Frequently Asked Questions

An AWS Certified Welding Inspector (CWI) is a credential issued by the American Welding Society after passing a comprehensive three-part examination covering welding inspection theory, practical weld evaluation, and code application. The exam is rigorous — it tests knowledge of metallurgy, weld process fundamentals, visual and NDE acceptance criteria, and the specific code sections most commonly referenced on industrial and construction projects.

Most structural steel, pipeline, bridge, and fabrication project specifications — and most owner QA requirements — explicitly require third-party CWI inspection. The governing codes back this up: AWS D1.1 references CWI qualification for inspection personnel; API 1104 requires qualified inspectors for pipeline weld acceptance; many IBC-governed projects require CWI credentials as part of the Special Inspection Program.

Beyond contractual compliance, a CWI provides independent documentation that welds meet the acceptance criteria of the governing code. That documentation protects the owner, the GC, and the engineer of record if a quality question arises at closeout, during AHJ inspection, or years later.

Yes — they are different credentials that cover different scopes, and most data center and structural steel projects require both.

The ICC Structural Steel and Bolting Special Inspector (S1) is a certification issued by the International Code Council specifically for the inspection of structural steel connections and high-strength bolted assemblies under the International Building Code (IBC). It covers:

• High-strength bolt installation and pretensioning per AISC 360 and RCSC
• Structural steel fabrication and erection inspection
• Verification of bolt assemblies, installation methods, and connection documentation

An AWS CWI covers weld inspection. An ICC S1 covers bolt-up inspection. A project that has both welding and high-strength bolted connections — which is most structural steel projects — technically requires both credentials in the inspector.

CWI-Grid inspectors hold both AWS CWI and ICC S1 certifications, covering both scopes under a single inspector engagement. You don’t need two firms.

AWS CWI and ICC S1 are nationally recognized credentials — they are not state-issued licenses and are not limited to a specific jurisdiction. Most states and AHJs accept these credentials directly as the qualification standard for welding inspection and special inspection work under IBC.

That said, a small number of jurisdictions have their own Special Inspector registration requirements in addition to holding the credential. Where this applies, we research your AHJ’s specific requirements before mobilization and address any registration steps in advance. If your jurisdiction requires a specific pre-approval or registration, we’ll know before day one — not after we arrive on-site.

If you have a specific state or municipality in mind, send us the project location when you request a quote and we’ll confirm credential alignment with your AHJ as part of the scoping process.

Our two primary service areas are structural steel inspection and pipeline weld inspection, with a specific focus on:

• Data center construction — structural steel erection, high-strength bolt-up, embedded plate inspection, and AHJ special inspection documentation
• Pipeline projects — cross-country transmission, gas distribution, midstream gathering, pipeline integrity repairs, and compressor/pump station piping under API 1104, ASME B31.4, and ASME B31.8
• General structural steel — commercial and industrial buildings, warehouses, infrastructure, and fabrication shop inspection
• Bridge and DOT work — highway bridges, pedestrian structures, and DOT-governed infrastructure under AWS D1.5
• Turnarounds and maintenance — field inspection during planned outages, repairs, and modification scopes

If your project falls outside these categories, send the scope. We’ll identify the governing code and confirm whether it falls within our inspection capabilities.

Yes — this is one of the most practical advantages of working with CWI-Grid. Because our inspectors hold both AWS CWI and ICC S1 credentials, a single inspector can cover:

• Visual weld inspection and hold point documentation per AWS D1.1 or applicable code
• High-strength bolt-up inspection per AISC 360 and RCSC, including pretensioning verification and SIP documentation

On most structural steel projects — particularly data centers and commercial construction — both scopes are active simultaneously during steel erection. Managing them through a single credentialed inspector eliminates the coordination overhead of running two separate inspection firms, simplifies your Special Inspection Program documentation, and gives your PM a single point of contact for all hold point sign-offs.

We handle NDE coordination. You shouldn’t have to manage the sequencing between your welding crew, your inspector, and an NDE subcontractor — that creates schedule gaps and missed hold points.

Our NDE coordination scope includes:

• Coordinating RT, UT/PAUT, MT, and PT subcontractors based on your inspection and test plan (ITP)
• Verifying NDE coverage aligns with hold points and code-required examination frequency
• Reviewing film, digital radiographs, and NDE reports against API 1104, AWS D1.1, or ASME acceptance criteria
• Documenting defect findings and disposition recommendations
• Scheduling repair re-inspection after defect correction

We work with your existing NDE vendors or can recommend qualified subcontractors based on your project location and scope.

