AWS CWI Certification 2026 — Requirements, Exam Parts, Career Impact

AWS CWI certification: what it is and how you qualify

AWS CWI certification is the American Welding Society's Certified Welding Inspector credential, run under the AWS QC1 specification. To earn it you need a set combination of education and welding-based work experience, a passed vision test, and at least 72% on each of three exams: Part A Fundamentals, Part B Practical and Part C Code Book. The certification runs on a nine-year cycle, with renewals at years three and six.

A note on who is writing this. Atlantis NDT does not offer CWI training, CWI seminars or CWI exam prep. We train NDT technicians to ASNT SNT-TC-1A. This section is informational, and every exam detail below should be checked against the AWS CWI page on aws.org before you apply. AWS changes editions, rules and fees. If any older guide, including older material on this site, quotes a different exam structure or pass mark, aws.org governs.

CWI requirements: education and work experience

AWS sets the experience you need by your level of education. This table reflects the AWS CWI page as of October 2026, which cites QC1:2016-AMD1 and B5.1:2025.

Three practical points trip people up:

• "Welding-based" has a meaning. AWS defines which kinds of welding-related work count. Read the current definition on the application before you count your years.
• You need documentation. Experience must be supported with documentation, typically from your employers. Gather it before you apply, not after.
• The vision test is a requirement. It is part of qualifying, not a formality. Use the current AWS form.

Not enough experience yet? The Certified Associate Welding Inspector (CAWI) credential has lower experience thresholds. For example, it needs 2 years with a high school diploma, compared with 5 for the CWI. It uses the same three-part exam structure. A CAWI is valid for three years and cannot be renewed or recertified. It is designed as a stepping stone, upgraded to CWI once you meet the experience requirement.

The CWI exam: Part A, Part B and Part C

The exam is three separate parts, and you need a minimum of 72% on each. A strong score in one part does not carry a weak one.

Two rules worth knowing before you book. First, AWS states that candidates must complete all three parts before retaking any part. Second, Part C is tied to a specific code edition. Pick the code that matches the work you do or want to do: structural steel usually means D1.1, cross-country pipelines API 1104, and process and power piping the ASME option. Our AWS D1.1 summary shows what the structural code covers.

Preparing: seminars, courses and self-study

Searches for a "CWI course" or "CWI classes" usually mean exam preparation. AWS runs its own CWI seminars, including in-person seminars tied to exam locations and an online instructor-led format listed on aws.org. Third-party schools also run prep courses. A seminar is optional, not an eligibility requirement. Whichever route you take, three habits help: work through your chosen code book until you can find clauses quickly, practise with the measuring tools a weld inspector uses, and read the Part B Book of Specifications before the practical. Atlantis does not run CWI courses, so check course schedules and formats directly with AWS or the provider.

CWI renewal and recertification

A CWI certification is valid for nine years, with renewals due at years three and six. AWS lists three ways to renew at years three and six:

• By work experience. You confirm no break in practice or employment longer than two years within the prior three years.
• By examination.
• By Part B examination and Part B training.

At year nine you recertify. AWS lists these routes:

• By examination. The Part B Practical exam, or the SCWI Part A and B exams.
• By continuing education. 80 Professional Development Hours in the subject areas AWS defines.
• By credential. Initial Certified Radiographic Interpreter (CRI) certification.
• By endorsement. An endorsement exam taken before the ninth year.

Renewal and recertification fees are set by AWS and published on aws.org. Track your dates. A lapsed welding inspector on a project roster is a finding on the contractor, not only on the individual.

Senior CWI (SCWI). The senior credential needs a CWI held for at least six of the past eight years and a minimum of 15 years of work experience across at least three listed areas. AWS now builds the SCWI from four endorsements: Welder Performance Qualifier, Welding Procedure Qualifier, Welding Coordination and QA, and Nondestructive Examination Coordination.

CWI vs ASNT NDT Level II vs API 510/570: who does what on a project

These credentials are often compared as if they compete. On a real project they sit side by side, each covering a different question.

