Why is plasma cutting machine working principle Better?

Plasma cutting which is a thermal cutting method, is widely used to cut or engrave on materials such as metals. This is one of the fastest cutting methods available that assures high-quality and precise cuts without causing any deterioration on the material. Although being a popular metal cutting technique, most of us are unaware of plasma cutting. Are you interested to know more about this metal cutting technique? This post is intended to provide you detailed information about plasma cutting machine. Stay tuned.

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What is Plasma?

To understand how a plasma cutter works, it’s important to know what plasma is. There are three fundamental forms of matter – solid, liquid, and gas. But, there is a fourth one as well, which is plasma. In daily lives, plasma can encounter in several products such as fluorescent lamps, televisions, and of course plasma cutters. Plasma is often called as an ionized gas because it can be generated by heating a natural gas to extreme temperatures or subjecting it to an electromagnetic field where the ionized gas element becomes electrically conductive. As a result, plasma cutters can pass through metals such as brass, aluminum, steel, and copper with no resistance.

Working Principle:

A Plasma Cutting Machine operates by using ionized gas (plasma) to cut through conductive materials. It involves a power supply, gas flow, plasma generation, a plasma torch, and the cutting process. The intense heat of the plasma melts the material, while the gas stream blows away the molten metal, creating the cut. Advanced systems may include CNC control for automated precision. This technology is widely used in industries like fabrication and metalworking for fast and accurate cutting.

How Does a Plasma Cutting Machine Work?

A Plasma Cutting Machine operates by using ionized gas (plasma) to cut through conductive materials. It involves a power supply, gas flow, plasma generation, a plasma torch, and the cutting process. The intense heat of the plasma melts the material, while the gas stream blows away the molten metal, creating the cut. Advanced systems may include CNC control for automated precision. This technology is widely used in industries like fabrication and metalworking for fast and accurate cutting.

Plasma cutting is one effective method to cut thin and thick materials. Owing to high speed and precision of cuts, this method is widely used in automotive repair and restoration, industrial construction, manufacturing, salvage and scrapping.

How to Use Plasma Cutting Machine Effectively?

So far, the previous section covered the working of plasma cutters. Now, let’s focus on how to make the best use of the tool.

1. Field Uses: There are a variety of sheet metal plasma cutters available in a wide range from inexpensive to high-end branded models. Most of them are performance-driven, and can exactly match your need. For field use, you will need a machine with approximately fifteen to twenty leads. So, you can fulfil your needs and still able to save on air and electricity.
2. Shop Uses: You can easily find sheet metal plasma cutters in shops. They can be used with computer numerical control (CNC) machines, and you’ll be amazed by the results. You can transform a raw sheet of steel into some incredibly designed work pieces. With plasma cutters, you can produce accurate cuts repeatedly; manually, it can be mundane and prone to errors.
3. Other Uses: Other usages of this tool vary based on different projects. This may include art installations, apartment renovations, and beyond. Additionally, sheet metal plasma cutter also makes your repair task easy by cutting a small piece of metal without taking you to the shop.

To get the expected quality and precise cut, it is important to choose the right plasma cutting machine from an industry-leading supplier like Woodward Fab. Browse the high quality Plasma Cutting Machine PL320, Cut up to 5/16″ Mild Steel. The company is a leading provider of sheet metal fabrication tools and equipment.

Browse the best selling Plasma Cutting Machine Product Range:

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Air plasma cutting is reserved for lower-reactivity metals such as stainless steel. However, it requires an electrode made from zirconium or hafnium to reduce oxidative destruction at the arc point.

Plasma cutting was first demonstrated by Dr. Robert Gage at Union Carbide in 1957 as a substitute for oxy-acetylene cutting. Later developments, particularly in the oil industry, allowed plasma cutting to be done underwater.

Where Is Plasma Cutting Being Used?

Shipbuilding, heavy machinery, construction, and military manufacturers all make extensive use of plasma cutting. The technology allows the fast and low-cost processing of large steel, stainless steel, and other metal components.

What Are the Advantages and Disadvantages of Plasma Cutting?

