UT Practical Simulator: Practise Ultrasonic Testing from Calibration to Report

What you practise in a UT job

1. Read the work order and confirm applicability: the component, the procedure, the objective and the limitations stated for the job, then check that specimen, material and method agree.
2. Assemble the equipment. Pick the probe the work order calls for; a normal-beam probe chosen for a weld job, or an instrument that does not support the probe, is refused with the reason.
3. Prepare the surface and apply couplant. Lift the probe or lose coupling during a scan and that position earns no data.
4. Calibrate on two references and set the gates. Change velocity, zero or gain afterwards and the calibration is withdrawn, together with the coverage scanned since, so you recalibrate exactly as you would on a real job.
5. Scan for coverage. A pass faster than the lesson limit of 100 mm/s (an educational limit, not a procedure value) is not credited, and the data-quality step stays open until 98% of the required area is covered; the coverage map shows the gaps.
6. Repeat the calibration check after the last scan. Skip it, or run it before the final pass, and the report step stays locked: that is how calibration drift goes undetected on site.
7. Record each indication against its position, submit the training report and go through the debrief with your instructor.

How the UT model calculates what you see

Practical NDT computes UT signals analytically, not with a full-wave or finite-element solver, so a scan runs at interactive frame rates on a phone, a laptop or a headset and behaves the same on each. The screen height of an echo before gain is A = 80 · ρ · E · T · exp[−α(f) · s], where ρ is the reflectivity of the reflector, E combines the beam footprint with the reflector's size and orientation, T is the share of energy that got past nearer reflectors and s is the sound path. Attenuation is scaled from its value at 5 MHz: α(f) = α₅ · (f / 5 MHz) to the power 1.3.

Two consequences are worth practising on purpose. The footprint widens with sound path in proportion to wavelength over probe diameter, so a small, deep reflector returns less than a large, shallow one. And a planar reflector answers strongly only close to normal incidence, so probe angle and scan direction decide what appears on the screen. Grain noise is a fixed function of position, which means the same scan always shows the same noise and one attempt can be compared fairly with the next. Angle-beam jobs unfold the first, second and third legs through the plate. The UT runtime carries 22 specimen datasets: nine base-metal, ten weld and three casting.

Training simulator or engineering simulation?

Engineering simulation software models wave propagation to design and validate an inspection technique. A training simulator such as Practical NDT uses analytical signal models that run on a phone or a headset, so that a trainee can rehearse performing the procedure: probe choice, calibration, coverage and reporting. Use engineering simulation to qualify a technique, and a training simulator to practise carrying it out.

Why manual UT is drilled as a procedure

In the UK PANI 3 programme, 40 operators gave the same manual ultrasonic task to the same welded test pieces. Average detection per test piece ranged from 58% to 67%, individual defects were missed at rates from 13% to 58%, and years of experience predicted performance less well than measures of ability did. The study also found that 54% of operators did not consider all the information available from their scans before deciding what an indication was. That is an error of method, not of knowledge, and it is the kind of error repetition with feedback can reduce. In the simulator, interpretation is written against recorded observations and then reviewed by the instructor; the software gives no automated verdict.

Where the UT jobs run

UT jobs run across the shared catalogue: bench specimens and reference blocks in the NDT lab, weld coupons in the welding workshop, thickness and weld work on the process plant, jobs in the aircraft hangar and shell thickness surveys on the storage tank. Each job pins the revision of its environment, specimen, procedure and equipment, and each equipment model is referenced to the manufacturer documentation of a named real instrument or probe.

Every job runs at three levels of assistance. Guided shows the instruction, the expected result and the recovery for each step, which is where a first two-reference calibration belongs. Coached hides the expected result, so you have to recognise a correct calibration response yourself. Independent gives you the work order only, the setting to use before a practical examination.

What the UT simulator cannot teach

The model is a teaching approximation, and distance-amplitude correction (DAC) and time-corrected gain (TCG) are not yet part of the practice runtime, so evaluating amplitude against a DAC curve is still learned on real blocks. A screen cannot give you the feel of couplant and probe pressure, the drag of a rough or curved surface, real electronic noise, heat, poor light or an awkward scanning position. Telling a real flaw echo from geometry on a real weld needs real specimens, which is why Atlantis runs practical training in the simulator and then in person at the client's own facility, on real instruments and the client's components.

How UT simulator practice fits SNT-TC-1A

SNT-TC-1A leaves training and experience to the employer's written practice. Its recommended UT figures are 40 training hours for Level I and a further 40 for Level II, with 210 and 630 hours of experience in the method. Organised training may include computer-based or web-based training where the written practice allows it, so a logged UT practical can sit inside the training hours. It is not experience, which means work in the work environment: record simulator time as training unless a certification body has approved otherwise.

Plan what is left with the SNT-TC-1A hours planner and check the theory with the free UT Level II practice questions.

Frequently asked questions

Is the UT simulator the same as the free A-scan tool?

No. The A-scan tool draws one straight-beam A-scan over a flat plate so you can learn gain, range and gates. The Practical NDT UT jobs add the whole procedure: probe choice, couplant, two-reference calibration, gated scanning with a coverage map, angle beams through three legs, the calibration check and the training report.

Can I practise ultrasonic testing for free?

Yes, in part. The free A-scan tool runs in your browser with no sign-up and teaches gain, range and gates on a straight-beam A-scan. The full UT practicals in Practical NDT are shown on request in a demo.

Does the UT simulator include DAC or TCG?

Not yet. Distance-amplitude correction and time-corrected gain are not part of the practice runtime in the current release, and the job brief says so.

Can UT simulator time count as experience hours?

Record it as training. Experience is work performed in the work environment; simulator practice can count as organised training only where your written practice allows it.

Next steps

• Ultrasonic testing training: theory online, practicals in the simulator and at your facility
• UT Level II training
• UT Level II practice questions
• UT angle beam calculator: skip distance, sound path and leg
• Phased array UT simulator
• TOFD simulator
• All NDT practice tests
• Practical NDT overview
• Request a UT simulator demo

Speak to an ASNT NDT Level III

Discuss your inspection requirements with Atlantis NDT. Include the asset, method, location and documents you need reviewed.