The plasma arc stability of the micro-beam plasma welding machine directly affects its cutting quality. The instability of the plasma arc will lead to uneven welds, build-up and other defects, and also shorten the life of related parts of the control system, as well as frequent replacement of nozzles and nozzles. electrode. The editor of Duomu Industry summarized the solutions to some common undesirable phenomena.
Air pressure or flow is too low;
When the micro-beam plasma welding machine is working, if the working pressure is far below the specification requirements, that is, the plasma arc ejection speed decreases, and the input air flow rate is less than the specified value. At this time, enough high-energy and high-speed negative ions cannot be formed, resulting in poor cutting quality , The cut is not penetrated, and the cutting mouth is built up. The reasons for the low air pressure are: insufficient intake pressure or flow, too low pressure regulation by the pneumatic pressure regulator, oil in the solenoid valve, and poor air flow.
Answer: Before using the micro-beam plasma welding machine, pay attention to the output pressure display of the air compressor. If it does not meet the requirements, pressure adjustment or overhaul can be carried out. If the input air pressure has reached the requirements, check whether the adjustment of the air filter pressure reducing valve is correct, and whether the gauge pressure display meets the cutting requirements. In addition, routine maintenance of the air filter pressure reducing valve is required to ensure that the air intake is dry and oil-free. If the input air quality is poor, it will cause oil pollution in the solenoid valve, the valve core is difficult to open, and the valve port cannot be fully opened. In addition, if the air pressure of the cutting torch nozzle is too low, the solenoid valve needs to be replaced; the reduction of the air path section will also cause the air pressure to be too low. You can replace the air pipe according to the instructions for use.
The second is that the air pressure is too high.
When the input pressure is greater than 0.45MPa, after the micro-beam plasma welder forms a plasma arc, the excessive airflow will blow away the concentrated arc column, disperse the arc column energy, and reduce the cutting strength of the plasma arc. The reasons for the high air pressure are: improper input air adjustment, improper adjustment of the air filter pressure reducing valve, or failure of the air filter pressure reducing valve.
The solution suggested by the editor of Duomu Industry is to check whether the pressure of the air compressor is adjusted properly, and whether the pressure of the air filter pressure reducing valve and the air filter are abnormal. After the micro-beam plasma welder is started, if the air filter pressure reducing valve adjusts switch and the gauge pressure does not change, it indicates that the air filter pressure reducing valve is malfunctioning and needs to be replaced.
