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Weldability of superalloys Hastelloy X by Yb : YAG laser

Graneix, Jérémie and Béguin, Jean-Denis and Alexis, Joël and Masri, Talal Weldability of superalloys Hastelloy X by Yb : YAG laser. (2015) In: International Symposium on Aircraft Materials ACMA 2014, 23 April 2014 - 26 April 2014 (Marrakech, Morocco).

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Official URL: http://dx.doi.org/10.4028/www.scientific.net/AMR.1099.61

Abstract

Requirements of aircraft parts welded becoming increasingly severe especially in terms of reproducibility of geometry and metallurgical grade of weld bead; laser welding is a viable method of assembly to meet these new demands by its automation to replace longer term the manual TIG welding process. The purpose of this study is to determine the weldability of Hastelloy X alloy by the butt welding process Nd: YAG laser. To identify influential parameters of the welding process (laser power, feed rate, focal diameter and flow of gas) while streamlining testing, an experimental design was established with the CORICO software that uses the graphic correlation method. The position of the focal point was fixed at -1/3 of the thickness of the sheet. The gas flow rate and the power of the beam seem to have a major role on the mechanical properties and geometry of the weld. The strength of the weld is comparable to that of base metal. However, there is a significant drop in the elongation at break of about 30 %. The first observations of the cross section of the weld by scanning electron microscopy coupled with EBSD analysis show generally a molten zone presenting dendritic large grain compared to the equiaxed grains of the base metals without a heat affected zone.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to Trans Tech Publications editor. The definitive version is available at http://www.ttp.net/978-3-03835-424-6/2.html Advanced MaterialsResearch, Trans Tech Publications, 2015, vol. 1099, pp. 61 -70.
HAL Id:hal-01135068
Audience (journal):International peer-reviewed journal
Audience (conference):International conference proceedings
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
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Deposited On:24 Mar 2015 15:52

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