Utjecaj parametara na geometriju spoja kod AC MIG zavarivanja aluminija

undergraduate thesis

• Title (english): Influence of the parameters on weld profile at AC MIG welding of aluminium
• Author: Dominik Toma
• Mentor: Ivica Garašić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-03-02, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

U ovom radu obrađen je postupak AC MIG i njegove prednosti u odnosu na konvencionalni
MIG. Detaljno je objašnjena problematika izmjenične struje, njene prednosti i upotreba u
MIG/MAG zavarivanju. Prikazan je i utjecaj polariteta struje na MIG postupak. Objašnjen je
utjecaj balansa i frekvencije izmjenične struje na geometriju zavara. Također su objašnjeni
problemi kod zavarivanja aluminija te koje je sve probleme moguće riješiti postupkom AC MIG
u zavarivanju aluminija tanjih debljina.
U eksperimentalnom dijelu rada provedeno je automatizirano AC i DC impulsno MIG
navarivanje 6 uzoraka aluminijske legure 5083. Nakon navarivanja provedena je analiza
deformacija u ovisnosti o vrsti struje i značajkama izmjenične struje tj. frekvencije i balansa
polariteta. Izrađeni su makroizbrusci na kojima je ispitivana ovisnost geometrije zavara o
značajkama izmjenične struje. Na temelju rezultata provedena je analiza te je pokazana ovisnost
geometrije i deformacija zavara o značajkama izmjenične struje, te je uspoređen AC i DC MIG
postupak te je pokazano da AC daje bolje rezultate, bolju kontrolu procesa i manje deformacije
kod zavarivanja aluminija.

Abstract (english)

The subject of this paper is the AC MIG process and its advantages over conventional MIG.
The problem of alternating current, its advantages and use in MIG/MAG welding are explained
in detail. The influence of current polarity on the MIG procedure is also presented. It also
explains the influence of balance and frequency of alternating current on weld geometry.
Problems in aluminium welding are also described and what problems can AC MIG solve in
welding thinner aluminium.
In the experimental part of the work, automated AC and DC pulse MIG welding of 6 samples
of aluminum alloy 5083 was performed. After welding, deformation analysis was carried out
to determine the dependence of deformations on current type and characteristics of alternating
current, EN ratio and frequency. Macrographs were made to determine the dependence of the
weld geometry on the characteristics of alternating current. Based on the results, the analysis
was performed and the dependence of the geometry and deformation of welds on the
characteristics of alternating current was shown, and the AC and DC MIG procedure were
compared and it was shown that AC gives better results, better process control and less
deformation in aluminium welding.

• Keywords: AC MIG; aluminij; frekvencija; balans
• Keywords (english): AC MIG; aluminium; frequency; EN ratio
• Language: croatian
• URN:NBN: urn:nbn:hr:235:792290
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-02-28 20:17:05