Does AWS D1.1 require a CWI to be present for all structural welds?

AWS D1.1 requires that welding inspection be performed by qualified welding inspectors, but the code does not mandate a full-time on-site CWI for every weld in a shop environment. The contract documents and AISC Chapter N distinguish QC inspector (shop) from QA inspector (owner/EOR-appointed), and the inspection frequency depends on the loading category and joint type.

What is a Certified Welding Engineer (CWE) and when is one required?

A Certified Welding Engineer (CWE) is an AWS credential for engineers with welding engineering knowledge. AWS D1.1 does not itself mandate a CWE on structural projects, but contract specifications, AISC certification requirements, or ISO 3834 quality level designations may require an engineer with specific welding engineering qualifications to sign off on the WPS program or quality plan.

Does ISO 3834 require a welding coordinator?

Yes. ISO 3834 (Quality Requirements for Fusion Welding) in all three quality levels (Basic, Standard, Comprehensive) requires a responsible welding coordinator—a person with documented welding knowledge and experience who takes ownership of the WPS program, welder qualification records, and quality system compliance. The level of required knowledge increases with the quality level.

Can a CWI serve as the welding coordinator under ISO 3834?

It depends on the quality level and the specific knowledge requirements. ISO 14731 defines the technical knowledge tasks for welding coordinators, and the knowledge level required may exceed what a CWI credential alone covers for ISO 3834 Comprehensive quality level applications. Coordination with your certification body is necessary to confirm.

Sep 24, 20267 min read

Welding Coordinator vs. CWI vs. CWE: Roles Under AWS D1.1

How the roles of Certified Welding Inspector (CWI), Certified Welding Engineer (CWE), and welding coordinator differ under AWS D1.1:2025 and ISO 3834, and how fab shops assign responsibility for WPS programs.

WPS AWS D1.1 CWI welding engineer ISO 3834 quality management inspection

New to procedures? Start with WPS welding: what a welding procedure specification is, with a filled-in example.

A structural fabrication shop that builds to AWS D1.1 has a WPS program, qualified welders, and a CWI signature on inspection records. But add an ISO 3834 certification requirement to the contract, or an AISC Special certification tier, or an owner who asks "who is your responsible welding engineer?"—and the roles start to matter in ways the shop may not have defined clearly. Understanding the difference between a Certified Welding Inspector, a Certified Welding Engineer, and a welding coordinator is practical knowledge for QC managers staffing a quality program under AWS D1.1.

Rule library based on AWS D1.1:2025; verify against your governing edition (the AHJ or contract may specify 2020 or earlier).

Certified Welding Inspector (CWI): The Production-Side Role

The AWS Certified Welding Inspector credential is administered by the American Welding Society under AWS QC1. A CWI has demonstrated knowledge of weld inspection methods, weld discontinuity assessment, NDE fundamentals, welding symbols, and the applicable codes and standards.

Under AWS D1.1, the CWI's role is primarily verification and inspection:

Reviewing WPS documentation before production begins, confirming that the WPS is valid for the joint, process, position, and base metal.
Verifying that welders are currently qualified for the assigned procedure and position, with WPQ records showing no lapsed continuity (AWS D1.1 Clause 6.4.1 — see welder continuity 6-month rule).
Inspecting joint fit-up, preheat, and tack weld quality before welding begins.
Monitoring production welding for parameter compliance — verifying amperage, voltage, travel speed, and interpass temperature are within the WPS range.
Conducting post-weld visual inspection against AWS D1.1 Table 8.1 acceptance criteria (for statically loaded structures) or the cyclic loading criteria where applicable.
Documenting NDE results and signing off on repair disposition records.

The CWI is the code's primary recognition of a qualified inspection practitioner. AWS D1.1 Clause 8.1 states that welding inspection shall be performed by a CWI in accordance with AWS QC1, or by an inspector specifically approved by the engineer. This is the baseline requirement for structural welding inspection on AWS D1.1 projects.

What the CWI credential does not require is a professional engineering license, design authority, or WPS authorship responsibility. A CWI verifies compliance with the WPS — the CWI typically does not write the WPS, though many experienced CWIs do write procedures for their shops and have the practical knowledge to do so.

