Lotos Technology's non-touch pilot arc allows its plasma cutter to cut through rough, rusty, and painted surfaces while producing a minimum of slag. This compact unit has a convenient transport handle and uses compressed air as a medium.
This plasma cutter has a tendency to burn through the consumables at a fast clip. Consider purchasing extra to be prepared.
SUNGOLDPOWER's 50 A plasma cutter is priced considerably less than comparable models from other manufacturers. It comes with an inverter soft switch, hose clamp, and other needed supplies. Easy-to-read display. Max cut is 1/2 inch.
There are some issues with quality control. Faulty units have been shipped on rare occasions.
The voltage automatically adjusts to the input, allowing you to easily work at 120 V or 240 V. The range of the digitally controlled amperage is 15 A to 50 A, and the unit comes with a 90-day return policy so you can purchase with confidence.
As with other plasma cutters, you will need to stock up on your consumables.
This plasma cutter from Lotos Technology cuts through stainless steel, alloy steel, mild steel, copper, aluminum, and other metal materials. The unit is quick and easy to set up and comes with a 30-day refund and a 1-year limited warranty.
As with the other Lotos Technology plasma cutter that we spotlighted, this one also tends to burn through consumables rather quickly.
AMICO POWER's 40 A plasma cutter is quick and easy to set up. It works best with 3/8-inch materials. All the important controls and meters are located on the front of the unit. The torch has an ergonomic design so it's comfortable to hold.
A faulty unit may make it through quality control, but the warranty is your safety net for those rare occasions.
We purchase every product we review with our own funds — we never accept anything from product manufacturers.
A plasma cutter might sound a bit like some kind of weapon out of Star Wars, but in fact it’s a relatively easy to use and very versatile tool for all kinds of metal cutting. In basic terms, these machines use an electrical charge to create ionized gas (plasma) at very high temperatures. They can slice through steel, aluminum, and brass like a hot knife through butter!
Most plasma cutters are very portable; the flexibility to make rapid rough cuts or work in fine detail makes them popular with a wide range of fabricators, contractors, auto engineers, hobby metalworkers, and even artists.
Not surprisingly, there are lots of different models to choose from, which is great, but it can be confusing if you’re looking to buy your first plasma cutter. Here at BestReviews, finding answers to your questions is what we do, so we’ve been investigating the performance of all the latest models. Our recommendations represent cost-effective choices that will satisfy the needs of most users. We look at the specifications in more detail in the following plasma cutter buying guide.
There are a number of important aspects to consider when looking for a plasma cutter: cutting capability, gas supply, duty cycle, and additional features.
Plasma cutters are usually rated by amperage. The higher the amps, the greater the potential thickness it can cut, or the faster the machine will cut for an equivalent thickness. However, two 50-amp machines can have different performance, so you need to look into the specifications in more detail to see what those actual thicknesses are.
There are four possible figures, though you’ll probably only get one or two for any particular machine:
Rated cut thickness: This is the maximum depth at a cutting speed of 10 inches per minute (IPM).
Recommended cut thickness: This is the machine working at its best combination of speed and efficiency. Because this is slower than a rated cut, it will be thicker. However, it’s defined by the manufacturer, so it’s a bit subjective.
Clean cut thickness: This is the maximum while maintaining a relatively smooth finish (also subjective).
Severance (or sever) cut thickness: This is the absolute maximum the machine is capable of, regardless of finish quality.
Entry-level plasma cutters might only manage to cut through 1/8-inch plate. High-end models are capable of exceeding 1 inch. Think about the thickness of the material you’ll be cutting most of the time and try to choose a plasma cutter that can cope with that comfortably. If you’re always pushing the tool to its limits, the cut quality will suffer, you’ll use more consumables, and you’ll likely shorten the machine’s life, so going for a cheaper, less powerful model is often false economy.
Argon, oxygen, and nitrogen can be used in plasma cutters, but ordinary air is cheap, efficient, and easy to supply via a compressor. Some models have them built in, but they’re expensive, and they can only do that one job. A separate portable compressor is a reasonably affordable alternative and gives you much more versatility. Many people already own one with sufficient power, but it’s important to check the consumption requirements of the plasma cutter you’re considering. You need to look at airflow, given as cubic feet per minute (CFM or SCFM) and pressure, given as pounds per square inch (psi).
Plasma cutters get very hot. Safety circuits should prevent them from overheating, but they need to rest from time to time. The active period is called the duty cycle, and it’s given as a percentage for a given amp rating. The higher the percentage, the longer it will cut continuously.
For example, if a particular model has a 60% duty cycle, then after 6 minutes of working it would need 4 minutes to cool down. That doesn’t mean it can only run for 6 minutes — that will depend on the power of the plasma cutter and the thickness of material being cut. Each machine should come with the relevant information.
Bear in mind that you’ll need an air compressor to go with your plasma cutter. Check the specifications before you buy to make sure it produces enough volume (SCFM) and pressure (psi).
Many plasma cutters offer dual voltage. Running off either 110 or 220 volts allows you to work off household or industrial supply.
