Monitoring undercut, blowouts and root sagging during laser beam welding
2009 (English)In: Lasers in Manufacturing 2009: proceedings of the Fifth International WLT-Conference Lasers in Manufacturing, LIM 2009 : Munich, Germany, June 15th - 18th, 2009 / [ed] Andreas Ostendorf, Stuttgart: Gabler Verlag/GWV Fachverlage GmbH, 2009Conference paper (Refereed)
Using a 14 kW CO2-laser, 12mm thick cold-formed steel S420MC has been welded to a machined shaft pivot made of 25CrMo4 steel as part of a truck rear axel. A photodiode-based, on-line process monitoring system has been applied for detecting defects. However, the occurrence of certain defects, namely undercut, blowouts and root sagging is often not detectable from the sensor signal. The time dependent signal is collected from emissions from the melt pool surface as well as from the plasma plume. Based on the evaluation of high speed images, an explanation of the potential and limitations of detection of these defects has been generated. Although preliminary conclusions have been drawn, uncertainties regarding emissivity and the keyhole and plasma radiation characteristics require further studies.
Place, publisher, year, edition, pages
Stuttgart: Gabler Verlag/GWV Fachverlage GmbH, 2009.
Materials science - Other processing/assembly
Teknisk materialvetenskap - Övrig bearbetning/sammanfogning
Research subject Manufacturing Systems Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-37929Local ID: c1f3cd50-a1fa-11de-8293-000ea68e967bOAI: oai:DiVA.org:ltu-37929DiVA: diva2:1011428
WLT Conference on Lasers in Manufacturing : 15/06/2009 - 18/06/2009
Godkänd; 2009; 20090915 (petern)2016-10-032016-10-03Bibliographically approved