• Regen­er­a­tion of cylin­ders

Screw regen­er­a­tion in 4 weeks

Highest quality
  • Repro­du­cible armour­ing with PTA welding machines
  • Multi-layer system armour­ing
Lower prices
  • High level of auto­ma­tion in produc­tion
Short delivery times
  • Collec­tion and delivery by our own lorries
  • Decom­mis­sion­ing of your machine at the agreed time, there­fore no replace­ment set neces­sary
Optimum service
  • Free wear and material analyses
  • Compre­hens­ive customer support

WAFO's answer to screw wear

Since 1997, we have had a modern screw service centre at our disposal to enable us to regen­er­ate screws with increased value through wear-resist­ant web armour­ing in the shortest possible processing time.
We use a CNC-controlled plasma powder welding system (PTA) of the latest gener­a­tion for the welding process. The process enables high-quality and repro­du­cible web, flank and solid armour­ing.
The mech­an­ical processing to new worm condi­tion is carried out on machines, some of which we developed ourselves.

WAFO screws Armour­ing mater­i­als
Char­ac­ter­ist­icsMaterial type
 Stellit 6Stellit 12Stellit 1Colmonoy 56WP 88
Hardness of the armour HRC38-42 43-4948-5548-53 56-60
Wear resist­ance✪✪✪✪✪✪✪✪✪✪✪✪✪✪✪
Corro­sion resist­ance✪✪✪✪✪✪✪✪✪✪✪✪✪
Relative wear during assembly
ScrewStellit 6Stellit 12Stellit 1Colmonoy 56Colmonoy 56WP 88

Other armour mater­i­als and special surfaces on request!
Stel­lite® is a trade­mark of Deloro Stellite Holdings Corpor­a­tion.

The WAFO special armour

The bar armour­ing first used by WAFO as a pioneer 30 years ago has become estab­lished world­wide over the years.

The mater­i­als we use, Stellite, have proven them­selves in thou­sands of WAFO recon­di­tioned screws.

But nothing is so good that it cannot be improved. Our answer to this chal­lenge is WT 50, an armour material that produces even better results in special cases. WT 50 is an armour material specially adapted by WAFO. Special armour­ing
This material consists of a very hard and there­fore very wear-resist­ant inter­metal­lic compound, which is embedded in a soft nickel matrix. This alloy is char­ac­ter­ised by excel­lent sliding prop­er­ties and very good corro­sion and wear resist­ance over a wide temper­at­ure range.

The hardness is around 50 HRC. We also use our armour material WT 60 as a supple­ment to this.

This is a cobalt-based material with the same prop­er­ties as our WT 50, but with a hardness of approx. 58 HRC.

Thanks to a special plasma welding system, we are able to apply highly wear-resist­ant armour­ing with a Ni-Cr matrix and a high propor­tion of extremely hard tungsten carbides to screws.