UT Calibration Blocks Explained: FBH, SDH & Step Wedges
Flat-bottom holes, side-drilled holes, step wedges — what each UT reference reflector does and which block your procedure actually needs.
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NDT Calibration Block Guides
UT Blocks, PAUT/TOFD Standards, Flawed Specimens & Compliance — Explained Practically
Plain-language guides from the people who machine the blocks: how UT, PAUT and TOFD reference standards work, how flawed specimens train inspectors, what your ASME/ISO certificate must show, and how to make blocks last decades. Every article links to the related product it talks about.
Featured NDT Articles
Featured
UT Calibration Blocks Explained: FBH, SDH & Step Wedges
Flat-bottom holes, side-drilled holes, step wedges — what each UT reference reflector does and which block your procedure actually needs.
Featured
PAUT vs TOFD Calibration: Which Reference Block Do You Need?
Phased-array and TOFD share welds but not calibration philosophy — how to pick Type A/B PAUT blocks vs TOFD blocks with EDM notches.
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Calibration Blocks
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Calibration Blocks
PAUT vs TOFD Calibration: Which Reference Block Do You Need?
Phased-array and TOFD share welds but not calibration philosophy — how to pick Type A/B PAUT blocks vs TOFD blocks with EDM notches.
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Flawed Specimens
How Flawed Specimens Train Better NDT Inspectors
Real cracks, pores and inclusions implanted in training specimens — why inspectors certified on flawed specimens find real defects faster.
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Standards & Compliance
ASME Section V & ISO 17025: What Your Block Certificate Must Show
Auditors reject calibration blocks for paperwork, not metal — the five certificate elements your QA file needs before the audit.
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Validation
Validation Blocks vs Calibration Blocks: What's the Difference?
Calibration sets your instrument; validation proves your whole inspection system works on the real geometry. When you need each one.
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Maintenance
Extending Block Life: Care, Storage & Recalibration Guide
A certified block lasts decades if treated right — storage, couplant cleanup, corrosion control and when to send it back for recalibration.
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Recent NDT Articles
UT Calibration Blocks Explained: FBH, SDH & Step W...
PAUT vs TOFD Calibration: Which Reference Block Do...