The industry choice for weld metal overlay
Digester vessels are typically manufactured from carbon steel. Because of increased production expectations and environmentally driven process changes, these vessels suffer severe corrosion attack by cooking liquor. The Unifuse® vessel weld overlay technology was originally developed for the field installation of a fully fused, low dilution, corrosion-resistant cladding to mitigate this degradation process.
In continuous digesters, corrosion zones are easily identified with a periodic thickness mapping program. As critical wastage zones are identified, the Unifuse vessel overlay process is used to deposit a 309 or 312 stainless steel deposit. Because of the large size and short turnaround windows required for continuous digester plant maintenance, the industry-leading application production rates that are achieved using the WSI process offers our clients the best possible solution.
Because of their more aggressive corrosion environment, batch digesters typically require the use of 312 stainless steel as a protective deposit. One major difference between the WSI Unifuse process and other welded approaches offered in the industry is our patented duplex stainless welding technology, which eliminates the solidification cracking found in conventional 312 weld deposits.
Due to technical success and unparalleled return on investment, the industry chooses WSI Unifuse solution above all others. This has resulted in the largest installed base of weld metal overlay in the industry, and a solid reputation for safety, quality, and overall value.
Related Featured Story
WSI’s Patented Process for Machine Welding ER312ss in Batch Digesters
WSI’s proprietary GMAW machine welding process is ideal for ID applications, particularly digesters, because of the attractive economics proven versus other methods.
Boiler life extension solutions that are industry standards
Coke Drum Services
Industry leading life extension and repair processes to address low cycle fatigue failure
Heater & Furnace Services
Specialty machine welding solutions specifically configured to address difficult U-bend welds found in heaters and furnaces
Onsite solutions to restore the pressure boundary and reduce the effects of corrosion/erosion affecting nozzles in vessels
Pipe & Piping System Services
The largest provider of machine orbital pipe welding services for refineries, nuclear plants and fossil plants
Pressure Vessel Services
Permanent repair solutions that extend operational lifespan of a wide range of pressure vessels
Superheater, Reheater & Economizer Services
Over 30-year's experience in the protection of upper furnace components
World's largest installed base for the mitigation of fireside corrosion