Benefit of HVOF & PTA Bimetallic Screw

Author: adminSource: Time: 2020-08-21 Hits: 642

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Q: What's bimetallic Screw?

A: Bimetallic screw means Bi-Metal screw, which screw is composed of 2 different metals, the base material with normal steel, and the wearing surface flight with higher strength alloy welded, which can be done by manuel welded, PTA welded or HVOF welded


Q: Difference between PTA & HVOF?

A: Varies in much area

- PTA is plasma argon arc welding, HVOF is high velocity oxyfuel spraying

- PTA is on screw flight top area only, while HVOF is on screw full surface

- Alloy used is different, PTA normally used is ni-based alloy with max.15% tungsten, while HVOF is tungsten-based alloy (tungsten above 80%)


Q: How is performance of both

A: PTA bimetallic screw offer acceptable wear resistance with more reasonable price, HVOF offer full surface protection to abrasion & corrosion with accordingly higher cost.


Q: How to choose

A: There is no absolute answer which one is best or not, meet your demand is the best for your choice, if you can't decide, leave it to our engineer