When failure isn’t an option and materials are unforgiving, you need welding that’s engineered, controlled, and fully traceable. ELK delivers specialist “exotic” welding for power and process environments — focusing on weld integrity, repeatability, and documentation that stands up to audit.
We support outage and on-line repair scopes involving high-alloy and non-standard materials where procedure control, heat input, consumables, and QA are critical.
What we mean by “exotic”
We typically class “exotic” as anything outside routine carbon steel / low-alloy work — materials where metallurgy, cracking risk, or service conditions demand specialist procedure and inspection.
Common examples include:
- Stainless steels (austenitic, duplex and super duplex)
- Nickel alloys (e.g., Inconel family and similar high-nickel alloys)
- High-temperature / creep resistant alloys (e.g., P91 / P92 and related chrome-moly steels)
- Dissimilar metal welds (DMWs) and transition joints
- Clad materials and overlay / buttering applications
- Specialist hardfacing and wear-resistant build-up (where required)
Typical plant applications
We’re routinely brought in for welding on:
- Boiler pressure parts: superheater / reheater / economiser tubing, headers and stubs
- HRSG / WHB systems: tube-to-header, manifold repairs, drain and vent modifications
- Steam systems: high-energy piping, spools, branch connections, valve interfaces
- Turbine / auxiliary interfaces: steam chests, bypass lines, attemperation pipework
- Balance-of-plant: chemical dosing lines, stainless pipework, corrosion-resistant systems
The problems we solve
Exotic welding is often triggered by issues like:
- Creep and thermal fatigue on high-temp pipework and headers
- Cracking at DMWs driven by metallurgical mismatch and operating cycles
- Hydrogen-related cracking risk on certain alloys if control is poor
- Repeat weld failures due to heat input, restraint, or PWHT issues
- Corrosion-driven repairs where material selection and procedure matter as much as the repair itself
How ELK controls quality (engineer-to-engineer)
Exotic welding isn’t “just a good welder” — it’s a controlled process. Our approach is built around:
Welding engineering and procedure control
- WPS alignment and verification (including special requirements for high-alloy work)
- Consumable selection, storage and issue control
- Heat input control and interpass management
- Joint prep and fit-up checks (including mismatch, root gap, and cleanliness)
- Purging strategy for stainless and nickel alloys (root protection)
Thermal management
- Preheat, controlled heat-up and cool-down practices
- PWHT coordination where required (including recording and traceability)
- Management of restraint and sequencing to reduce crack risk
Inspection and verification
- NDT planning to suit the material and failure mode (UT/PAUT, MT/PT, RT as appropriate)
- Weld profiling and acceptance criteria defined up front
- Dossiers built for statutory and client QA expectations
Services
We can support as a targeted capability or a full repair package:
- Tube and pipework repairs on high-alloy materials
- Dissimilar metal welds and transition spool installation
- Overlay / cladding repairs and corrosion-resistant build-ups
- Valve and nozzle interfaces in stainless / nickel alloys
- Outage support: welding supervision, weld maps, hold points, punch-list close-out
- RCA support for repeated cracking or metallurgical concerns (liaison with materials/NDT)
Deliverables you can file, audit, and reuse
We provide clear close-out documentation typically including:
- Weld maps, weld logs and traceability (where required)
- WPS/WPQR references, welder qualifications, consumable records
- NDT reports and inspection sign-offs
- PWHT charts / records (if applicable)
- As-built mark-ups and change notes
