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Plasma transferred Arc Cladding Process
The Plasma Transferred Arc method of welding takes advantage of
the ability to control the shape and direction of the plasma
plume used in all methods of electric arc welding.
The nozzle of the PTA torch is designed to channel a stream of
ionized gas into a carefully controlled point. Two types of
plasma torches are available, transferred and non-transferred
arc, see figure 1.
 
The transferred arc unit which provides a smaller more focused
weld pool. In this unit, a plasma arc is generated between the
torch tip and the work, and a metered flow of powder, suspended
in a stream of inert gas, is fed evenly into the weld pool. The
intense heat of the plasma plume liquefies both the powder and
the substrate and the two metals are welded to one another. The
amount of material deposited is controlled by the feed rate of
the powder hopper, and, as in traditional welding, a significant
quantity of material may be applied in one pass.
ENP PROCESS
 ENP
is an economical method for protecting any component which
cannot be protected by any
traditional process.
Electroless
Nickel (EN) deposits are used primarily to enhance the surface
performance properties.
Eelectroless
nickel plating produces an alloy deposit with unusual
properties. in terms of Corrosion
resistance, Electrical resistivity, Magnetic properties, Hardness, Wear esistance,
Temperature
resistance.
Uniformity
of the deposits.
EN
is deposited from solutions formulated with sodium hypophosphite
as the reducing agent. Results in
nickel films that are alloyed
with phosphorus.
mechanical
and physical properties of the EN deposits are free of micro
defects including microspores,
nodules, ductility and intrinsic
stress.
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