A practical guide for plant managers, engineers, and procurement teams on finding certified welding services in British Columbia — covering process types, CWB and ASME certification, pressure vessel requirements, and how to evaluate contractors.
Last Updated: April 18, 2026
A structural steel beam at a Nanaimo industrial facility develops a crack at a weld joint. The maintenance team needs a certified welder to assess and repair the weld — but the repair is on a load-bearing member, which means the work must be done to CSA W59 structural welding standards and the welder must hold the appropriate CWB qualification. Finding a contractor who can meet both the technical and certification requirements, and who can mobilize quickly, is the challenge.
BC has a large welding services sector, but the quality and certification levels vary significantly. This guide covers what to look for, what certifications matter for different applications, and how to write an RFQ that gets accurate quotes from qualified contractors.
The most common industrial welding processes in BC are MIG (GMAW), TIG (GTAW), stick (SMAW), flux-core (FCAW), and submerged arc (SAW). Each has different applications, advantages, and limitations.
MIG welding (GMAW) is the most common process for production welding. It is fast, versatile, and suitable for most steel and aluminum applications in thicknesses from 1.5mm to 25mm. TIG welding (GTAW) produces the highest quality welds with the best appearance and is used for stainless steel, aluminum, and applications requiring precise heat control — food-grade equipment, pharmaceutical vessels, and high-purity piping. Stick welding (SMAW) is the most portable process and is commonly used for field repairs, structural steel, and heavy plate work where portability matters more than speed. Flux-core (FCAW) is a higher-deposition-rate process used for heavy structural fabrication and shipbuilding. Submerged arc (SAW) is used for high-volume, high-deposition applications like pressure vessel fabrication and large structural members.
CWB (Canadian Welding Bureau) certification is the primary quality certification for welding companies and individual welders in Canada. A CWB-certified company has documented welding procedure specifications (WPS), qualified welders, and a quality management system that is audited by the CWB on a regular basis. Individual welder certification (CWB Level 1 or Level 2) confirms the welder has passed standardized qualification tests for specific processes and positions.
CWB certification is required by the National Building Code of Canada for structural steel welding (CSA W47.1 for fusion welding, CSA W47.2 for resistance welding). It is also required by many project owners and general contractors as a condition of contract. For industrial maintenance welding that is not covered by a specific code, CWB certification is not legally required but is a strong indicator of quality and process control.
Pressure vessel welding in BC is regulated under the BC Safety Authority (BCSA) and the ASME Boiler and Pressure Vessel Code. Welding companies performing pressure vessel work must hold ASME certification — typically an "S" stamp for power boilers, "U" stamp for unfired pressure vessels, or "R" stamp for repairs. Individual welders must be qualified to the applicable ASME Section IX procedures.
CWB certification alone is not sufficient for ASME pressure vessel work. If your application involves pressure vessels, boilers, or pressure piping, confirm the contractor holds the appropriate ASME stamp before engaging them. Unauthorized repairs to pressure vessels can create serious safety and regulatory exposure.
Beyond certifications, the evaluation criteria that matter most are material experience, equipment capability, and quality documentation. A contractor who primarily welds mild steel structural members may not have the process knowledge or equipment to weld duplex stainless steel or aluminum alloys. Ask for examples of similar work and references from customers who have had similar applications.
For field welding, confirm the contractor has the appropriate mobile equipment, hot work permit experience for your facility type, and WorkSafeBC coverage. For shop fabrication, ask about their quality documentation process — do they maintain weld maps, inspection records, and material traceability? For code work, this documentation is required; for non-code work, it is a strong indicator of a professional operation.
An effective welding RFQ includes the material type and thickness, the welding process preferred or required, joint configuration (butt, fillet, groove), any applicable code or standard (CSA W47.1, ASME, AWS D1.1), required certifications, quantity and dimensions, required delivery or completion date, and whether the work is in-shop or field. For structural work, include drawings or sketches. For repair work, describe the existing condition and the required outcome.
You can submit a welding services RFQ here or browse welding and metal fabrication suppliers in BC.
Directory Disclaimer: BC Industrial Supply is a supplier directory. We do not endorse or verify the certifications or capabilities of listed welding contractors. Always verify CWB certification, ASME stamps, WorkSafeBC clearance, and insurance independently before engaging any welding contractor.
CWB (Canadian Welding Bureau) certification is a third-party quality certification for welding companies and individual welders in Canada. CWB-certified companies have documented welding procedures, qualified welders, and a quality management system audited by the CWB. For structural steel, pressure vessels, and code-compliant fabrication in BC, CWB certification is often required by code or by the project owner.
Pressure vessel welding in BC is regulated under the BC Safety Authority (BCSA) and the ASME Boiler and Pressure Vessel Code. Welding companies must hold ASME certification (typically an "S" or "U" stamp) and employ welders qualified to ASME Section IX procedures. CWB certification alone is not sufficient for ASME pressure vessel work.
MIG (GMAW) is the most common process for production welding — fast, versatile, and suitable for most steel and aluminum applications. TIG (GTAW) produces the highest quality welds and is used for stainless steel, aluminum, and applications requiring precise heat control. Stick (SMAW) is the most portable process and is commonly used for field repairs and structural steel. The right process depends on the material, joint configuration, quality requirements, and whether the work is in-shop or field.
Submit an RFQ through a BC industrial supplier directory specifying the material, process required, location, and any certification requirements (CWB, ASME, etc.). For field repair work, also confirm the contractor has mobile welding equipment and the required hot work permit experience for your facility type.
Include the material type and thickness, the welding process preferred or required, joint configuration, any applicable code or standard (CSA W47.1, ASME, AWS D1.1), required certifications, quantity and dimensions, required completion date, and whether the work is in-shop or field. For structural work, include drawings or sketches.