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Weld defect (head, web and foot)
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Internal defects that occur within the head, web or foot of a rail at welds joining rails. they usually start from imperfections within the weld zone, for example lack of fusion or inclusions from the welding process. visual detection is only possible after the defect has reached a surface.
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Inclusions, английский
- Undesired materials in a solid matrix.
- Prokaryotic cell cytoplasmic structures for storing specific nutrients and other resources needed by cells
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Detailed inspection, английский
Investigation of specific aspects of the infrastructure condition or behaviour in detail which may involve visual inspection, measurements, testing and some diagnostic assessment for the following purposes: determining required repairs or remedial actions. capacity rating. assessing proposed changes to the required functional capability. determining condition standards or assessment rules. these are in addition to the requirements for general inspection. at "special locations" detailed inspections should be used to determine and review the defined events.
Interlocking, английский
Interconnection of signalling components and systems designed so that no conflicting movements can be signalled.
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