Certification deep-dive
CWB certified welding — what CSA W47.1 actually means
"CWB certified" gets thrown around a lot in fabrication marketing. Most people don't know what it actually means. This page explains the certification, why it exists, what it actually covers, and why it matters when you are picking a fabrication shop for any structural work.
What CWB is
The Canadian Welding Bureau (CWB) is a division of the CWB Group, a not-for-profit organization founded in 1947 to administer welding certification in Canada. It's the Canadian equivalent of the American Welding Society's certification program, and it's referenced directly by Canadian standards including CSA W47.1, CSA W47.2, CSA W186, and CSA W178.
The relevant standard for steel fabrication is CSA W47.1 — Certification of companies for fusion welding of steel. This is the standard that the National Building Code of Canada and the BC Building Code reference for structural steel welding. If you weld steel that carries structural load in Canada, CSA W47.1 is the standard you have to meet.
What CSA W47.1 certification actually covers
The standard covers five things:
- Welder qualification: Each welder in the shop has to pass qualification tests for the specific welding processes, positions, and joint types they will work on. The qualifications are documented and have to be maintained.
- Welding procedure specifications (WPS): Each welding process used in the shop has to have a written procedure that specifies materials, joint design, electrode/wire type, voltage, amperage, travel speed, and inspection criteria. Each procedure has to be qualified by test welds and approved.
- Welding supervision: The shop has to have a qualified welding supervisor (Division 1 requires a CWB-approved welding engineer). The supervisor is responsible for ensuring procedures are followed and welds meet acceptance criteria.
- Material control: Steel and filler metals have to be traceable. Mill test reports, material certifications, and storage practices are documented and audited.
- Quality management: The shop has to have a documented quality control program covering inspection, non-conformance, corrective action, and record-keeping.
Why structural engineers require it
A structural engineer who seals drawings for any steel structure in BC is relying on the assumption that the welds will be made correctly. "Correctly" means: the right material, the right procedure, a qualified welder, and documented inspection. CWB certification is the documentation that proves all four. Without it, the engineer has no basis for sealing the drawings, the building inspector has no basis for approving the work, and the building owner has no recourse if the structure fails.
On every structural steel fabrication project we handle — staircase stringers, structural beams and columns, custom canopies, miscellaneous structural metals — the project structural engineer expects to see CWB certification. We provide certificate numbers and weld test documentation as a normal part of the closeout package on commercial work.
What we do at Jeff and Simon
Jeff and Simon Ironworks has been CWB certified to CSA W47.1 since the early 2000s. The certification covers the welding processes we use day to day — primarily SMAW (stick), GMAW (MIG), and FCAW (flux cored arc) on steel up to the structural sizes we typically fabricate. Our welders are individually qualified and our procedures are documented and audited annually by the CWB.
The practical effect: when an engineer needs structural welding done on a project we're fabricating, we can provide the documentation the engineer needs to seal the drawings. When a building inspector asks about welding qualification, we have the certificate. When a GC asks for closeout documentation, we have the test reports.
How to verify CWB certification
- Ask the fabrication shop for their CWB certificate number.
- Go to the CWB Group website (cwbgroup.org) and use the company directory lookup.
- Check the certificate is current, the division matches the work scope, and the standards covered include CSA W47.1.
- For commercial projects, ask to see specific welder qualification records and welding procedure specifications relevant to your project.
What "CWB certified" does not mean
A few clarifications. CWB certification is not a guarantee of quality on every weld — it is a guarantee that the shop has the systems in place to produce quality welds consistently. The certification covers structural fusion welding, not finish quality, project management, or installation. And it is shop-level certification — individual welder qualifications are part of it, but the certificate is held by the company, not by individual welders.
Welding processes covered under our CWB certification
Our CWB certification covers the welding processes we use on the fabrication work we actually do:
- SMAW (Shielded Metal Arc Welding / stick): Traditional stick welding. Good for field work, heavy structural, and situations where portability matters more than speed. We use SMAW for site welding and for heavy structural sections.
- GMAW (Gas Metal Arc Welding / MIG): Continuous wire feed with shielding gas. Faster than SMAW, cleaner welds, ideal for shop fabrication of mild steel. Our primary shop welding process.
- FCAW (Flux Cored Arc Welding): Similar to MIG but uses flux-cored wire. Penetrates better on dirty or painted steel, good for field work and thicker sections.
Each process has its own qualified procedures in our shop, with written welding procedure specifications (WPS) that define electrode/wire type, shielding gas, voltage, amperage, travel speed, interpass temperature, and inspection criteria.
What a non-conformance looks like
Even in a well-run CWB shop, welds occasionally come out wrong. What matters is how the shop handles it. Our process when a non-conformance is identified:
- Document the non-conformance — what weld, what problem, what caused it.
