High power laser cutting machine has the advantages of large cutting width, fast cutting speed and thicker plate cutting. High power laser cutting has been recognized by the market. But because the high-power cutting technology is still in the primary popularization stage, some operators on the high-power laser cutting skills are not very skilled. The following are some difficulties and solutions in the cutting process of high power laser cutting machine:

If the cutting effect is found to be poor, the following reasons should be checked first:

1. All the lenses in the laser head are clean;

2. The water temperature of the water tank is normal, and there is no condensation in the laser;

3. High purity of cutting gas, smooth gas path, no leakage.

Problem 1: Cutting ribbons with stripes.

Possible causes:

1, the nozzle selection is wrong, the nozzle is too big;

2. The air pressure setting is not correct, and the set pressure is too high, resulting in stripes of overburning;

3, cutting speed is not right, cutting speed is too slow or too fast will also cause comprehensive overburning.

The solution:

1. Change the nozzle, change the nozzle with small diameter, such as 16mm carbon steel smooth cutting. High speed nozzle D1.4 can be selected; 20mm carbon steel bright surface can choose D1.6 high-speed contact nozzle;

2. Reduce cutting pressure and improve cutting quality;

3. Adjust the cutting speed to match the power with the cutting speed.

Problem two: Residue at the bottom.

Possible causes:

1. The nozzle selection is too small, and the cutting focus does not match;

2. The air pressure is too small or too large, and the cutting speed is too fast;

3. The plate material is poor, the quality is poor, and the small nozzle is difficult to clear.

The solution:

1. Replace the large-diameter nozzle, and adjust the positive focus to the appropriate position;

2. Increase or decrease the air pressure until the air flow is appropriate;

3. Choose a good plate.

Problem 3: Burrs on the bottom

Possible causes:

1. The nozzle diameter is too small to meet the processing requirements;

2. If negative defocus does not match, negative defocus should be added and the appropriate position should be modulated.

3. The air pressure is too small, resulting in burrs at the bottom and unable to cut completely.

The solution:

1. Choose large diameter nozzle to increase air flow;

2. Increase the negative defocus so that the cutting section reaches the bottom position;

3. Increasing air pressure can reduce burrs at the bottom.