What is Plasma Cutting and How Does it Work?

WRITTEN BY: ROB ROSSETTI

Plasma cutting is a modern way to cut through different types of metal with a lot of precision.

It’s become a popular method in workshops and industries around the world.

But what exactly is plasma cutting, and how does it work?

In this article, we’ll explain the basic ideas behind plasma cutting and why it’s such a useful tool for cutting metal.

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Key Takeaways

• Plasma is the fourth state of matter and is created when a gas is heated so much that it turns into charged particles. This makes it able to conduct electricity and create extreme heat, which is why it’s useful for cutting metal.

• Plasma cutting works by using a torch to create a super-hot stream of plasma that melts metal and blows it away in a clean, narrow cut. It’s fast, precise, and doesn’t need the torch to touch the metal.

• You can use plasma cutting on metals that conduct electricity, such as mild steel, stainless steel, aluminium, copper, and brass. The thickness you can cut depends on the machine, with handheld ones handling up to around 38mm and bigger CNC machines going up to 150mm.

• Plasma cutting has several benefits, including being faster than many older methods, producing clean cuts with little finishing needed, and being relatively safe because it doesn’t use flammable gases. However, it does have some downsides, such as only working on conductive metals and using quite a bit of electricity.

• There are different types of plasma cutters, from portable handheld models to larger CNC machines. Well known suppliers include Xtreme Plasma, Parweld, GYS, and Hypertherm, each offering machines suited to different levels of work.

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What is Plasma?

Plasma is the fourth state of matter, formed when gas is heated until its atoms become charged particles that conduct electricity.

Plasma is often called the fourth state of matter, after solids, liquids, and gases.

It happens when a gas gets heated so much that its atoms break apart into charged particles.

This makes plasma able to conduct electricity and respond to electric and magnetic fields.

Plasma is actually the most common state of matter in the universe.

Stars, including our Sun, are made of plasma.

On Earth, we see it naturally in lightning and the northern lights.

We also create it on purpose in things like fluorescent lights, plasma TVs, and plasma cutting torches.

In workshops, plasma is made by heating a gas such as air, nitrogen, or argon to very high temperatures.

This turns the gas into plasma, which can conduct electricity and create extreme heat.

These properties make plasma very useful for jobs that need precise and powerful heat, like cutting through metal cleanly and quickly in manufacturing and fabrication work.

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What is Plasma Cutting?

Plasma cutting uses a super hot ionized gas stream from a torch to cut through conductive metals quickly and precisely with minimal cleanup.

Plasma cutting is a way to cut through metals that conduct electricity, and it does it very accurately and quickly.

It uses a special torch to create an extremely hot and fast stream of plasma, which is basically super heated gas.

This stream can reach temperatures as high as 30,000 degrees Celsius, hot enough to melt metal in an instant.

The force of the gas then blows the melted metal away, leaving behind a clean and narrow cut.

It’s commonly used in places like car repair shops, shipyards, metal workshops, construction sites, and aerospace work.

People prefer plasma cutting over older methods because it’s precise, fast, and usually needs very little cleaning up afterwards.

Unlike saws or other mechanical cutters, the torch doesn’t touch the metal, so the equipment lasts longer.

It also creates clean cuts with very little heat spreading to the surrounding area, making it efficient and good value for metalworking jobs.

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How Does Plasma Cutting Work?

Plasma cutting works by blasting a super-hot ionized gas stream through a torch to melt and blow away metal for clean cuts.

Plasma cutting works by creating a very hot stream of gas that melts metal and blows it away.

This gas is turned into plasma, which is superheated and can carry electricity.

The Main Parts of a Plasma Cutter

A typical setup includes a power supply, a torch, a supply of gas, and an electrode inside the torch.

The power supply provides the energy to keep the arc going.

The torch directs the gas and arc onto the metal you’re cutting.

Gas such as air, nitrogen, or argon is fed through the torch and turned into plasma.

How the cutting happens

When you switch the machine on, a spark ionises the gas and creates an arc to the metal surface.

The gas gets extremely hot, which melts the metal along the line you want to cut.

The fast moving gas then blows the melted metal out of the way, leaving a clean, narrow cut.

