Implant induction welding of thermoplastics
plastic manufacturing joining method
Implant induction welding is a joining method used in plastic manufacturing. The welding process uses an induction coil to excite and heat electromagnetically susceptible material at the joint interface and melt the thermoplastic. The susceptible material can be contained in a gasket placed between the welding surface, or within the actual components of a composite material. Its usage is common for large, unusually shaped, or delicate parts that would be difficult to weld through other methods.
Physical mechanisms
In non-magnetic electrical conductors like aluminum, nickel, or copper, an alternating electromagnetic field will induce Eddy currents in the material. These currents generate thermal energy through Joule heating. Ferromagnetic materials like iron and carbon steels will see heating from both Eddy current formation and hysteresis losses.
Welding process
Material considerations
Induction heating is an efficient method of heating electrically conductive or magnetic materials. Warm-up times are minimal and direct contact with the part is not needed. Unfortunately most thermoplastics are non-magnetic and excellent insulators.
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