One relevant condition is not the complete mechanism record.
Retain the coupled conditions
TWI describes hydrogen cracking through combined hydrogen, a susceptible hard brittle structure and tensile stress. A single field cannot represent that coupled condition. Primary reference: TWI technical explanation.
The review should preserve how each factor was established for the actual region. A nominal steel label alone does not describe the local structure after welding, and an unspecified hydrogen assumption does not become a measured input.
Build a fictional evidence matrix
Imagine hypothetical investigation A records evidence of tensile stress but leaves hydrogen and local structure unresolved. Investigation B additionally records a structure observation while hydrogen remains unresolved. B contains more evidence, yet neither matrix establishes the complete proposed mechanism.
Use present, absent-supported and unresolved states with the supporting document for each factor. Avoid translating unresolved into absent. These matrices describe investigation logic rather than actual material results or a universal cracking probability.
Connect factors to the joint history
Keep material identity, joint region, relevant process history and each factor’s evidence in the same review record. Distinguish a source of possible hydrogen from a verified local condition. Preserve timing because observations may describe different stages.
Ask the responsible specialist what resolves the missing fields and whether other mechanisms remain plausible. This gives a focused evidence request without prescribing preheat, consumable handling or a repair operation. The goal is a traceable hypothesis whose certainty matches the available information.
Customer Questions
What three factors does the cited review combine?
Hydrogen, susceptible structure and tensile stress.
Does an unresolved hydrogen field mean absent?
It retains missing evidence rather than an absence conclusion.
Does the fictional matrix diagnose a crack?
It identifies the remaining evidence questions.
Primary References
These references support the technical principles discussed in this guide. The worked examples and review questions are educational.
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