Certified Welding Engineer (CWE): The Engineering Credential

The AWS Certified Welding Engineer credential is an engineering-level certification targeting personnel with advanced technical knowledge of welding metallurgy, design, process selection, and the engineering analysis that underpins welding procedure development. To qualify for the CWE examination, candidates typically need an engineering degree plus relevant experience, or substantial accumulated experience in lieu of a degree.

AWS D1.1 does not cite "CWE" as a required credential on structural projects. The structural welding code is largely silent on who authors the WPS — the standard requires a valid WPS (qualified or prequalified per Clause 5 or 6), but it does not require a CWE signature on it. You can have a shop supervisor with years of experience and no formal certification write a technically valid prequalified WPS.

Where a CWE becomes relevant is at the contract or certification level:

Some owner specifications for critical infrastructure or industrial projects (power plant structural steel, heavy industrial, petrochemical) require that the welding program be managed by or reviewed by a licensed welding engineer or equivalent.
AISC certification programs at higher certification levels (Complex category) include criteria around engineering oversight of the welding quality program.
ISO 3834 Comprehensive quality level under ISO 14731 defines knowledge levels for responsible welding coordinators that, at the highest tier, require engineering-level understanding of welding metallurgy, residual stress, and fracture mechanics — the territory a CWE typically covers.

If a contract requires a CWE or "responsible welding engineer," the shop needs to identify that person formally in their quality manual and ensure they are accessible for WPS program decisions.

Welding Coordinator: The ISO 3834 Role

ISO 3834 (Quality Requirements for Fusion Welding of Metallic Materials) is an international quality management framework that parallels AWS D1.1's quality provisions but adds a formal quality system structure. When a project, client, or market certification requires ISO 3834 compliance, the concept of the responsible welding coordinator becomes mandatory.

ISO 14731 (Welding Coordination — Tasks and Responsibilities) is the companion standard that defines what a welding coordinator does and what knowledge level they need. ISO 14731 breaks down coordination tasks into categories including:

Review of product and order requirements (confirming the WPS covers the specified joints and base metals)
WPS and PQR preparation, review, and approval
Qualification of welding personnel (oversight of WPQ and continuity tracking)
Welding consumable management
Equipment control (calibration, suitability for the procedure)
Preheat and post-weld heat treatment execution
NDE coordination
Nonconformance and repair oversight

The welding coordinator under ISO 3834 is a responsible role — not just an inspector checking compliance, but the person accountable for the entire welding quality system. This is more than a CWI inspection function. It is a management role with technical authority over the WPS program.

ISO 3834 has three quality levels (Comprehensive, Standard, and Basic), and the required knowledge level of the coordinator scales with the level. Comprehensive (3834-2) requires knowledge mapped to the highest tier of ISO 14731, which aligns with an International Welding Engineer (IWE) qualification in the International Institute of Welding (IIW) framework, or equivalent demonstrated competence.

How the Three Roles Work Together in a Fab Shop

In a well-structured fabrication quality program under AWS D1.1, these roles typically divide as follows:

WPS authorship and engineering oversight: A senior QC engineer, a CWE, or an outside welding engineer writes and signs the WPS and PQR. On prequalified WPS projects, the shop's QC manager often handles this if they have sufficient experience, because the code path is defined and does not require engineering analysis of test data. On tested WPS work, especially for high-strength or specialty steels, an engineer-level practitioner who can interpret PQR mechanical test results is warranted.

CWI inspection: The shop's CWI (or CWIs) handle production inspection — joint fit-up, in-process monitoring, post-weld visual, and NDE coordination. This is a full-time role on active production. The welding ITP and CWI hold points article covers how to structure the inspection plan around CWI hold and witness points.

Welding coordinator function (ISO 3834): When ISO 3834 certification is in play, the quality manual must identify the responsible welding coordinator by name and document their qualifications. In many shops, this role falls to the QC manager or lead engineer. The coordinator role is not just a title — it requires documented authority to approve, reject, or modify the WPS program without production pressure overriding quality decisions.

