Welding guns use special copper alloy arms/adapters which function as electrode holders. They attach to the gun on one end and have a cap taper at the other for the electrode. They are frequently called cap adapters.
Offset holders are designed to allow one to reach into or over something on the part. They are designed to withstand most welding forces with very little flexing. Offset holders should be used in machines and set ups to minimize any other bending forces.
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