How to test the welding quality of butt welding machine

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How to test the circuit connection of the butt welding machine? The video demonstrates the use of a clamp ammeter for this purpose.

#https://welpingtek.com/
#butt welder
#butt welding machine
#butt fusion machine
#fusion welding machine
#butt fusion welder
#thermofusion machine
#jointing machine
#thermofusion welding

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