The coordinator function also crosses into the administrative side of WPS management: ensuring that the WPS library is current, that weld procedure qualifications cover all production joints actually being welded, that welder WPQ records are tracked and no lapsed qualifications slip through, and that NDE records are filed with traceability back to the WPS used.

Inspection Independence: QC vs. QA Under AISC Chapter N

AISC 360 Chapter N and AISC 341 (for seismic) draw a formal line between contractor quality control (QC) inspection and owner quality assurance (QA) inspection. This distinction is important for staffing.

QC inspection is the contractor's own inspection, typically performed by the shop's CWI. This is the fabricator's self-check against the WPS and code requirements.
QA inspection is the owner's or engineer of record's independent verification, performed by a third-party CWI or inspection agency. The QA inspector is not the shop's employee and reports to the owner or EOR.

AWS D1.1 Clause 8 uses the terms similarly. For structural projects subject to IBC Chapter 17 special inspection requirements, the special inspector performing the third-party inspection must be independent of the fabricator or contractor. This special inspector is typically a CWI employed by a third-party inspection agency.

The roles in the shop — QC engineer, CWI, welding coordinator — operate on the contractor side of that line. The QA inspector on the owner side observes and audits the contractor's quality program but does not manage it.

Practical Staffing Guidance for Small Fab Shops

Most small structural fabrication shops do not have separate staff for every role. In a shop of 10–30 welders, a common structure is:

One CWI: Handles all production inspection, WPS compliance monitoring, and WPQ tracking. May also write prequalified WPS procedures if experienced.
QC manager or shop supervisor: Holds authority over the quality program, approves WPS documents before they go to the CWI, and manages the documentation system.
Outside welding engineer (as-needed): Retained for PQR test weld development on specialty steels, for engineering review of tested WPS procedures, or for code interpretation questions.

When ISO 3834 certification is a contract requirement, the shop needs to formally document who fills the welding coordinator role and confirm their qualifications against ISO 14731. It is not sufficient to say "the CWI coordinates welding" without mapping the individual's knowledge to ISO 14731's task list at the applicable quality level.

Building a documented WPS program — with WPS, WPQ records, welder continuity tracking, and inspection records in one system — makes it easier to demonstrate the quality program to an owner's QA inspector or an ISO 3834 auditor. If you are building that program, wpswelding.com/pricing provides the WPS drafting, qualification matrix, and continuity tracking tools that support the coordinator function without paper-based records management.

For more on structuring inspection documentation, see welding QC turnover package and inspection records and AISC Chapter N QC/QA structural welding program.

FAQ

Frequently asked.

Does AWS D1.1 require a CWI to be present for all structural welds?: AWS D1.1 requires that welding inspection be performed by qualified welding inspectors, but the code does not mandate a full-time on-site CWI for every weld in a shop environment. The contract documents and AISC Chapter N distinguish QC inspector (shop) from QA inspector (owner/EOR-appointed), and the inspection frequency depends on the loading category and joint type.
What is a Certified Welding Engineer (CWE) and when is one required?: A Certified Welding Engineer (CWE) is an AWS credential for engineers with welding engineering knowledge. AWS D1.1 does not itself mandate a CWE on structural projects, but contract specifications, AISC certification requirements, or ISO 3834 quality level designations may require an engineer with specific welding engineering qualifications to sign off on the WPS program or quality plan.
Does ISO 3834 require a welding coordinator?: Yes. ISO 3834 (Quality Requirements for Fusion Welding) in all three quality levels (Basic, Standard, Comprehensive) requires a responsible welding coordinator—a person with documented welding knowledge and experience who takes ownership of the WPS program, welder qualification records, and quality system compliance. The level of required knowledge increases with the quality level.
Can a CWI serve as the welding coordinator under ISO 3834?: It depends on the quality level and the specific knowledge requirements. ISO 14731 defines the technical knowledge tasks for welding coordinators, and the knowledge level required may exceed what a CWI credential alone covers for ISO 3834 Comprehensive quality level applications. Coordination with your certification body is necessary to confirm.