deutsch   english   français   Български   magyar   türkçe   română   русский  


We regenerate worn-out screws and cylinders

Screws or cylinders that have reached their wear boundary should be put into the hands of WAFO. We have 25 years experience in regenerating worn parts.

With the screws, we firstly remove the worn-out basic material. Then new helical threads are made by task welding of a specific, high wear resistant armouring alloy. For specific cases it is also possible to armour screw core as well as the flanks. By subsequent truing, grinding and polishing the screw receives its final geometry. In this way it is better protected against wear as conventional, new, nitrated screws.

Armouring is mostly more economical than a new screw. And - a crucial asset is the improved endurance.

If screw and cylinder are simultaneously regenerated, the possibility exists mostly with the cylinder of nitrate steel to hone and afterwards to do intense nitrating.

The increased cylinder diameter due to honing is taken into account by us when regenerating the screw, screw and cylinder fit together again afterwards.

For bushing we, drill-open the worn-out cylinders. In one from us developed processes we put in a wear resistant bush - firm and twist safe. The cylinder receives again its initial diameter, and you can again employ a screw with original diameter.

As material for the bush one can choose between chromium steel, particularly wear resistant and corrosion-resistant powder metallurgical materials or bi-metals.

WAFO-System Technology

Screw regeneration in 4 weeks
The 4 aces of WAFO
Highest quality Short delivery times
  • reproducible armour plating with PTA automatic welders
  • multiplayer system armouring
  • Collection and delivery through are own lorries
  • down time of your machine as agreed upon, therefore no substitute armaments necessary
Low Prices Optimal service
  • High degrees of automation in the manufacturing
  • free wear and material analysis
  • comprehensive customer support
PTA welding

WAFO-System Technology

The answer from WAFO with screw wear
Since 1997 we have a modern screw service centre, to enable screw regenerations with increase in value through abrasion resistant top surface armouring in the shortest processing time.
For the welding process we use a CNC controlled plasma powder welding plant (PTA) of the newest aggregate generation. The process allows qualitative high quality and reproducible top surface, flanks and full armouring.
The mechanical processing of the renewed screws occurs partially on self- developed machines.

WAFO screw armouring material
Qualities Material Type
St 6 St 12 St 1 Colmonoy 56 WP 88
Delivery Co-Cr-W Co-Cr-W Co-Cr-W Ni-Cr NiCr+WC
Hardness of the armouring HRC 38-42 43-49 48-55 48-53 56-60
abrasive resistance * * * * * * * * * * * * * * *
corrosion resistance * * * * * * * * * * * * * *

Relative abrasion with pairing:
Screw St 6 St 12 St 1 Colmonoy 56 Colmonoy 56 WP 88
Cylinder WA5 WA5 WA5 WA77 WA880 WA880
Screw * * * * * * * * * * * * * * * * *
Cylinder * * * * * * * * *

Further armouring materials and special surfaces on request!
StelliteŽ ist eine Handelsmarke der Deloro Stellite Holdings Corporation

Standard Terms and Conditions for the Sale and Production of Goods
Diese Seiten werden gewartet von:
Matthias Brenner, Dipl.Phys. | E-Mail: |
Programmierung von Jürgen Ernst, Dipl.Ing. (FH) |
Aktualisiert am: 09.01.2014