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Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.Powell, John Kaplan, Alexander 2010 (English)In: Congress proceedings ICALEO: 29th International Congress on Applications of Lasers & Electro-Optics : September 26 - 30, 2010, Anaheim, CA, USA, Anaheim Marriot ; [including] Laser Materials Processing Conference, Laser Microprocessing Conference, Nanomanufacturing Conference / [ed] Xinbing Liu, Anaheim, CA: Laser institute of America , 2010, 172-178 p.Conference paper, Published paper (Other academic)

Abstract [en] : With the help of high speed camera equipment, researchers can now directly observe melt flow phenomena which only could be imagined or simulated in the past. In this paper the motion of the molten metal inside the keyhole has been observed at frame rates as high as 180000 fps to provide useful information about the laser beam welding process. This paper describes two different cases where high speed imaging has given new insights into the laser beam welding process: A. In pulsed welding the melt pool oscillations can create ripples on the solidified weld surface. With the help of a high speed camera this phenomenon was analyzed, and the pulse shape was adjusted to reduce the ripple amplitude to a minimum. B. In Zn-coated steel edge welding it could be seen that blowouts were sometimes created in the melt pool at some distance behind the keyhole. Direct slowmotion observation has led to the formulation of a phenomenological model of this effect.

Place, publisher, year, edition, pages: Anaheim, CA: Laser institute of America , 2010. 172-178 p.

Keyword [en] : Engineering mechanics - Mechanical manufacturing

Keyword [sv] : Teknisk mekanik - Mekanisk tillverkningsteknik

Research subject: Manufacturing Systems Engineering

Identifiers: URN: urn:nbn:se:ltu:diva-35335Scopus ID: 78650332141Local ID: 9d629b80-e658-11df-8b36-000ea68e967bISBN: 9780912035611 (electronic)OAI: oai:DiVA.org:ltu-35335DiVA: diva2:1008588

Conference: International Congress on Applications of Lasers & Electro-Optics : 26/09/2010 - 30/09/2010

Note: Godkänd; 2010; 20101102 (ingeri)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved



Author: Eriksson, Ingemar

Source: http://ltu.diva-portal.org/







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