Plasma Transferred Arc Welding (PTAW) is a great process for robotic joining and overlay. The tightly columnated arc focuses the arc energy in a small area, making torch height less critical. The tungsten electrode is protected. So you change the tungsten less and weld more. PTAW allows the use of powdered filler materials, so you can weld all sorts of composite and exotic metals.

PTAW torches are bulky which limits you when working in confined spaces.

In this week’s episode, we were asked to replace a manual SMAW (stick) overlay application applying ER-CoCr A or Stellite (TM) in a confined space preheated to 400 degrees F.

With the right torch, this is a great candidate for automation and PTAW. Cobalt is expensive. We make welds very near final dimensions saving filler material and grinding time. And cobalt alloys are cheaper in powder form. Plus a robot doesn’t mind putting its arm into a 400 degree part nearly as much as a person does.

For more information on plasma welding see our Plasma Playlist:

Arc University:

Youtube Channel:

Thanks to Tom Daly with InterTest Inc. for the arc video camera.