What is Brazing in Welding?

Brazing is a welding process that produces coalescence of materials by heating them to a suitable temperature and by using a filler metal, having a liquidus above 840 øF (450 øC) and below the solidus of the base materials. The filler metal is distributed between the closely fitted surfaces of the joint by capillary attraction.

Brazing is distinguished from other welding processes by its use of a non-ferrous filler metal that melts at a lower temperature than the base metals being joined. The brazing temperature must be above 450°C (840°F), but below the melting point of the base metals being joined. Commonly used alloys for brazing mild steel have melting points ranging from 1020-1070°C (1868-1958°F).

The most common brazing processes are torch brazing and furnace brazing. In torch brazing, a fuel gas (usually acetylene) and oxygen are used to heat the filler metal to its melting temperature. In furnace brazing, the filler metal is heated in a furnace to its melting temperature and then conveyed to the joint by means of a ceramic rod or another transfer device.

What is brazing used for?

Brazing is often used to join dissimilar metals, such as joining copper tubing to steel or aluminum components. It can also be used for joining ceramics to metals.

What are the advantages of brazing?

The main advantage of brazing is that it can be used to join dissimilar metals. Brazed joints also have high tensile and shear strength.

What are the disadvantages of brazing?

The main disadvantage of brazing is that it requires clean, well-prepared surfaces before the joint can be made. The surfaces must be free of dirt, grease, oxides, and other contaminants. If the surfaces are not clean, the filler metal will not wet properly and the joint.

What is the difference between welding and brazing?

The main difference between welding and brazing is that in welding, the base metals are melted and joined together, while in brazing, a filler metal is used to join the base metals. Brazing can be used to join dissimilar metals, while welding cannot.

What is brazing VS soldering?

The main difference between brazing and soldering is that the brazing temperature must be above 450°C (840°F), but below the melting point of the base metals being joined. Soldering, on the other hand, is a joining process in which two pieces of metal are joined together by melting a lead-based solder at a temperature below 450°C (840°F)