How often does AISC certification renewal require a facility audit?

AISC Standard for Steel Building Structures (STS) certifications are renewed every three years, and each renewal cycle includes a facility audit. Auditors review all major elements of the QMS including WPS, PQR, WPQ records, inspection documentation, and NCR processes. Unannounced audits can also occur between renewal cycles.

What is the most common WPS-related finding in AISC certification audits?

Inadequate PQR coverage for the range of work being performed — particularly when shops have expanded their work scope since the last audit cycle. Adding a new base metal, switching to a new filler metal classification, or starting overhead production welding without updating the WPS/PQR library is one of the most frequent findings.

Can a fabricator use AWS D1.1 prequalified WPS to satisfy AISC certification audit requirements?

Yes. AISC STS recognizes AWS D1.1 prequalified WPS for applicable work. However, prequalified WPS must fully comply with Clause 4 requirements — all variables within prequalified limits, filler metals from the allowed list, joint geometry within tolerances. A document labeled 'prequalified' that does not actually meet those limits will fail the audit.

What happens if the AISC auditor finds a deficiency in WPS records?

Minor deficiencies result in a corrective action request (CAR) with a deadline for resolution. Major deficiencies or a cluster of minor ones can trigger suspension of certification until resolved. The goal is to close CARs with documented evidence of correction before the audit report is finalized.

Oct 20, 20267 min read

AISC Certification Renewal: WPS and PQR Audit Checklist

AISC certification renewal audits scrutinize WPS, PQR, and WPQ records closely. This checklist shows exactly what auditors look for and how to close gaps before the visit.

WPS PQR AISC Certification AWS D1.1 Quality Control Fabrication Audit

AISC certification under the Standard for Steel Building Structures (STS) or the companion Bridge Structures standard is a significant business asset for structural fabricators — it opens the door to AISC-specified projects, public infrastructure contracts, and general contractor approved-vendor lists. Losing certification, or failing renewal, can freeze new work for months.

The renewal audit puts the shop's quality management system under direct scrutiny, and the welding program — WPS, PQR, and WPQ records — consistently ranks among the top sources of findings. This article is a practical checklist for QC managers and CWIs preparing for an AISC certification renewal audit, organized around the questions auditors actually ask.

Understand What the Auditor Is Checking

AISC auditors follow the STS checklist, which maps to the shop's written Quality Manual. For the welding section, they are verifying two things:

That the shop has a valid, documented welding procedure qualification program that meets AWS D1.1 (or other applicable code) for all work currently being performed.
That the program is being followed — that production welds are traceable to a qualified WPS, that welders are current on their qualification records, and that inspection records are complete.

A shop that has excellent WPS on file but cannot demonstrate traceability from a production weld to the WPS and PQR will receive a finding. Documentation and traceability matter as much as the technical adequacy of the records themselves.

Pre-Audit Step: Map Your Work Scope Against Your WPS Library

Before any internal audit, produce a matrix of the shop's current work scope:

Base Metal	Welding Process	Position	Joint Type
A36, A572 Gr50	FCAW-G	F, H, V	Fillet, CJP groove
A992 W-shape	SMAW	F, H	Fillet, PJP
A500 HSS	GMAW	F, H	Fillet

Fill in the coverage column honestly. Any blank cell in the "Covered by WPS?" column is a finding waiting to happen. Address gaps before the auditor arrives.

The AISC certification audit readiness article covers the broader QMS preparation; this article focuses specifically on the welding documentation elements.

Checklist Item 1: WPS-to-PQR Traceability

Every WPS must either:

Reference a specific PQR by number, with the PQR on file and available for review, or
Document clearly that it is a prequalified WPS per AWS D1.1 Clause 4, with all Clause 4 limits met.

The auditor will pull WPS at random and ask to see the supporting PQR. If the file room cannot produce the PQR within a few minutes, that is a problem. Organize WPS and PQR in paired folders or in a cross-referenced index.

Red flag: WPS binders from a previous QC manager with no index and PQRs filed separately in no apparent order. This is a documentation control deficiency even if the technical content is sound.

Checklist Item 2: Essential Variable Coverage

For each active WPS, verify that the WPS parameters match what production is actually doing. The most common mismatches:

Thickness range. The PQR test plate governs the qualified thickness range per AWS D1.1 Clause 6. A WPS that states "unlimited thickness" for groove welds when the PQR test plate was 1/2 in. is technically wrong — the code limits qualification based on deposited weld metal thickness. See WPS qualification thickness and position ranges for the specific limits.

Filler metal classification. If production is using E71T-1C-H8 FCAW-G wire and the WPS specifies E71T-1C without the -H8 hydrogen designator, that is a minor inconsistency — but auditors notice it. Rule library based on AWS D1.1:2025; verify against your governing edition. Under AWS D1.1:2025 Table 6.6, a change to a lower hydrogen designator (e.g., from H16 to H8) is not an essential variable change requiring requalification, but the WPS should reflect what is actually being used.

Position. If production runs vertical-up CJP groove welds and the WPS was qualified by a flat-position PQR test, the WPS position coverage is inadequate. Auditors cross-reference WPS position coverage to production records including fit-up sheets and inspection logs.

Preheat. Confirm that preheat minimums on each WPS are achievable for the section thicknesses being welded, and that production records (fit-up inspection, welder self-inspection, or CWI inspection records) document preheat compliance. A WPS that specifies 200°F preheat and production inspection records that never mention preheat verification is a traceability gap.

