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Photographic gallery.  Thousands of particles under the microscope.

Arc Spheres

When the arc occurs in the oil the metal is bright and smooth. If it occurs in air the surface of the particle will be a metal oxide. Arc spheres that have been in the transformer for a long time may corrode and show etching or corrosion deposits on their surface.

Copper Arc Spheres

Copper Arc Debris Etched Copper Arc Sphere

Silver Arc Spheres

Silver Arc Sphere

Aluminum Arc Spheres

Aluminum and Iron Welding Spheres

Iron Arc Spheres

Copper and Iron arcing Spheres