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FRICTION STIR WELDING
The crash site of the Virgin Pendolino train which derailed near Grayrigg in Cumbria on 23 February 2007 Photo Courtesy of RAIB
bodies’ and prEN 15227 on ‘Railway assessor organisation, e.g. under the economic benefits of the FSW process
applications – Crashworthiness Welding Fabricator Certification have led to rapid development and
requirements for railway vehicle bodies’. Scheme, with necessary skills and international use of the technology in
The process of welding has always accreditation to do this work many industrial applications. New
required a high level of skill and control, (see www.iso3834.org). standards are being implemented in
to ensure that welds are fit for purpose. Europe, and the Welding Fabricator
This recognises the fact that it can be Concluding remarks Certification Scheme is designed, to allow
difficult or expensive to check all welds FSW has been widely recognised for its welding fabricators to demonstrate
once they are made, while at the same ability to provide high weld quality and compliance with ISO 3834 on quality
time a poor quality weld could have low distortion in a wide variety of requirements for fusion welding of
disastrous implications in terms of aluminium structures. The technical and metallic materials.
safety. Draft European standards such
as prEN 15085-2 on ‘Railway
applications – Welding of railway vehicles
and components’ are therefore adopting
an approach which is based on standards
already used in the German rail sector.
The new approach will require
fabricators to demonstrate compliance
with ISO 14731 and ISO 3834. Together,
biography biography
these standards cover requirements
for the welders and the manufacturing
Stephan Kallee Calvin Blignault
facility. Compliance with these standards Stephan Kallee gained his Diploma in Calvin Blignault joined TWI as a Project Leader
must be demonstrated by independent
Mechanical Engineering at the Technical in the Friction and Forge Process Group in
University of Munich. After completing a 2006 shortly after the completion of his
third party assessment. All suppliers to course as a European Welding Engineer, he Doctorate Technology (DTech) at the Nelson
the European market will, in future, be
joined TWI in 1995, where he now focuses on Mandela Metropolitan University (NMMU) in
land transport. Port Elizabeth, South Africa.
required to engage with an impartial
www.europeanrailwayreview.com EUROPEAN RAILWAY REVIEW
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