Reasons And Solutions For The Arc Breaking Of CNC Plasma Cutting Aluminum Plate

CNC plasma cutting aluminum plate is a computer-controlled machine with a cutting table, a plasma generator, and other CNC kits. We also call it CNC plasma table, CNC plasma cutting table, CNC plasma cutting machine, etc. It is the most popular metal cutting machine in this world. Because it can cut almost any metal well in quality, from steel, stainless steel, aluminum, copper, titanium, etc. CNC plasma cutter also has the advantages of fast cutting speed, smooth cut surface, little heat distortion & deformation.

CNC plasma cutting machine has the advantages of simple operation, high cutting precision, high work efficiency, and low labor intensity. It is very popular in cutting a variety of metals and small size workpieces. However, for users who are exposed to CNC plasma cutting machines for the first time, arc breaking has become a common and headache problem, to help everyone solve this problem. igoldencnc CNC summarized the reasons and solutions for the arc breaking of CNC plasma cutting machine, hoping to help users operate.

The air pressure is not stable enough

The working pressure of cnc plasma cutting aluminum plate is too high or too low will affect the cutting effect. If the working pressure is far below the required pressure. This will cause the discharge speed of the plasma arc to decrease, and the input air flow rate is less than the specified value. Can not form high-energy, high-speed plasma arc. Causes poor incision quality, impenetrable incision, and incision tumor. If the input air pressure exceeds 0.45MPa, the working air pressure is too high. After the ion arc is formed, the excessive airflow will blow away the concentrated arc column, disperse the arc column energy, and weaken the cutting strength of the plasma arc.

Burning torch nozzle and electrode

Because of the improper installation of the nozzle, the cnc plasma cutting aluminum platebroke the arc. For example, if the thread is not tightened, the gears of the equipment are not adjusted properly, the cutting torch that requires water cooling is working, the cooling water is not passed as required, and the frequent arcing will cause premature damage to the nozzle.

Solution: Correctly adjust the gears of the equipment according to the technical requirements of cutting the workpiece. Check whether the torch nozzle is installed firmly. Need to connect the cooling water nozzle to make the cooling water circulate. When cutting, adjust the distance between the cutting torch and the workpiece according to the thickness of the workpiece.

Input AC voltage is too low

There are large-scale electrical facilities at the use site of the cnc plasma cutting aluminum plate, and the failure of the internal main circuit components of the cutting machine will cause the input AC voltage to be too low and cause the arc to break.

Solution: Check whether the power grid connected to the CNC plasma cutting machine has sufficient carrying capacity. Whether the power cord specifications meet the requirements. The installation location of the CNC plasma cutting machine should be far away from large-scale electrical equipment and places with frequent electrical interference. During use, clean the dust in the cutting machine and the dirt on the components regularly, and check whether the wires are aging.

Poor contact between the ground wire and the workpiece

Grounding is an essential preparation before cutting. If a dedicated grounding tool is not used, insulation on the surface of the workpiece, and long-term use of a ground wire with serious aging, etc., the ground wire will not contact the workpiece badly, and the arc will be broken.

Solution: You need to use professional grounding tools, and check whether there is any insulation affecting the ground wire and the surface of the workpiece, and avoid using aging ground wires.

The spark generator cannot automatically break the arc

When the cnc plasma cutting aluminum is working, the plasma arc must first be ignited. The high-frequency oscillator excites the gas between the electrode and the inner wall of the nozzle to generate a high-frequency discharge, which partially ionizes the gas to form a small arc. The small arc acts on the compressed air and ejects from the nozzle to ignite the plasma arc. This is the main task of the spark generator. Under normal circumstances, the working time of the spark generator is only 0.5~1s. The reason for the inability to automatically cut off the arc is generally that the control circuit board components are out of adjustment and the discharge electrode gap of the spark generator is inappropriate.

Solution: It is necessary to check the discharge electrode of the spark generator frequently to keep its surface level. Adjust the discharge electrode gap of the spark generator (0.8～1.2mm) in time, and replace the control board if necessary.

Safety Gear

cnc plasma cutting aluminum plate need to be handled and used with the utmost care. Some basic safety precautions you should always include:

Keep a distance between your work area and your cutting area.

Keep a fire extinguisher handy at all times.

Do not use the plasma cutter without proper training from a professional.

While these three measures can help safeguard workers in many situations, wearing the proper protective equipment when using a plasma cutter should always occur. This protective equipment includes:

Flame-Resistant (FR) Balaclavas

Safety Cutting Glasses and Face shields

2. Gloves

3. Non-flammable and Heat-resistant Apparel

How to choose cnc plasma cutting aluminum

1.Price

No matter what kind of plasma is purchased, it is important to consider the factor of budget, because if the budget is ignored, even if the intended effect can be achieved, it will not necessarily be purchased if it exceeds the budget too much.

At present, plasma is mainly divided into domestic and imported two categories, of which domestic price is divided into low, medium and high three specifications, but generally speaking, users should still be acceptable!

The price of imported products is several times higher than that of domestic products, even dozens of times, and consumables like cutting nozzle and electrode are much more expensive!

Usually, compared with the same specification of domestic plasma, imported plasma cutting effect is better, the disadvantage is that the price and the late use of the cost is too high, the general enterprises are difficult to accept!

2.Cutting thickness

Cutting thickness

No matter what kind of plasma is used, it has its own most suitable cutting size range, usually low power plasma is suitable for cutting thin plates, which is well known.

If the plasma power is too high, it is not suitable for cutting thin plates!

At present, domestic 40-60a plasma cutting is widely used for domestic steel plates below 2mm, and imported ones are occasionally used, but the quantity is not large, because the price is relatively expensive.

It is hereby seriously stated that for steel plates below 2mm, it is important to remember that any other models, such as portable and gantry type, are not suitable for cutting except high-speed desktop plasma cutting machine.

If it is more than 2mm, it is not subject to this restriction and can be used.

For thicker steel plate, such as 2-16mm steel plate, portable and gantry type machines can be cut. If the thickness is 25 mm or even thicker, only the gantry type is suitable!

3.Cutting materials

This general engaged in metal processing technical personnel all know, using plasma to cut stainless steel and other alloy materials is its strength, carbon steel plate mainly depends on flame cutting method, so as long as there is stainless steel, it must be equipped with plasma cutting machine!