This presentation aims on discussion of PAM process

1. Lecture Series
Advanced Manufacturing
Processes
www.engineersfirst.in

2.  A Plasma is defined as superheated &
electrically conductive gas.
 Principle
 When gas are heated to a temperature above
52000C they are partially ionized and exist in
the form of mixture of free electrons, this
mixture is called as plasma.
 In PAM high velocity plasma stream is
directed towards the work piece, thus
melting the work piece.

4.  A DC power supply
 A gas chamber
 A copper nozzle
 Tungsten electrode

5.  Negative terminal is connected to the DC
supply is connected to the electrode hence it
is cathode.
 While positive terminal is connected to the
copper nozzle & it forms anode.
 Tungsten electrode is fitted with the gas
chamber and nozzle is fitted to the bottom
of the gas chamber.
 A plasma is generated by subjecting a flowing
gas to the electron bombardment of an arc.
 For this arc is set up between the electrode
& nozzle.

6.  A gas is forced to this arc.
 A plasma flows through the water cooled
nozzle to direct the stream to the desired
location .
 Gases or water are often directed to
surround the plasma jet to help confine the
arc & clean the kerfs of molten metal
formed.

7.  High MRR than EDM & LBM
 Also suitable for electrically non conductive
materials.
 Suitable for plate thickness up to 150mm.
 The tool is in the form of plasma so non tool
wear .
 It cuts carbon steel about 10 times faster
than oxy-fuel cutting with due quality and
economically.
 This process is equally effective on any metal
regardless of its hardness.

8.  Required skilled operator.
 Expensive equipments.
 Emission of ultra violet & infra red
radiations.
 Metallurgical transformation in w/p due to
very high temperature.

9.  This process is extremely used for the profile
cutting of metals such as stainless steel,
aluminium, supper alloy plates which are
difficult to cut by oxyfuel techniques.
 In automotive, rail components
manufacturing.
 In nuclear and shipyard industries.

10. Thank You