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Defect formation in laser welded steels after use of corrosion protection coating
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This bachelor thesis was made in collaboration with Scania. The objective was to find the cause for defects found in some rear axle welds. It was known axle material was coated with anti-corrosive oil.

Oils were examined through ICP-AES, and then compared to the composition found on the surface of the steel samples. Elements found in the oils vastly differed from one another. One of the oils contains large amounts of aluminium while the other contains high levels of calcium. When samples surfaces were analysed using EDS, phases consisting of aluminium and calcium were observed.

These results indicate that the wrong anti-corrosive had been used for the axle material which gave substandard welds. The oil used contained elements with a low vaporisation temperature, such as calcium. This causes instabilities in the keyhole, leading to collapse. Collapse of the keyhole facilitates the formation of defects.

Place, publisher, year, edition, pages
2017.
Keywords [en]
Laser welding, steel, porosity, mid-section bulging, defects, corrosion protection
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:kth:diva-209805OAI: oai:DiVA.org:kth-209805DiVA, id: diva2:1114540
Educational program
Master of Science in Engineering - Materials Design and Engineering
Presentation
2017-05-15, Jernkontoret, 09:02 (English)
Supervisors
Examiners
Available from: 2017-06-28 Created: 2017-06-24 Last updated: 2017-06-28Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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