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Undersökning av svetsegenskaper för svetsning med rörtråd kontra homogen tråd
Karlstad University, Faculty of Technology and Science, Department of Mechanical and Materials Engineering.
2013 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
An examination of weld properties for welding with tube electrode vs. homogenous electrode (English)
Abstract [en]

Welding is a common method for joining of metal or plastic construction parts. This report describes several different weld methods in general terms. The report focuses on the GMAW method, specifically MAG welding.

A case study has also been performed for the company Wenmec. The task received from the company was to compare the mechanical properties of joints welded with the tube electrode called Nittetsu SM-3A and joints welded with the homogenous electrode called ESAB Aristorod 12.63. Both types of weld joint were welded with the MAG method with an Argon based shielding gas with 18% CO2. The final task of this study is to compare the cost of these electrodes and then help Wenmec to decide which electrode that is the most cost effective.

Tensile testing, impact testing and fatigue testing were performed on the weld joint samples. The hardnesses, microstructures, failure zones and chemical composition were examined with optical microscopy and SEM.

The weld time, the amount of consumed electrode and the weld energy was measured during welding. These properties were similar and the differences between the different joints could be ignored.

Both weld joint types showed similar microstructures and hardnesses. The microstructure was ferrite with carbides or perlite at the grain boundaries. Some silicon oxides were found in the grains.

The yield strength, ultimate tensile strength and cycles to fatigue failure were similar in the two joint types, but the Aristorod weld joint showed higher impact strength and elongation at break.

The chemical composition showed that the SM-3A electrode was a metal cored electrode with some additions of deoxidizing elements and a Copper coating. The Aristorod 12.63 electrode also showed the presence of deoxidizing elements and likely had a Titanium based coating. The sheet metal used as the work pieces are called Ruukki Laser 355 MC and is steel with low Carbon content, some Manganese and some impurities.

The SM-3A electrode was costlier than the 12.63 electrode. This work concluded that the 12.63 electrode was a better alternative for Wenmec due to the lower cost, higher impact strength and higher elongation at break

Abstract [sv]

Svetsning är en vanlig metod för att sammanfoga detaljer av metall och i vissa fall plast. Denna rapport beskriver flera olika svetsmetoder och allmänna fakta kring dem varpå rapporten fördjupas inom GMAW metoden, specifikt MAG.

Ett detaljfall studeras också då företaget Wenmec gett uppdraget att jämföra mekaniska egenskaper för svetsfogar svetsade med rörelektroden Nittetsu SM-3A respektive den homogena elektroden ESAB Aristorod 12.63. Båda fogtyperna svetsades med MAG metoden och en argonbaserad skyddsgas med 18 % CO2. Till sist berör detta arbete de svetsekonomiska aspekterna för Wenmec och om företaget bör byta elektrodtyp eller inte.

Mekanisk provning som utförts var dragprovning, slagprovning och utmattningsprovning. Mikrostrukturen och hårdheten i svetsfogarna jämfördes samt brottytor och kemisk sammansättning undersöktes med SEM.

Vid svetsning jämfördes svetstid och materialåtgång samt den så kallade sträckenergin. Svetstekniskt var de båda svetsfogarna så lika att skillnader kunde ignoreras.

Det visade sig att de båda elektroderna gav upphov till svetsgods med likadan mikrostruktur och snarlik hårdhet. Mikrostrukturen visade sig vara ferritisk med vissa mängder karbid eller perlit vid korngränserna. Partiklar i mikrostrukturen visade sig vara främst kiseloxider.

Cykler till utmattningsbrott, sträckgräns och brottgräns var snarlika mellan de båda svetsfogarna medan Aristorod 12.63 hade bättre brottöjning och slagseghet.

Den kemiska analysen visade att SM-3A var en metallpulverfylld rörelektrod med vissa deoxiderande tillsatser och en ytbeläggning som bestod av koppar. Aristorod 12.63 hade också vissa deoxiderande tillsatser och hade troligen en titanhaltig ytbeläggning. Stålplåten som användes som arbetsstycke var Ruukki Laser 355 MC och är ett lågkolstål med en aning mangan och andra föroreningar.

De ekonomiska aspekterna visar att SM-3A är ett dyrare alternativ än 12.63. Sammantaget kom detta arbete fram till att SM-3A inte är ett attraktivt alternativ för Wenmec då slagseghet och brottöjning var sämre och elektroden dessutom var dyrare.

Place, publisher, year, edition, pages
2013. , 66 p.
Keyword [en]
welding, microstructure, fatigue, tensile testing, impact testing, MIG/MAG
Keyword [sv]
svetsteknik, mikrostruktur, utmattning, dragprov, slagprov, MIG/MAG
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kau:diva-16354Local ID: MT:1OAI: oai:DiVA.org:kau-16354DiVA: diva2:586554
External cooperation
Wenmec AB
Subject / course
Mechanical Engineering
Uppsok
Technology
Supervisors
Examiners
Available from: 2013-01-23 Created: 2013-01-11 Last updated: 2013-01-23Bibliographically approved

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