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Shielding gas influences on laser weldability of tailored blanks of advanced automotive steels

  • The effects of shielding gas types and flow rates on CO2 laser weldability of DP600/TRIP700 steel sheets were studied in this work. The evaluated shielding gases were helium (He), argon (Ar) and different mixtures of He and Ar. Weld penetration, tensile strength and formability (Erichsen test) of laser welds were found to be strongly dependent upon the shielding gas types. The ability of shielding gas in removing plasma plume and thus increasing weld penetration is believed to be closely related to ionization potential and atomic weight which determine the period of plasma formation and disappearance. It was found that the higher helium shielding gas flow rate, the deeper weld penetration and the lower weld width.

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Author:Uwe Reisgen, Markus Schleser, Oleg Mokrov, Essam Ahmed
ISSN:0169-4332 (E-Journal); 0169-4332 (Print)
Parent Title (English):Applied surface science
Place of publication:Amsterdam
Document Type:Article
Year of Completion:2010
Date of the Publication (Server):2013/09/10
First Page:1401
Last Page:1406
Institutes:FH Aachen / Fachbereich Maschinenbau und Mechatronik
collections:Verlag / Elsevier