Plasma is the ionized state of gas atoms. When an ionized gas passes through the electric current, it becomes mixture of ions, electron and highly excited atoms. Thus the energy of plasma and the temperature is dependent on the amount of the electrical power employed. A tremendous amount of temperature is obtained from plasma torch is about 500000F.
There are two types of inert gas is employed for plasma welding process, one formed the plasma and other is shielding the plasma.
Principle of plasma welding
There are two types of plasma arc torch is used, 1. Transferred arc torch, 2. Non-
In the non transfer arc process the arc is produced between the tungsten electrode (-
In the transferred arc process is also an arc is produced between the work piece (+) and electrode (-
process the produced arc is transferred electrode to work piece. It has extraordinary power of plasma arc, which posses high jet velocity and high plasma density. By this facility, it is used to cut and weld the metals. Which metals we can not cut by means oxy-
Advantage of plasma welding :
# It has excellent type weld quality.
# Arc is stabilized.
# It needs very simple type’s fixture.
# Root welding does not required.
# Penetration is uniformed.
# It produces radio-
Application of plasma welding
# Nuclear submarine pipe welding.
# Cryogenic and aerospace component welding.
# Nickel and high nickel alloy welding.
# Melting the high melting point temperature metals.
# Titanium plate welding up to 8 mm thickness.
# Welding the stainless tubes up to 1/4” thickness.