1. Ensure the correct air pressure and flow of the plasma
The correct gas pressure and flow of the plasma are very important to the service life of consumables. If the air pressure is too high, the life of the electrode will be greatly reduced; if the air pressure is too low, the life of the nozzle will be affected.
2. Use a reasonable cutting distance
According to the requirements of the operating instructions, use a reasonable cutting distance, which is the distance between the cutting nozzle and the surface of the workpiece. When perforating, try to use twice the normal cutting distance or the maximum height that the plasma arc can deliver.
3. The thickness of the perforation should be within the allowable range of the machine system
The plasma cutting machine cannot perforate the steel plate that exceeds the working thickness. The usual perforation thickness is 1/2 of the normal cutting thickness.
Four, do not overload the nozzle
Overloading the nozzle (that is, exceeding the operating current of the nozzle) will quickly damage the nozzle. The current intensity should be 95% of the working current of the nozzle. For example: the current intensity of a 100A nozzle should be set to 95A.
5. Keep the plasma gas dry and clean
The plasma system needs dry and clean plasma gas to work properly. Dirty gas is usually a problem in the gas compression system, which shortens the service life of consumable parts and causes abnormal damage. The method to test the gas quality is to set the cutting torch in the test state, and place a mirror under it to consume the gas in the cutting torch. If water vapor and mist appear on the mirror, you need to find out the reason and correct it.
Six, the cutting should start from the edge
Try to cut from the edge as much as possible, instead of perforating and cutting. Using the edge as the starting point will extend the life of the consumable parts. The correct method is to directly aim the nozzle at the edge of the workpiece before starting the plasma arc.
Seven, avoid the elongated expansion of the plasma arc
If the plasma arc can only reach the surface of the workpiece when it is stretched and expanded, the plasma arc will produce such stretching and expansion at the beginning and end of cutting, which will cause abnormal damage to the nozzle. This problem can be avoided if the correct edge start technique is used and the appropriate "arc breaking" signal time is selected.
8. Reduce unnecessary "arc starting (or arc guiding)" time
The consumption of the nozzle and the electrode is very fast when starting the arc. Before starting, the torch should be placed within the walking distance of the cutting metal. 9. Apply splash-proof chemical paint on the protective shell
The splash-proof chemical coating helps to reduce the buildup of slag on the protective shell. But be sure to remove the protective shell from the torch before applying splash-proof paint.
10. Remove the slag on the protective shell
The slag on the protective shell of the cutting torch should be removed frequently, otherwise the slag will cause a destructive heavy plasma arc.
11. Clear the gas after replacing consumables
After replacing consumables or stopping for a long time, the gas should be cleared (2-3 minutes is appropriate) to ensure that water and mist are discharged from the torch.
12. Try to keep the cutting torch and consumable parts clean
Any dirt on the torch and consumables will greatly affect the function of the plasma system. When replacing consumables, place them on a clean flannel, check the connecting threads of the cutting torch frequently, and clean the electrode contact surface and nozzle with hydrogen peroxide cleaner.
13. Remove oxides from air or oxygen nozzles
When air or oxygen plasma is selected, oxide will be deposited in the nozzle, which will affect the airflow and reduce the life of consumable parts. Wipe the inside of the nozzle with a clean flannel to eliminate oxides.
14. Use softened water to inject the cutting torch
Hard water will cause metal impurities to deposit on the nozzle ring, which will affect the air flow, reduce the quality of the torch and shorten the life of consumables.
15. Check the air flow and cooling flow every day
One of the most common reasons for torch damage is the lack of cooling flow, and the air flow to the torch needs to be checked frequently