A worked example. Take a nozzle repair on a refinery pressure vessel. The API 510 inspector and the engineer approve the repair plan. A welding inspector, often a CWI, checks the WPS, the welder's qualification and the visual quality of the weld. An ASNT Level II performs the MT and the RT or UT the plan calls for, to procedures a Level III approved. The API 510 inspector then accepts the NDE results and closes the repair. Nobody in that chain replaces anybody else.

The codes say the same thing. AWS D1.1 lists an AWS CWI certified under QC1 as one accepted basis for inspector qualification. It also accepts CWB certification under CSA W178.2, or an engineer or technician competent by training and experience. For NDT other than visual, codes typically point to personnel qualified under an employer written practice based on ASNT SNT-TC-1A, or to ANSI/ASNT CP-189. A CWI card does not certify you to perform UT or RT. For the wider comparison, read ASNT Level II vs code inspector certification.

Career paths: where each credential leads

Gulf Coast welders usually ask the same question: which credential opens more doors? It depends on the doors. These are the common paths:

• Fabrication QC. Welder to CWI to QC lead to QA manager, with the SCWI later. Common in pressure vessel, structural and module fabrication shops.
• Construction and pipeline inspection. CWI with the code book that matches the work: D1.1 for buildings, D1.5 for bridges, API 1104 for pipelines. Often project-based, with travel.
• Source inspection. Visiting vendors' shops to check welding and documentation for an owner or EPC. The CWI is common here, combined with a reading knowledge of NDT reports.
• NDT technician. ASNT Level II in UT, then PAUT and TOFD, then Level III. This path leads into turnaround work, corrosion programmes and, at Level III, procedure writing and consulting.
• Owner-user inspector. API 510 or 570 after years of welding, NDT or plant experience. A CWI or an ASNT Level II from earlier in a career is useful background here, though not required.

Is the CWI worth it?

It is worth most when your work involves accepting or rejecting welds to a code: fabrication, construction, pipeline spreads and source inspection. It is worth less if your goal is to perform NDT, where an ASNT Level II is the credential that counts, or to run in-service inspection at a refinery, where API 510 or 570 decides who signs. Some inspectors eventually hold two of these. Pick the first one based on the work you want next year, not the title.

Pay depends on region, rotation, per diem and which credentials you combine. We do not quote salary figures in this section. For the Gulf Coast comparison, see code inspector vs CWI salary on the Gulf Coast.

Canada notes

In Canada the equivalent welding inspector credential is CWB Group certification under CSA W178.2. It has three levels. Level 1 needs at least one year of relevant experience or recognised courses. Level 2 needs two years as a certified Level 1. Level 3 needs 48 months as a certified Level 2. For NDT personnel, the national scheme is CAN/CGSB-48.9712. The CGSB closed on 1 April 2026. NRCan's NDT Certification Body continues and issues CAN/CGSB-48.9712 certification. If you work on both sides of the border, check which credential each owner specification names.

Where Atlantis fits: ASNT NDT training as the complementary path

To say it plainly: Atlantis does not offer CWI, AWS, API, CSWIP, PCN or ISO 9712 training or exam prep. What we do offer complements the CWI. We train NDT technicians to ASNT SNT-TC-1A at Level I, II and III, self-paced online or onsite at your facility. There is no physical training centre. We have trained 1,000+ technicians.

• For welders and CWIs adding a method. UT, MT, PT and other methods to Level II, so you can perform the NDT your welds are judged by. See NDT Level II training and ASNT certification pathways.
• For employers. A training plan built around your written practice, with onsite delivery in Texas, Louisiana, California and other states. Fees are on our published US training fees page.
• For QA managers. Tracking CWI renewal dates, NDT certifications and vision exams across a crew is a records problem. Certification tracking in Atlantis ERP flags lapses before dispatch.

Request a training plan for ASNT NDT certification. If your written practice needs writing or auditing first, talk to a Level III.

Frequently asked questions

How much does AWS CWI certification cost?

AWS sets the application, exam, renewal and recertification fees and publishes them on aws.org. Your total also includes the code book for Part C, study materials, travel to the Part B location and any optional seminar. We do not repeat AWS fee figures here because they change.

