NDT Training USA
NDT training for teams and technicians in the USA, scoped to the method, level, experience and qualification scheme required by the employer or client. Discuss classroom, online and onsite delivery, eligibility evidence and examination responsibilities before booking. Request a training pathway consultation.
Self-paced online NDT training to ASNT SNT-TC-1A, open to candidates worldwide. Start any time.
Local price for your country, pay with your local card, and course access opens automatically.
Related inspection services
Connect training records with Level III consulting, inspection management software and digital twin workflows where these support your project. Scope each service against the actual requirements.
Confirm the governing qualification requirements
Identify the employer written practice, contract specifications and relevant adopted standards. Training is one part of qualification; the responsible employer or independent certification body determines the applicable certification requirements.
Confirm delivery and availability
Discuss your location, methods, levels and preferred delivery format. Dates, facilities, equipment and travel arrangements are confirmed during scoping. Request a consultation for a proposal tailored to the project.
In more detail
NDT training in the USA is built around SNT-TC-1A, an employer-administered written-practice system rather than a portable personal certification. Atlantis NDT designs and delivers Level I/II/III training and written-practice documentation for UT, RT, MT, PT, VT, ET, and phased array, aligned to the corridor-specific code requirements of Gulf Coast refining, Permian/Rockies pipeline, Midwest fabrication, and Pacific aerospace employers.
Most technicians entering the US market assume NDT certification works like a driver's license — earn it once, use it everywhere. It doesn't. Under SNT-TC-1A, each employer writes its own qualification and certification program, referencing SNT-TC-1A's recommended training hours, experience hours, and exam structure, then administers and signs the certification itself. That means the same technician can hold a valid Level II UT certification at one company and need to re-qualify at the next, even performing identical work. ANSI/ASNT CP-189 offers a more rigorous, ANSI-accredited alternative many larger employers adopt instead of writing entirely from the recommended-practice document, while ISO 9712 introduces a genuinely different model: independent third-party certification bodies issue personal certifications that travel with the technician. Understanding which model a given contract, client, or corridor expects, and building the paperwork to match, is the actual work of US NDT training, not just the classroom hours.
SNT-TC-1A, CP-189, and ISO 9712: Three Different Certification Models
SNT-TC-1A is not a certification and was never intended to be one — it is an ASNT recommended practice, a guideline document that tells an employer how to structure its own NDT personnel qualification and certification program. The employer's written practice is the actual governing document: it defines which methods are covered, the minimum training and experience hours for Level I, II, and III at each method, the structure of general, specific, and practical examinations, and the vision testing requirements, including near-vision checks annually and color perception at initial qualification and periodically thereafter. Two employers can both claim SNT-TC-1A compliance while running written practices with meaningfully different rigor, because SNT-TC-1A sets recommended minimums, not mandatory pass/fail rules. This is why a Level II certification issued by one company is not automatically honored by the next — the receiving employer has no obligation to accept another company's written practice, only its own.
ANSI/ASNT CP-189 sits a step above SNT-TC-1A in formality: it is an actual ANSI-accredited national consensus standard, not a recommended practice, and employers who adopt it are certifying against a document with the same standing as other ANSI standards referenced in code. It still follows the employer-based model — training hours, experience hours, exams, and sign-off happen inside the company — but the document itself carries more legal and audit weight than a company-authored write-up of SNT-TC-1A. ISO 9712 breaks from both: certification is issued by an independent, accredited certification body after a standardized exam, is tied to the individual rather than the employer, and remains valid when the technician changes companies. International contracts, export-oriented fabrication, and aerospace work increasingly specify ISO 9712 for exactly that portability; domestic refining, petrochemical, and pipeline work in the US still runs predominantly on SNT-TC-1A or CP-189 written practices. See our ASNT certification overview for how these models map to real employer programs.
For a technician, this employer-based structure has a practical consequence that surprises a lot of newcomers to the US market: a strong resume and a certification card from a previous employer will get an interview, but it will not skip the new employer's own qualification process. Reputable US employers verify certification records rather than accept documentation at face value, which means the underlying training and experience hours, not just the certificate, are what actually carry weight when moving between companies or corridors.
