Hot plate welding is used for bonding thermoplastic materials and uses pneumatic, hydraulic or servo controlled machinery with a temperature controlled tooling assembly for welding plastic by induced heat. The hot plate tooling assembly consists of tool plates, adjustable part holding fixtures with vacuum and mechanical features for holding the parts, a heat platen with inserts and tooling stops to control the amount of melt and bond flow. The plastic parts are delivered by the part holding fixtures to the heat platen/insert assembly and the plastic interface is melted for a set amount of time and controlled depth to displace a desired amount of plastic from each side of the mating parts. Once the desired amount of melt is achieved, the parts are retracted from the heat platen/insert assembly by the part holding fixtures and the heat platen/insert assembly is withdrawn. After the heat platen/insert assembly is removed, both halves of the holding fixtures with the mating parts are brought together for a set amount of time allowing the parts to bond and cool under pressure.

Hot plate welding has been used to join complex shaped thermoplastic parts achieving high bond strength and hermetic welds. It is a common process used throughout industry for assembling plastic products.

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