Most projects are confirmed and mobilized within 24–48 hours of contract execution. For active construction timelines with welding or steel erection already underway, we treat mobilization as a scheduling priority.

That said, earlier engagement produces better results. Engaging us at the time of your steel erection subcontract award or pipeline welding crew mobilization gives us time to:

• Review structural drawings and identify all hold and witness points
• Confirm credential alignment with your AHJ before the first piece of steel goes up
• Coordinate with your site superintendent on daily inspection scheduling
• Review your WPS/PQR package and flag any gaps before welding begins

Early engagement costs nothing. Late engagement costs schedule. If you’re already behind on inspection coverage, contact us — we’ll work with what you have.

Yes — we deploy nationally. CWI-Grid is based in Monroe, Michigan, but project location does not limit our availability. We have deployed to pipeline, structural steel, and data center projects across the country.

Travel, mobilization, and per diem are scoped separately based on your project location and estimated duration — they are not included in the standard hourly rate. When you request a quote, include the project address or general region and we’ll build a fully scoped cost estimate that includes all travel components, so there are no surprises on the invoice.

For long-duration pipeline or multi-phase projects in remote locations, we discuss lodging and per diem arrangements up front so both sides have a clear picture of total project cost before mobilization.

Construction schedules change — that’s the nature of the work. We build schedule flexibility into every project engagement.

Here’s how we handle it in practice:

• Short-notice delays (1–3 days): Communicate as early as possible and we’ll reschedule around your revised timeline. No penalty for reasonable notice.
• Extended holds or weather delays: We pause the engagement and resume when the schedule is back on track. You don’t pay for days the inspector isn’t on-site.
• Scope additions mid-project: If your project expands — additional phases, added welding scope, or a new bolt-up package — we’ll amend the engagement. Same inspector, same documentation standard, no re-onboarding.
• Schedule compression: If your timeline tightens and you need more inspection coverage per day, contact us. We’ll discuss extended shifts or additional inspector deployment based on availability.

We ask for the same consideration in return: as much advance notice as possible when schedules shift, so we can manage availability across concurrent projects.

Standard single-inspector engagements start at $120/hr. This covers on-site inspection time, hold point documentation, and same-day or next-morning report delivery.

The following are scoped and quoted separately based on project specifics:

• Travel and mobilization — mileage or airfare depending on project distance
• Per diem — lodging and subsistence for out-of-area projects
• Multi-phase or extended projects — often quoted as a package with a defined daily or weekly structure
• NDE coordination — scoped separately if subcontractor management is required

There is no minimum project size. A one-day welder qualification witness is as straightforward to scope as a multi-month pipeline inspection program. When you submit a quote request, include your project location, estimated duration, and governing code and we’ll return a fully itemized estimate within one business day.

Documentation is delivered same-day or next morning for each inspection day. At project closeout, you receive a complete inspection record package that includes:

• Inspection reports — dated, with accept/reject calls, weld IDs, joint numbers, and inspector signature
• Photo documentation — weld-by-weld or joint-by-joint photos tied to the inspection log
• Weld maps — sequential joint traceability for structural and pipeline welds
• Bolt-up records — pretensioning method, bolt assembly verification, and connection-by-connection sign-off per AISC/RCSC
• NDE coordination records — subcontractor reports, coverage verification, and defect disposition logs
• Preheat/interpass logs — on pipeline projects where temperature monitoring is part of the scope
• AHJ submittal package — formatted for your jurisdiction’s Special Inspection closeout requirements

All documentation is formatted to satisfy AHJ submittals, owner QA requirements, and operator records — not a generic inspection form that requires translation before it’s useful. If your project has a specific documentation format required by the owner or engineer of record, send it to us before mobilization and we’ll align our reports to match.

Three steps — and the first one takes under five minutes:

• Step 1 — Send your scope. Use the contact form to send us your project location, governing code or specification, anticipated start date, and estimated duration. Include your WPS/PQR package or SIP if you have it — early review improves mobilization speed. Don’t worry if you don’t have everything yet. Send what you know.
• Step 2 — We confirm and quote. We review your scope, confirm credential alignment with your AHJ or owner requirements, and return a fully itemized quote within one business day. If there are questions, we’ll call or email before assuming.
• Step 3 — We mobilize. Once you execute the service agreement, most projects mobilize within 24–48 hours. We review drawings, identify hold points, coordinate with your site super, and show up inspection-ready on day one.

That’s it. No lengthy onboarding, no credential gaps, no surprises at the hold point.