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VacuumFurnaces.com is a Q&A community where vacuum furnace product and service suppliers connect with commercial and captive heat treaters to share their practical skills and know-how and to establish valuable relationships around niche topics of expertise with vacuum furnace end-users in operations, production, training, maintenance, marketing, sales, and engineering.
It could be oxidation reducing the surface area and strength of the heating element over time. It could be arcing or shorting to ground. Impact from load carts, parts falling and/or someone bumping them accidentally of course