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Before welding, start with preparation
A useful visual inspection begins by checking conditions that influence the result: material identification, joint preparation, root opening when applicable, alignment, cleanliness, and visible contamination. Consumables, process, and position should also match the applicable fabrication documents or welding procedure. Finding a problem here is usually easier than repairing a completed weld.
During welding, observe stability and sequence
When in-process inspection is part of the job, observe arc stability, shielding where applicable, deposition technique, interpass cleaning, and the planned sequence. The inspector is not replacing the welder or changing parameters without authority; the role is to identify visible deviations and verify that execution follows the approved procedure.
After welding, look for surface discontinuities and finish
A completed weld can be checked for visible cracking, undercut, surface porosity, insufficient fill, overlap, excessive spatter, arc strikes, and irregular profile. Appearance alone is not the acceptance criterion, however. Findings must be compared with the code, standard, drawing, or specification that governs the job.
Measurement turns opinion into evidence
Simple gauges and measuring tools can verify fillet size, reinforcement, misalignment, undercut depth, and other required dimensions. Without measurement, comments such as “too high” or “too small” remain subjective. Recording values, location, and extent makes the inspection more traceable and useful for technical decisions.
Visual inspection has clear limits
Visual inspection mainly addresses accessible surface condition and geometry. It cannot by itself confirm the internal integrity of a joint. When a project requires detection of internal discontinuities, other nondestructive examination methods may be necessary. Inspectors should understand the method’s limits and avoid conclusions beyond what was actually observed and measured.
Practical checklist
- Confirm drawing, procedure, and acceptance criteria
- Check joint preparation, alignment, and cleanliness
- Observe execution and interpass cleaning when applicable
- Measure required dimensions with suitable tools
- Record indication, location, extent, and result
Frequently asked questions
Does visual inspection replace ultrasonic or radiographic testing?
No. It mainly evaluates visible condition and geometry; other methods may be required to assess the interior of the joint.
Is every visible discontinuity a rejection?
Not necessarily. Acceptance depends on the criteria governing the specific job.
Why measure the weld?
Measurement reduces subjectivity and allows direct comparison with limits defined by a code, drawing, or procedure.
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