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Laser Cutting Thick Plates: Debugging Methods And Skills

Stainless steel plate is a favorite material for users in many areas.

The products manufactured by it have excellent performance in all aspects and relatively long service life, which are now widely used in machinery manufacturing, construction engineering, kitchenware manufacturing, rail vehicles and other industries.

Now, most of the stainless steel plate choose laser cutting, but if want to cut out high-quality thick plate stainless steel, it will need certain skills.

I. Debugging method of stainless steel thick plate cutting

Debugging method of stainless steel thick plate cutting

II. The selection of nozzle

The size of the nozzle diameter determines the shape of the airflow into the incision, the gas diffusion area, and the gas flow rate, which affects melt removal and cutting stability.

If the airflow into the incision is large, the speed is fast, and the position of the workpiece in the airflow is appropriate, thus the jetting ability to remove the molten material will be stronger.

The thicker the stainless steel, the larger the nozzle should be used, the higher the air pressure setting, the pressure and flow rate should be satisfied at the same time to cut a normal cross-section effect.

selection of nozzle

Note: Air pressure at a fixed flow rate and with different nozzle sizes

The thicker the stainless steel, the larger the nozzle should be used, and the larger the proportional valve setting, the larger the flow rate should be to ensure pressure and to cut a normal cross-sectional effect.

At the same time, in order to guarantee the cutting effect and to protect the nozzle from damage, it is necessary to do a coaxial test before the cutting process. It is also necessary to do coaxial testing before the cutting process to ensure that the nozzle and the laser output beam coaxial.

Test Method: Tape the transparent tape paper to the nozzle outlet end surface, adjust the laser output power for punching, observe whether there is a center hole on the transparent tape paper and the position of the center hole, synchronously adjust the adjustment screw on the mirror cavity handle until the laser punched hole on the transparent tape paper coincides with the center of the nozzle.

coaxial testing before the cutting process

III. Frequency adjustment

The effect of frequency change on the cutting of stainless steel plate: the frequency decreases from 500 to 200Hz, the cutting cross-sectional effect becomes fine and layering slowly improves.

After frequency is set to 100Hz, it can not cut and become anti-blue light.

By changing the frequency, it can find the best frequency range.

To ensure the best cutting cross-section, it is necessary to ensure that the number of pulses and single pulse energy to perfectly match.

Frequency adjustment

Frequency 500 HZ 400 HZ 300 HZ 200 HZ
Duty ratio 55% 55% 55% 55%

IV.  Duty ratio adjustment

Duty ratio adjustment on the cutting of stainless steel plate: duty ratio of 53% is the critical value. If it continues to reduce the duty ratio, uncut marks appear on the lower surface, while the section becomes rough, the delamination is obvious, and the cut surface becomes yellow when increasing duty ratio to 60%.

Duty ratio adjustment

Frequency 200 HZ 200 HZ 200 HZ 200 HZ
Duty ratio 52% 53% 55% 60%

V. Focus selection

Different focus makes different thicknesses, material and quality of the cut.

Different materials and thicknesses need to be adjusted to a different focus.

Before cutting, after measuring the actual zero focus, only refer to cutting process parameters to determine the most suitable cutting focus faster.

Frequency 200 HZ 200 HZ 200 HZ 200 HZ
Duty ratio 52% 53% 55% 60%

Note: The above is the method of parameter debugging, but the specific value needs to be determined according to different power lasers and different thickness plates.

VI. Myriawatt laser and effects of cutting thick stainless steel

Focus selection

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4 thoughts on “Laser Cutting Thick Plates: Debugging Methods And Skills”

  1. I’m confused – under ‘focus’, you only reference frequency and duty cycle. Did you intend to mention focal length or where the focus point should be with respect to the surface of the workpiece?

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