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Do you need to purchase a cutting machine for regular maintenance and maintenance work? Are you currently working on some projects that require a high-performance cutting device? Or do you need a new piece of equipment to replace the one you are using now? All of the above is enough to allow you to consider plasma cutting. The current low-cost, more compact and portable machinery is flooding the market with newer technologies that increase profits and are easier to use. Therefore, it may be time for you to take time and money to consider plasma cutting equipment. Plasma cutting is easy to use, excellent cutting effect, fast working speed and high efficiency.
1 What is plasma cutting technology?
The simplest explanation is that the use of high-speed jets of ionized gas jets from the compressed air port to achieve the cutting effect, which is the plasma cutting technology. High-speed ionized gases, that is, plasmas, conduct electrons through the plasma flame to the workpiece. The plasma heats the cut parts and melts the metal. The high-speed ion gas flow mechanically blows open the molten metal and cuts the metal open.
2 How does plasma cutting and flame gas cutting compare?
Plasma cutting can only be effective on metals that can act as conductors—low carbon steels, aluminum and stainless steel are typical examples. When cutting low-carbon steel, operators will experience faster and deeper cutting results.
Flame gas cutting cuts by burning high temperature, or cutting metal by oxidation. Therefore, the scope of its application is limited to ferrous metals that can be treated using oxidation technology. Metals such as aluminum and stainless steel generate oxides that inhibit further oxidation. This makes traditional flame gas cutting impossible to handle this type of material. Plasma cutting does not rely on oxidation treatment, so it may effectively cut aluminum, steel, and some other conductive metals.
And different kinds of gases can be used for plasma cutting, and most people currently use compressed air for plasma cutting. Compressed air is available at most points of sale, so plasma cutting does not require flammable gases and compressed oxygen as the operating gas.
3 What can I do with plasma cutting?
Plasma cutting is an ideal way to cut steel and non-ferrous metals less than 1 inch thick. Flame gas cutting requires the operator to carefully control the cutting speed to maintain the oxidation treatment. Plasma cutting is more resilient in this regard. Plasma cutting is excellent in some applications, such as cutting metal mesh, which is impossible to achieve with flame gas cutting. In addition, plasma cutting is much faster than mechanical cutting and it is easier to perform non-linear cutting.
4 What plasma cutting can't be done, but flame gas cutting can do it?
Plasma cutting is more expensive than cutting with a flame gas. Flame gas cutting does not require connecting power and compressed air, which is easier for some users. Flame gas cutting is faster than plasma cutting when cutting thicker sections of steel.
5 How to choose when purchasing a plasma cutting machine?
Once you think that plasma cutting is the right choice for you, you can refer to the following:
5.1 The first factor in determining the thickness of the metal you are most often cutting is the thickness of the metal that is usually cut. Most plasma cutter power supplies are sized by cutting ability and current size. Therefore, if you are usually cutting thin metal, you should consider a low-current plasma cutting machine. Also, although small machines cut a certain thickness of metal, the quality of the cut may not be guaranteed. Conversely, you may also get almost no cut through, and you may still leave unused metal residue. Each machine will have a set optimal cut thickness range - make sure the setting is suitable for your requirements. In general, a typical plasma cutter has a current output of about 25 amps.
5.2 Choosing Your Best Cutting Speed ​​Are you cutting in a production environment or where cutting speed is not very important? When purchasing a plasma cutting machine, the manufacturer should provide data on the welding speed (IPM, inch/minute) of the machine at all metal thicknesses.
If you are going to perform long cuts or automatically set cuts, make sure to check the machine's duty cycle. Workload cycling is simply the duration of operation before the torch is operated until the overheating requires cooling. Workload cycles are usually determined by percentage as a standard for 10 minutes. for example. A 50-amp current of 60% duty cycle means that you can continue cutting for 6 minutes (100% for 10 minutes) at a current output of 50 amps. The higher the workload cycle, the longer you can continue cutting.
6 Does this machine provide the option to start at high frequencies?
Most plasma cutters have a pilot arc that uses high frequencies to direct current through the air. However, high frequencies can interfere with nearby electronic devices, including computers. Therefore, it may be quite advantageous to be able to eliminate these high frequency potential problems.
7 Comparison of Loss and Life There are various external parts on the plasma torch that need to be replaced. Usually we call them consumables. The machine you need to look for should be the least consumable. Less consumables means cost savings. For example, Lincoln Electronics' Pro-Cut cutting torch has only three types of front parts, only two of which need to be replaced: electrodes and nozzles.
Look closely at the manufacturer's product description to see how long the consumables on the product can be used, but make sure that you compare the same type of data when comparing two machines. Some manufacturers cut the number to assess the loss, while others use the number of starts as a standard.
8 Testing the machine and checking the cutting quality The cutting work was tested on some machines and the same cutting speed was tested on the same thickness of the work piece, which saw the best cutting quality. While you are comparing cuts, check the residue on the bottom of the cut piece and see if the cut is vertical or angular.
What should be sought is also a plasma cutter that can provide a compact and concentrated arc.
Another test is to remove the cutting torch from the workpiece while cutting and to see how far the cutting torch is from the workpiece to maintain the cutting arc. The longer the arc is pulled, the higher the voltage and the ability to cut a thicker workpiece.
9 Checking the Visibility of the Machine When you are cutting, you need to be able to see your cutting work, especially when cutting in a specific pattern. Visibility is better when using a geometric cutting torch - the small, compact cutting torch makes it easier to see the cutting job.
10 Portable Many users need to use plasma cutting machines in a variety of different ways. They often need to move machines between platforms and even different sites. Lightweight portable machines with mobile capabilities are quite useful. In addition, machines with small footprints are also valuable if the workplace is small.
At the same time, you should choose a machine that has room for working cables, cutting torches and consumables. Because there is a built-in storage space, site parts are not even lost, so handling and carrying are convenient.
11 Determining the strength of the machine For today's high-intensity workplaces, durable and control-protected machines should be chosen. For example, the connection between the device and the cutting torch has more protection than it does not. Some machines also have protective rails on the air filters and other internal parts. These protective measures are important because the filters ensure that the oil is removed from the compressed air. Residual oils can cause breakdown and cutting performance to deteriorate. So protecting the filter that removes oil and water is very important.
12 To see if the machine can be easily and comfortably used to select user-friendly, user-friendly, easy-to-see and operate machines. This type of control panel can be easily used by people who do not often use plasma cutting machines. In addition, an operating program is printed on the panel to facilitate the setup and troubleshooting of problems.
13 Safety Measures Select a machine with a nozzle-in-place sensing insurance. With this safety device, the cutter will not start working until the nozzle is in place. Machines that provide pre-flow sequences should also be selected. This feature provides further warning protection prior to arcing.
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