Plasmakeevituse tehnoloogia uurimine

Raudmäe, Günther; Timofejeva, Jekaterina (2020) Plasmakeevituse tehnoloogia uurimine. [thesis] [en] Research on Plasma Welding Technology.

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Abstract

Lõputöö eesmärgiks oli tundma õppida Eestis vähetuntud plasmakeevitust, milleks kasutati Tallinna Tehnikakõrgkooli plasmakeevitus seadet, mis oli aastaid kasutult seisnud. Lõputöö käigus omandati uusi teadmisi plasmakeevituse valdkonnas ja praktiseeriti neid laboritöödes. Lõputöö teoreetilises osas tutvuti lähemalt plasmakeevituse olemusega, kus pöörati tähelepanu erinevatele tehnoloogiatele, nende jagunemisele ja töötamisele. Uurti ka plasmakeevituse eeliseid ja puudusi, mis olid vajalikud välja selgitamaks, miks võiks antud keevitusliiki tehnika valdkonnas kasutada. Jõuti järeldusele, et plasmakeevituse kõrgete temperatuuride tõttu on võimalik aega ja raha kokkuhoida, sest töö sujub kiiremini ning elektrit kulub vähem. Samuti on keevitatud detailid kvaliteetsemad, sest on väiksema termomõjualaga ja neis tekib vähem deformatsioone. Lõputöö praktilises osas suurimaks ja osaks osutus plasmakeevituse seadme parandamine, millega omandati palju teadmisi masina toimimise ja insenerioskuste kohta. Selgitati välja sobivad keevitusparameetrid, millega oleks optimaalne plasmakeevitust sooritada ja saavutati kvaliteetne keevisõmblus. Leiti sobivad komponendid ja elektroodide kaugused nii pulberpihustuse põleti kui ka kaarleegi põletile, mis olid plasmakeevituse sooritamiseks väga olulise tähtsusega. Lisaks plasmakeevitusele õpiti ka termopressi ja mikrolihvi kasutama, mis olid vajalikud struktuuri uuringuteks. Struktuuri uuringutel vaadati lähemalt eelnevalt sooritatud keevitusi ja analüüsiti, kuidas on terase struktuur keevitamise ajal muutunud. Jõuti järeldusele, et mida ühtlasemad olid struktuurid keevitatud terase erinevates piirkondades, seda kvaliteetsemalt olid keevitused sooritatud.

Abstract [en]

The purpose of the thesis Research on Plasma Welding Technology, was to get to know relatively unknown plasma welding in Estonia, using a Tallinn University of Applied Science welding machine that had been staying unavailing for years. New knowledge in the field of plasma welding was acquired and practised in laboratory work. In the theoretical part of the thesis, a closer look was taken at the nature of plasma welding, where attention was paid to the various technologies, their distributions and operations. The advantages and disadvantages of plasma welding, which were necessary to determine why this type of welding technique could be used, were also examined. It was concluded that, due to the high temperatures of plasma welding, time and money could be saved, as the operation would be faster and less electricity would be consumed. Also, the welded parts are of higher quality because they have a smaller thermal area and result in less deformation. In the practical part of the thesis , the improvement of the plasma welding machine, which gained a lot of knowledge about the operation and engineering skills of the machine, was the greatest and most important part of our thesis. Otherwise, plasma welding could not have been performed, which was the aim of the thesis. Appropriate welding parameters were identified to optimise plasma welding and achieve high quality weld. Suitable components and electrode distances were found for both the powder spray welding torch and the arc flame torch, which were very important for performing the plasma welding. In addition to plasma welding, the use of thermal mounting press and micropolish was also studied, which were necessary for structural studies. In the structure studies, authors of the thesis looked at previously performed welds and analysed how the steel structure changed during welding. It was concluded that the more homogeneous the structures were in the different areas of welded steel, the higher quality the welds were.

Item Type: thesis
Advisor: Toomas Pihl
Subjects: Mechanical Engineering > Production Engineering and Technology > Welding Technology and Equipment
Divisions: Institute of Technology and Circular Economy > Industrial Technology and Marketing
Depositing User: Günther Raudmäe
Date Deposited: 12 Jun 2020 12:12
Last Modified: 12 Jun 2020 12:12
URI: https://eprints.tktk.ee/id/eprint/5576

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