F Numbers im Vergleich zu calcISO10675 Nutzung und Statistiken
F Numbers: Quick lookup of filler metal groupings for welding procedure and performance qualification. Lookup includes classifications with respective descriptions of intended use. Data is provided by C-spec. F-numbers and A-numbers assignments are based on ASME Section IX Table QW-432 and QW-442, ASME Section II Part C, AWS B2.1 Table B1 and B2, and AWS A5.1 through AWS A5.36.
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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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F Numbers VS. 
calcISO10675Januar 18, 2026