The advantages of plasma cutting are listed below:

1. Faster piercing than oxy-fuel and doesn’t require the pre-heat that oxy-fuel needs.
2. Cheaper to run than oxy-fuel per cut length.
3. Narrower, more precise cuts than oxy-fuel.
4. Reasonable thickness range — from ⅛ inch up to ¾ inch steel.
5. Simpler and less energy-intensive than similarly capable laser cutters. 
6. The equipment can be portable (for hand use).
7. Hand plasma cutting can be precise in skilled hands, though CNC plasma cutting is more reliable and precise.
8. Can be performed on a wide variety of materials and requires less setup and tuning than laser cutting.
9. Inherent safety feature: the power shuts off when the arc breaks.

The disadvantages are listed below:

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1. More limited in terms of part thickness than laser cutting. The gas stream remains less coherent with depth, making for larger kerfs than laser cutting.
2. Minimum part thickness is also limited. The initial part of the cut requires support to prevent it from becoming excessively violent and destructive.
3. The kerf is angled due to expansion in the gas stream. Perpendicular edges are not possible without post-processing (such as an angle-offset second cut).
4. Plasma cutting is dirty, noisy, and produces irritating dust.

What Are the Materials Plasma Cutting Can Cut?

Any conductive material can be cut with plasma, although the technique is rarely used on anything but metals and composites. A particular exception to this rule is semiconductor substrates, which can still accept plasma cutting. Examples of the most common materials are:

1. Aluminum
2. Brass
3. Carbon steel
4. Copper
5. Expanded steel
6. Mild steel
7. Stainless steel

How Much Does a Plasma Cutter Machine Cost?

Handheld plasma cutters are widely available for as little as $1,000 for a device of moderate capability. CNC plasma cutting systems, on the other hand, go for around US$30-50k for highly capable equipment.

How Does Plasma Cutting Work?

The plasma is formed by an electrical arc running from the cutter electrode to the workpiece. A (usually) inert gas stream confines the energy of the plasma to a small-diameter spot on the target material, immediately melting it. The vapor and melted material are then ejected by the gas stream, which also cools the target. The melt/ejection progresses rapidly through the target thickness in the form of a cut that widens with depth.

What Are the Safety Equipment When Plasma Cutting?

Personal safety gear is a must when plasma cutting. Hot splash and irritating dust get ejected violently from the cut. The process is also noisy, as the gas stream and arc are fast and energetic. The safety equipment for plasma cutting is listed below:

1. Goggles
2. Breathing filter
3. Coveralls
4. Gloves

General environmental safety gear is also required at most sites. Some examples are:

1. Signage to warn others of the process
2. Barriers to keep others away
3. Screens to block light and material splash

For more information, see our guide on Safety Gears when using Laser Cutters.

What Are the Best Alternatives for Plasma Cutting?

For most applications, the closest alternative process to plasma cutting is laser cutting. The methods are closely related in that they use directed energy to melt/vaporize the target material and a gas or air stream to clear debris. Plasma cutting was developed to replicate and improve on oxy-fuel cutting, a process that is still widely used as a simpler but low-precision alternative. For more information, see our guide on Alternatives to Laser Cutting.

Is it Possible to Cut Titanium With a Plasma Cutter?

Yes, titanium can be cut with a plasma arc. However, some additional precautions are required:

1. The splash is lightweight and highly energetic, so it can easily ignite nearby material. Remove all combustible materials and keep fire suppression equipment on hand. Shield the operator from splash.
2. Cut quality will be highest with an argon or argon/hydrogen gas stream. Nitrogen shielding gas will cause the cut quality to deteriorate. Air must not be used because it can easily allow ignition. 

Can a Plasma Cutter Cut Reflective Materials?

Yes, a plasma cutter can cut reflective materials. The albedo of the cutting target has no effect on the plasma arc since energy is imparted by ionized atoms rather than photons. 

What Is the Difference Between Plasma and CNC Plasma Cutting?

The difference between plasma cutting and CNC plasma cutting lies in the tools involved. Plasma cutting was first developed in the 1950s and 1960s as a hand-torch or simple pass-jig process. The advent of CNC machines in the 1960s and 1970s led to experiments with mounting a torch onto a CNC X-Y transport mechanism, allowing precise control and repeatability without requiring the same level of operator skill. For more information, see our guide on CNC Machining.

Summary

This article plasma cutting, explained what it is, and discussed the manufacturing process in detail. To learn more about plasma cutting, contact a Xometry representative.

Xometry provides a wide range of manufacturing capabilities, including plasma cutting and other value-added services for all of your prototyping and production needs. Visit our website to learn more or to request a free, no-obligation quote.

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