- Assess whether repair is acceptable per CSA W47.1 (some defects can be ground out and re-welded; others require the part to be scrapped).
- Execute the repair by a qualified welder following the qualified repair procedure.
- Re-inspect the repaired weld.
- Review whether the root cause points to a procedural issue that needs broader correction (welder training, procedure update, equipment calibration).
This discipline is what CWB certification actually delivers. Individual welds can go wrong anywhere; a certified shop has the systems to catch them and correct them.
Related reading
For the broader process that CWB certification supports, see our shop drawings & process page. For how this affects architects and contractors specifying custom fabrication, see the architect & contractor guide. For material-specific considerations, see the materials guide.
FAQs about CWB certification
What is CWB certification?
CWB (Canadian Welding Bureau) certification means a fabrication shop has been audited and approved to perform welding to a specific Canadian standard — most commonly CSA W47.1 for fusion welding of steel structures. The certification covers welder qualifications, written welding procedures, material control, inspection processes, and quality management. CWB audits the shop annually to maintain the certification.
Why do structural engineers require CWB certification?
Because CWB certification is the standard the National Building Code and the BC Building Code reference for structural welding. A structural engineer who seals drawings for a steel structure is relying on the assumption that the welds will be made by a qualified welder using a qualified procedure on traceable material. CWB certification is the documentation that proves all three. Without it, the engineer cannot seal the drawings and the building inspector will not approve the work.
What is the difference between Division 1, 2, and 3 certification?
CSA W47.1 has three divisions. Division 1 is the highest — it requires full-time CWB-approved welding engineers on staff and is typical for major structural steel fabricators. Division 2 requires a CWB-approved welding supervisor with specific qualifications. Division 3 is for shops doing limited structural work under closer supervision. Jeff and Simon is certified at the level appropriate for the work we do, which covers structural staircases, structural steel for residential and commercial projects, and miscellaneous structural metalwork.
How can I verify a shop's CWB certification?
Every CWB-certified shop has a certificate number that can be looked up on the CWB website (cwbgroup.org). The certificate shows the division, the standards covered, the welding processes approved, and the expiration date. Ask any fabrication shop for their certificate number — a real CWB-certified shop will provide it without hesitation.
Does CWB certification matter for non-structural work?
Strictly speaking, no — non-structural welding (decorative work, cosmetic railings, ornamental gates) does not require CSA W47.1 certification. But the same shop discipline that produces certified welds on structural work also produces better-quality welds on non-structural work. A CWB-certified shop has documented procedures, qualified welders, and quality control habits that show up in everything they fabricate.
What is the difference between CWB and AWS certification?
CWB is the Canadian welding certification system, administered by the CWB Group under Canadian Standards Association (CSA) standards like W47.1 and W59. AWS is the American Welding Society's certification system under AWS D1.1. The two are similar in purpose and technical content but they are administered by different organizations and referenced by different codes. In Canada, CWB is what the National Building Code and the BC Building Code reference for structural welding.
How often is a CWB-certified shop audited?
CWB conducts annual audits of certified shops to verify the welding procedures, welder qualifications, material control, and quality management systems are still in place and being followed. Additional audits can be triggered by major changes in the shop (new welding processes, new welders, changes in equipment) or by customer complaints.
Are CWB certifications transferable between shops?
No. CWB certification is held by the company, not by individual welders or employees. If a welder moves from one CWB-certified shop to another, they have to be re-qualified at the new shop under the new shop's procedures before they can weld on certified structural work.
What happens if a CWB-certified shop produces a bad weld?
The immediate response is internal quality control catches the weld, documents the non-conformance, and either repairs or rejects the work. For welds that slip through and are discovered later, the shop's quality management system requires investigation, corrective action, and documentation. For safety-critical structural welds, the structural engineer and the building official may be involved in the resolution.
Can I see a welder's qualification records?
Yes. CWB-qualified welders have individual qualification records showing the processes, positions, materials, and joint types they're qualified for. On commercial projects, the structural engineer or the GC may request these records as part of the submittal process. A legitimate CWB-certified shop provides them without hesitation.
What materials can CWB-certified shops weld?
The CWB certification is specific to the materials and welding processes listed on the shop's certificate. Most shops are certified for carbon steel welding under CSA W47.1. Shops that work with aluminum have additional certification under CSA W47.2. Shops that weld stainless steel usually operate under a similar framework but the certification details vary. Check the shop's certificate for the specific scope of their CWB approval.
How do I know if a welder I hire freelance is actually qualified?
For structural work, you shouldn't hire freelance welders. The CWB system is built around shop certification — welders are qualified within a specific shop's procedures and quality management system, not as individual tradespeople. If a building inspector or structural engineer sees welds made by an uncertified welder on structural work, they can reject the work. Always work with a CWB-certified shop for any structural welding.
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