The global Brazing Material
market is expected to witness significant growth over forecast year. Brazing
can be defined as the process by which two metal pieces are joint together with
third molten filler metal. The junction area of these metals is heated above
the melting point molten filler metal but below the melting point of other two
metals joined. There are many methods which are used for joining metal but
Brazing is mostly preferred over all the methods owing to its versatility. The
joints made by brazing process have enormous tensile power. The joints made by
brazing process have the capability to withstand shock, vibration and are
unaffected by normal change in temperature. These joints also repel gases. The
metals being joined are not distorted and wrapped and thus retain their
metallurgical properties.
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This process gives assembly
designer more scope in choosing material owing to fact that it is well suited
for joining two unalike metals. This process makes it easy to build complex
assemblies. The heat source for brazing process can be induction, furnace and a
hand held torch. There are various type of joints but brazers joints are mainly
classified in three categories that are lap joint, but-lap joint and but joint.
Induction heating is generally used to join the joints owing to its ability to
provide good quality joint, has reduced oxidation, hast fast heating cycle and
gives consistent result. Brazing process is done in three steps that are clean
the surface, flux the joints and then heat to red hot and add the third metal.
Brazing fluxes can be dissolvable,
water based and have ability to remove the oxides from the surface metals to
reduce the oxidation and promotes wetting of the surfaces to be joined. Choice
of brazing is taken by taking five factors into account that are as follows.
thickness of the joints, size of the parts to be joined, nature of base metals,
configuration of joint to be formed and number of joints to be made. Brazing
give leak proof and strong joints it is used to accumulate a vast assortment of
product ranging from aeronautics ,automotive, air conditioning systems ,
refrigeration systems, light bulbs, radiators, industrial valves , turbines,
jet engines, gas distribution team and other items that are exposed high
temperature ranges .Filler material for brazing process are available in
various forms that are wire, powder ,paste ,strips ,rods .In addition to which
there are variety of flux chemistry available to reduce the oxidation and to
improve the quality of joints. The three key trends that will be having
important impact over the brazing material market are operations under the
atmosphere of nitrogen using conveyor furnaces for the brazing of heat
exchanger, Operations under reduced atmosphere using conveyor furnaces for mild
steel assemblies and use of vacuums furnaces.
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