Introduction to Brazing By Layne Taylor
Brazing u. What is brazing? u. The bonding of two metals by use of a non ferrous (does, not contain Iron) alloy that melts above 840 degrees F. u. Soldering is the bonding of two metals by use of an alloy that melts below 840 degrees F.
Advantages of Brazing u Done at a lower temperature so there is less warping. u Easy disassembly & realignment of parts. u Allows different types of metals to be joined. u Allows metals of various thickness to be joined. u Creates a leak proof joint.
Brazing Alloys u. Copper u. Zinc u. Tin u. Aluminum u. Beryllium u. Magnesium u. Silver u. Gold
Brazing Alloys u. Brass: Consists chiefly of copper and Zinc. u. Bronze: Consists chiefly of copper and tin. u. Most brazing rods are made out of brass.
Bonding u. How does bonding occur? u. Bonding occurs through the process of adhesion. u. Adhesion is the molecular attraction of two unlike molecules.
Bonding u. Brazing is done on metals that fit together tightly. The molten metal enters the joint by capillary action. u. Capillary action is a physical process in which a liquid is drawn into the space between two tightly fitted surfaces. u. Brazing joints should be designed for this purpose.
The process of brazing u. The metals must be cleaned thoroughly to remove all the dirt, Oil, grease & oxides from the steel. This can be accomplished both chemically and mechanically. u. Chemical Cleaning: Oil and grease need to be removed with a solvent.
The process of brazing u. The metal is heated to a temperature slightly above the melting temperature of the filler rod but below the melting temperature of the steel (1000 Degrees or dull red) u. Flux is added to hinder the formation of and dissolve oxides in or on the metal.
The process of brazing u. Usually a neutral flame is used. A slightly carburizing flame will produce a exceptionally neat-looking weld but strength will be sacrificed. u. Enough filler rod should be applied to completely penetrate 100% of the joint. u. The metal should be cooled properly.
The process of brazing