P Numbers im Vergleich zu calcISO10675 Nutzung und Statistiken
P-Numbers: Quick lookup of base metal weldability grouping numbers for welding procedure and performance qualification. Data is provided by C-spec from the master source used for generation, proof-reading and maintenance of ASME Section IX Table QW/QB-422, AWS B2.1 Table C1 and C2, and ISO/TR 20173.
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You found the Acceptance levels for radiographic testing (imperfections for welds) in the ISO 10675.
This App calculated the value for one concretely weld.
Select the material, then input the geometry of the weld, then select the imperfections.
The result for this weld is displayed.
You can now the result compared with the measurement.
The weld is OK or not.
Only internal indications in butt welds. Surface imperfections use the App CalcISO5817.
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P Numbers VS. 
calcISO10675Januar 18, 2026