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Low-porosity laser welding of 12.7mm thickness aerospace aluminium
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Verhaeghe, Ing G. and Barnes, Stuart (2007) Low-porosity laser welding of 12.7mm thickness aerospace aluminium. In: INALCO 2007, Tokyo, Japan, 24-26 Oct. 2007, Tokyo, Japan, 24-26 Oct 2007. Published in: Proceedings of INALCO 2007
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Official URL: http://www.congre.co.jp/inalco2007/index.html
Abstract
This paper summarises the results of a study aimed at investigating the suitability of a high-power Yb-fibre laser for producing low-porosity welds in a 12.7mm thickness Al-Zn-Mg-Cu aluminium alloy. Full penetration was demonstrated in the 12.7mm material using 7kW of Yb-fibre laser power in both an autogenous set-up and hybrid combination with a MIG arc. Both process configurations were capable of producing a porosity level below that of the stringent weld quality class defined in BS EN 13919-2 and AWS D17.1, by considering shielding gas supply and material surface preparation, and selecting an appropriate laser spot diameter and welding speed. To consistently eliminate keyhole-induced porosity, welding was performed at a speed lower than the maximum capable of full penetration. This welding speed varied with alloy composition, welding process, ie autogenous or hybrid, and laser spot diameter. The occurrence of porosity was also reduced by removing the surface oxide and selecting a larger laser spot diameter (0.6mm instead of 0.4mm). By dry machining top and bottomsurfaces of the samples and the edges to be welded, less than one hour prior to welding, and by the use of a low-moisture shielding gas delivery, the total level of weld metal porosity was reduced to levels acceptable to the weld quality comparators used in this study (BS EN 13919-2 and AWS D17.1).
Item Type: | Conference Item (Paper) | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
Journal or Publication Title: | Proceedings of INALCO 2007 | ||||
Official Date: | 2007 | ||||
Dates: |
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Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Conference Paper Type: | Paper | ||||
Title of Event: | INALCO 2007, Tokyo, Japan, 24-26 Oct. 2007 | ||||
Type of Event: | Conference | ||||
Location of Event: | Tokyo, Japan | ||||
Date(s) of Event: | 24-26 Oct 2007 |
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