How long does a CWI certification last?

Nine years, with renewals at years three and six and recertification at year nine. A CAWI lasts three years and cannot be renewed.

What do nationwide inspection contracts require of CWIs?

Read the contract's inspector qualification clause. It typically asks for a current AWS CWI, sometimes a code book that matches the work, and separate ASNT-based method certifications for anyone performing NDT other than visual. Keep renewal and vision records ready for the client audit.

How do I become a certified welding inspector?

Confirm you meet the education and experience table, pass the vision test, gather employer verification of your experience and apply through AWS. Then sit Parts A and C at a Prometric centre and Part B at an AWS location, pass all three, and keep your renewals current.

Is a code-body exam like API 510 harder than the CWI exam?

They test different things. The CWI has a hands-on practical and three separately scored parts. API 510 is one long exam: API lists 170 questions, 140 of them scored, split between closed-book and open-book sections, over a 7.5-hour appointment. Which feels harder depends on your background, not on a general rule.

CWI or ASNT NDT Level II for a journeyman welder on the Gulf Coast?

Choose CWI if you want fabrication, construction or source inspection work. Choose ASNT Level II in UT if you want turnaround and NDT service work. Holding both widens the jobs you can bid for. Request a training plan for the NDT side.

Should we require API 577 for welding QC leads who already hold a CWI?

It depends on the work. API 577 adds refinery welding and metallurgy knowledge, which helps on in-service repairs and alterations. It does not replace the CWI where a construction code names CWI qualification. Whether to require it for every lead is a policy call for your QA manual.

Does Atlantis offer CWI training or exam prep?

No. For AWS seminars, use aws.org. Atlantis offers ASNT SNT-TC-1A NDT training at Level I, II and III, self-paced online or onsite.

What is the difference between a CAWI, a CWI and an SCWI?

A CAWI is the associate credential with lower experience thresholds, valid for three years. A CWI is the full credential on a nine-year cycle. An SCWI is the senior credential, built from four endorsements, for experienced CWIs.

CWI vs API 510 vs API 577: which welding or inspection credential to pursue

Short answer: These three credentials do different jobs. The AWS CWI qualifies you to inspect welding during fabrication and construction against an approved code you choose, such as AWS D1.1 or API 1104. API 510 certifies you to inspect pressure vessels that are already in service, under the API 510 code. API 577 is a knowledge certificate in welding inspection and metallurgy for the petrochemical industry. You do not need a CWI before API 510. A welder with mostly shop or field welding experience usually qualifies for the CWI first.

Inspectors argue about this question all the time, and most of the arguments mix up three separate things: what each credential authorizes you to do, who is eligible to sit for it, and who actually asks for it in a contract. This section takes each one in turn, using the public programme pages of the American Welding Society (AWS) and the American Petroleum Institute's Individual Certification Programs (API ICP), checked in October 2026. Exam formats and eligibility rules come from those bodies. Pass rates are quoted only where API itself publishes them. Where the sections above give different figures, the AWS and API pages cited here are the current primary source. At the end we explain where ASNT NDT certification fits, since that is the credential Atlantis NDT trains for. We do not offer CWI or API training or exam preparation.

What each credential actually certifies

AWS Certified Welding Inspector (CWI). The CWI is issued under AWS QC1, the AWS specification for certifying welding inspectors. AWS's program page currently references QC1:2016-AMD1 and AWS B5.1:2025. It is a fabrication and construction credential. A CWI checks welding procedures, welder qualifications, fit-up, the welding itself and the finished weld against the acceptance criteria of a code. The code book part of the exam is taken on a code you choose, so a CWI has shown working command of that code. Structural steel, bridges, pipelines under construction, shop fabrication and pressure equipment manufacture all use CWIs. On structural work, AWS D1.1 names CWI certification to QC1 as a basis for qualifying the inspector who accepts or rejects work on visual inspection, and it also allows alternatives such as Canadian Welding Bureau certification to CSA W178.2.

