Affiliation:
1. TWI
2. Corus RD&T
3. University of Manchester and UMIST
Abstract
Fusion welding of 7xxx aluminium alloy plates has been investigated for aerospace applications using autogenous laser welding and hybrid laser-MIG welding. Nd:YAG and Yb-fibre lasers have been used, with two different focussed spot sizes in each case. Autogenous and hybrid welding of 12.7mm thick plate using the Yb-fibre laser with a 0.6mm diameter spot was selected for further development, on the basis of penetration and weld quality achieved. These welds were acceptable to the highest quality class B (stringent) of BS EN ISO 13919-2:2001, with a porosity of only 0.3% of the cross-sectional area of the weld, and close to class A of AWS D17.1. Transverse proof strengths of ~60% of parent material were achieved. Development of hybrid welding is ongoing with novel fillers to refine weld metal grain structure and improve weld properties.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference3 articles.
1. Palm F: Plenary session given at Workshop on Laser Applications in Europe, Fraunhofer IWS, Dresden, Germany, 23-24 November (2005).
2. Verhaeghe G: Welding Journal, Vol. 84, No. 8, Aug 05, pp.56-60.
3. Matsunawa A, Mizutani M, Katayama S and Seto N: Welding International, Vol. 17, No. 6, pp.431-437. 100 µµµµm 100 µµµµm.
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