Stabilnost procesa mag zavarivanja s trokomponentnim plinskim mješavinama

undergraduate thesis

• Title (english): Process stability of mag welding with three component gas mixtures
• Author: Stjepan Štavalj
• Mentor: Zoran Kožuh (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2017-03-03, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U teorijskom dijelu ovog završnog rada opisan je MAG postupak elektrolučnog zavarivanja s posebnim naglaskom na načine prijenosa metala u električnom luku, zatim je opisan CBT – Controlled bridge transfer, modificirani način prijenosa metala u električnom luku, prednosti i primjena. Zadnji dio teorijskog dijela rada odnosi se na zaštitne plinove i trokomponentne plinske mješavine argona, ugljičnog dioksida i kisika koje se koriste pri MAG zavarivanju. Opisane su karakteristike i utjecaj plinova na ponašanje električnog luka i svojstva zavara.

U eksperimentalnom dijelu ovog rada opisana je oprema pomoću koje je proveden eksperiment, dodatni materijal i zaštitne plinske mješavine korištene u eksperimentu. U eksperimentu su uspoređene karakteristike električnog luka u konvencionalnom i CBT prijenosu metala u zaštiti trokomponentnih plinskih mješavina sastava 90% Ar, 5% O2 i 5% CO2 te 93% Ar, 1% O2 i 6% CO2 na više razina unosa topline. Dobiveni su rezultati analizirani, uz poseban osvrt na pogodnost zadanih plinskih mješavina za korištenje pri CBT prijenosu metala.

Abstract (english)

In the theoretical part of this paper MAG welding process is presented with the special emphasis on the metal transfer in the arc. Also, CBT is described – Controlled Bridge transfer, a modified method of metal transmission in an electric arc; advantages and application. Last paragraph of the theoretical part refers to shielding gasses and three-component gas mixtures of Argon, Carbon Dioxide and Oxygen used in MAG welding. Properties of gases are described as well as their impact on the electric arc behavior and weld properties.

Equipment, additional materials and shielding gases mixtures are described in the experimental part of this paper. In the experiment arc properties in the conventional and CBT metal transfer were compared using three – component gas mixtures with the composition of 90% Ar, 5% O2 and 5% CO2, also 93% Ar, 1% O2 and 6% CO2 on different heat input levels. Obtained results were analyzed, especially referring to suitability of used gas mixtures for CBT metal transfer.

• Keywords: MAG zavarivanje; CBT; trokomponentne plinske mješavine
• Keywords (english): MAG welding; CBT; three-component gas mixture
• Language: croatian
• URN:NBN: urn:nbn:hr:235:560035
• 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: 2019-05-22 18:54:09