reinforcement height, weld width, height, penetration, weld area and area of weld penetration.

• Keywords: Aluminij; MIG; AC Wave impulsni MIG postupak; geometrija zavara; problematika zavarivanja; zaštitni plin
• Keywords (english): Aluminum; MIG; AC Wave pulse MIG process; weld geometry; welding issues; shielding gas
• Language: croatian
• URN:NBN: urn:nbn:hr:235:627315
• 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: 2024-03-26 06:56:01