Where NDT Demand Concentrates Across US Industrial Corridors
NDT hiring in the US is not evenly distributed. It clusters tightly around four industrial corridors, and each one leans on a different mix of methods. The Gulf Coast, running from Houston through Beaumont/Port Arthur, Baton Rouge, and Lake Charles, carries the country's highest concentration of refining, petrochemical, and LNG capacity, and demand there spikes hard around planned turnaround (TAR) season. Corrosion mapping and weld inspection on pressure vessels and piping dominate — conventional and phased array UT, RT, MT, and PT all see steady work. Ship channel and coastal refining complexes in particular run dense concentrations of piping and vessel inspection scopes, and many companies staff up seasonally rather than carrying a full turnaround crew year-round.
The Rockies and Permian Basin corridor is upstream- and midstream-heavy: pipeline construction and integrity inspection, tubular goods, and wellhead equipment drive demand for UT thickness surveys, MT on tubulars and connections, RT and phased array UT on pipeline girth welds, and corrosion-under-insulation surveys as fields mature. Crews here tend to be smaller and more mobile than Gulf Coast turnaround teams, and technicians often need to be comfortable working remote pad and right-of-way locations rather than a fixed plant site.
The Great Lakes and Midwest corridor runs on fabrication rather than process plants — structural steel, rail car manufacturing, and heavy equipment fabrication shops need MT and PT on castings and welds plus UT weld inspection to AWS D1.1, largely feeding ASME Section VIII pressure vessel and structural fabrication work. The Pacific corridor is different again: aerospace and marine dominate, eddy current testing sees far more use than in the other three corridors, and ISO 9712 or NAS410-aligned certification shows up more often because of aerospace supply chain requirements. Our phased array training and ultrasonic testing programs are built to flex across these method mixes rather than assuming one corridor's demand profile.
Building a Compliant Written Practice: What Actually Goes Into the Document
A written practice is a real, auditable document, not a policy statement. It has to specify, method by method, the minimum initial training hours and on-the-job experience hours required to sit for Level I and Level II exams, the structure of the general exam covering method fundamentals, the specific exam covering the employer's own procedures, and the practical exam requiring hands-on demonstration, plus the vision testing schedule and the interval for recertification. Level I technicians work under Level II or III direction and don't independently interpret results against acceptance criteria; Level II technicians calibrate equipment, conduct and interpret tests against code, and can direct Level I work; Level III holds ultimate technical responsibility — establishing techniques, interpreting codes and specifications, and approving the written practice itself. In most companies the Level III is either an in-house hire or a contracted signatory, since not every employer keeps one on staff full time.
Recertification cycles are set by the employer's own written practice, not fixed by SNT-TC-1A, though three-to-five-year intervals are the common convention. Recertification without a full re-exam is typically allowed where the technician has continued satisfactory job performance and no interruption in the specific method; a full re-exam is more common after an extended gap or a documented performance issue. Getting this document right, and keeping the underlying training and experience records defensible, is most of what corporate NDT training engagements with Atlantis actually build, alongside the classroom and hands-on hours.
What a Client Actually Checks Before Accepting a Technician on Site
An EPC, a refinery QA department, or a fabrication shop bringing in outside technicians rarely takes a certification card at face value. They ask for the certification record itself — training hours, experience hours, and exam scores tied to the specific method and level claimed — along with proof of a current vision exam, since an expired annual vision test invalidates the certification regardless of when the written or practical exam was passed. They also check whether the issuing written practice is SNT-TC-1A-based, CP-189-based, or ISO 9712-based, because some owner-user inspection programs and some client specifications explicitly require one model over another.
For welding-code-governed work, clients also want to see that the technician's certification lines up with the applicable code edition — ASME Section V, AWS D1.1, and API in-service inspection codes each reference personnel qualification slightly differently, and a certification that's technically valid under one framework can still be rejected if it doesn't match what the governing contract specifies. Larger clients increasingly ask for a Level III opinion letter confirming the written practice and the individual's qualification, particularly for phased array and other advanced UT techniques where the practical exam content varies more between employers than it does for conventional methods. That extra layer of verification has become more common as clients get burned by written practices that technically comply with SNT-TC-1A's minimums but don't hold up to real scrutiny. Our NDT methods overview breaks down which certifications typically map to which inspection scopes.
Is SNT-TC-1A itself a certification I can earn?
No. SNT-TC-1A is an ASNT recommended practice — a guideline an employer uses to write its own certification program. The certification comes from the employer's written practice, not from SNT-TC-1A directly.
