High frequency welder is different from other welders because it is not just used to welding. High frequency welder is not only used to welding various metal materials but also used to diathermancy, smelting, thermal treatment and other technologies. So welding is one of numerous applications of it.
How does a high frequency welder work? At first, there is a whole set of unique electronic circuit in it which converts low-frequency alternate current (50Hz) inputted from the grid to high-frequency alternate current (generally over 20000Hz). After appended to inductance coils, high-frequency current converts into high-frequency magnetic field with the principle of electro-magnetic induction, and at the same time acts on the metal objects in the magnetic field. Besides, through the eddying effect, induced current proportional to the magnetic field strength occurs in the metal objects. Being affected by skin effect, the higher the eddy’s frequency is, the the more concentrated on the surface layer of the metal objects. When flowing in the metal objects, according to the current’s heating effect theory, the eddy will produce heat by means of the inner inherent resistance. Because this kind of heat is directly produced inside the object, heating rate is so quick and the efficient is so high that metal objects can be fused in a moment. What’s more, the heating rate and temperature is controllable.
In conclusion, high frequency welder is specially suitable for heat treatment quenching, annealing, metal hot forging, extrusion molding, solder welding and so on.
