Mechanised Post-weld treatment of welded structures for automotive and cargo applications (MIDWEST)

Important results from the project

An overall goal for MIDWEST was to show that it is possible to robotize weld improvement methods and that the results are as good as for manual processing. The project has shown this - and that for HFMI and TIG even better results can be achieved with robotization. The partial goal of creating an adaptive robot path that can follow the weld toe line was reached. Also the sub-goals to robotize the methods HFMI and TIG with this adaptive technology. But the sub-goal of robotizing burr-grinding has only reached proof-of-concept, as the grinding equipment was too weak for a robotic application.

Expected long term effects

MIDWEST has developed mechanization solutions for important weld improvement methods. This provides increased fatigue life, improved capacity and quality, reduced scraping and more sustainable and efficient manufacturing. These solutions are important for wheel loaders, loading cranes, forklifts and fatigue loaded components. The results are also interesting for other industries. For 2 of 3 methods studied, good results have been achieved: robotic HFMI and TIG treatment have given excellent results. The technology for adaptive robot path is to be commercialized in 2024.

Approach and implementation

The work was carried out in 6 work packages 2020-2023 in close cooperation between the participants. The project´s budget was SEK 7.8 million, half from Vinnova. The technology development with the adaptive robot path took longer time and more resources than planned to develop into a functioning system. The system should handle all types of welds and component geometries (more geometries, more problems). The informal collaboration and being able to develop the robotics in two different test cells have been very fortunate. Probably essential for success - and that so much could be done.