Induction brazing

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Business cardholder.Different design for the different people.To show your taste. Ch 087 Card Holder moAnd you can see more from rice paper lantern red wine holder remote led lantern clear badge holder electronic tiescarfbelt holders 5 light candelabra dessert gel candles money tree candle dual sim holder Brazing is when two or more unlike materials are joined together by a filler metal that has a lower melting point. Many heat sources can be used, but this article will describe brazing with induction heating. In induction heating, usually ferrous materials are heated rapidly from the electromagnetic field that is created by the alternating current from an induction coil.Contents1 Materials/Application 2 Benefits 2.1 Selective heating 2.2 Better quality joints 2.3 Reduced oxidation and cleaning 2.4 Fast heating cycles 2.5 Consistent results 3 General temperatures and times 4 Notes 5 References 6 External Links // Materials/Application"Induction brazing is suitable for many metallic materials, with magnetic materials being heated more readily. Where ceramic materials are involved, heating will most likely occur by conduction from surrounding metallic parts, or the use of a susceptor" (Sue Dunkerton, 1).According to Ambrell Group Application Labs talking about filler metals: Silver is frequently used for induction brazing because of its low melting point. Silver-copper eutectic brazes have melting temperatures between 1100 and 1650. Aluminum braze, the least common, has a melting temperature of 1050 to 1140. Copper braze, the least expensive, has a melting temperature of 1300 to 2150. (p1)The filler can be manually applied but because of the more common semiautomatic production a preloaded joint is more commonly used to speed the operation and help to keep a more uniform bond.BenefitsAccording to Turnkey Induction Heating Solutions: There are very specific reasons to use induction heating for industrial brazing. These include selective heating, better joint quality, reduced oxidation and acid cleaning, faster heating cycles, more consistent results and suitability for large volume production.Selective heatingInduction heating can be targeted to provide heat to very small areas within tight production tolerances. Only those areas of the part within close proximity to the joint are heated; the rest of the part is not affected. Since there is no direct contact with the part, there is no opportunity for breakage. The life of the fixturing is substantially increased because problems due to repeated exposure to heat (such as distortion and metal fatigue) are eliminated. This advantage becomes particularly important with high-temperature brazing processes.With efficient coil design, careful fixturing and consistent part placement, it is possible to simultaneously provide heat in different areas of the same partBetter quality jointsInduction heating produces clean, leak proof joints by preventing the filler from flowing in areas that it shouldn't. This ability to create clean and controllable joints is one of the reasons that induction brazing is being used extensively for high-precision, high-reliability applications.Reduced oxidation and cleaningFlame heating in a normal atmosphere causes oxidation, scaling and carbon build up on the parts. To clean the parts, applications of joint-weakening flux and expensive acid cleaning baths have traditionally been required. Batch vacuum furnaces solve these problems, but have significant limitations of their own because of their large size, poor efficiency and lack of quality control. Brazing with induction reduces both oxidation and costly cleaning requirements, especially when a rapid cool-down cycle is used.Fast heating cyclesBecause the induction heating cycle is very short in comparison to flame brazing, more parts can be processed in the same amount of time, and less heat is released to the surrounding environment. n induction brazing system quickly delivers highly localized heat to minimize part warpage and distortion. Brazing in a controlled vacuum or in an inert protective atmosphere can significantly improve overall part quality and eliminate costly part cleaning procedures (Induction Atmospheres, 1).Consistent resultsInduction brazing is a very repeatable process because variables such as time, temperature, alloy, fixturing, and part positioning are very controllable. The internal power supply of the RF power supply can be used to control cycle time, and temperature control can be accomplished with pyrometers, visual temperature sensors or thermocouples.For processes, which involve medium to high production runs of the same parts, an automated part handling system is often utilized to further improve consistency and maximize productivity. For the most part, induction brazing and soldering is done in an open-air environment but it can also be done in a controlled atmosphere when necessary to keep the parts completely clean and free of oxidation. Induction brazing generally works best with two pieces of similar metal. Dissimilar metals...(and so on)


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