Post-weld Strength Prediction for Aluminium-Lithium Alloy
Aluminum–lithium (Al–Li) alloys are very attractive for potential aerospace applications due to their lower density, higher specific strength properties, compared to conventional aluminum alloys. Laser beam welding (LBW), being an advanced joining method, has already been approved for applications involving aluminum alloys. However, there are still a number of problems to be answered and solved in LBW of Al–Li alloys. How to estimate and improve the strength of welded joints is one of the key issues to be used in a wider range of applications.
A post-weld strength prediction (PWSP) model was developed to express the relationship between the weld shapes and mechanical properties of welded joints. The effects of the weld porosities in the weld on the mechanical properties of welded joints are considered in the PWSP model. The research results can be used to guide the welding processing, to predict the yield strength of welded joints and to evaluate the effect of welding porosity on the mechanical properties of joints.
Mr Enguang He (Beijing Aeronautical Manufacturing Technology Research Institute, AVIC)