Top 10 common problems and solutions of laser (2)

4、 Fault Name: QBH installation alarm

Protection measures: stop the main power supply and turn off the laser.
Possible cause: poor contact between QBH output contact and cutting contact.
Solution: turn off the laser, check the laser QBH output head and cutting head, and re install.

5、 Fault Name: emergency stop alarm

Protection measures: stop the main power supply and turn off the laser.
Possible cause: the emergency stop switch is pressed.
Solution: the emergency stop switch returns to normal state, restart the laser.

6、 Fault Name: water flow alarm

Protection measures: stop the main power supply and turn off the laser.
Possible cause: the water cooler is abnormal, resulting in the decrease of water flow.
Solution: turn off the laser, check whether the flow rate and water temperature of the water cooler are normal, and whether the water pipe is blocked.
After the inspection, restart the laser and the laser returns to normal.

7、 Fault Name: abnormal communication alarm

Protection measures: stop the main power supply and turn off the laser.
Possible cause: there is no signal transmission between single module communication line and main module.
terms of settlement:
1. Check whether the signal line between single module and main module is loose;
2. Check whether the single module can power on and start normally, whether there is red light, and whether the auxiliary power supply voltage output works normally.

Top 10 common problems and solutions of laser (1)

1、 Fault Name: forward light PD alarm

Protection measures: stop the main power supply and turn off the laser.
Possible cause: the PD inside the laser does not detect the laser.
terms of settlement:
(1). restart the laser, do not turn on the laser, and check whether there is red light. If there is no red light, please contact Chuangxin customer service personnel;
(2). if there is red light, please check whether the relevant module can turn on the laser. Check whether the voltage output of DC switch power supply of module power supply is normal.

2、 Fault Name: Super return light alarm

Protection measures: stop the main power supply and turn off the laser.
Possible cause: the laser beam combining module detects that the return light is too strong.
terms of settlement:
(1). Check the focus position of the laser;
(2). Check whether the materials are placed horizontally;
(3). Check whether the material is ultra-high reflection material;
(4). Check whether the material thickness exceeds the standard, and give an alarm if it cannot be cut through;
(5). Turn off the laser, suspend use for 3-5 minutes, restart the laser and turn on the laser.

3、 Fault Name: pump source temperature alarm

Protection measures: stop the main power supply and turn off the laser.
Possible causes: the pump source temperature of the laser module is too high, and the temperature alarm.
terms of settlement:
Turn off the laser, and check whether the flow rate and water temperature of the water cooler are normal, and whether the water pipe is blocked.
After the inspection, restart the laser and the laser returns to normal. If not, contact Chuangxin customer service staff.

Four ways to solve over burning in laser cutting

How to avoid over burning in laser cutting sheet metal?

1. Add cooling point at the corner
When cutting metal plate with sharp corners, the position where overburning is more likely to occur is often at the sharp corners. Overburning will cut the sharp corners into round shapes. At this time, you can add a cooling point at the sharp corners, pause at the sharp corners and blow air.

2. Use high power laser
When cutting carbon steel, a higher power laser can be used, and the bright surface cutting process can effectively avoid overburning, and this kind of cutting process can cut the finished product without burr and bright surface.

3. Cutting with nitrogen
In sheet metal cutting with oxygen as auxiliary gas, nitrogen can be used for cutting. When cutting with nitrogen, the material completely depends on the laser energy to melt, and the nitrogen can blow out the cutting seam and avoid inappropriate chemical reaction. The melting point region temperature is relatively low, coupled with the cooling and protection of nitrogen, the reaction is stable and uniform, and the cutting quality is high. The cross section is fine and smooth, the surface roughness is low, and there is no oxide layer.

4. Increase the air pressure
When optical fiber laser cutting machine is used to process aluminum alloy and stainless steel, the auxiliary gas is nitrogen or air, so edge burning will not occur in the cutting process. However, due to the high temperature of the material inside the small hole, the phenomenon of slag hanging on the inside will be more frequent. In this case, the burr and slag can be reduced by increasing the pressure of auxiliary gas.

 

Select the focus position correctly, cut out high quality plate!

