What is plasma arc machining Pam?
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.
How is plasma arc generated 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.
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 mechanism of material removal in Pam?
When the gas is completely ionized, then the temperature of the central part of the plasma is between 110000C to 280000C. When such an ionized gas is directed on the workpiece through a high velocity jet, the metal is removed by melting.
What is Pam in manufacturing?
Meaning of Plasma Arc Machining (PAM): In this process heat for machining is produced by convection from the high temperature plasma as well as due to direct electron bombardment. This process is best suited for machining hard- to-cut metals such as super alloys, particularly during cutoff or rough slitting operations.
What are the process parameters of Pam?
Various process parameters of PAM are type of plasma forming gas and shielding gas, gas flow rate, gas pressure, arc current, arc voltage, cutting speed and stand-off distance or cutting height.
What is the Pam over oxy acetylene cutting?
Plasma Arc Machining (PAM): Temperatures in the plasma zone range from 20,000° to 50,000° F (11,000° to 28,000° C). It is used as an alternative to oxyfuel-gas cutting, employing an electric arc at very high temperatures to melt and vaporize the metal.
What do mean by plasma What are the advantages of Pam?
Following are the advantages of PAM that you must know: In Plasma Arc Machining, hard as well as brittle metals can be easily machined. It can be applied to almost all types of metals. The best part of this process is that we get high cutting rate.
What is plasma in machining?
When the gas or air is ionized its temperature reaches from 11000 °C to 28000 °C and this ionized gas is called plasma. The gas or air is heated with arc and the plasma produced by heating gas is used to remove material from the workpiece. So the whole process is called Plasma Arc Machining.
What are the applications of plasma arc machining?
Applications of Plasma Arc Machining This is chiefly used to cut stainless steel and aluminium alloys. Profile cutting of metals, especially of these metals and alloys, has been the common prominent commercial application of PAM.
What is plasma arc machining?
PLASMA ARC MACHINING D.PALANI KUMAR, Assistant Prof. / Mech. Engg., Kamaraj College of Engg. & Tech. Virudhunagar. 2. PRINCIPLE OF PLASMAARC MACHINING: •plasma is considered as the fourth state of matter, beside of the solid, liquid and gas states. when gas is heated to a high temperature of order 2000oC ,the molecules separate out as atoms.
What is a PAM Plasma torch?
PLASMA TORCH In PAM, electric arc constricts from nozzle, generates basic plasma jet. Instead of diverging into open arc, The nozzle constricts arc into a small cross section. the plasma arc are classified as.., 1. Air plasma torch 2. Dual gas plasma torch (plasma gas,shielding gas) 3. Oxyen injected plasma torch 4. Water injected plasma torch
What is the working principle of arc cutting?
4. Working principle Plasma arc cutting is a very complex process that is used in order to cut steel and other metals (or sometimes other materials) using a plasma torch. In this process, an inert gas is blown at high speed out of a nozzle.
What are the commercial applications of plasma as a cutting medium?
Profile cutting of metals, especially of these metals and alloys, has been the common prominent commercial application of PAM. On the machining side, plasma has been used successfully in conventional turning and milling of very difficult materials.