Four process parameters were examined, namely the cutting speed, the cutting current, the plasma gas pressure and the distance of the plasma torch from the workpiece surface (cutting height).
What is the Pam over oxy acetylene cutting?
Plasma Arc Machining (PAM): The torch produces a high velocity jet of high-temperature ionized gas called plasma that cuts by melting and removing material from the work piece. It is used as an alternative to oxyfuel-gas cutting, employing an electric arc at very high temperatures to melt and vaporize the metal.
Which gas is used in Pam?
GASES USED IN PAM
| Sr. No. | Gas or Gas Mixture | Material to be Machined |
|---|---|---|
| 1 | Nitrogen – Hydrogen, Argon – Hydrogen | Stainless steel and non- ferrous metals. |
| 2 | Nitrogen – Hydrogen, compressed air | Carbon and alloy steels, cast iron. |
| 3 | Nitrogen, Nitrogen – Hydrogen, Argon – Hydrogen | Aluminium, Magnesium |
What is the maximum temperature of plasma arc cutting process?
28,000°C
Water injection plasma torch construction The plasma arc, which can reach temperatures of up to 28,000°C, is transferred to the workpiece, which is usually positive, where it “blows away” the molten metal. Energies of approximately 10kWh m-3 and thermal efficiencies of 85–90% can be achieved.
What are the two stages in plasma arc machining?
There are two types of Plasma Arc Machining (PAM) Systems such as Transferred Arc PAM system and Non-Transferred Arc PAM system. In Transferred Arc PAM system, Plasma arc is transferred between electrode and workpiece.
What is the principle of plasma arc machining What are the two stages in which the process of material removal is affected?
Working principle of Plasma Arc Machining PAM process uses ionized plasma to transfer heat. The plasma is obtained by forcing gas through an electric arc generated between cathode and andode. The high temperature plasma jet melts the metal and remove material from the workpiece.
What is plasma in Pam?
use in machine tools In machine tool: Plasma arc machining (PAM) PAM is a method of cutting metal with a plasma-arc, or tungsten inert-gas-arc, torch. The torch produces a high-velocity jet of high-temperature ionized gas (plasma) that cuts by melting and displacing material from the workpiece.
Why does gas formed in plasma do in Pam?
Plasma is generated by subjecting a volume of gas to electron bombardment of an electric arc. The anode heating due to direct electron bombardment plus convective heating from the high temp plasma raises the matl to the molten point and the high velocity gas stream effectively blows the matl away.
What is Pam process?
Basically, Plasma Arc Machining (PAM) is a metal cutting process where metals are cut with plasma arc, tungsten-inert-gas arc or a torch. It is mostly used for the metals that cannot be cut by an oxyacetylene torch. In PAM, different gases are used according to different material.
Which electrode is used in plasma arc cutting?
tungsten electrode
In the conventional system using a tungsten electrode, the plasma is inert, formed using either argon, argon-H 2 or nitrogen. However, as described in Process variants, oxidising gases, such as air or oxygen, can be used but the electrode must be copper with hafnium.
Is oxygen required for plasma cutting?
When it comes to plasma gas, oxygen is the industry standard for cutting mild steel because it provides the best, clean cut quality and fastest cutting speed of any plasma gas. (Plasma cutting aluminum plate or stainless plate with oxygen plasma gas is not recommended).
What is the temperature of a plasma cutter?
The heat of a plasma cutter can reach an impressive temperature of 25,000 degrees Celsius. To put this into perspective, it is hotter than the surface of the sun which sits at a comfortable 5,505 degrees Celsius. Safety is paramount when using a plasma cutter.
