The thermal field inside the module is influenced by both the thermal power exchanged at the surfaces and by the thermal terms internally generated by the Peltier and the Joule effects
. The latter are determined through the thermoelectric and resistivity material characteristics; these in turn depend on the local temperature.
During an electrofusion welding process, several physical phenomena are coupled: heat flux generated by Joule effect
, heat transfer, polymer deformation, fusion and crystallization, and macromolecules interdiffusion.
The increase in modulus with heating is known as the Joule effect
. The weight rises because higher temperature excites rubber molecules in a way that tends to reduce distance between ends of molecules.