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Hot cracking of Structural Steel during Laser Welding
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2017 (English)In: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 258, 012005Article in journal (Refereed) Published
Abstract [en]

Laser welding is an important technique in many industries due to its high precision in operation, its local and fast processing, narrow welds and its good weld surface quality. However, the process can involve some complications due to the rapid heating and cooling of the material processed, resulting in physical and metallurgical effects as thermal contraction during solidification, giving as a result the presence of residual stresses in the narrow weld. Formation of defects during the process is an important topic to be evaluated in order to achieve better performance of the steels in use. In the present work, defects formed during laser welding of a structural steel have been investigated. The defects formed have been identified and the causes of the defects are discussed. Possible strategies for improvement of the welding procedure and final weld result are proposed. The defects were analysed by optical and scanning electron microscopy and hardness measurement. Cracks were located in the middle of the fusion zone and followed both inter-granular and trans-granular paths. Impurities as manganese sulphides were found along the welding direction, and could act as sites for crack formation. The cracks formed during solidification of the weld are identified as solidification cracks. This kind of cracks is usually caused by solidification shrinkage and thermal contractions during the process, which appear in the fusion zone and sometimes in the heat affected zone.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2017. Vol. 258, 012005
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-66339DOI: 10.1088/1757-899X/258/1/012005Scopus ID: 2-s2.0-85035080802OAI: oai:DiVA.org:ltu-66339DiVA: diva2:1153956
Conference
International Materials Research Meeting in the Greater Region: "Current Trends in the Characterisation of Materials and Surface Modification", Saarland University, Saarbrücken, Germany, 6–7 April 2017
Note

Konferensartikel i tidskrift

Available from: 2017-11-01 Created: 2017-11-01 Last updated: 2017-12-14Bibliographically approved

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CiteExportLink to record
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  • apa
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