You can adjust the cutting speed and gas flow depending on how thick the metal is.

There are also the other plasma cutter consumables - nozzle, retaining cap, shield cap and swirl ring.

Different Types of Plasma Cutters

There are handheld versions that are easy to carry around.

These are great for on site work or smaller jobs and can usually cut metal up to about 25 to 38 millimetres thick.

Then there are CNC plasma cutters, which are used for bigger or more detailed work.

They offer greater accuracy and can handle metal up to around 150 millimetres thick.

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What Can You Cut with Plasma Cutting?

Plasma cutting works on conductive metals like mild steel, stainless steel, aluminium, copper, and brass, with thickness depending on the machine's power.

Plasma cutting works well on many metals that conduct electricity. Here are some of the most common ones.

Mild Steel

Mild steel is one of the materials people cut with plasma the most.

It’s used a lot in building work, making cars, and general metalwork.

Plasma gives fast, clean cuts on mild steel sheets and plates, no matter the thickness.

Stainless Steel

Stainless steel is known for not rusting and being strong.

You’ll find it in food processing equipment, medical tools, and building projects.

Plasma cutting cuts it precisely without damaging its good qualities, so it’s a great choice.

Aluminium

Aluminium is light and used in lots of places like planes, cars, and packaging.

Plasma cutting works really well on aluminium sheets and plates.

It cuts fast and leaves smooth edges with very little warping.

Copper and Brass

Copper and brass are often used for electrical parts, plumbing, and decorative items.

Since they conduct electricity well, plasma cutting works on them too.

It gives accurate cuts and minimal heat-affected zones, which is important for these metals.

How Thick Can You Cut?

The thickness you can cut depends on how powerful your plasma cutter is.

Handheld ones usually manage steel up to about 38 millimetres thick.

Bigger CNC machines can handle up to around 150 millimetres.

Other Metals

Plasma cutting can also be used on other alloys and special metals, as long as they conduct electricity.

This makes it useful across lots of different industries.

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Plasma Cutting Benefits

Plasma cutting is fast, precise, versatile, cost-effective, and relatively safe, making it a great choice for cutting many conductive metals.

Plasma cutting has quite a few benefits.

Fast and Efficient

Plasma cutting is much quicker than older methods like using a flame or sawing.

This is especially true for thinner or medium thickness metals, where it can finish jobs in a fraction of the time.

Faster cutting means you get more done and spend less on labour.

Precise, Clean Cuts

The plasma arc makes a narrow cut, so you get very accurate results and waste less material.

The edges are usually smooth and don’t need much extra work like grinding or sanding.

This precision is really useful in industries where accuracy matters a lot, like making planes or cars.

Very Versatile

One of the best things about plasma cutting is that it can cut lots of different metals that conduct electricity.

It works well on mild steel, stainless steel, aluminium, brass, copper, and many other alloys.

It can handle thin sheets right up to thick plates, so it’s good for both small jobs and big industrial work.

Cost Effective to Run

Plasma cutters are generally cheaper to operate than some other cutting methods.

They don’t need expensive gases or complicated setups, and the parts that wear out last a decent amount of time if you look after them.

You also save money because there’s less preparation and finishing work needed.

Easy to Use

Modern plasma cutters are designed to be straightforward.

Many have simple digital controls and safety features, so operators can learn to use them with just a bit of training.

The handheld versions are especially handy because they’re portable and convenient.

Safer

Unlike flame cutters that use flammable gases, plasma cutting usually uses compressed air or inert gases, which makes it safer overall.

Of course, you still need proper safety equipment and good ventilation.

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Plasma Cutting Downsides

Plasma cutting is limited to conductive metals, struggles with very thick materials, produces noise and fumes, and requires expensive equipment and regular consumable replacements.

Plasma cutting has quite a few good points, but it also has some limitations.

Only Works on Certain Metals

Plasma cutting can only be used on metals that conduct electricity, such as steel, aluminium, copper, and brass.

It won’t work on non-conductive materials like wood, glass, or plastics.

This means it’s not suitable for every type of job or industry.