Can I transfer my NDT certification to a new employer?
Not automatically under the SNT-TC-1A model. A new employer is not obligated to honor another company's written practice and typically re-certifies you under its own, though documented training and experience hours can usually be credited toward the new qualification.
Do US employers require SNT-TC-1A or ISO 9712?
It depends on the client and contract. Domestic refining, petrochemical, and pipeline work in the US runs predominantly on SNT-TC-1A or CP-189 written practices; export, international, and aerospace-linked work increasingly specifies ISO 9712 for its portability.
What is the difference between CP-189 and SNT-TC-1A?
CP-189 is an ANSI-accredited national consensus standard; SNT-TC-1A is a recommended practice, not a formal standard. Both follow the employer-based certification model, but CP-189 carries more formal, auditable weight.
How often does NDT certification need to be renewed?
The employer's written practice sets the interval — commonly every three to five years — plus an annual vision exam that must stay current regardless of the recertification cycle.
Which US region has the strongest NDT job demand?
The Gulf Coast corridor, from Houston through Beaumont/Port Arthur, Baton Rouge, and Lake Charles, carries the country's densest concentration of refining, petrochemical, and LNG inspection demand, with sharp seasonal spikes around turnaround season.
NDT training and certification program in the USA: how it works
In the USA, an NDT training and certification program is run by the employer. The employer adopts ASNT SNT-TC-1A through its own written practice. Technicians complete classroom training, log on-the-job experience and pass general, specific and practical examinations set under a Level III. Then the employer certifies them. A training provider supplies the training hours. It does not issue the certification. The certificate belongs to the employer's program.
This section is for the people who run that program: operations managers, QA/QC leads and training managers. It covers how to set the program up, what a training plan should contain, how to handle experienced hires, nationwide contracts and aerospace work, and the mistakes that show up at audit. For how enrolment works and published fees, see the US course list and published fees. To get a plan for your own crew, request a training plan.
Setting up an employer NDT program, stage by stage
Most companies that ask for "NDT training" actually need a program, not a course. The course is one stage. The order of the stages matters, because each one produces evidence the next one depends on.
| Stage | What happens | Who owns it | What sets the pace |
|---|---|---|---|
| 1. Scope | List every method and technique you sell or use, and the level each person needs | Employer | Your contracts and client specs |
| 2. Written practice | Adopt SNT-TC-1A, or CP-189 if a client requires it, as your own controlled document | Employer, approved by its Level III | Number of methods and client requirements |
| 3. Training | Classroom and practical hours per method and level, as the written practice sets | Training provider, in-house or contracted | Scheduling around shifts and jobs |
| 4. Experience | On-the-job hours per method, logged and signed | Employer and its Level IIs | Real work. This stage cannot be compressed |
| 5. Examinations | General, specific and practical, graded and filed | Level III, in-house or outsourced | Candidates' readiness and examiner availability |
| 6. Certification | Employer issues the certificate for method and level | Employer | Complete files for each person |
| 7. Maintenance | Vision checks, recertification, new methods, written practice revisions | Employer and Level III | Due dates in the written practice |
Two points catch new programs out. First, stage 2 comes before stage 3. Training delivered before the written practice exists may not match the hours and content the document later sets. Second, stage 4 sets the calendar. You can run classroom training in a week. You cannot collect months of supervised UT experience in a week. Plan the start dates of your trainees around when you need them certified, not around when the course runs.
If you do not have a Level III to approve the written practice and run the examinations, that is a consulting job rather than a training one. See ASNT Level III consulting services.
What a training plan from Atlantis contains
A training plan turns your written practice into a schedule for named people. It is the document we send back when you request one, and it is built from your crew list, not from our course catalog.
