Can I seam weld plastic with a resistance welder?

The definition of resistance welding is:

          Definition of Resistance Welding


That being said the heat is generated per "JOULES LAW"

                                                                       Joules Law

In order to make a seam weld current must flow through the desired joint area. As far as I know plastic is an electrical insulator and not able to pass current.  Therefore is not a candidate for resistance welding.

To my knowledge plastic is not being resistance welded.

I am aware of ultrasonic welding of plastics. This is frictional heat formed by ultrasonic movement and pressure.

Reference: RWMA Resistance Welding Manual 4th Edition

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