Procedures of Welding Inspection Upon Completion Of Welding31 July 2020
In order to fully inspect the quality of a welded material, it is important to carefully check if they adhere to certain specifications. Among these are code and standards, gauges and prints, finishes and contours, cracks against standards, overlaps, undercuts, and spatters with consideration to acceptable levels. Below is a more elaborate overview of procedures of welding inspection upon completion of welding.
Post-Welding Inspection Overview
Once the actual welding process has been completed, size, length and location of all welds will be check to ensure that they conform to the drawings, specifications and code. No welds will be added without approval. Dimensional and visual checks of the weld must not identify welding discontinuities, excessive distortion and poor workmanship.
Temporary Attachments and Attachment Welds
Aside from that, temporary attachments and attachment welds must be removed and blended with base metal. Discontinuities are then reviewed against acceptance criteria for defect classification. PMI of the weld must be shown, if required and examiner’s findings must indicate they comply with the specification.
It is also important that the welder stamping or marking of welds be confirmed. One of the processes include performing field hardness check. It is also important to verify if NDE is performed at selected locations and review examiner’s findings. Specified locations are also examined as well as the specified frequency of examination.
Afterwards, NDE is performed after final PWHT. They will also incorporate the work of each welder included in random examination techniques. RT film quality, IQI placement, IQI visibility, etc. will be inspected making sure it complies with standards.
Inspector also must be in agreement with examiners interpretations and findings. It is also best to ensure that the documentation for all NDE is correctly executed. Verification of post-weld heat treatment is performed to the procedure and produces acceptable results.
Paint marking and other detrimental contamination, as well as temporary attachments must be removed. Machined surfaces are then protected from oxidation. Equipment internals, such as valve internals are detached to prevent damage. Equipment is then supported to prevent distortion. Thermocouples must be fastened properly. Thermocouples are then adequately monitored in the different temperature zones and thickest or thinnest parts in the fabrication.
Temperature monitoring system is then calibrated. Local heating bandwidth must be adequate since insulation applied to the component is required for local heating. Temperature and hold time must be correct as well as the heating rate and cooling rate. Distortion must be acceptable after completion of the thermal cycle. Hardness indicates an acceptable heat treatment Verify pressure test is performed to the procedure Pressure meets test specification.
Test duration is as-specified by the inspector. Metal temperature of component must meet minimum and maximum requirements. Pressure drop or decay is acceptable per procedure. The visual examination does not reveal defects. It is also important to perform a final audit of the inspection dossier to identify inaccuracies and incomplete information. All verifications in the quality plan must be properly executed. Inspection reports must be complete, accepted and signed by responsible parties. Inspection reports, NDE examiners interpretations and findings must be accurate.
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