Visual Testing Level II: 15 Practice Questions, Answered From the Code

Why visual is the method people fail

Every technician has looked at a weld, and that is exactly the problem. Familiarity produces a Level II candidate who has never measured light at a surface, never used a white light meter, never read Table T-921 and never seen a VT procedure, because the work has always been signed off on judgement. The examination then asks for numbers, and the numbers are not the ones intuition supplies. Article 9 is short enough to read in an afternoon and precise enough to carry an entire exam paper, which makes it the highest-yield reading in the whole certification.

Each question below states a situation, gives the correct answer, and explains the clause or the optics that makes it correct. Answer before reading on. The paragraph numbers are ASME Boiler and Pressure Vessel Code Section V, Article 9, 2019 Edition and later — an edition that changed Article 9 more than most people realise, adding a light meter calibration clause, extending the remote viewing requirement to cover light intensity, and reclassifying one Table T-921 variable. Our Section V compliance page sets out how Article 9 sits against the other method articles.

These are original questions written against the published body of knowledge for visual Level II, not reproduced from any examination. Several deliberately test the boundary between what Article 9 requires and what a referencing code, an employer written practice or a welding code requires, because that boundary is where most real VT disputes actually occur.

Illumination measured at the surface

Question 1. A hand lamp is rated at 500 fc. Does it satisfy T-952? Answer: the rating is irrelevant — what governs is the measured level at the examination surface. Why: T-952 requires a minimum light intensity of 100 fc (1076 lx) and specifies that the light intensity, whether natural or supplemental white light, shall be measured with a white light meter prior to the examination, or that a verified light source shall be used. Illuminance falls with the square of distance from a point source. A lamp reading 500 fc at 12 in. delivers about 55 fc at 36 in., which fails the requirement with no change to the lamp.

Question 2. Ambient light in the bay measures 120 fc, and the weld sits in the shadow of a stiffener. What do you record? Answer: the reading taken at the weld, because the weld is the examination surface, and that reading governs. Why: T-952 ties the requirement to the surface being examined rather than to the room. Illuminance at a point depends on the distance and angle of every source reaching it and on whatever stands between them. A stiffener, a nozzle, scaffolding or the inspector's own body can drop a compliant bay to a non-compliant weld toe. Measure where you are looking, not where you are standing.

Question 3. The light level at the surface reads 140 fc, but the surface is polished stainless and the lamp sits directly behind the eye. What is the problem? Answer: specular glare is destroying contrast even though the illuminance requirement is met. Why: the code sets a floor on light, not a ceiling on reflection. A mirror-finish surface returns the source image straight into the eye, saturating the retina locally and hiding the low-contrast tonal differences that reveal a fine crack or a lack of fusion at a toe. Move the source off-axis, use diffuse illumination, or view from a different angle within the 30 degree limit.

Distance, angle and what counts as direct viewing

Question 4. A weld toe can only be reached with the eye about 30 in. away at a 20 degree angle. What are the options? Answer: improve the access, use a mirror, or move to a remote technique — but do not record it as direct visual. Why: T-952 defines direct visual examination as an examination made when access is sufficient to place the eye within 24 in. (600 mm) of the surface and at an angle not less than 30 degrees to it. Mirrors may be used to improve the angle of vision, and aids such as a magnifying lens may assist. Outside those two limits the examination has left the definition, and the report must reflect what was actually performed.

Question 5. Does using a mirror turn a direct visual examination into a remote one? Answer: no. Why: T-952 explicitly permits mirrors to improve the angle of vision and magnifying aids to assist the examination, all within direct visual. Remote visual examination under T-953 covers systems placing an optical or electronic chain between the eye and the surface — telescopes, borescopes, fibre optics, cameras and similar instruments. The distinction is not about whether a tool is used but about whether the eye receives the scene directly. A mirror redirects the light path; it does not sample the scene and reconstruct it.

Remote viewing and proving resolution

Question 6. What must a remote visual system demonstrate under the current Article 9? Answer: resolution capability and light intensity at least equivalent to that obtainable by direct visual observation. Why: T-953 permits mirrors, telescopes, borescopes, fibre optics, cameras and other suitable instruments in place of direct viewing, on the condition that the system matches direct viewing. The 2019 Edition revised T-953 to include light intensity alongside resolution, closing a real gap: a camera can resolve very finely and still deliver a scene so dim that nothing is discernible in it. Both halves have to be demonstrated rather than asserted in the procedure.

Question 7. How is a visual examination procedure demonstrated to be adequate? Answer: with a fine line 1/32 in. (0.8 mm) or less in width, or an artificial imperfection or simulated condition, placed on the surface to be examined or on a similar surface. Why: Article 9 accepts that artefact as a method of procedure demonstration and directs that the condition be located in the least discernible position on the area under examination. Placing the target where viewing is easiest proves nothing about the technique. Placing it at the worst point in the geometry, the dimmest corner or the shallowest viewing angle, proves the technique holds everywhere else.

Vision testing: the requirement that is not in Article 9

Question 8. Which paragraph of Article 9 requires an annual eye examination? Answer: none — Article 9 sets no vision requirement of its own. Why: personnel qualification reaches Section V through Article 1 and the referencing code section, which point to the employer's written practice built on ASNT SNT-TC-1A or ANSI/ASNT CP-189. SNT-TC-1A calls for natural or corrected near-distance acuity in at least one eye sufficient to read a minimum of Jaeger Number 2, or equivalent type and size letter, at the distance designated on the chart but not less than 12 in. (30.5 cm), administered annually. Colour contrast differentiation is examined at initial certification and at five-year intervals.

