ASNT NDT Level III MT case studies
ASNT NDT Level III MT · Put your knowledge to work in context.
The ASNT NDT Level III - Magnetic Particle Testing (MT) Method Examination is the method-specific component of ASNT's Level III certification program, aimed at experienced MT personnel who develop, qualify, and administer procedures rather than only perform tests. Candidates are typically technicians moving into Level III responsibility, quality or engineering staff who sign off on MT techniques, and auditors or trainers who must defend MT decisions to codes and clients. The ASNT NDT Level III MT case studies are 5 cases and about 3,748 words.
1Fillet Indications and Stubborn Residual Field on a Cast Lever
A normalized cast carbon-steel lever (0.30% C, 300 mm long) is inspected on a wet fluorescent bench. The arm tapers from 25 mm down to 12 mm through a 3 mm fillet radius.
805 words, about 4 min2Fluorescent Bench Losing Sensitivity After Forty Parts
A wet horizontal fluorescent bench has processed about 40 production parts since the bath was made up. A settling test (100 mL, 60 minutes) reads 0.2 mL, inside the 0.1-0.4 mL acceptance range.
762 words, about 4 min3Setting a Yoke Technique on a Flush-Ground Butt Weld
A 25 mm thick carbon steel butt weld, 800 mm long, is ground flush and must be inspected 100% by magnetic particle, covering 25 mm of base metal each side. The only tool on site is an AC electromagnetic yoke rated to lift 4.5 kg at pole spacings up to 150 mm; the legs are adjustable.
764 words, about 4 min4Purchaser Specification, Code, and Shop Procedure Disagree
The contract drawing invokes ASME Section V Article 7 and ASTM E709 for magnetic particle testing, with acceptance per the purchaser's specification. The purchaser's specification requires wet fluorescent MT, black light of at least 1000 uW/cm2, and residual field of 3 G maximum after inspection.
715 words, about 4 min5A Rounded-Looking Toe Indication and a Ground-Out Indication
During final inspection of a pressure-retaining nozzle-to-shell weld you find a 6 mm long, 3 mm wide indication at the toe, oriented transverse to the weld. The project specification states: any indication whose length exceeds three times its width is a linear, rejectable indication; rounded indications are acceptable up to 5 mm individual length, provided no more than three occur in any 150 mm of weld.
702 words, about 4 min