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The process of joining two similar or
dissimilar, metals or non-metals, with or
without the application of heat, with or without
adding a filler material is known as welding.
The welding process can be divided into three
types.
1.
Fusion welding:
It is a process of joining two pieces of metals
by application of heat. The two pieces to be
weld are placed together, heated mostly with the
addition of some filler material, brought to the
melting temperature and solidify on cooling.
Various solid phase welding processes are
a)
Oxy-acetylene welding
b)
Shield metal arc welding
c)
Submerged arc welding
d)
Gas tungsten arc welding
e)
Gas metal arc welding
f)
Electro slag welding
g)
Plasma arc welding
h)
Electron beam welding
i)
Laser beam welding
2.
Solid phase welding: The two metals to be brought into contact to produce a metallic bond
with or without the application of heat, but
apply pressure for the plastic flow of the
metals.
3.
Plastic welding:
It is a process in which two metals to be joined is heated to the plastic
state and external pressure is applied without
the addition of filler material. Forge
welding, resistance welding and Thermit welding
with pressure are the examples of the plastic
welding.
There are mainly five types of welding joints.
a). Butt joint b) Lap joint c) T-joint d) Corner joint e)
Edge joint
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