Before cutting, the distance between laser focus and cutting material must be adjusted. Different focus positions often lead to different fineness of cutting material section, different slag hanging at the bottom, and even unable to cut off the material; Different cutting workpiece, different materials, laser cutting machine focus position selection will be different, so how to choose correctly?

1.Focus cutting

That is, the cutting focus is on the workpiece, and the focus is located above the cutting material.
For carbon steel oxygen cutting, it is suitable to use positive focus. The cutting range of the bottom of the workpiece is larger than that of the upper surface, which is conducive to slag removal and oxygen reaching the bottom of the workpiece to participate in full oxidation reaction. In a certain range of focus, the larger the positive focus is, the larger the spot size is, the more sufficient the preheating and heat supplement around the slit is, and the smoother and brighter the carbon steel cutting surface is.
For the 10000 watt laser pulse mode cutting stainless steel thick plate, the positive focus is adopted, the cutting is stable, which is conducive to slag removal and is not easy to reverse blue light;

2.Negative focus cutting

That is, the cutting focus is in the workpiece. In this mode, because the focus is far away from the cutting surface, the cutting range is relatively larger than that of the cutting point on the workpiece surface, and the cutting air flow and temperature need to be large and sufficient.
When cutting stainless steel, it is suitable to use negative focus cutting, the cutting surface is even and the section is good.
For the plate perforation before cutting, because the perforation has a certain height, the negative focus is adopted to ensure the minimum spot size and the maximum energy density at the perforation position, and the deeper the perforation position is, the larger the negative focus is.

3.Zero focus cutting

That is, the cutting focus is on the surface of the workpiece. The cutting surface close to the focus is relatively smooth, while the lower surface away from the cutting focus is rough. This is mainly used for cutting thin plates and pulse laser peak power vaporization to cut metal foil.

The choice of the positive and negative focus of laser cutting is not determined by the cutting plate material (stainless steel, carbon steel), but by the cutting method (oxidation cutting, melting cutting).

Debugging method of stainless steel plate cutting process

2.Debugging method of stainless steel plate cutting process

1). According to the different power 10000 watt laser, referring to Chuangxin cutting process parameter table, first debug the thickest carbon steel bright surface and stabilize the processing effect of the thickest carbon steel;
2). After the effect and efficiency meet the requirements, adjust the perforation process parameters;
3). After adjusting the cutting and piercing process, small batch cutting is needed to verify the consistency of process and effect.

Common problems and solutions of stainless steel cutting debugging of MAX 1500W laser

Thickness and effect Problem Resolvent

6mm: No slag

20mm:Slag

Slicing 1. Reduce cutting speed
2. Increase cutting air pressure
3. Increase nozzle size
4. Improper cutting focus
Cutting hanging slag 1. Inappropriate cutting speed
2. Increase cutting air pressure
3. Decrease negative focus
Low cutting efficiency 1.Lens dirty
2.Increase cutting air pressure
40mm: A small amount of slag Slicing 1.Reduce the frequency
2.Raise the focus
3.Increase the cutting pressure
Yellowing of cutting surface 1.Reduce the duty cycle
2.Raise the focus
3.Increase the cutting pressure

Common problems and solutions of laser cutting thick plate

1.Debugging method of carbon steel thick plate cutting process:

1).According to different power wanwa laser, according to the cutting process parameter table of MAX, the effect of the smoothest carbon steel surface and the stable processing of the thickest carbon steel is debugged;
2).After the effect and efficiency meet the requirements, the perforation process parameters are adjusted;
3).After the cutting and perforation process is adjusted, small batch cutting is required to verify the consistency of the process and effect.

Common problems and solutions of carbon steel cutting and debugging of MAX 1500W laser

Thickness and effect                                                               Problem                                                                                                       Resolvent

25mm bright surface                                  1).Heating of cutting nozzle             1). Increase the nozzle size ;2).Dirty lens, clean lens;3). Reduce the cutting focus

30mm bright surface                                  2).Rough cutting surface                 1). Raise the cutting focus;2). Decrease the nozzle size;3). Decrease the cutting gas;4). Increase the cutting speed

40mm frosted surface                                3). Cutting hanging slag                  1).Unsuitable cutting speed;2). Increasing cutting air pressure;3). Unsuitable cutting focus

4). Inconsistent cutting surface       1).The nozzle outlet is not round;2). The laser is not in the center of the nozzle