Characterisation and fatigue life prediction of laser welded titanium

Purpose and goal

The purpose and goal of the project was to focus on experimental work using results from a previous NFFP5 Call1 projects which had focused on computer simulations and modeling (´Detection and classification of defects with Digital Radiography Technology of Laser Welded Titanium´). The developed algorithm in the previous project has been verified experimentally in this project with positive results. The goal of having fully performed the experimental fatigue test on structures have been delayed in time due dependencies on other related activities in the project.

Results and expected effects

An experimental verification of a developed algorithm in a previous NFFP5 Call1 project (´Detection and classification of defects with digital radiography applied to laser welded titanium´) has been performed for the detection, positioning and sizing of pores in welds. In the continuing work on validation, a detailed specification of the weld test specimens for fatigue testing is generated in cooperation with GKN Aerospace in Trollhättan. This work will continue in the NFFP6 project ´Validation of the system for life assessment of structures in Laser Welded Titanium´.

Approach and implementation

During the project, quarterly steering group meetings were held. At these meetings, the work performed was reviewed and upcoming work planned. Activities where GKN contribute and provide input work was planned and discussed. Furthermore, project economy was reviewed and potentially project risks were discussed. The work progress has followed the project plan, but the work package dependencies between each other and their sequential execution has delayed some activities, especially around the implementation of the experimental fatigue test and subsequent analysis.