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Leading Edges in Welding

Mint weld summer school

Mathematical modelling of welding: A Summer School

TWI hosted the first ever Summer School for the mathematical modelling of welding in July-August 2012. This event "Leading Edges in Welding" organised in collaboration with the University of Leicester, was attended by students, engineers and visiting academics even from as far afield as China and from both academia and industry. Talks were given by universities and companies from all over the world on the modelling at length scales, from quantum scale up to millimetres, combined with practical workshops to illustrate the techniques taught.

Welding is the most economical and effective way for permanently joining metals and it is an essential component of manufacturing. Welding interfaces and grain boundaries play a key role in the properties of welds and modelling these phenomena is critical to understanding and improving weld quality. TWI is a partner in MintWeld, a Framework 7 European Collaborative project set up in order to create an integrated series of models at all length scales validated by mechanical testing and detailed characterisation. A large part of this project involved the dissemination of information gained from these models by means of a summer event to reach the wider modelling community.

The event was structured with mornings given over to technical lectures and discussions and the afternoons devoted to computer-based or hands-on workshops. Notable talks from academia included a presentation on the microstructure and property modelling for friction stir welding by Dr Joseph Robson (Manchester University), and modelling of rolling methods in order to reduce residual stresses in welds as given by Dr Paul Colegrove (Cranfield University). Industry was well represented with TWI and Tata Steel both giving talks on welding and residual stress distortion.

On the first day, the attendees carried out a workshop on critical analysis of residual stress in a welded pipe section, using real data from the Rutherford Appleton Laboratory's neutron diffraction facilities. This was closely followed on the second day with a workshop by Technical University Delft using custom software to model the flow of metal in a weld pool under laser melting. TWI hosted a practical workshop on welding polymers, in order to give the attendees real experience and appreciation for welding and the various parameters that affect the weld quality. The University of Leicester ran the final event where the students directly modelled solidification of weld metal and the growth of the microstructure, studying how these parameters could affect the overall quality of the weld.

The event was a great success, with the majority of attendees giving positive feedback and indicating interest in future related workshops. It is planned to run a similar event again in 2014, hosted by the University of Leicester and open to students and engineers of all levels of experience.

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