RE: Using arc gun in place of PTA
Hi Steve, I assume you are the owner of the Screw Conveyor, and want to repair the part yourself. If this is the case, and you do not want to invest in HVOF, then you might consider welding or brazing. In the past years before PTA was available these screws were welded (and continue to be welded) using a variety of processes, but FCAW and GMAW or GTAW would be my choices. Check with a Hard Facing Product company like Eutectic or Welding Alloys or Deloro Stellite for the consumable.
If you are a job shop, then like Mr. Jewell says a HVAF or HVOF is good for this most of the time, if you can get good surface preparation on the component.
Good luck, and let us all know how it works out
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