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Refurbishment of screws

We repair screws in following variants:

  • armoured screws STELIT
  • armoured screws STANDARD
  • armoured screws EXTRA
  • armoured screws EXTREM

Materials EXTRA and EXTREMwere specially designed for welding on extrusion and injection screws.

•    armouring of the upper part of the screw flight by using STELIT weld overlay – suitable for extrusion of clean materials

Diameter in mm           Lenght (max.) in mmWeld thickness in mmHardness
20 ÷ 75060001,5 ÷ 2,540 ÷ 50 HRC

•    armouring of the upper part of the screw flight by using STANDARD weld overlay

Diameter in mm           Lenght (max.) in mmWeld thickness in mm        Hardness
20 ÷ 75060001,5 ÷ 2,5900 ÷ 1000 HV

•    armouring of the upper part of the screw flight by using EXTRA weld overlay

Diameter in mm           Lenght (max.) in mmWeld thickness in mmHardness
20 ÷ 75060001,5 ÷ 2,550 ÷ 55 HRC

•    armouring of the upper part of the screw flight by using EXTREM weld overlay, armoured layer contains tungsten carbide grains  of high hardness up to 2400 HV 
     (30 % - 40 % in a welded on layer)

Diameter in mm           Lenght (max.) in mmWeld thickness in mmHardness
40 ÷ 75060001,5 ÷ 2,550 ÷ 62 HRC

 

               Methods of welding on of the armoured layers when renovating the screws

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