Very Thick Materials

While plasma cutting is great for thin to medium-thickness metals, it’s not the best choice for extremely thick sections.

For very thick steel, oxy-fuel cutting is often still preferred.

Trying to cut beyond what the machine can handle usually leads to poor quality cuts and wears out the equipment faster.

Cleaning Up the Cut Afterwards

Plasma cutting generally leaves a smooth edge, but with thicker materials there can sometimes be a bit of residue left behind.

This means you may have to do some extra grinding, deburring or finishing to get a perfectly clean surface, which adds a bit of time and effort to the job.

Noisy and Produces Fumes

Plasma cutting creates quite a lot of noise, intense heat, and fumes.

You need good ventilation and proper fume extraction to keep the air safe to breathe.

Ear protection is also important because the noise levels can be quite high.

Equipment and Parts Can Be Expensive

Although running costs are generally reasonable, buying a good plasma cutter can be a big upfront expense.

You also need to factor in the cost of replacement parts, such as electrodes and nozzles, which need to be changed from time to time.

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Who Sells Plasma Cutting Machines?

Popular plasma cutting machine brands include Xtreme Plasma, Parweld, GYS, and Hypertherm, offering options for various workshop and industrial needs.

There are several well known companies that sell good quality plasma cutting machines for different types of work.

Xtreme Plasma

Xtreme Plasma focuses on CNC plasma tables and related equipment.

Their machines are built to be accurate and efficient, so they work well for both small workshops and bigger industrial jobs.

Xtreme Plasma also makes custom machines to suit specific cutting needs.

Parweld

Parweld is a well known brand for welding and cutting gear.

They make plasma cutters that are easy to use and built to last.

These cutters are reliable and are used in places like fabrication shops, car repair, and construction work.

GYS

GYS makes a wide range of plasma cutters for both professionals and people who use them occasionally.

Their machines have modern features that are easy to operate, making them suitable for many different cutting jobs.

People like them because they perform well, have good safety features, and don’t use too much energy.

Hypertherm

Hypertherm is known around the world as one of the top names in plasma cutting.

Their machines are praised for giving excellent cut quality, being reliable, and lasting a long time.

They make everything from small handheld cutters to advanced automated systems.

These are used in tough industries like shipbuilding, manufacturing, and repairing heavy equipment.

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FAQ

How do I maintain a plasma cutter so it lasts longer?

It helps to keep the machine clean and check the torch and cables regularly for wear.

Replacing parts like electrodes and nozzles when they start to wear out will also keep it working well and avoid poor cuts.

Do I need special training to use a plasma cutter safely?

Basic safety training is a good idea, especially around electricity, heat, and fumes.

Many people learn the basics quite quickly, but it’s worth following the machine’s instructions and wearing the right protective gear.

How much does it usually cost to run a plasma cutter?

Running costs mainly come from electricity and the gas you use.

Handheld machines tend to be cheaper to run for occasional work, while bigger CNC machines use more power, especially on thick or large pieces of metal.

Can plasma cutting be used on painted or coated metal?

Yes, it can often cut through painted or coated metal without much problem.

However, very thick coatings might affect the cut quality, so it’s sometimes better to remove heavy coatings first for the cleanest results.

What should I do if the cut quality starts to get worse?

Check the condition of the electrode and nozzle, as these parts wear out over time and can affect the cut.

Also make sure the gas flow and cutting speed are set correctly for the material and thickness you’re working with.

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Final Thoughts

You should now have a good idea of what plasma cutting is.

Plasma cutters are a fast and accurate way to cut metals that conduct electricity.

It combines speed, precision, and flexibility, which is why it’s used in so many industries like car repair, construction, metalwork, and shipbuilding.

It works well for both big industrial jobs and smaller, more detailed projects. It’s reliable and cost effective too.

Like any tool, getting the best results means understanding how it works.

Knowing its strengths and limits helps you pick the right machine, use it properly, and stay safe.

As industries change and need faster, more accurate work, plasma cutting continues to be a dependable choice.

Learning how to use it well can improve what you can do and help you get better results on all sorts of projects.

For more information on plasma cutting, or help with your plasma table needs, get in contact here with us at Xtreme Plasma.