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PTA (Bimetallic) Welding Types Screw

 
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Description

The welding process is performed with powder metal materials consisting of mixture of STELLIT 1, STELLIT 12, COLMONOY 56, COLMONOY 83, DELORO 55, and S-DW58.

This process is used for screw pitches where more rigid and more corrosion resistance surfaces are achieved. Comparative features are given as follows:

Screws with Armoured Flights (Bimetallic)

Material No Wear Resistance Corrosion Resistance Surface Hardness Thickness
Cobalt Based
Stellite 12 *** **** 47-49 HRC 2-2.5 mm
S-SM-50/52 **** **** 50-52 HRC 2-2.5 mm
Nickel Based
Deloro 55 *** **** 52-55 HRC 2-2.5 mm
S-DW-55/58 **** **** 55-58 HRC 2-2.5 mm

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