| Part of the plan | What it contains | Why it matters at audit |
|---|---|---|
| Crew matrix | Each person, the methods and levels they need, and what evidence they already hold | Shows the program covers every method you put your name to |
| Gap list | Hours still owed per person, per method, against your written practice | Stops anyone being certified on hours they never completed |
| Delivery schedule | Self-paced online theory sessions and onsite practical blocks, set around your shifts | Keeps crews on the tools while training is completed |
| Practical content | Exercises on specimens and geometries that match your actual work | Practical examinations are easier to defend when training matched the work |
| Training records | Attendance, hours, topics and dates per person, per method and level | The first thing an auditor samples in a certification file |
| Examination plan | Which examinations follow, and who administers them under your written practice | Separates training from examination, as SNT-TC-1A expects |
| Maintenance calendar | Vision check and recertification dates for everyone on the matrix | Lapsed vision and expired certificates are the easiest findings to avoid |
We deliver Level I, II and III training to ASNT SNT-TC-1A, self-paced online or onsite at your facility. There is no physical training centre. Practical blocks run on your equipment wherever possible, because that is the equipment your technicians will be examined and certified on. Between sessions, trainees can practise setups on Practical NDT, our 3D skills simulator. It supports practice. It does not replace hands-on hours or the practical examination.
Hiring a technician certified somewhere else
Under SNT-TC-1A, a certificate from a previous employer belongs to that employer's program. Your company is not obliged to accept it. But you do not have to start the person from zero either. The written practice should state how prior training and experience are credited. In practice, a careful employer does this:
- Get the records, not just the card. Ask for the training hours with dates and source, the experience log and the examination grades from the previous employer.
- Verify them. Contact the previous employer or its Level III. Records that cannot be verified should not be credited.
- Credit what matches. Training and experience that meet your written practice for the same method and level can be credited. Hours for a different technique, such as conventional UT counted toward PAUT, should not be.
- Examine on your work. Most employers at least set their own specific and practical examinations, because those test your procedures and your equipment.
- Check vision. Run a vision examination at hire, whatever the old file says.
- Certify and file. Issue your own certificate, and keep the evidence for each credited item in the file.
This is often the fastest route to adding certified people. It is also where weak programs get caught, because a credited hour with no record behind it is still an uncredited hour to an auditor.
Nationwide contracts and multi-state crews
There is no state NDT licence for UT, MT, PT, VT or ET technicians. An SNT-TC-1A certification issued by your company is valid wherever your company works, because it is your program. That is why one written practice can cover crews in Texas, Louisiana, California and anywhere else. What changes on a nationwide contract is the client's checking, not the certificate.
- One written practice, applied the same way everywhere. Crews at different sites should be trained, examined and filed to the same document. Different branches running their own versions is a common finding on multi-site audits.
- Client acceptance. National operators and EPCs often review your written practice and a sample of files before approving you for all their sites. Some specify CP-189 instead of SNT-TC-1A. Check the contract before you mobilise.
- Subcontracted crews. If a subcontractor supplies technicians, they work under the subcontractor's certification, not yours. The prime contractor should check those records before they arrive on site.
- Radiography is different. Industrial radiographers also need radiation safety certification under NRC rules or the rules of the Agreement State where they work. That layer is separate from SNT-TC-1A and has to be checked state by state.
- Records available from anywhere. A client at a site in one state should be able to see a technician's current certification without waiting for a file from head office.
For more on how national clients check certifications, read NDT certification on nationwide US contracts. Our state hubs cover local delivery and industries: Texas, Louisiana, Oklahoma, California and Pennsylvania.
Crews crossing into Canada. Canada mostly certifies NDT personnel as individuals, not through employer programs. The CGSB closed on 1 April 2026. Natural Resources Canada's NDT Certification Body continues and issues certification to CAN/CGSB-48.9712. A US crew sent to a Canadian site may need that certification, depending on the owner and the jurisdiction. See NDT training in Canada.
Aerospace work and NAS 410: where SNT-TC-1A training stops
Searches for aerospace NDT courses and NAS 410 training usually come from people who expect one course to cover both. It does not. US aerospace suppliers qualify NDT personnel to NAS 410, set by the aerospace industry and enforced by the primes and through Nadcap audits. Like SNT-TC-1A it is employer-based, but its requirements are mandatory rather than recommended, and it has its own rules for the Responsible Level 3, training hours and examinations.
Atlantis trains to ASNT SNT-TC-1A only. We do not offer NAS 410 training or certification. If you work in aerospace:
- Ask your Responsible Level 3 or your prime what training they accept toward NAS 410 before you book anything.
- Do not assume SNT-TC-1A hours will be credited. That decision belongs to your aerospace employer's program.
- If your company does both industrial and aerospace work, keep two clearly separate certification tracks. Mixing them in one written practice causes findings on both sides.