Torch lead: The torch lead is important because of how it impacts your working comfort. If you do a lot of bench work, it won’t be a problem, but it can be surprisingly frustrating if you’re moving around a lot and it’s too short. A common length is 12 feet, though you can find up to 25 feet on heavy-duty machines.
Torch size: Torch size and shape can vary. There are compact models if you often have to get into tight spaces. If you’re using a plasma cutter for long periods, you’ll want to make sure it’s comfortable to hold.
On cheap plasma cutters, the nozzle has to be touched to the metal to start. If you want high accuracy, you need a very steady hand. Non-touch models allow you to guide the torch more easily onto the work. It’s a particularly useful feature if you’re working on uneven surfaces.
Drag technology allows you to run the nozzle across the surface once the cut has started. This lets you trace complex shapes with great precision. If you try the same with a non-drag machine, you can get a secondary arc that attempts to weld the nozzle to the material! It’s easy to break free, but it gives you a very stop-start jagged cut.
High-frequency (HF) starting (called a pilot arc) is common, but it can interfere with radio and TV signals and other sensitive equipment. Non-HF pilot arcs don’t cause the same problems.
Weight will be a consideration for those who need to move their plasma cutter from place to place. Almost all have carrying handles, but there’s a big difference between a 40-amp machine that weighs 20 pounds and a 65-amp model that weighs 70 pounds or more.
Your plasma cutter will probably come with a small selection of consumables — nozzles, electrodes, and so on. These will be an ongoing cost, so it’s worth comparing alternatives. You don’t have to buy from the same manufacturer, but it’s best to invest in quality. Cheap consumables can have a negative impact on the quality of your work.
If you’re going to do welding as well, consider a combined plasma cutter/TIG/stick machine, but check the specifications carefully to ensure you’re not making compromises just to save a few bucks.
Safety glasses: Hobart 770726 Shade 5 Mirrored Lens Safety Glasses
A stylish,modern design with tough, impact-resistant polycarbonate lenses, these glasses will protect your eyes from unpleasant flash radiation when plasma cutting without the need for bulky welding goggles or a full mask. They’re tested to the ANSI Z87.1 impact standard, scratch resistant, and cheap, too!
Air compressor: Makita Portable Air Compressor
The air supply demands of plasma cutters vary, but all the top-rated models we looked at require 3.5 SCFM, or better, and a minimum of 60 psi. The 2.5-horsepower Makita comfortably exceeds those figures, is very portable, and has a terrific reputation for reliability and durability.
Inexpensive: Although you can find cheap plasma cutters for around $150, performance and reliability can be questionable. We’d look at spending $250 or so for a good machine.
Mid-range: Between $300 and $500 you’ll find a wide choice of tools that will satisfy most users. Unless you’re a full-time professional or you want a built-in compressor, there’s little reason to pay more. You’ll also find several good plasma cutter/welder combo machines in this price range.
Expensive: If you want a compressor in the same unit, you’ll pay upwards of $600. If you need maximum cutting capacities — severance capabilities of an inch or more — prices can top $3,000.
Plasma cutters can cause extremely serious injuries if you’re not paying attention. Never use one when you’re not 100% fit and alert. Make sure nothing can distract you (particularly kids or pets).
Don’t see what you need in our matrix? We found a few more for you. If you’re on a tight budget, the Display4Top Cut-50 Inverter Plasma Cutter is an energy-efficient option with a full set of accessories, including handheld mask. Despite the low cost, it has competitive performance with a maximum cut of almost 1/2 inch.
The PRIMEWELD Ct520d Plasma Cutter incorporates a 200-amp TIG and stick welder for added versatility and without breaking the bank. Maximum cut is again 1/2 inch, and 60% duty cycle is typical of many mid-range models.
Those who need serious cutting capability will want to look at the Hypertherm Powermax 65. It’s expensive, and you’ll need a powerful compressor, but this monster has a maximum severance cut of 1 1/4 inches.
Q. Can I use a welding torch as a plasma cutter?
A. Not really. Yes, you can cut through some metals, but a torch doesn’t have anything like the power of a plasma cutter. It’s slower, and you have virtually no control. The finish also tends to be poor. If you want an accurate, professional job, you need to invest in the proper tool.
Q. What is arc eye?
A. Arc eye, or welder’s flash, is an inflammation of the corneas that you get from exposing your eyes to ultraviolet light during plasma cutting or welding. It might not be noticed right away, but a few hours later your eyes will be extremely itchy and painful and water a lot. Avoiding it is easy: always wear welder’s safety glasses, goggles, or mask.
Q. Are the fumes from plasma cutting harmful?
A. They can be. For example, cutting stainless steel and other metals that incorporate chromium releases hexavalent chromium, which attacks the skin and is associated with lung cancer when inhaled. Other metals can produce respiratory or nerve damage. The Occupational Safety and Health Administration (OHSA) produces guidelines for different materials and safe exposure times. Personal safety in this case is mostly about having adequate ventilation in your workshop.
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