When laser welding light weight materials, for example aluminium and titanium based alloys, small sub-millimeter pore defects occasionally forms. Due to their small sizes, as individuals they have low impact on the fatigue life of the welds. The fatigue life might however be affected if they can no longer be considered as individuals and thus their inter-spacings are important. Further, it is already known that the defect distance from the surface affects the fatigue life. If one could detect and measure the full 3-D position of each small pore in an industrially feasible way it would be possible to make better fatigue life predictions.
This project aim is to develop a digital X-ray inspection procedure, together with algorithms, to make in-line measurement of the full 3-D positions of the pores industrially feasible at the manufacturing level. Further the output of the non-destructive evaluation should be closely linked with a fatigue model outputting an approximated fatigue life for each individual weld volume. The overall aim is thus to connect the non-destructive evaluation (NDE) tighter with integrity and quality assessment (IqNDE).
Project leader is Per Henrikson from GKN Aerospace Engine Systems.
The project is connected to Sientific Centre of nondestructive testing (SCeNDT)