API 510 Pressure Vessel Inspector. API 510 is the in-service inspection code for pressure vessels in the refining and chemical industries. The code requires the authorized pressure vessel inspector to meet the education and experience rules in its own annex, and API ICP administers that certification. An API 510 inspector plans and directs in-service inspection, reviews thickness and corrosion data, judges corrosion rates and remaining life, and has a defined role in approving repairs, alterations and rerates under the code. This is an operating-plant credential, and owner-users and their contract inspection companies are the main employers.

API 577 Welding Inspection and Metallurgy. API describes this program as validating expertise in welding and metallurgy for "highly specialized inspectors, welding engineers, metallurgists and other professionals across the entire petrochemical industry." It tests knowledge from API RP 577 and the related publications listed on its effectivity sheet. API 577 does not make you an inspector of record for anything. It is a specialist knowledge certificate, most often added by people who already hold a core API code certificate.

So the first question is not "which is harder?" It is "what work do I want to be signing for?" If you want to be the person accepting welds on new construction, that is CWI territory. If you want to be the person setting the next inspection date on a 30-year-old vessel, that is API 510. If you already work in a refinery and want recognized depth on weld metallurgy, cracking and repair welding, that is API 577.

Eligibility side by side

Eligibility is where many welders get surprised. The rules below come from AWS's CWI program page and API's 510 and 577 program pages. Experience must be documented, and both bodies can audit what you claim.

Two points stand out. First, API 510 always requires inspection experience: at least a year of performing or supervising inspection on most routes. A welder with ten years of welding and no inspection time does not yet qualify, however good the welding was. CWI eligibility counts welding-related work more broadly. AWS lists inspection, testing and quality roles among qualifying experience, and its application asks for supporting documentation. Second, API 577 has a shortcut. Anyone holding a current API 510, 570 or 653 certificate is automatically eligible, which is why 577 is usually a second credential.

For API 510 eligibility details, including what counts as inspection experience, see our API 510 certification overview and API's own API 510 programme page.

Exam format and delivery compared

The three exams are built very differently, which partly explains why people disagree about which is "harder."

The CWI practical (Part B) is the part with no equivalent in the API exams. You handle real gauges and weld replicas and apply acceptance criteria. API 510 instead tests calculation and code navigation: minimum required thickness, corrosion rates, remaining life, inspection intervals, pressure tests, and the ASME Section VIII, Section IX and API recommended-practice content listed in the current body of knowledge. API 577 is closed-book knowledge of welding processes, metallurgy, heat treatment, weld defects and inspection methods. For the full API delivery picture, see API ICP exam delivery after September 2024.

Do you need an AWS CWI before an API 510?

No. API's API 510 eligibility table lists education and pressure-vessel or inspection experience. It does not list a CWI or any other certificate as a prerequisite. A CWI does not substitute for the API 510 experience requirement either. What usually happens in practice is a sequence, not a prerequisite. A welder moves into fabrication QC as a CWI and then into a plant or a contract inspection company doing in-service work. After a year or more of real inspection on vessels, that person qualifies for API 510.

The reverse question also comes up: can a welder go straight at the pressure vessel certificate? Only if they already have the required pressure-vessel experience, including at least a year in inspection. For most welders who have only welded, the honest answer is that they cannot sit API 510 yet. The CWI, or entry-level inspection work under an experienced inspector, is how they earn that year.

Is a code-body exam harder than the AWS CWI? What the published numbers show

Shop talk says the API exams are harder. Some of the data can be checked. API publishes per-window pass rates for all candidates in its ICP status reports. In the report as of 30 April 2025, API 510 windows from January 2020 to January 2025 ranged from 53.8 percent to 69.2 percent. The most recent four windows were 69.2 (January 2024), 68.5 (May 2024), 65.9 (September 2024) and 66.9 percent (January 2025). API 577 windows in the same report ranged mostly between about 50 and 73 percent, with 68.5 percent in December 2024. These figures cover all candidates in a window and do not separate first attempts from retakes.

