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Materials Technical Group Meeting: Weld Cracking - Mechanisms and Mitigation

Weld cracking is a serious issue that has in the past led to catastrophic failure of welded structures, vessels, pipelines and other assets and continues to pose a threat.

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Weld cracking is a serious issue that has in the past led to catastrophic failure of welded structures, vessels, pipelines and other assets and continues to pose a threat.

Knowledge of crack types and an understanding of the mechanisms by which cracking can arise are both essential to ensure the avoidance of cracking.

Also required is a knowledge of the factors that give rise to cracking. Materials susceptibility, joint design, welding process and procedure details including consumable selection, pre-heat, heat input and post weld heat treatment etc. all play an important role. Capability and selection of non-destructive testing techniques is also of paramount importance, as are in-service conditions and inspection strategies.

This webinar will delve into this crucial subject drawing on the knowledge and experience of TWI experts and speakers from industry.

Cracking types and mechanisms will be described and several case studies will be presented. Mitigation methods and management strategies will also be explored.


- Professional Members of The Welding Institute: £25 + VAT (£30)

- Industrial Members of TWI: £25 + VAT (£30)

- Non-members: £95 + VAT (£114)

- Retired Members: £25 + VAT (£30)

- Students: £25 + VAT (£30)

- TWI Training School Customers: £70 + VAT (£84)

- TWI Staff - please contact Becki Parratt if you wish to register

Please note that payment must be made before the event in order to receive the joining instructions for the event.


If you can't join us on the day, you can still access the recording of the webinar and the presentation (contingent on the approval of the presenters) by registering ahead of the event.


Registering on this Technical Group webinar as a non-member or a TWI Training Customer gives you full Associate Membership (AWeldI) for one year. To activate your membership, just complete the highlighted fields on the event registration form.

You will also benefit from:

- Discounted registration fees for Technical Group events (£25 + VAT)

- Free attendance at Branch events

- Access to our knowledge database including our library and information services


The Welding Institute awards points towards CPD for delegates attending this webinar. Every hour attendance of an event will earn 2 points towards your continuing professional development.

Please contact if you require a certificate of attendance towards your continuing professional development.


Joanna Nicholas
Team Manager, Metallurgy, Materials and Structural Integrity Group

Joanna joined TWI in 1999, and has been involved in research, materials selection and failure investigations, mainly with ferritic steels. Joanna has also supported engineering critical assessment activities by undertaking post-test metallographic assessment on fracture toughness test specimens. She has also been involved in various aspects of computer modelling, particularly for research projects.

Joanna has broad knowledge of ferritic steels with particular emphasis on hydrogen cracking and hydrogen diffusion, HAZ hardness, mooring chain, fasteners, in-service welding and 9% Ni steels. She has carried out numerous investigations in these areas including failure investigation as well as production qualification and research. She currently serves on several BSI committees, providing welding and metallurgy input to the standards as required. Joanna lectures on the IIW/EWF diploma, and provides training and mentoring in other areas of welding metallurgy specialisms.

Joanna was awarded CEng in 2005, IWE in 2016, FWeldI in 2017 and FIMMM in 2018. Joanna is a STEM Ambassador, and delivers various activities to local schoolchildren, aiming to retain their interest in science, technology, engineering and mathematics, and was awarded the Welding Institute/Armourers and Brasiers Award for Best STEM Ambassador in 2015.

Dave Howse - Consultant Welding Engineer

David Howse has more than 30 years’ experience in welding engineering, having worked on major projects relating to oil and gas, construction and infrastructure. He graduated in metallurgy from Leeds, later completing an EngD entitled ‘Improved productivity in fusion welding’ at Warwick, and has authored and contributed to more than 20 publications.

David joined TWI in 1994 as a senior project leader in the arcs section. He later spent time as section manager in lasers before, more recently, assuming a senior technical role in the Arc Processes, Fabrication and Welding Engineering section. David has provided technical support to many of TWI’s member companies and overseen a large number of research projects into various aspects of joining technology.

About TWI Ltd.

We are a membership-based organisation, supporting both individuals and companies alike. We exist to provide authoritative and impartial expert advice, knowhow and safety assurance through engineering, materials and joining technologies – helping you design, create and operate the best products possible.

Descended from the British Welding Research Association (BWRA), we have grown into one of the foremost independent research and technology organisations. We span innovation, knowledge transfer and problem resolution across all aspects of welding, joining, surface engineering, inspection and whole-life integrity management.

TWI’s single client projects bring together experts from TWI and the Member to provide solutions directly focused on assisting the Member’s business. The work undertaken is confidential with the outcomes and associated intellectual property owned exclusively by the client.

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