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On the influence of metal cored wire deposition on the hybrid welding process
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
2007 (English)In: Congress proceedings: 2007 ICALEO, 26th International Congress on Applications of Lasers & Electro-Optics : October 29 - November 1, 2007 / [ed] Yongfeng Lu, Orlando, Fla: Laser institute of America , 2007Conference paper (Refereed)
Abstract [en]

Metal cored wires are often used in gas metal arc welding to increase productivity. Cored wires can, however, also easily be designed to affect weld metal composition or arc characteristics. Specially formulated metal cored wires, designed for laser hybrid welding, could therefore potentially be used to improve the arc and weld pool characteristics and enhance the process flexibility, robustness and productivity. The range of process parameters available in hybrid welding could thereby be extended and the process stability improved further for standard parameters. Small additions of certain elements in the wire can influence the arc plasma state and the surface tension, resulting in an altered arc and weld pool behaviour. A number of metal cored wires have therefore been produced containing additions of several different arc stabilising elements, varied from 0-10% of the powder filling. High speed filming of the welding process with synchronised arc current and voltage measurements was conducted enabling e.g. to detect short short-circuiting. Preliminary results indicate differences in process stability, arc length, surface appearance and penetration profiles between the wires in pulsed mode transfer. The experimental results are accompanied by a theoretical discussion of the phenomena observed, including the use of the Saha equation to calculate electron number density as a function of temperature for relevant chemical elements.

Place, publisher, year, edition, pages
Orlando, Fla: Laser institute of America , 2007.
Research subject
Manufacturing Systems Engineering
URN: urn:nbn:se:ltu:diva-37285Local ID: b436ec50-96a9-11dc-ad7f-000ea68e967bISBN: 978-0-912035-88-8 (electronic)OAI: diva2:1010783
International Congress on Applications of Lasers & Electro-Optics : 29/10/2007 - 01/11/2007
Godkänd; 2007; 20071119 (cira)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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