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VT · PT · MT · RT · UTWelding

NDT — non-destructive testing of welds

What is it?

Methods that check welds without cutting them: visual (VT, ISO 17637), penetrant (PT, ISO 3452), magnetic (MT, ISO 17638), radiographic (RT, ISO 17636) and ultrasonic (UT, ISO 17640). RT/UT are the demanding volumetric methods.

What evidence should a candidate have?

Test reports or references stating the welder's joints passed RT/UT; for inspectors, ISO 9712 personnel certification.

Why it matters for staffing

“My welds passed RT/UT” backed by reports means verified high quality; only visual inspection (VT) means basic-level evidence.

Official sources
ISO OBP (ISO 17637, 17636, 17640, 3452, 17638) ↗
Used in trade modules
WelderPipefitter / Industrial fitter
Related standards
EN ISO 9606
EN ISO 9606 — welder qualification test
EN ISO 5817
EN ISO 5817 — weld quality levels B, C, D
EN 1090
EN 1090 — execution of steel structures (EXC1–4)
EN ISO 3834
EN ISO 3834 — welding quality management

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