Hard facing, sometimes referred to as ‘Hard Surfacing’ or ‘Overlay Welding’, provides increased corrosion resistance to pipes, check valve seats and plates. Often this is required where a product is subject to hostile/sour environments resulting in significant wear/longevity issues e.g. oil & gas industry, mining, materials handling. Product failure is usually due to a combination of wear factors – mining bucket teeth are subject to abrasion and impact wear factors.
With in-house welding expertise and independent advice from The Welding Institute (TWI) we are able to provide advice on the best hard facing welding process, buttering layers, check cracking avoidance, consumable choice, maximum interpass temperature and pre/post heat treatment. We provide customers with a full array of Non Destructive Testing including DPI/MPI, ultrasonic, X-Ray via an independent third party approved supplier.
We predominantly use Stellite alloy arc welding electrodes creating a hard face layer of between 1.5 and 20mm thick. Stellite is a specific range of cobalt-chromium alloys designed for increased wear resistance. Other elements such as nickel, iron, aluminium, boron, manganese, phosphorus, sulphur, silicon, titanium, tungsten, molybdenum or carbon can be incorporated into the composition depending on the parent metal grade and the particular wear resistance required.
In certain applications we can re-apply a new hard facing to extend the life of the part. The hard facing is undertaken both in our workshop and on site. Following completion of works, the client is issued a full documentation pack which includes the welding procedure specification, consumables certificate, weld maps, heat treatment records and welder’s qualifications.
Repair rates are either based on term contracts, unit schedules or complete project cost.
To find out more about our capabilities please call the office or email email@example.com.
- Metallic (metal to metal)
- Austenitic Stainless Steels
- Carbon Steels
- Duplex Stainless Steels – Lean/Standard/Super Duplex
- Ferritic Stainless Steels
- Martensitic Stainless Steels
- Nickel/Chrome Alloys
- Stellite 1
- Stellite 6
- Stellite 12
- Stellite 21
- Nistelle Alloy C