Induction Brazing Methods and Applications
Release time:
2023-02-08
【Summary Description】 Induction welding Induction Brazing Methods and Applications When induction brazing, the brazing part of the part is placed in an alternating magnetic field, and the heating of this part of the base metal is realized by the resistance heat of the induced current generated in the alternating magnetic field. The higher the frequency, the smaller the depth of current penetration, although the rapid heating of the surface, but the thinner the thickness of the heating, the internal parts can only rely on the surface layer to the internal heat conduction to heat, this is the so-called skin effect. It can be seen that the choice of high AC frequency is not beneficial, generally around the frequency is more appropriate. In addition, the skin effect is also related to the resistivity and permeability of the material, the greater the resistivity, the smaller the permeability, the weaker the skin effect, and the more significant the skin effect. The induction coil is an important component of induction brazing equipment. The basic principle of correct design and selection of induction coils is to ensure rapid, uniform and efficient heating during welding. Usually, the induction coil is made of pure copper tube. When working, the tube is cooled by water. The thickness of the tube wall should be less than the current penetration depth, generally 1~1.5mm. The gap between the induction coil and the weldment should be kept to avoid short circuit, but in order to improve the heating efficiency, the gap between the induction coil turns and the weldment should be minimized. Induction brazing often requires some auxiliary tools to clamp and position the weldment, in the design of the fixture should be noted that the clamp parts adjacent to the induction coil should not use metal, so as not to be induction heated. When induction brazing, foil, wire, powder and paste solder can be used. The solder should not form a closed ring, and the solder and gas medium can be used to remove the film. Induction brazing is widely used for brazing steel, copper and copper alloys, stainless steel, high-temperature alloys and other weldments with symmetrical shapes. It is especially suitable for pipe fitting, pipe and flange, shaft and shaft sleeve, turning tool cutter head sawtooth welding. For brazing of aluminum alloy, induction brazing can also be used, but the temperature control requirements are relatively high.
induction welding
Induction Brazing Methods and Applications
When induction brazing, the brazing part of the part is placed in an alternating magnetic field, and the heating of this part of the base metal is realized by the resistance heat of the induced current generated in the alternating magnetic field. The higher the frequency, the smaller the depth of current penetration, although the rapid heating of the surface, but the thinner the thickness of the heating, the internal parts can only rely on the surface layer to the internal heat conduction to heat, this is the so-called skin effect. It can be seen that the choice of high AC frequency is not beneficial, generally around the frequency is more appropriate.
In addition, the skin effect is also related to the resistivity and permeability of the material, the greater the resistivity, the smaller the permeability, the weaker the skin effect, and the more significant the skin effect. The induction coil is an important component of induction brazing equipment. The basic principle of correct design and selection of induction coils is to ensure rapid, uniform and efficient heating during welding. Usually, the induction coil is made of pure copper tube. When working, the tube is cooled by water. The thickness of the tube wall should be less than the current penetration depth, generally 1~1.5mm. The gap between the induction coil and the weldment should be kept to avoid short circuit, but in order to improve the heating efficiency, the gap between the induction coil turns and the weldment should be minimized. Induction brazing often requires some auxiliary tools to clamp and position the weldment, in the design of the fixture should be noted that the clamp parts adjacent to the induction coil should not use metal, so as not to be induction heated.
When induction brazing, foil, wire, powder and paste solder can be used. The solder should not form a closed ring, and the solder and gas medium can be used to remove the film. Induction brazing is widely used for brazing steel, copper and copper alloys, stainless steel, high-temperature alloys and other weldments with symmetrical shapes. It is especially suitable for pipe fitting, pipe and flange, shaft and shaft sleeve, turning tool cutter head sawtooth welding. For brazing of aluminum alloy, induction brazing can also be used, but the temperature control requirements are relatively high.
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