Brazing is a process that joins two or more metal surfaces by letting molten metal flow into the joint. The filler metal has a lower melting temperature than the parts to be joined to keep the workpieces from melting.<\/p>\n
Although brazing is one of the oldest joining methods, it is still used today for a good reason.<\/p>\n
Brazing joins metal surfaces together with a filler metal which has a low melting point. The process uses capillary action<\/a> wherein the homogenous liquid flow of the filler material bonds with the base metals.<\/p>\n A unique quality in the brazing process is that it keeps the mechanical properties of the metals which are useful in applications such as silver brazing or other similar metals.<\/p>\n One of the most crucial steps in the metal joining process is the cleaning of the base metal surfaces. Emery cloth or wire brush are both great tools to remove contaminants.<\/p>\n Having calculated joint gaps for the liquid filler metal to achieve surface tension with the workpiece, the brazing operation begins with properly positioning the assembly. A torch is normally used to slowly heat the workpiece’s metal surface and filler metal into its brazing temperature.<\/p>\n As the filler metal liquefies, capillary action lets it pass through the tight spaces, thus forming a bond between the surface of the base metals.<\/p>\n The brazed joints are formed as it cools down with the assembly.<\/p>\n These are the metals that are often joined by brazing:<\/p>\n Aluminium<\/p>\n<\/li>\n Cast iron<\/p>\n<\/li>\n Magnesium<\/p>\n<\/li>\n Copper and copper alloys<\/a><\/p>\n<\/li>\n Silver<\/p>\n<\/li>\n<\/ol>\n Once the molten flux and filler metal solidify, the brazed joint should possess the expected mechanical properties<\/a>.<\/p>\n<\/li>\n Brazing temperatures must efficiently achieve a proper liquid flow from the molten braze alloy into the joints.<\/p>\n<\/li>\n Filler metals must achieve proper wetting conditions in order to create strong bonds.<\/p>\n<\/li>\n<\/ol>\n Brazing Process<\/h3>\n
Materials<\/h3>\n
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Filler metal requirements<\/h4>\n
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