AWS D1.1 Compliance for Inspection Service Providers
Contractors, fabricators and inspection firms working to AWS D1.1 on welded structures made from the commonly used carbon and low-alloy constructional steels — structural steel buildings, plate girders, tubular structures, stud welding, and strengthening and repair of existing structures. Personnel are qualified under employer-based certification, so a contracted Level III can sign the written practice and administer examinations for the firm.
It binds whoever the contract documents make responsible for inspection, which in practice splits between the Contractor's Inspector and the Owner's Verification Inspector. D1.1 is a code, not a certification scheme — nobody issues a D1.1 certificate to a company. What it does is dictate who may inspect, how NDT must be procedured, and what constitutes acceptance. Clause 8 is the inspection clause and runs in seven parts: general requirements, contractor obligations, acceptance criteria, NDT procedures, radiographic testing, ultrasonic testing of groove welds, and other examination methods including radiation imaging systems and advanced ultrasonic systems. The 2025 edition rewrote how NDT personnel certification is established, added definitions splitting MT and PT indications into linear and rounded, and updated the Table 8.1 visual acceptance criteria for undercut and piping porosity.
Source: AWS D1.1/D1.1M:2025, Structural Welding Code — Steel, 25th edition, ANSI-approved 19 March 2025, revising D1.1/D1.1M:2020 — front matter, Summary of Changes and the complete Clause 8 and Clause 10 tables of contents read from the AWS-published preview at pubs.aws.org. Clause-level detail for 8.10.1, 8.14.6, 8.14.6.2, 8.14.6.3 and 10.29.1 taken verbatim from the AWS Welding Journal article "What's New in AWS D1.1 2025, Structural Welding Code — Steel" published by AWS/FABTECH. Current designation D1.1/D1.1M:2025-AMD1 confirmed on aws.org. AWS QC1:2016, Standard for AWS Certification of Welding Inspectors, read in full (clauses 8.1 visual acuity, 10.1 certification validity, 15 renewals, 16 nine-year recertification). ASNT standard editions confirmed on asnt.org: SNT-TC-1A (2024), ANSI/ASNT CP-189 (2024) and ANSI/ASNT CP-105 (2024) as employer-based, ANSI/ASNT CP-9712 (2023) as the US adoption of ISO 9712:2021 and third-party. Verified August 2026. The full body text of Clause 8 sits behind AWS's paywall and was not read line by line.
| Item | What applies | Why it matters |
|---|---|---|
| Authority | American Welding Society (AWS), D1 Committee on Structural Welding; an ANSI-approved American National Standard. Welding inspector certification is administered by the AWS Certification Committee under AWS QC1. Enforcement is by the Engineer and Owner through the contract documents, and carries statutory force wherever a governmental body incorporates the code into law or regulation. | The body that issues, audits and can withdraw |
| Applies to | Contractors, fabricators and inspection firms working to AWS D1. | Whether this binds your firm at all |
| Personnel certification | Employer-based — the firm certifies its own, under a qualified Level III | Decides whether an outsourced Level III can sign for you |
| Renewal | The code is reissued on roughly a five-year cycle: D1.1/D1.1M:2025 is the 25th edition, approved by ANSI on 19 March 2025 and revising D1.1/D1.1M:2020; the currently published designation is D1.1/D1.1M:2025-AMD1. Personnel credentials renew on their own clocks. Under AWS QC1, welding inspector certification is valid for three years; renewals are limited to two consecutive three-year periods, and before the end of the ninth year from initial certification the inspector must recertify — by examination, by a Committee-approved endorsement, or by experience and continuing education. A CAWI is not eligible for renewal and may hold that certification for up to three years only. Visual acuity examinations must be performed no more than one year before the examination date or the expiry date for renewals and recertifications. | Diarise from the certificate date, not from memory |
| Methods in scope | VT, MT, PT, RT, UT, Advanced ultrasonic systems including phased array (8.34) | Each method needs its own procedure and qualified personnel |
| Industries | Structural steel fabrication, Steel erection and construction, Bridges and highway structures, Tubular and offshore jacket structures, Industrial plant and equipment steelwork | Where this regime shows up in contracts |
Who does AWS D1.1 apply to?
Contractors, fabricators and inspection firms working to AWS D1.1 on welded structures made from the commonly used carbon and low-alloy constructional steels — structural steel buildings, plate girders, tubular structures, stud welding, and strengthening and repair of existing structures. It binds whoever the contract documents make responsible for inspection, which in practice splits between the Contractor's Inspector and the Owner's Verification Inspector.
Can an outsourced Level III sign for AWS D1.1 compliance?
Yes. AWS D1.1 accepts employer-based certification, which places the obligation on the employer and allows a contracted Level III to write and sign the written practice, approve procedures and administer examinations. The Level III must be qualified in each method they sign for, and the employer still owns the records.
What documents does a AWS D1.1 audit ask for?
Employer's written practice for NDT personnel qualification and certification, per ASNT SNT-TC-1A or ANSI/ASNT CP-189 (8.14.6.2), NDT personnel certification records, or current ANSI/ASNT CP-9712, CAN/CGSB-48.9712 or ISO 9712 certificates where the third-party route is used (8.14.6.3), Written NDT procedures for each method used (Clause 8, Part D), UT procedure for tubular T-, Y- and K-connections prepared by an NDT Level III (10.29.1), Inspector qualification records for both the Contractor's Inspector and the Verification Inspector (Clause 8, Part A). Auditors open records before they open manuals, because a manual describes intent while records show practice. The most common failure is a documented system that does not match what the technicians actually do.
