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At Edmonton Exchanger (EDEX), specialized welding is more than a process—it’s a core strength. With over 1,250 ABSA-certified weld procedures, the company delivers precision, safety, and innovation in every weld. Built for the demands of Alberta’s climate and the technical challenges of industrial fabrication, EDEX’s welding capabilities are a key pillar of its success.
Rigorous Compliance with Industry Codes
EDEX weld procedures are developed in accordance with ASME Section IX, which includes compliance with other recognized standards such as American Petroleum Institute (API), ASTM International, and National Association of Corrosion Engineers (NACE). Every weld procedure specification (WPS) and procedure qualification record (PQR) is designed to meet or exceed industry standards for strength, durability, and safety.
Qualified Procedures and Certified Welders
The company’s extensive library of WPS and PQR documents supports a wide range of materials and configurations. Every welder at EDEX is certified through formal welder performance qualifications (WPQ), ensuring consistent, code-compliant performance on every project.
Advanced Welding Techniques
To meet the demands of large-scale industrial fabrication, EDEX employs advanced welding processes including:
- Submerged Arc Welding (SAW)
- Gas Tungsten Arc Welding (GTAW)
- Shielded Metal Arc Welding (SMAW)
- Gas Metal Arc Welding (GMAW)
- Flux-Cored Arc Welding (FCAW)
- TIP TIG Welding Technology
- Semi-automated and automated welding systems for maximum precision and productivity
These techniques support high-efficiency work on heavy and complex components such as pressure vessels, radiant coils, and heat exchanger bundles.
QA/QC and Full Weld Traceability
EDEX maintains stringent quality assurance and control procedures throughout every stage of the welding process. Inspections include visual (VT), radiographic (RT), ultrasonic (UT), magnetic particle (MT), dye penetrant (PT), positive material identification (PMI), and hardness testing (HT).
Every weld is traceable—from base metal to filler wire—ensuring transparency, accountability, and peace of mind.
Welded to Withstand Alberta’s Harshest Conditions
EDEX weld procedures are built to perform under some of the most extreme weather conditions in North America. In Alberta’s sub-zero winters, welding integrity can be compromised by cold cracking and brittleness. EDEX welds are engineered with:
- Low-temperature impact testing in PQRs
- Strict preheat and interpass temperature controls
- Low-hydrogen consumables to avoid cold cracking
- Fracture-toughness controls for extreme climates
Sour Service Expertise
With decades of experience in Alberta’s sour gas fields, EDEX has developed weld procedures to meet the demands of hydrogen sulfide (H2S) service. Sour service precautions are integrated into the company’s welding standards:
- Compliance with NACE MR0175/ISO 15156 hardness limitations
- Standard post-weld heat treatment (PWHT) to reduce residual stress
- Specialized material selection and select weld chemistry to resist sulfide stress corrosion
- Strict surface preparation and environmental cleanliness controls
A Welding Program Designed for Industry
EDEX weld procedures include coverage for a wide variety of metals, including:
- Carbon Steel
- Chrome-Moly Alloys
- Stainless Steels (Ferritic, Austenitic, Duplex)
- Monel
- Copper-Nickel Alloys
- Nickel Alloys
- Titanium
- High-Temperature Casts (HK-40, HP-40, Paralloy, Kubota)
- Bi-Metallic Welding
Why EDEX Welding Leads the Industry
- Harsh Climate Performance – Proven weld integrity as reported impact testing results on applicable welding procedure specifications
- Sour Service Ready – Designed for H2S environments from day one
- Large-Scale Capability – Supporting some of North America’s largest pressure vessels and exchangers
- Precision and Quality Culture – Decades of expertise backed by rigorous Quality implementations and welding/welder development
Whether it’s a custom pressure vessel, field repair, or new fabrication, EDEX’s welding program delivers strength, safety, and long-term performance—built for industry, engineered for excellence.
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