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Advanced quality assurance of welded and adhesively bonded joints
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
2014 (Swedish)Report (Refereed)
Abstract [sv]

Structures and components are often joined steel structures that are heavily subject to fatigue. Common examples of such structures are construction equipment, cranes, bridges, wind towers, trains, ships, vessels, etc. Defects occurring from joining that are hard to identify can cause product failures, this creates enormous demands on the manufacturing process for the probability of detection of defects. To detect defects already in the production with a flexible on-line tool would imply a great competing situation and resource savings. Today quality assurance in production environments is many times performed solely on a few selected areas of the joined structure. Additional destructive evaluation is also commonly used, and in that case around 3-5 cross-sections are randomly selected from a specific part or product, and the geometry is established through macroscopic evaluation and measurements. However, these methods less than 1% of the total joint geometry, and are both time consuming and cost inefficient. Laser induced UltraSonic (LUS) is a contact free ultrasonic technique for non-destructive testing where both generation and detection of the ultrasound is carried out with laser light. The project has evaluated different approaches to measure weld defects that are normally hard to detect including defects in adhesively bonded joints. LUS-measurements were performed on different welded and adhesively bonded structures, with promising results obtained for all evaluated imperfections: - Weld: Internal lack of fusion, cold laps, insufficient penetration - Adhesive: lack of curing, lack of adhesion. Further development of algorithms and analysis is needed to ensure the robustness of the measurement system.

Place, publisher, year, edition, pages
Swerea KIMAB AB , 2014.
Series
Rapport / Institutet för metallforskning, ISSN 1403-848X ; KIMAB-2014-102
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13009OAI: oai:DiVA.org:ri-13009DiVA: diva2:973203
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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