Plasma arc cutting is a metal cutting process that uses a high-speed jet of heated gas to cut metals. It works by forming an electric arc from a torch nozzle to the metal surface, turning the gas into a plasma that melts the metal. The plasma is hot enough to melt the metal and moves fast enough to blow the molten metal away. It can cut a variety of metals quickly at a lower cost than other methods but requires more expensive equipment and operator skill compared to oxy-fuel cutting.

1. Group No. 2 : Mohd Shafwan
Aqil Fikry
Nurul Jannah
Farzana Afiqah

2. Contents:
• Int roduc t i on
• P nc i pl e of
ri
Operat i on
• Advant ages
• D s advant ages
i

3. Introduction
• Plasma arc cutting is a process that is used to cut steel
and other metals of different thicknesses using plasma
torch.
• In this process, an inert gas (compressed air) is blown at
high speed out of a nozzle; at the same time an electrical
arc is formed through that gas from the nozzle to the
surface being cut, turning some of that gas to plasma.
• The plasma is sufficiently hot to melt the metal being cut
and moves sufficiently fast to blow molten metal away
from the cut.

4. Principle of Operation
• The plasma is tied up by a water-cooled nozzle because of the high
temperature, the plasma expands and flows with supersonic velocity
speed to the workpiece.
• Inside the plasma arc, temperature of 30000 ᵒC can arise, that realize in
connection with the high kinetic energy of the plasma beam and
depending on the material thickness very high cutting speeds on all
electrically conductive materials.
• In this process, the stability of arc is needed to keep the plasma in desired
form.
• For cutting process, first of all a pilot arc ignition by high voltage between
nozzle and cathode takes place.
• This low-energy pilot arc prepares by ionization in parts the way between
plasma arc are touches the workpiece (flying cutting, flying piercing),the
main arc will start by an automatic increase in power.

5. ADVANTAGES
• Low cost alternative to oxy-fuel and laser profiling.
• More versatile and accurate option.
• Rapid cutting speed.
• Wide range of material and thickness – can yield quality cuts
on both ferrous and non-ferrous metals.
• Easy to use – only require minimal operator training.
• Economical than oxy-fuel for thickness under 25mm and
comparable up to about 50mm.

6. DISADVANTAGES
• High equipment expense.
• Need more operator skills.
• Complex welding procedures.
• Producing heavy noise level.
• Producing higher ozone production.

7. DISADVANTAGES
• High equipment expense.
• Need more operator skills.
• Complex welding procedures.
• Producing heavy noise level.
• Producing higher ozone production.