Many companies in California, Washington and the Gulf Coast do industrial work under SNT-TC-1A alongside aerospace work. For the industrial side, a training plan works as described on this page.
If you are looking for NDT certification as an individual
Many searches for "NDT certification near me" or "NDT classes" come from people without an employer yet. Here is how it works in the US.
- Classroom training you can do now. You can complete classroom hours for Level I and Level II before you are hired. With us that is self-paced online, so location does not matter. Keep the attendance records. A future employer will want them.
- Experience and certification come with a job. Under SNT-TC-1A, you log experience hours and take the employer's examinations once you are working. The employer then certifies you. No school can do this part for you.
- Third-party routes exist. ASNT's central certification programs and ISO 9712 certification bodies issue certificates to individuals. They are useful, but many US employers still certify you under their own written practice as well.
- Level III candidates. If you are aiming for Level III, the usual route is ASNT's Level III examinations, then certification by your employer. We run Level III training led by an ASNT Level III. Our founder, Anoop Rayavarapu, is one.
Atlantis has trained 1,000+ technicians, most of them sent by their employers. If you are an employer building a crew, request a training plan and send your crew list.
How to compare NDT training providers
Training managers usually compare providers on dates and cost. Both matter, but neither tells you whether the hours will stand up when an auditor opens a certification file. These questions do.
| Question to ask | A good answer | A warning sign |
|---|---|---|
| Which scheme do you train to? | A clear answer, for example SNT-TC-1A only, with the levels and methods listed | "All schemes", or a promise that one course covers SNT-TC-1A, NAS 410 and ISO 9712 |
| Will the course match our written practice? | They ask to see it, then map hours and topics to it | They never ask what your written practice says |
| What records do we get? | Attendance, actual instruction hours, topics and dates per person, method and level | A single completion certificate per person |
| Who teaches? | A named instructor whose method qualifications you can check | "Our certified team" |
| How is the practical done? | On your equipment or specimens that match your work | A generic demonstration nobody touches |
| Do you issue certification? | No. The employer certifies under its written practice | "Certified in five days", or a wallet card issued by the school |
| Can you work around our shifts? | Split cohorts, theory online, practical blocks onsite | One fixed public date, take it or leave it |
The answer to "do you issue certification?" is the most useful filter. Under SNT-TC-1A, a provider who says yes is either running a third-party scheme, which is a different thing, or is telling you something your auditor will not accept.
Ask for a sample training record before you book. If it would not survive a client's file review, the course will not either, however good the teaching is. And check who will hold the records afterwards. They belong in your files, not only on the provider's system.
Common mistakes employers make with NDT training
- Buying a course before writing the program. The training then has to be checked against a written practice written afterwards. Sometimes it does not fit.
- Treating a course certificate as certification. A course certificate proves training hours. The employer certifies, after experience and examinations.
- Letting the trainer also be the only examiner, with no separation. SNT-TC-1A expects examinations controlled by a Level III. Keep training records and examination records separate in the file.
- Generic practicals. A crew that inspects pipe welds should practise on pipe welds. Flat plates prove little.
- Counting hours by the calendar. A week-long course is not 40 hours of training if half of it was paperwork and breaks. Log actual instruction time.
- Missing the maintenance stage. Vision checks and recertification lapse quietly. Put the dates in a system that warns you in advance.
- Training on equipment the crew will never use. Practical skill transfers best on the instruments and probes in your own cabinet.
Frequently asked questions
What is an NDT program?
An NDT program is the employer's system for training, examining, certifying and recertifying its NDT personnel. In the US it is usually built on ASNT SNT-TC-1A and written down in the employer's written practice, which a Level III approves.
Is there ASNT training near me?
Atlantis has no physical training centre. Theory runs self-paced online, so it is available anywhere in the US, and practical blocks run onsite at the employer's facility. Our state pages explain local delivery.
Is SNT-TC-1A training the same as SNT-TC-1A certification?
No. Training supplies the classroom and practical hours. Certification is issued by the employer after experience hours and examinations under its written practice.
Do you offer NAS 410 or aerospace NDT certification training?
No. Atlantis trains to ASNT SNT-TC-1A only. Aerospace suppliers qualify personnel to NAS 410, and your Responsible Level 3 decides what training it accepts.
Does ASNT certification work on nationwide contracts?
