As the material continues to expand in volume the pressures in the interface zone builds up, and material from the pipe and fitting intermingle. Once the current is stopped, the cooling process begins and the material will start to re-solidify. Given sufficient time, the melt will solidify and the melt pool will cool down in a way that the material will regain its flexibility and strength as they were prior to welding. Any handling, stresses or movement of the assembled pipe and/or fitting during the welding time or the cooling time may result in a reduced joint performance. Only after completion of the cooling time mentioned on the fitting can the clamping tools and all other surrounding equipment may be dismantled. For pressure testing, we recommend waiting a time equivalent to 4 X cool time mentioned on the barcode label before applying full test pressure.
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