What is the working principle of plasma arc machining?
In the plasma arc machining process, the material is removed by directing a high-velocity jet of ionized gas at high temperatures (11000 ° C to 28,000 ° C) on the workpiece. This high-temperature plasma jet melts the contents of the workpiece.
What are the process parameters of plasma arc machining?
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 are the 2 types of primary plasma arc cutting processes?
There are two types of Plasma Arc Machining (PAM) Systems such as Transferred Arc PAM system and Non-Transferred Arc PAM system.
What are the applications of plasma arc machining?
APPLICATIONS
- It is used for cutting alloy steels, stainless steel, cast iron, copper, nickel, titanium, aluminum, and alloy of copper and nickel, etc.
- It is used for profile cutting.
- It is successfully used for turning and milling of hard to machine materials.
What are the advantages of plasma arc machining?
Advantages of Plasma Arc Machining
| Nr. | Advantages of Plasma Arc Machining |
|---|---|
| 1 | Plasma arc machining can be used on difficult materials |
| 2 | The use of plasma keeps cutting the workpiece free from contact of the gun |
| 3 | Workers are more productive and have increased accuracy |
What is the value of voltage used in plasma arc machining?
Explanation: The value of voltage in the Plasma beam machining processes is about 30 – 250 V.
Which gas is used in Pam?
Using plasma arc melting, the metal is melted under inert gas atmosphere (usually Helium or Argon) in a pressure range between 400 – 1,200 mbar abs. The plasma arc torch column provides the heat source with maximum temperatures well above 15,000 K.
What are the advantages and disadvantages of ECM?
Advantages and disadvantages of electrochemical machining
- The rate of machining does not depend on the hardness of the work piece material.
- The tool does not wear.
- No stresses are produced on the work piece surface.
- No burrs form in the machining operation.
- High surface quality may be achieved.
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.
What are three dangers of plasma cutting?
What are the dangers of plasma cutting? here are a few dangers: electrical risks, damage of your eyes and the danger of breathing in metal dust and other debris kicked up from the interaction between the plasma and the metal on which you’re working.
What are the limitations of plasma arc machining?
Disadvantages of Plasma Arc Machining:
- The equipment used in Plasma Arc Machining are very costly.
- Metallurgical changes take place on the surface of the workpiece.
- The consumption of inert gas is high.
- As oxidation and scale formation takes place, shielding is required.
What are the advantages and disadvantages of plasma arc machining?
Disadvantages of Plasma Arc Machining
| Nr. | Disadvantages of Plasma Arc Machining |
|---|---|
| 2 | The equipment is extremely expensive and difficult to fix or repair |
| 3 | Plasma arc machining has a high gas consumption |
| 4 | It is not great for use on big products due to costs |
| 5 | Heat and fumes could damage the workpiece |
What is plasma arc machining?
The principle of plasma arc machining is shown in the figure. In a plasma torch, known as the gun or plasmatron, a volume of gas such as H2, N2, 02, etc. is passed through a small chamber in which a high-frequency spark (arc) is maintained between the tungsten electrode (cathode) and the copper nozzle (anode), both of which are water-cooled.
Can plasma be used for machining of any metal?
The heating of workpiece material is not due to any chemical reaction, but due. to the continuous attack of plasma on the workpiece material. So, it can be safely used for machining of any metal including those which can be subjected to the chemical reaction.
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.
How does a plasma torch work?
In a plasma torch, known as the gun or plasmatron, a volume of gas such as H2, N2, 02, etc. is passed through a small chamber in which a high-frequency spark (arc) is maintained between the tungsten electrode (cathode) and the copper nozzle (anode), both of which are water-cooled.