高频热合机又称高频塑胶熔接机，高周波高周波塑胶熔接机等。它与高频感应加热机(高频感应加热设备、高频电源等)，均可简称为高频机。
High-frequency hot-bonding machine is also called high-frequency plastic welding machine, high-cycle high-cycle plastic welding machine, etc. It and high frequency induction heater (high frequency induction heating equipment, high frequency power supply, etc.), can be referred to as high frequency machine.
高频感应加热机，主要用于金属的加热。它是利用电磁感应原理、涡流现象、电流热效应及高频趋肤效应等，使处于其高频电磁场中的金属材料，迅速被加热。
High frequency induction heater is mainly used for metal heating. It uses electromagnetic induction principle, eddy current phenomenon, current thermal effect and high frequency skin effect to make metal materials in its high frequency electromagnetic field heated rapidly.
高频热合机，主要是用于塑料的加热。它利用高频电场使塑料内部分子形成振荡，进而产生热能实现对各类塑料制品的加热。
High frequency heat closing machine is mainly used for plastics heating. It uses high-frequency electric field to oscillate the internal molecules of plastics, and then generates heat energy to heat various plastics products.
高频热合机的工作原理:高频电场作用于处于其电场中的塑料材料，使其发生分子极化现象，这些被极化的分子被按电场方向进行强行排列。高频电场的快速变化，便使这些分子以同样极快的速度跟随变化。从而使该介质材料因介电损耗产生大量的热量。这些热量聚集、积垒会形成很高的温度，最终将它熔化。
The working principle of high frequency thermal closing machine: high frequency electric field acts on the plastic material in its electric field, causing the phenomenon of molecular polarization. These polarized molecules are arranged forcibly according to the direction of electric field. The rapid change of high frequency electric field makes these molecules follow the change at the same speed. Therefore, the dielectric material will generate a lot of heat due to dielectric loss. These heat accumulates and builds up barriers at very high temperatures, which eventually melts them.