Weld Mapping for Crane Structures: Building a Traceable Inspection Record

A weld map can use a marked drawing, a controlled sketch or another agreed location system. Each identifier should point unambiguously to a physical joint. Include orientation, component identity and enough surrounding detail that a later inspector can find the same location.

Avoid relying on descriptions such as 'left weld' without defining the viewing direction. Repeated details, mirrored components and removable assemblies can make informal names ambiguous. Agree the naming convention before inspection reports and repair records start using different references.

The weld mapping and inspection service can help define a location system that connects the structure, drawings and inspection evidence.

The map is an index to evidence, not evidence that every weld is acceptable. Link each joint to relevant drawings, procedure references, fabrication records and inspection results where those records are available. Clearly distinguish documented facts from information that cannot be recovered.

For example, a map of an existing crane may identify all accessible joints while original welder or material records remain unavailable. That map improves location traceability but must not imply that missing fabrication history has been verified.

• Asset, component and drawing revision references.
• Unique weld identifiers with orientation and location details.
• Joint or detail references and available procedure information.
• Inspection method, report reference, coverage and findings.
• Repair history, reinspection evidence and open actions.

Inspection records should explain which parts of a joint were examined and by what method. A 'no reportable indications' result from one accessible face is not the same as complete coverage of every region. Link limitations to the mapped location so they remain visible.

Where a finding needs closer investigation, use a repeatable position reference along the weld rather than a photograph alone. Images support the record, but scale, orientation and the relationship to the weld identifier make them useful later.

When a weld is repaired, preserve the original finding and connect it to the approved repair scope and subsequent inspection. Do not replace the original report with the new result and lose the history. Distinguish an accepted repair from an item awaiting verification.

If a component is replaced or the design changes, update the map under revision control. Old reports should remain interpretable against the arrangement that existed at the time. Reusing an identifier for a different physical joint without explanation can undermine the record.

Store the map where inspection and maintenance teams can retrieve it, together with referenced reports. Check that files remain legible and that document links do not depend on one contractor's temporary folder. Include unresolved areas in the asset's action system.

Weld mapping does not replace NDT, engineering assessment or an approved repair process. Its value is a reliable connection between those activities. A controlled, understandable map is more useful than a visually elaborate drawing whose identifiers no longer match the reports.