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High-frequency induction brazing welding theory knowledge and advantages

About high frequency brazing

High-frequency brazing refers to heating the weld to the temperature at which the alloy solder melts by heating, but at this time the welded metal still does not reach the melting temperature, and the low-melting alloy bonds the two metals together by strong surface tension. After cooling, a solid weld is formed.

The higher the frequency of high-frequency brazing, the smaller the current penetration depth. Although the surface layer is heated rapidly, the thickness of the heating is thinner. The inner part of the part can only be heated by the heat conduction of the surface layer to the inside. This is the so-called skin effect. .

High-frequency brazing is widely used for brazing steel, copper and copper alloys, stainless steel, high-temperature alloys and other symmetrical shaped weldments, especially for pipe fittings, pipes and flanges, shafts and bushings, turning heads Sawtooth welding; for brazing of aluminum alloys, induction brazing can also be used, but temperature control requirements are relatively high.


  Brazing

It refers to a welding method in which a metal material having a lower melting point than the base material is used as a brazing material, and the base material is wetted with a liquid brazing material and the interface gap is filled and diffused with the base material. The brazing deformation is small, the joint is smooth and beautiful, and it is suitable for welding precision, complex and components composed of different materials, such as honeycomb structural plates, turbine blades, carbide tools and printed circuit boards. Before the brazing, the workpiece must be carefully processed and strictly cleaned to remove oil and excessively thick oxide film to ensure the interface assembly gap. The gap is generally required to be between 0.01 and 0.1 mm.


High frequency welding

It is based on solid resistance heat. The resistance heat generated by the high-frequency current in the workpiece during welding causes the surface of the workpiece weld zone to be heated to a molten or near-plastic state, and then the forging force is applied (or not applied) to achieve metal bonding. Therefore it is a solid phase resistance welding method. High-frequency welding can be classified into contact high-frequency welding and induction high-frequency welding according to the way in which high-frequency current generates heat in a workpiece. When in contact with high frequency welding, high frequency current is transmitted to the workpiece through mechanical contact with the workpiece. In the induction of high-frequency welding, the high-frequency current generates an induced current in the workpiece through the coupling action of the external induction coil of the workpiece. High-frequency welding is a specialized welding method that requires special equipment according to the product. High productivity and welding speed up to 30m/min. Mainly used for the welding of longitudinal seams or spiral seams when manufacturing pipes.

 
 

Advantages of high frequency induction brazing machine

1. High-frequency induction brazing machine adopts MOSFET, IGBT power device and unique frequency conversion technology to provide higher reliability and durability, stable operation, high efficiency, energy saving and higher output power.

2. With constant current and constant power control function, it greatly optimizes the heating process of metal, realizes efficient and rapid heating, and the product superiority is greatly exerted;

3. Under the same conditions, it has twice the power saving effect of the traditional electronic tube high-frequency heating equipment, and has the effect of “small material and large use”, which can achieve twice the result with half the effort, while reducing the power load and power capacity increase and saving cost;

4. Select the power supply according to power and frequency. The higher the frequency, the shallower the heating depth, the lower the frequency, the better the heat permeability, which can be used for local welding;

5, the operation is simple and easy to understand, no professional personnel can also operate.


The above is the knowledge of the machine knowledge and related processes of high-frequency brazing in heat treatment shared by Haituo Electromechanical Xiaobian. I hope the above content will help you learn the brazing welding process.
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