Checklist Item 3: Welder Performance Qualification Records

WPQ records are the most-cited finding category across AISC audits in the structural category. Issues to clear before the auditor arrives:

Continuity. AWS D1.1 Clause 6.4.1 requires that any welder who has not used a given process for more than six months must requalify on that process. Pull a report of all welders by process and last-use date. Any welder with a gap of six months or more on any listed process should be requalified before the audit — or removed from that process designation on their WPQ until they requalify. A welder continuity tracking system prevents this from being a surprise.

Process and position scope. A welder qualified by a single plate test for SMAW 3G position is qualified for SMAW flat, horizontal, and vertical. They are not qualified for SMAW overhead, and not qualified for FCAW or GMAW. Verify that every welder's current-assignment processes and positions are within their qualified scope.

Test witnessing. Each WPQ must have been witnessed or certified by a CWI or Responsible Welding Engineer. Forms stamped by someone without that credential are nonconforming. The auditor will ask about the credentials of whoever signed the WPQ tests.

Continuity log. For shops seeking to demonstrate active continuity (rather than relying solely on six-month intervals), a per-welder log of weld dates by process is the best evidence. This can be maintained through daily production records, weld traveler sign-offs, or a QC software system.

Checklist Item 4: NCR and Weld Repair Documentation

AISC auditors review the nonconformance report log for the past cycle period. For welds, they look for:

Are NCRs being written for weld rejections identified by NDE or visual inspection?
Is the disposition documented (repair, accept by engineering concession, removal)?
Were repairs made under a qualified repair WPS, with inspection records showing the repair met acceptance criteria?
Are NCRs closed out with verifiable evidence, not just "repaired — OK"?

A shop with zero NCRs in three years is more suspicious to an auditor than one with a steady stream of documented, closed NCRs showing a functioning quality system. Auditors understand that welds get rejected; they are more concerned about whether the process for handling rejections is controlled.

Checklist Item 5: Inspection Records and CWI Continuity

The auditor will verify that inspection is being performed and documented consistently:

CWI credentials. The AWS CWI certification must be current. CWIs recertify every three years. An expired CWI credential on the QC manager means all inspection records signed by that individual after the expiration are technically signed by an uncertified inspector. Verify expiration dates and recertification status before the audit.

Inspection log completeness. Fit-up, preheat, visual post-weld, and NDE records must be traceable to specific joints by mark number or weld ID. A shop that uses informal handwritten notes without systematic filing will struggle to demonstrate traceability.

NDE qualification. If the shop performs its own UT or MT inspection, verify that the technicians hold current ASNT SNT-TC-1A certifications at the required level for the NDE methods being performed, and that the certifications are documented in the personnel file.

Checklist Item 6: Control of Welding Consumables

Filler metal storage and control is a recurring audit finding, particularly for low-hydrogen SMAW electrodes and moisture-sensitive FCAW wires. Verify:

Electrodes requiring low-hydrogen storage (E7018 and other H-designated electrodes) are in a heated rod oven at ≥250°F when not in immediate use.
Opened FCAW wire spools are sealed or stored per manufacturer requirements between shifts.
Filler metal receiving inspection is documented, including classification verification against the filler metal certification (CMTR).
Filler metal for production work is traceable to the heat/lot number on the WPS filler metal records.

Two Weeks Before the Audit: Run a Mock Audit

Assign a QC team member who was not involved in creating the records to play auditor for a day. Have them pull five WPS at random, ask for the supporting PQR, check five welder records for continuity, and trace three recent production welds from fit-up record to final inspection. Note every hiccup. Fix what you find.

Shops that run internal pre-audits consistently report fewer major findings on the actual audit. The AISC certification process is designed to raise quality floors, not to surprise fabricators — an auditor who sees a shop that takes its own records seriously will approach the audit differently than one walking into an unprepared program.

A digital WPS and qualification management platform that tracks WPS-to-PQR traceability, welder qualification continuity, and NDE records in one system can significantly reduce the manual effort of both pre-audit preparation and day-of evidence production — letting QC staff demonstrate a live system rather than scrambling through binders.

FAQ

Frequently asked.

How often does AISC certification renewal require a facility audit?: AISC Standard for Steel Building Structures (STS) certifications are renewed every three years, and each renewal cycle includes a facility audit. Auditors review all major elements of the QMS including WPS, PQR, WPQ records, inspection documentation, and NCR processes. Unannounced audits can also occur between renewal cycles.
What is the most common WPS-related finding in AISC certification audits?: Inadequate PQR coverage for the range of work being performed — particularly when shops have expanded their work scope since the last audit cycle. Adding a new base metal, switching to a new filler metal classification, or starting overhead production welding without updating the WPS/PQR library is one of the most frequent findings.
Can a fabricator use AWS D1.1 prequalified WPS to satisfy AISC certification audit requirements?: Yes. AISC STS recognizes AWS D1.1 prequalified WPS for applicable work. However, prequalified WPS must fully comply with Clause 4 requirements — all variables within prequalified limits, filler metals from the allowed list, joint geometry within tolerances. A document labeled 'prequalified' that does not actually meet those limits will fail the audit.
What happens if the AISC auditor finds a deficiency in WPS records?: Minor deficiencies result in a corrective action request (CAR) with a deadline for resolution. Major deficiencies or a cluster of minor ones can trigger suspension of certification until resolved. The goal is to close CARs with documented evidence of correction before the audit report is finalized.