We could not find a current, official AWS publication of CWI pass rates to set beside these, so we will not quote one. Any comparison you read that gives a precise CWI pass rate should name its source. The reasonable conclusion from the structure is this. The CWI demands breadth plus a hands-on practical and a 72 percent minimum on every part in the same sitting. API 510 demands calculation-heavy code work over a 7.5-hour day. Each is hard in its own way, and the best predictor of passing either one is whether the candidate's daily work already matches the exam content.

For whether API 510 pays back for a sponsor, see is API 510 worth it in 2026.

Which carries more weight on the hiring side in oil and gas?

It depends on which part of oil and gas. Credentials get their weight from the codes and contracts that call for them. Here is the general pattern. Individual contracts and jurisdictions vary, so always read the actual scope.

• New construction and fabrication (pressure vessel shops, pipe spools, structural steel, modules, pipeline construction): welding inspection is the core activity, and CWI is the credential most often named for weld inspection and QC. Pipeline construction also has its own API credential, API 1169.
• Operating refineries, chemical plants and terminals (turnarounds, on-stream inspection, mechanical-integrity programs): the in-service codes API 510, 570 and 653 govern. A vessel inspection program run under API 510 needs an API 510 certified inspector to act as the authorized inspector. A CWI cannot fill that role. OSHA's process safety management standard requires inspection and testing to follow recognized and generally accepted good engineering practices, and API 510, 570 and 653 are widely used for that purpose.

For a mid-sized contracting company asking about return on investment, the deciding factor is the bid documents you actually receive. If your RFPs specify CWI-qualified weld inspection on fabrication scopes, the CWI is what wins work. If you are pursuing in-service inspection scopes at operating facilities, the owner will expect API-certified inspectors for 510, 570 or 653 work, and no CWI will meet that requirement. Operator acceptance follows the code that governs the equipment. For how owner-users use API certifications, see our API inspector guide.

Salary: code inspectors vs CWIs on the Gulf Coast

No authoritative public dataset splits pay for API 510 or 570 inspectors from CWI pay by region, base rate and per diem. Federal wage statistics use broad occupational categories, and per diem is set contract by contract, so this section gives no figures. Treat any precise-looking salary table, including generic ones, as an estimate unless it names its survey and date. The structural pattern is that turnaround-driven in-service work often carries travel and per diem, multi-code inspectors can be staffed on more scopes, and fabrication-side CWI work tends to be steadier and closer to home. See code inspector vs CWI pay on the Gulf Coast, and verify current offers directly with employers.

Upkeep over a career: renewal rules compared

Entry fees are published by AWS and API and change from year to year, so check aws.org and api.org rather than any figure repeated in a guide. Over a career, the renewal rules matter more than the entry cost. AWS issues the CWI as a nine-year certification, with renewal applications at years three and six. Renewal applicants must confirm they have had no break in employment of more than two years in the prior three years. At year nine, AWS requires recertification, either by retaking the Part B practical or by documented continuing education. AWS also lets a CWI who becomes a Certified Radiographic Interpreter during the nine years use that to meet the nine-year requirement.

API certifications run three-year terms. For API 510, 570 and 653, recertification requires at least 20 percent of working time over the cycle spent performing or supervising inspection under that code, 24 hours of continuing professional development (CPD), and an online open-book quiz every six years. API 577 is also a three-year credential. Two API CPD details catch people out. API's inspector recertification document (revised September 2025) accepts only CPD with verifiable instructional contact time or CEUs. API's CPD guidance also does not accept activities related to maintaining an ASNT SNT-TC-1A certification, so NDT refresher hours should not be counted on to renew an API certificate. Relevant hours from other certification schemes, such as a CWI nine-year recertification course, can be considered.

The practical difference: CWI renewals check that you are still in welding work. API recertification checks that you are still inspecting under that code. A CWI who moves into refinery inspection keeps the CWI current fairly easily. An API 510 holder who moves into new-build fabrication may struggle to show 20 percent of time on in-service vessel inspection.