Question 9. A fabricator working to AWS D1.1 says its inspectors are tested to Jaeger J-2 at 12 to 17 in. Does that satisfy the vision requirement on a Section V job? Answer: the acuity level matches, but the governing document and the re-test interval do not transfer automatically. Why: D1.1 states its own inspector vision requirement for work under that welding code, while Section V work runs on the employer's written practice, which under SNT-TC-1A calls for annual near-vision testing. One technician can hold two certifications carrying two different intervals. The written practice controls the Section V examination — a distinction set out in full in SNT-TC-1A against CP-189.

The written procedure VT is assumed not to need

Question 10. Does visual examination need a written procedure? Answer: yes. Why: T-921 requires visual examination to be performed in accordance with a written procedure containing, as a minimum, the requirements listed in Table T-921. That table covers how the examination is to be performed, the type of surface condition available, the method or tool used for surface preparation, whether direct or remote viewing is used, special illumination, instruments or equipment, the sequence of performing the examination, data to be tabulated, documentation including checkpoints and forms, and personnel performance qualification requirements when required. The 2019 Edition reclassified that last item as a nonessential variable.

Question 11. Your approved procedure covers direct viewing of a vessel interior. A nozzle now needs a borescope. What happens? Answer: the change engages the procedure's variables and cannot be made on the technician's judgement at the workface. Why: T-921.2 requires requalification of the written procedure by demonstration when a Table T-921 essential variable changes, and requires that any change of an essential or nonessential variable be captured by a revision or an addendum to the written procedure. The practical answer is to carry both techniques in the procedure before mobilising, which is a planning task rather than a field one — see technical procedure development.

Question 12. How often must a white light meter used for VT be calibrated? Answer: at least once a year, or whenever it has been repaired; and if it has not been in use for one year or more, before it is used. Why: T-955 states it. This clause was added in the 2019 Edition — before that, Article 9 carried no light meter calibration requirement at all, and shops leaned on the equivalent clauses in Articles 6 and 7 by analogy. An aged photodiode drifts, and the direction that matters is a meter reading high, since it certifies a surface as compliant when it is not.

Translucent examination and where acceptance criteria come from

Question 13. What is translucent visual examination for? Answer: examining translucent materials by transmitting light through them rather than reflecting it off the surface. Why: T-954 treats it as a supplement to direct visual examination. An illuminator behind the part produces directional light passing through the laminate, so thickness variations, inclusions and delaminations appear as differences in transmitted intensity — the technique often called candling. Ambient lighting must be arranged so surface glare and reflections do not compete with the transmitted image, and kept below the light applied through the region under examination.

Question 14. A visual examination finds undercut measuring one sixteenth of an inch deep. Is it rejectable? Answer: Article 9 does not say — evaluation is against the acceptance standards of the referencing code section. Why: T-980 makes that explicit, and it reflects the structure of Section V as a whole. Section V tells you how to perform an examination; Section VIII, Section I, B31.3 or the purchase specification tell you what is acceptable. A VT report recording an indication without naming the acceptance document it was judged against is not defensible, which is the subject of what makes an NDT report defensible.

Documentation: the checklist

Question 15. Article 9 requires something in the documentation that the other method articles do not. What is it? Answer: a checklist. Why: T-990 requires that a checklist be used to plan the visual examination and to verify that the required visual observations were performed, and states that the checklist establishes minimum examination requirements rather than a ceiling on what the manufacturer may examine in process. The written report itself carries the date, procedure identification and revision, the technique used, the results, identification of the part examined, and the examiner's identity with qualification level where the referencing code section requires it.

The checklist requirement exists because visual examination has no film, no A-scan and no developed surface to fall back on. Every other method leaves an artefact that can be re-read years later; VT leaves only what the examiner wrote down. The checklist is the code's substitute for that artefact, converting an unrepeatable observation into evidence that specific observations were planned and made. Auditors know this, and a VT package presented without a checklist invites scrutiny of everything else in the file.

Where VT Level II candidates lose marks

The first failure is treating illumination as a property of the lamp. Nearly every wrong answer in the lighting block traces to that single error: a candidate who thinks in lamp ratings gets the surface measurement question wrong, then the shadow question, then the glare question. Fix the concept — the requirement lives at the surface, not at the source — and three or four marks resolve together. Carry a meter on real jobs for a month and the concept stops being theoretical.

The second failure is looking inside Article 9 for the vision requirement. It is not there, and time spent hunting for it is time lost. Vision reaches the job through Article 1, the referencing code section and the employer's written practice built on SNT-TC-1A. Understanding that chain answers the vision question, the personnel qualification question in Table T-921 and the acceptance criteria question in T-980, because all three are instances of Section V deferring to a document outside itself.

The third failure is assuming visual needs no procedure. It does, T-921 says so, and the procedure carries the illumination, viewing method, sequence and documentation that the rest of the exam asks about. Candidates preparing formally will find VT covered in our training programme, and crews certifying together are handled through corporate NDT training. Where an employer has no compliant VT procedure or written practice at all, that is a document problem solved through ASNT Level III consulting, not through re-examining technicians.

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