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Development of an algorithm for quality inspection of welded structures
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures. (KTH Weld Mechanics Group)ORCID iD: 0000-0003-4465-9299
Volvo Construct Equipment Struct & Durabil Europe, Stockholm, Sweden.ORCID iD: 0000-0002-2847-1555
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures. (KTH Weld Mechanics Group)ORCID iD: 0000-0003-4180-4710
2012 (English)In: Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture, ISSN 0954-4054, E-ISSN 2041-2975, Vol. 226, no 6, 1033-1041 p.Article in journal, Editorial material (Refereed) Published
Abstract [en]

A selection of reliable measurement systems that are able to measure the toe radius along the weld bead in a T-jointhas been studied. The results show that the currently used methods and gauges do not provide the required accuracywhen measuring the toe radius. The gauges are handled differently by different operators – even when using a vision system– which makes the current evaluation methods subjective and unreliable.Therefore, an algorithm has been developed that assesses weld bead surface data and automatically identifies and calculatesthe toe radius and the toe angle along the weld. The results obtained by the algorithm are consistent with referencemeasurements and it is possible for the algorithm to be used in improving the process and quality control duringwelding.

Place, publisher, year, edition, pages
Sage Publications, 2012. Vol. 226, no 6, 1033-1041 p.
Keyword [en]
Welded joints, imperfections, quality, surface measurements, inspection
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Vehicle and Maritime Engineering; Solid Mechanics; Mathematics; Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-188216DOI: 10.1177/0954405412439138ISI: 000305483000007ScopusID: 2-s2.0-84871941353OAI: oai:DiVA.org:kth-188216DiVA: diva2:934555
Projects
WIQLIGHTSTRUCT
Funder
VINNOVA, 2009-04719
Note

QC 20160609

Available from: 2016-06-09 Created: 2016-06-09 Last updated: 2016-06-13Bibliographically approved
In thesis
1. Fatigue properties of cut and welded high strength steels: Quality aspects in design and production
Open this publication in new window or tab >>Fatigue properties of cut and welded high strength steels: Quality aspects in design and production
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This doctoral thesis concerns fatigue of welded structures. Welding is one of the world’s most common joining methods and it is frequently used in several structural applications in many fields. Some examples are construction vehicles, loader cranes, trucks, busses, forestry and agricultural machines, bridges and ships. Since these structures are subjected to repeated loading, fatigue is the most common cause of failure.

A novel numerical algorithm has been developed which assesses the welded surface and calculates and quantifies weld quality parameters and the presence of defects which are critical in fatigue applications. The algorithm is designed for implementation in serial production. It will provide robust and reliable feedback on the quality being produced, which is essential if high strength steels are utilized.

Two welding procedures which can increase the weld quality in as welded conditions have been assessed. These procedures utilize welding in different positions and pendling techniques, which can be accomplished using the existing welding equipment. It was found that by using these methods, the fatigue strength can be increased compared to normal weld quality.

Furthermore, two fatigue assessment methods ability to account for increased weld quality in low cycle and high cycle fatigue applications has been studied. One of these methods showed sufficient accuracy in predicting the fatigue strength with small scatter and also account for increased weld quality.

When implementing thinner high strength steels, the overall stress level in the structure increase. Therefore, other locations such as the steel cut edges may become critical for fatigue failure unless they are not designed and manufactured with the same quality as the welded joint. The influence of surface quality on cut edges was studied and the fatigue strength was estimated using international standards and a fatigue strength model for cut edges.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 56 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2016:21
Keyword
Welding, Fatigue assessment, Cutting, Weld quality, Fatigue design, Fracture Mechanics
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-188225 (URN)978-91-7729-027-8 (ISBN)
Public defence
2016-08-26, F3, Lindstedtsvägen 26, Stockholm, 09:00 (English)
Opponent
Supervisors
Projects
WIQLIGHTSTRUCTONWELD
Funder
VINNOVA
Note

QC 20160613

Available from: 2016-06-13 Created: 2016-06-09 Last updated: 2016-06-13Bibliographically approved

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Stenberg, ThomasLindgren, EricBarsoum, Zuheir
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Lightweight Structures
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Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture
Production Engineering, Human Work Science and Ergonomics

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