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Classification and Composition of Brazing Alloys (GB5293-85)
Brazing alloys are used in the process of joining two or more components together to form a continuous unit using a filler metal that has a melting temperature lower than the melting temperature of the base metals being joined. Brazing is used for a number of reasons, such as to increase a joint’s strength or to repair damaged components. Brazing alloys are classified into four categories: fiber-reinforced alloys, silver-copper alloys, aluminum-magnesium alloys, and silver alloys.
1. Fiber-Reinforced Brazing Alloys
Fiber-reinforced brazing alloys are composed of at least 70 percent silver and no more than 10 percent copper. The remaining composition is made up of fibrous brazing material and flux material. These alloys are used for soldering and brazing thin sheets of metal or metal components with a high degree of precision.
2. Silver-Copper Alloys
Silver-copper alloys are composed of a controlled amount of silver and copper. These alloys are composed in a variety of percentages depending on the specific application, with a minimum of 45% silver and a maximum of 35% copper. The remaining composition includes other materials such as zinc, manganese, and tin. Silver-copper alloys have a low melting point and are used in many common applications, such as automotive, agricultural, and domestic repair.
3. Aluminum-Magnesium Alloys
Aluminum-magnesium alloys are composed of the two metals combined in various proportions, depending on the application. The primary purpose of these alloys is to increase the strength of weaker aluminum components without significantly raising the melting point. Aluminum-magnesium alloys are commonly used in die-casting and other automotive components.
4. Silver Alloys
Silver alloys are composed primarily of silver, with the remainder being made up of other components such as copper, zinc, and boron. Silver alloys are usually composed of at least 65% silver, but may contain as little as 45% silver, depending on the application. Silver alloys are used in a variety of applications due to their low melting points and high strength.
GB5293-85 is an internationally recognized standard that is used to classify brazing alloys. This standard is used to classify alloys according to their composition, as well as their application and strength. By adhering to the requirements outlined in GB5293-85, businesses and manufacturers can ensure they are using the best brazing alloys possible.