Which to pursue first: a decision guide

• Welder, no inspection experience, wants to move into inspection: CWI is the usual first credential, or AWS's Certified Associate Welding Inspector (CAWI) if you are short of CWI experience. API 577 is open to you only on its experience routes. API 510 is not available yet.
• Fabrication QC inspector, wants refinery work: get a year of in-service inspection exposure, then API 510 or API 570, depending on whether your plant work is mostly vessels or piping. See API 510 vs 570 vs 653: which first.
• Plant inspector already holding API 510 or 570: API 577 is a natural add-on for repair welding and cracking mechanisms, and you are automatically eligible. Some inspectors add a CWI for weld-heavy turnarounds.
• Anyone performing the NDT itself (UT thickness, PAUT, MT, PT, RT): neither CWI nor API makes you a qualified NDT technician. That is employer certification to ASNT SNT-TC-1A or an equivalent scheme. See ASNT certification paths.

Canada note: In Canada, CWB certification to CSA W178.2 is the domestic welding-inspector scheme. For in-service pressure equipment in Alberta, ABSA's AB-526 requires a current API 510 certificate (or an API 510 exam pass within the last five years) for the vessels-and-piping In-Service Pressure Equipment Inspector certificate. API 570 serves the same purpose for the piping-only certificate. ABSA then sets its own exam.

How Atlantis fits in

Atlantis NDT does not provide AWS CWI, API 510 or API 577 training or exam preparation. For those, go to AWS or API ICP directly. We work alongside the people who hold them. On in-service equipment we perform the NDE that API 510, 570 and 653 programs call for, using ASNT-certified technicians under ASNT Level III oversight, and we report results to the owner's API-certified inspector, who remains inspector of record (see API 510 NDE support). For welders and inspectors who want the hands-on NDT credential that sits next to a CWI or API certificate, we train to ASNT SNT-TC-1A: ASNT certification paths, NDT Level II training and ASNT Level III. More than 1,000 technicians have been trained. Ask about an ASNT NDT path that fits your welding background. We send a quote.

Quick answers: CWI, API 510 and API 577

AWS CWI vs a code welding inspector cert like API 577: which gives better ROI for a mid-sized contractor?

Look at your bid documents. Fabrication and construction scopes most often name CWI-qualified weld inspection. API 577 is a knowledge credential valued inside refining and petrochemical work, usually alongside API 510 or 570. If most of your revenue is new-build welding, CWI is the more useful credential. If it is plant maintenance and turnaround work, API code certifications matter more.

Between an API 510 and an AWS CWI, which carries more weight on the hiring side in oil and gas?

For in-service pressure vessel inspection at operating plants, API 510, because the code requires an API-certified authorized inspector and a CWI cannot substitute. For fabrication and construction weld inspection, CWI. Many senior inspectors hold both.

Is a code-body exam like API 510 actually harder than the AWS CWI exam?

They are hard in different ways. API 510 is a 7.5-hour, calculation-heavy exam on code navigation. API's published per-window pass rates were 65.9 to 69.2 percent across 2024 and early 2025. The CWI has three parts, including a hands-on practical, with a 72 percent minimum on each. We found no official current CWI pass-rate publication to compare against.

For a welder moving into inspection, should I chase AWS CWI first or jump to API 577?

CWI first in most cases. It is built for people coming from welding, it includes a practical, and fabrication employers ask for it by name. API 577 is most valuable once you are working in refining or petrochemical inspection, and API 510, 570 and 653 holders are automatically eligible for it.

Does a CWI or API 510 let me perform UT or RT?

No. Performing NDT requires NDT personnel qualification, such as employer certification to ASNT SNT-TC-1A. Radiography also requires radiation-safety licensing where the work is done.

Building an inspection crew that mixes CWIs, API inspectors and NDT technicians? Plan ASNT Level II training for your technicians, or request NDE support for your API inspector.

Sources for this section: AWS Certified Welding Inspector program page; API ICP API 510 and API 577 program pages; API ICP Schedules and Fees; API ICP Status Update as of 30 April 2025; ABSA AB-526 Edition 3 Revision 3. Verified 4 October 2026. Confirm current fees and eligibility with AWS and API before applying.