Screw flight to minimize wear in e.g. plastic extruders and plasticizing machines, includes alternating series of hard metal wear-protection regions and tough metal stress-relief regions along its flights

摘要

The screw flight (6) includes wear-protection regions (1) and stress-relief regions (2). An Independent claim is included for the method of making the screw, by attaching wear-resistant and stress-relief regions, especially by welding, spot welding, adhesion or brazing/hard soldering to the screw flights.