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TWI Test House Delivers Test Specimen Fabrications

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Mon, 16 March, 2020

TWI subsidiary company, The Test House, recently provided efficient assistance to ensure the delivery of a project evaluating the sulphide stress cracking (SSC) resistance of Alloy 825 for a single client.

The project, which began in November 2019, involved a series of stages including procurement of welded pipes from Turkey, review of welding procedures and qualification, inspection of welded pipes, fabrication of mechanical and corrosion test specimens, conducting SSC tests at 90°C, and post-test evaluation. The job brought a few challenges for The Test House. They coordinated well with personnel in the purchasing group who were helping with the purchase and collection of the welded pipes from Turkey, and ensured the manpower and machine required was ready to start fabricating specimens as soon as the materials arrived at TWI’s premises. They also worked well with the Mechanical Testing Lab and Metallographic Lab, by providing sufficient specimens for these labs so they could start relevant preparations for testing. The specimen preparations would usually take 2-3 weeks to complete, including cutting the pipes to take test specimens. In the current case, The Test House provided specimens for mechanical and SSC testing within one week of receiving the pipes.

The Test House produced SSC specimens with a good quality of surface finish, which minimised the manpower and time required for the next stage of preparation for the final surface finish (i.e. 0.25µm) as required by the client.

With the efficient assistance from The Test House, TWI was able to carry out two 30-day SSC autoclave tests, for both parent metal and cross-welded specimens extracted from the welded pipes. The project was delivered as scheduled.

This work demonstrated how The Test House can operate to a tight schedule to assist the delivery of single client projects, while maintaining the highest levels of quality in line with the required standards, for our clients.

You can find out more about the work of The Test House here.

For more information please email:


contactus@twi.co.uk