How often is AWS D1.1 renewed?
The code is reissued on roughly a five-year cycle: D1.1/D1.1M:2025 is the 25th edition, approved by ANSI on 19 March 2025 and revising D1.1/D1.1M:2020; the currently published designation is D1.1/D1.1M:2025-AMD1. Personnel credentials renew on their own clocks. Under AWS QC1, welding inspector certification is valid for three years; renewals are limited to two consecutive three-year periods, and before the end of the ninth year from initial certification the inspector must recertify — by examination, by a Committee-approved endorsement, or by experience and continuing education. A CAWI is not eligible for renewal and may hold that certification for up to three years only. Visual acuity examinations must be performed no more than one year before the examination date or the expiry date for renewals and recertifications. Firms that diarise renewal from the certificate date rather than from the last audit avoid the lapse that forces a full reapplication.
What are the most common AWS D1.1 findings?
No written practice on file where NDT personnel are certified under the employer-based route of 8.14.6.2, UT operators certified to a general NDT scheme with no evidence of the supplementary examination on the code's own UT provisions, The Level III who signed the UT procedure for tubular T-, Y- and K-connections is not certified in that method, contrary to 10.29.1, MT and PT indications recorded and dispositioned without applying the linear and rounded definitions introduced in 8.10.1. These recur because they are records problems rather than capability problems — the work is being done correctly and the evidence is not being kept.
Which NDT methods does AWS D1.1 cover?
VT, MT, PT, RT, UT, Advanced ultrasonic systems including phased array (8.34), Radiation imaging systems (8.33). Each method in scope needs its own approved procedure and personnel qualified in that specific method; a Level III qualified in ultrasonics cannot sign for radiography.
Personnel certification under AWS D1.1
Explicitly dual-track since the 2025 edition. Subclause 8.14.6, Personnel NDT Certification, now carries subclauses: 8.14.6.2, Employer-Based Certification, allows NDT personnel to be certified in accordance with the employer's written practice by ASNT SNT-TC-1A or ANSI/ASNT CP-189; 8.14.6.3, Internationally Recognized Third-Party Certification, allows certification by ANSI/ASNT CP-9712, CAN/CGSB-48.9712 or ISO 9712. Employer-based certification is therefore squarely accepted, and an outsourced Level III can own the written practice and certify the technicians. Clause 10.29.1 goes further for tubular work: UT of T-, Y- and K-connections shall be performed to a written procedure prepared by an NDT Level III, with Level III certification obtainable through SNT-TC-1A and CP-189.
The audit sequence
- Contract documents invoke AWS D1.1 and specify the extent, category and timing of NDT (8.15)
- Contractor establishes inspector qualification under Clause 8 Part A and NDT personnel certification under 8.14.6, by the employer-based or third-party route
- An NDT Level III writes and approves the NDT procedures, including the UT procedure for tubular T-, Y- and K-connections that 10.29.1 requires
- Contractor's Inspector performs the inspection; the Owner's Verification Inspector checks the same work against the same clause
- Results reported per the examination, report and disposition subclauses for each method and evaluated against Table 8.1 and the Clause 8 Part C acceptance criteria
- Engineer approves any alternate acceptance criteria under 8.8 before they are applied
Documents an auditor asks for
- Employer's written practice for NDT personnel qualification and certification, per ASNT SNT-TC-1A or ANSI/ASNT CP-189 (8.14.6.2)
- NDT personnel certification records, or current ANSI/ASNT CP-9712, CAN/CGSB-48.9712 or ISO 9712 certificates where the third-party route is used (8.14.6.3)
- Written NDT procedures for each method used (Clause 8, Part D)
- UT procedure for tubular T-, Y- and K-connections prepared by an NDT Level III (10.29.1)
- Inspector qualification records for both the Contractor's Inspector and the Verification Inspector (Clause 8, Part A)
- Radiographs together with their examination, report and disposition records (8.18)
- Ultrasonic test reports (8.26) and dB accuracy certification records (8.31)
- UT equipment qualification and calibration records against IIW-type or other approved reference blocks (8.23, 8.24, 8.27)
- Visual inspection records evaluated against the Table 8.1 acceptance criteria
- Engineer's written approval where alternate acceptance criteria are used (8.8)
Findings firms get against AWS D1.1
- No written practice on file where NDT personnel are certified under the employer-based route of 8.14.6.2
- UT operators certified to a general NDT scheme with no evidence of the supplementary examination on the code's own UT provisions
- The Level III who signed the UT procedure for tubular T-, Y- and K-connections is not certified in that method, contrary to 10.29.1
- MT and PT indications recorded and dispositioned without applying the linear and rounded definitions introduced in 8.10.1
- Visual acceptance judged against the previous edition's Table 8.1, missing the revised undercut limits for welds under 12 in. and the new piping porosity limits
- Verification Inspector qualification records absent, or one individual acting as both Contractor's and Verification Inspector
- Radiographs not retained or dispositioned as 8.18 requires
- UT equipment qualification and dB accuracy certification records not maintained
- CWI working on an expired card, or past the two-renewal limit without having completed nine-year recertification
Related: the AWS D1.1 overview, outsourced ASNT Level III cover, written practice development, NDT procedure development, a programme gap assessment, interim Level III cover.