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Home / News / Details & Solutions to Frequently Occurring Cutting Problems in Fiber Laser Cutting Process

Details & Solutions to Frequently Occurring Cutting Problems in Fiber Laser Cutting Process

Views: 73     Author: Site Editor     Publish Time: 2021-06-11      Origin: Site

In the use of fiber laser cutting machines, many various puzzling problems may arise, why they occur, how to understand them, and what the corresponding solutions are. This article will answer all of these questions.




Several common situations in the cutting process


Situation 1

Situation 1

Power too low, or speed too fast, unable to cut.


Situation 2

Situation 2

Power is too large, cutting speed is too slow, or oxygen pressure is too high will cause melting of the cutting face.


Situation 3

Situation 3

The power is too low, the speed is too fast, the air pressure is too small, or the focus is too high to lead to the disorderly cutting of the lower surface and the slag hanging from the bottom.


Situation 4

Situation 4

Proper power, perfect speed, focus on a defined position, and normal atmospheric pressure will create a bright and slag-free cutting surface.




Detailed analysis of the cutting problem auxiliary analysis diagram


MS:O2 Cutting

Defect

Cause

Solution

No burr, traction line consistent

No burr

Power right
The feed rate is suitable


The traction line at the bottom has a large offset and the cut at the bottom is wider

bottom large

Feed rate is too high
Laser power is too low
Air pressure is too low
The focus is too high

Reduce the feed rate
Increase laser power
Increase the pressure
Reduce the focus

The burrs on the bottom surface are like slag and are spotty and easy to remove

bottom slag

Feed rate is too high
Air pressure is too low
The focus is too high

Reduce the feed rate
Increase the pressure
Reduce the focus

Metal burrs connected together can be removed as a single piece

metal burrs

The focus is too high

Reduce the focus

Metal burrs on the underside are difficult to remove

metal burrs

Feed rate is too high
Air pressure is too low
Gas is not pure
The focus is too high

Reduce the feed rate
Increase the pressure
I'm going to use a purer gas
Reduce the focus

here are burrs only on one side

oneside burr

Incorrect alignment of nozzle
Defective nozzle orifice

Focus Nozzle

Change Nozzle

Material is expelled from above

material expelled from above

The power is too low
Feed rate is too high

This situation appears immediately according to temporary
Stop button to prevent slag dissolving
Splash into the focus lens.
And then increase the power
Reduce the feed rate

Inclined plane cutting
Two good sides make two bad

Inclined plane cutting

Improper, improperly mounted or defective full mirror
The full mirror is installed in the position of the deflector mirror

Check the full mirror
Check the deflector

Blue plasma, workpiece not cut through

not cut through

Processing gas error (N2)
Feed rate is too high
The power is too low

This situation appears immediately according to temporary
Stop button to prevent slag dissolving
Splash into the focus lens.
Use oxygen as a process gas
Reduce the feed rate
Increase the power

The cut surface is not precise

surface not precise

Air pressure is too high
The nozzle is damaged.
The nozzle diameter is too large
The material is not good

Reduce the pressure
Replace the nozzle
Install the appropriate nozzle
Use a material with a smooth and uniform surface

No burr, traction line slanted
The incision becomes narrower at the bottom

bottom narrow

Feed rate is too high

Reduce the feed rate

Produce crater

produce crater

Air pressure is too high
Feed rate is too low
The focus is too high
There is rust on the surface of the plate
The workpiece is overheated
The material is not pure

Reduce the pressure
Increase the feed rate
Reduce the focus
Use better quality materials

Very rough surface

rough surface

The focus is too high
Air pressure is too high
Feed rate is too low
The material is too hot

Reduce the focus
Reduce the pressure
Increase the feed rate
Cooling material

SS:N2 High Press Cutting

Defect

Reason

Solution

Produces tiny regular burrs in the form of dots

tiny burr

The focus is too low
Feed rate is too high

Raise the focus
Reduce the feed rate

Both sides produce long irregular filamentary burrs, the surface of the large plate discoloration

irregular burr

Feed rate is too low
The focus is too high
Air pressure is too low
The material is too hot

Increase the feed rate
Reduce the focus
Increase the pressure
Cooling material

Only one side of the cut edge produces a long, irregular burr

one side irregular

The nozzle is not aligned
The focus is too high
Air pressure is too low
The speed is too low

 Focus nozzle
Reduce the focus
Increase the pressure
Increase speed

The cutting edges are yellow

Nitrogen contains oxygen impurities

Use good quality nitrogen

Generates plasma on a straight section

not cut through

Feed rate is too high
The power is too low
The focus is too low

This situation appears immediately according to temporary
Stop button to prevent slag dissolving
Splash into the focus lens
Reduce the feed rate
Increase the power
Raise the focus

The beam spread

Feed rate is too high
The power is too low
The focus is too low

Reduce the feed rate
Increase the power
Raise the focus

Plasma is generated around the corner

Angle tolerance too high
Modulation is too high
Acceleration too high

Reduced Angle tolerance
To reduce modulation or acceleration

The beam diverges at the beginning

Acceleration too high
The focus is too low
The melted material failed to discharge

Reduce acceleration
Raise the focus
Wear a round hole

Incision is rough

The nozzle is damaged.
The lens is dirty

Replace the nozzle
Clean the lens and replace it as needed

Material is expelled from above

material expelled from above

The power is too low
Feed rate is too high
Air pressure is too high

This situation appears immediately according to temporary
Stop button to prevent slag dissolving
Splash into the focus lens
Increase the power
Reduce the feed rate
Reduce the pressure



Focusing Methods

It is now in the center

rotate right

anticlockwise

low right

rotate right

clockwise

upper left

rotate Left

anticlockwise

left lower

rotate Left

clockwise

upper right

Overall counterclockwise

down

Overall counterclockwise

up

The left is clockwise, the right is counterclockwise

Right

The left is clockwise, the right is counterclockwise

Left



Caution

In order to achieve the best machining quality, please follow the following instructions:
-- Precision adjustment machine tools
-- Carry out maintenance according to the maintenance plan
-- Processing in accordance with the above requirements
-- The workpiece material is pure, and the surface is free of rust or scale (pickled or smooth).
-- The parameters are matched with the specifications of materials and plates
-- Presets associated parameters


When a reduction in machining quality is noticed, check for the following factors:
1. The parameters
2. The processing head
3. Beam path (cutting head)
4. Laser QBH head protective lens


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