An employer's SNT-TC-1A certification is valid wherever that employer works, since there is no state licence for most NDT methods. National clients still review your written practice and technician files, and radiography adds state or NRC radiation safety requirements.
Can I get NDT certification online?
You can complete classroom training online. Certification under SNT-TC-1A also needs logged experience and examinations, including a hands-on practical, and is issued by your employer.
How long does it take to certify a new technician?
Classroom training takes days or weeks. Experience hours take longer and set the timeline, so the total is usually measured in months for Level II. Your written practice sets the minimums.
Can you deliver training onsite at our plant or shop?
Yes. Onsite delivery at the employer is one of our two delivery modes, the other being self-paced online. Most employers combine them: theory online around the shift pattern, practical blocks onsite on their own equipment and specimens.
Do you train candidates for ASNT Level III?
Yes. Level III training is led by an ASNT NDT Level III. ASNT runs the Level III examinations themselves, and your employer then certifies you as its Level III under its written practice.
Where can I see how enrolment works and the fees?
The US course list and published fees page lists courses by method and level. This page covers how the employer-based program around those courses works. The training hub lists all programs.
To turn your written practice and crew list into a schedule, request a training plan.
Practise between sessions
Free practice tests and downloadable question packs show where you stand, and Practical NDT lets you practise scans on a 3D simulator before the practical examination.
Start NDT training any time of year
Enrolment is open throughout the year. Courses are primarily self-paced, so you can join at any time and work through the learning material around your schedule.
- Monthly starts
- Portal access opens the moment you enrol, at any time of year.
- Level III support
- Level III support is available throughout the year for course clarifications. Confirm the contact method and arrangements when you enrol.
- Practical arrangements
- Practicals are done in the Practical NDT simulator and in person at your employer’s facility, on its equipment and parts. Simulator practice supports training; it does not replace supervised experience, the practical examination or employer certification.
NDT training fees — United States
Published fees for ASNT SNT-TC-1A Level I and Level II training in the United States, and for the online Level III refresher. All fees are in US dollars.
| Package | Training hours | Package fee |
|---|---|---|
| Level I — all 5 methods | 104 hours | $2,799 |
| Level II — all 5 methods | 112 hours | $2,799 |
| Method | Fee per method |
|---|---|
| Visual Testing (VT) | $349 |
| Penetrant Testing (PT) | $399 |
| Magnetic Particle Testing (MT) | $399 |
| Ultrasonic Testing (UT) | $799 |
| Radiographic Testing (RT) | $899 |
| Level III refresher | Fee per method |
|---|---|
| Basic (general examination) | $1,260 |
| Ultrasonic Testing (UT) | $1,260 |
| Radiographic Testing (RT) | $1,260 |
| Magnetic Particle Testing (MT) | $900 |
| Liquid Penetrant Testing (PT) | $900 |
| Visual Testing (VT) | $900 |
The Atlantis course page shows the price for your country. Pay with your local card and your course access opens automatically.
- Level I and Level II: materials and exam preparation are included. Training hours follow the recommended initial hours in ASNT SNT-TC-1A Table 6.3.1A; final hours are set by the employer's written practice.
- Payment: 50% in advance to start training, with the 50% balance due before the certificate is issued. Applicable taxes may apply.
- Level III refresher: fees cover online course access, study materials, mock exams and instructor support. ASNT examination fees are paid separately to ASNT and are not included.
- Fees are subject to change. Group and corporate programmes are quoted on request.
Published fees for other regions: Middle East, Europe, South East Asia. Training outside the United States, the Middle East, Europe and South East Asia (including Canada, Australia, New Zealand and Africa)? Contact us for fees in your region.
Plan training around your employer’s written practice
Start with the NDT method, the level of responsibility and the governing employer written practice. Training completion, documented experience, vision requirements and examinations are separate parts of an employer-based certification programme. Course attendance alone does not authorize someone to inspect on an employer’s behalf.
For US enquiries, tell us your state, method, intended level, prior training and experience, and whether your employer needs onsite delivery. Confirm the applicable SNT-TC-1A or CP-189 edition and any customer or aerospace requirements before agreeing the syllabus. Duration and delivery are scoped to those requirements; there is no universal short course or guaranteed pass rate.
Explore ultrasonic testing training · Get written-practice and Level III support · Discuss US training requirements
Certification background: ASNT’s explanation of employer-based certification.
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