Getting the strain under control: Trans-Varestraint tests for hot cracking susceptibility
Version 2 2019-06-11, 09:12Version 2 2019-06-11, 09:12
Version 1 2019-06-11, 09:01Version 1 2019-06-11, 09:01
Posted on 2019-06-11 - 09:12 authored by Rob Thornton
A new method for conducting Trans-Varestraint tests for assessing hot
cracking susceptibility is proposed. Experiments were carried out, to validate
the new method, with an industrial scale rig using tungsten inert gas welding. The
hot cracking susceptibility of API-5L X65 and EN3B steel was compared. The
results indicated that, by using the new method, the strain applied to the
welding bead and consequently to the solidification front was controlled in a
repeatable and reliable way. The results also indicated that EN3B has a maximum
crack length (a parameter in the test) higher than X65 and it is reached at
lower augmented strain thus demonstrating it is more susceptible to hot
cracking, while also indicating that there is a capability of predicting the
initiation position of hot cracks during welding. By using the method proposed,
the capability of setting standardized test procedures for Trans-Varestraint
tests is improved. It is recommended that future tests for assessing hot
cracking susceptibility should employ the proposed method in order for the
results to be comparable and to also study the effect of strain rate in hot
cracking of materials.
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Statharas, Dimitrios; Atkinson, Helen; Thornton, Rob; Dong, Hongbiao (2019). Getting the strain under control: Trans-Varestraint tests for hot cracking susceptibility. University of Leicester. Collection. https://doi.org/10.25392/leicester.data.c.4389710.v2