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Prediction and control of porosity in laser welding of non-ferrous metals

Obiettivo

Laser welding is a robust process for producing full penetration welds in steels. Welds in non-ferrous materials (such as Al and Ti), achieving acceptable weld quality is less straightforward. Of particular concern is porosity formation in the deep penetration. Achieving low levels of porosity in a reproducible way is currently preventing acceptance of laser welding in the aerospace and to some extent, in the automotive industries, in spite of the economic and manufacturing benefits. The porosity problem in laser welds is well documented in published literature but it is often very difficult to compare the results. Recent developments in high brightness solid-state lasers such as Yb-fibre and Yb:YAG disc lasers increase the possibilities for laser welding in these fields. In comparison to the other lasers, the fibre laser represents a better beam quality, higher cost efficiency and more flexible integrated system with a promising future. There is very little results available using the latest high brightness lasers. There is a clear need for better understanding the beam-materials interactions when welding with these high brightness lasers.
The objective of this project is to develop technical solutions for achieving high quality (low porosity) laser welds and to establish guideline for using fibre laser welding in non-ferrous metals including aluminium and titanium.
The specific objectives are:
1. To carry out numerical modelling to simulate the interactions between the laser beam and molten metal
and to understand the formation of porosity in laser welds in non-ferrous metals;
2. To develop monitoring techniques for direct observing the weld pool behaviours in laser welding and
hybrid laser-MIG welding, using high speed camera;
3. To establish the characteristics of plume formations during laser welding and to develop techniques for
effective suppression of plumes in laser welding;
4. To produce recommendations for eliminating porosity in laser welded non-ferrous alloys

Invito a presentare proposte

FP7-PEOPLE-2009-IIF
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Coordinatore

TSINGHUA UNIVERSITY
Contributo UE
€ 15 000,00
Indirizzo
QING HUA YUAN
100084 BEIJING
Cina

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Tipo di attività
Higher or Secondary Education Establishments
Contatto amministrativo
Dong Du (Dr.)
Collegamenti
Costo totale
Nessun dato