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Do you know the skills of high frequency brazing and welding?

by:Kehua     2022-07-21
High-frequency brazing is a very common skill in the industry, and with the deepening of our country's infrastructure, the application of high-frequency brazing will become more and more frequent. See related information. High-frequency brazing High-frequency brazing High-frequency brazing refers to heating the weld to the melting temperature of the alloy brazing material by heating, but the metal to be welded still does not reach the melting temperature at this time, and the low melting point alloy passes through the strong surface The tension holds the two metals together, and when cooled, a solid weld is formed. With the development of space technology, rockets, missiles, aerospace, radar and other technologies, the microwave electronic traveling wave tube as a key device of the corresponding system is also constantly developing. Stainless steel materials have been widely used in the field of microwave electronics due to their good elasticity, thermal conductivity, and non-magnetic properties. In the microwave electronic traveling wave tube, especially in its high frequency system, a variety of stainless steel parts with complex shape, small size and precision are used. In practical applications, these stainless steel parts need to be connected by brazing. However, because the brazing of stainless steel parts is relatively poor, and the brazing of the parts must meet high strength, high vacuum air tightness and easy to achieve mass production Therefore, brazing of stainless steel parts has naturally become a key process in the manufacture of traveling wave tubes. To meet the brazing requirements, it is first necessary to solve the problem of which brazing method to choose. Selection of stainless steel brazing methods There are many brazing methods for stainless steel, such as flux brazing method, hydrogen filling brazing method, vacuum brazing method, etc. Although these methods can achieve the purpose of connecting parts, the analysis believes that these methods are not suitable for use. The reason is that the flux brazing will contaminate the inside of the device and it is not easy to remove; the adsorbed hydrogen is difficult to be absorbed by the getter in the tube, which brings the problem of incomplete degassing of the device; the vacuum brazing method requires the welding object and All around it is heated. For the small size of the traveling wave tube, this large-scale heating will directly damage the assembled components of the tube (such as ceramic and metal seals, slow wave lines, collectors, concentrated attenuation device, input, output components, etc.), resulting in a series of problems such as component deformation and ceramic explosion. High-frequency brazing The high-frequency brazing method uses the heat generated by the high-frequency current flowing through the metal to melt the brazing material and fill the gap between the parts to be welded, and form a non-removable joint after solidification. This method is particularly suitable for the mass production of small parts because it is to locally heat the welded parts and the heating speed is fast. High-frequency brazing of stainless steel is used for high-frequency brazing between metals. The brazed parts are connected by the molten solder that wets, fills the joint gap and solidifies. Therefore, the quality of the brazed joint is to a large extent. Depends on the properties of the solder. At present, in the manufacture of electric vacuum devices, there are many kinds of solders for high-frequency brazing metals. When choosing solders, it is usually considered that the melting point of the solder is at least about 60°C lower than the melting point of the metal to be soldered, which is lower than that of device baking and exhaust. The temperature or the temperature during aging and operation is higher than 100 ℃, and the solder should also meet the working requirements of the product, such as the mechanical properties (including strength and impact toughness at high temperature, room temperature or low temperature) and physical and chemical properties of the solder. (including electrical conductivity, thermal conductivity, oxidation resistance, corrosion resistance, etc.) requirements. It is estimated that you have already learned about high-frequency brazing through the introduction of the editor. High-frequency brazing has been successfully applied to many of our industrial sites, and it has also provided a more efficient working method for our national construction. If If you want to know more, then follow Kehua.
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