Research from: Joining of materials
Brazing
It is a joining process in which a filler metal is melted and distributed by capillary action
between the faying (contact) surfaces of the metal parts being joined. Base material does not melt
in brazing, only the filler melts.
In brazing, the filler metal has a melting temperature (liquidus) above 450°C, but below the
melting point (solidus) of base metals to be joined.
Advantages of brazing
Brazing can be used to join a large variety of dissimilar metals.
Pieces of different thickness can be easily joined by brazing
Thin-walled tubes & light gauge sheet metal assemblies not joinable by welding can be joined by
brazing.
Complex & multi-component assemblies can be economically fabricated with the help of
brazing.
Inaccessible joint areas which could not be welded by gas metal or gas tungsten arc spot or seam
welding can be formed by brazing.
A brazing filler begins with one of several common primary metals: silver, aluminum, gold,
copper, cobalt or nickel.
Brazing
Brazing is a joining process traditionally applied to metals (but also to ceramics) in which molten
filler metal (the braze alloy) flows into the joint.
The melting point of the filler metal is above 450°C, but always below the melting temperature of
the parts to be joined, which distinguishes the process from welding where high temperatures are
used to melt the base metals together.
The filler metal, while heated slightly above melting point, is protected by a suitable atmosphere
which is often a flux. The molten filler metal cools to join the workpieces together providing a
strong join between similar or dissimilar metals.
The atmospheres in which the brazing process can be undertaken include vacuum and other inert and
non-inert gases using a torch, furnace, and induction coil.
To achieve a sound brazed joint, the filler and parent materials should be metallurgically compatible,
and the joint design should incorporate a gap into which the molten braze filler can be drawn or
distributed by capillary action
Ideal for joining dissimilar metals, brazing is a commercially accepted process used in a wide range
of industries.
Brazing
It is a joining process in which a filler metal is melted and distributed by capillary action
between the faying (contact) surfaces of the metal parts being joined. In brazing, the filler metal
has a melting temperature above 450°C, but below the melting point of base metals to be joined.
Join produced by this welding is stronger than soldering. This process offers better corrosion
resistance. Filler used in brazing include Cu and Cu alloys, silver alloys and Al alloys. In this
process heating is done by torch, furnace, induction, resistance, bath dipping infrared techniques.
Advantages of brazing
Brazing can be used to join a large variety of dissimilar metals.
Pieces of different thickness can be easily joined by brazing
Thin-walled tubes & light gauge sheet metal assemblies not joinable by welding can be joined by
brazing.
Complex & multi-component assemblies can be economically fabricated with the help of
brazing.
Inaccessible joint areas which could not be welded by gas metal or gas tungsten arc spot or seam
welding can be formed by brazing.
Applications:
1)Automobile – Joining Tubes
2) Pipe/Tubing joining (HVAC)
3) Electrical equipment - joining wires
4) Jewelry Making
