Usporedba konvencionalnog pulsnog i AC MIG zavarivanja aluminijske legure 5083 uz primjenu Ar-He mješavine

master's thesis

• Title (english): Comparison of conventional pulse and AC MIG welding of aluminium alloy 5083 with application of Ar-He mixture
• Author: Kristijan Nemec
• 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

Diplomski rad sastoji se od teorijskog i eksperimentalnog dijela. U teorijskom dijelu objašnjena
je problematika zavarivanja aluminijskih legura te su navedeni postupci kojima je moguće
zavariti aluminijske legure. Pobliže su objašnjena dva postupka, MIG – P i AC MIG
zavarivanje. Uz postupke zavarivanja, objašnjena je uloga zaštitnih plinova u procesu
zavarivanja. Uspoređene su razlike između dva plina koja se koriste za zavarivanje aluminijskih
legura, argona i helija.
U eksperimentalnom dijelu rada napravljena je usporedba između MIG – P i AC MIG postupka
zavarivanja te usporedba između zaštitnog plina argona i zaštitne smjese argon + helij.
Usporedba je napravljena analizom površine zavara te profila zavara. Na temelju analize
uzoraka, dokazano je kako se AC MIG postupak postavlja kao bolji izbor za zavarivanje
aluminijskih legura zbog svoje penetracije, povećane brzine i smanjenog unosa topline. Osim
toga, analizom utjecaja zaštitnih plinova dokazano je da se dodatkom helija može utjecati na
povećanje penetracije u osnovni materijal te se može utjecati na oblik profila zavara koji
poprima zaobljeni oblik.

Abstract (english)

This master’s thesis consists of theoretical and experimental part. The theoretical part explains
the issues related to welding aluminum alloys and describes different welding procedures used
for welding aluminum alloys. Two welding processes, MIG – P and AC MIG, are explained in
detail. Along with the welding procedures, the role of shielding gases in the welding process is
also explained. The differences between the two gases used for welding aluminum alloys, argon
and helium, are explained.
In the experimental part of the thesis, a comparison is made between the MIG – P and AC MIG
welding procedures, as well as between the shielding gas argon and shielding gas mixture of
argon and helium. The comparison was made through an analysis of the weld surface and weld
profile. Sample analysis has proven that the AC MIG process is superior for welding aluminum
alloys due to its penetration, increased speed, and reduced heat input. Furthermore, the analysis
of the influence of shielding gases has shown that the addition of helium can impact the
increased penetration into the base material and affect the shape of the weld profile, giving it a
rounded form.

• Keywords: MIG - P; AC MIG; aluminijske legure; argon; helij
• Keywords (english): MIG - P; AC MIG; aluminium alloys; argon; helium
• Language: croatian
• URN:NBN: urn:nbn:hr:235:785015
• 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: 2023-07-11 07:10:31