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Laser Cutting Process

- Nov 30, 2018 -

As a laser cutting practitioner, it is necessary to fully understand the laser cutting machine, especially during the cutting process, to understand the cutting process and to improve its own operating technology. Today, I would like to share with you some tips on laser cutting, hoping to help you complete the cutting process. 

Focus control 

Stainless steel: (focus is the negative focus) (Adjust the amount of defocus according to the thickness of the plate) 

1: The brighter the focus, the brighter the cut surface. 

2: The scum on the lower surface is: the focus is too high, the speed is too slow, and the air pressure is too small. 

3: The lower the focus, the rougher the cut surface. 

4: The soft residue on the lower surface is: the focus is too low, the speed is too fast, the air pressure is too high, and the power is too high. 

5: Unclear: the focus is wrong, the power is too low, and the speed is too fast. 

Carbon steel: (focus is positive focal length) (adjust the amount of defocus according to the thickness of the plate) 

The lower surface hanging grit is: 

1: the focus is too low; 2: air pressure is too slow; 3: power is too small; 4: speed is too fast. 

The rough surface is: 

1: the focus is too high; 2: the air pressure is too large; 3: the power is too large; 4: the material problem. 

Cutting nozzle and lens 

1. Select nozzle and lens when cutting carbon steel: (carbon dioxide) 

1: lens selection: 

Use (5 inches) lenses when cutting 1-8mm carbon steel. 

Use a (7.5 inch) lens when cutting 8-10 mm carbon steel. 

2: Nozzle selection: 

When cutting 1-6mm carbon steel, use a (Φ1.0 double) nozzle. 

A (Φ2.0) nozzle is used when cutting 8 to 10 mm carbon steel. 

2, nozzle and lens selection when cutting stainless steel: (carbon dioxide) 

1: lens selection: 

Use a (5 inch) lens when cutting 1-4 mm stainless steel. 

A (7.5 inch) lens is used when cutting 4-6mm stainless steel. 

2: Nozzle selection: 

A nozzle (Φ1.5) is used when cutting stainless steel of 1-3 mm. When cutting (nitrogen pressure) 10kg-13kg 

Use a (Φ2.0) nozzle when cutting 3-4 mm stainless steel. When cutting (nitrogen pressure) 13kg-15kg 

Use a (Φ2.5) nozzle when cutting 5-6 mm stainless steel. When cutting (nitrogen pressure) 14kg-16kg 

Auxiliary gas selection 

Air: 1: Used as cutting gas 2: Used as cooling cutting head 3: Used as dust removal in the optical path (protects the lens to extend the life of the lens) 

Oxygen: as a gas (burning) purity of cutting carbon steel 99.5% 

Pure nitrogen: as a gas for cutting stainless steel (cooling), the purity is 99.9% (cutting carbon steel speed is 3/4) 

High purity nitrogen: used as laser gas purity 99.999% 

High purity helium: used as laser gas purity 99.999% 

High purity carbon dioxide: used as laser gas purity 99.999% 

Laser cutting requirements 

1 cutting carbon steel plate within 8mm, the hole diameter should not be less than the thickness of the plate, the cutting plate is within 10mm, the hole diameter cannot be less than 1.2 times the thickness of the plate. 

2 Cutting stainless steel plate within 4mm, the hole diameter should not be less than the thickness of the plate, cutting the plate more than 4mm, the hole diameter should not be less than 1.2 times the thickness of the plate. 

3 If the aperture is outside the above range, use pulse cutting or marking. 

Pulse cutting requirements 

1 speed is 30-50% of a continuous wave. 

2 power is slightly larger than a continuous wave. 

3 The air pressure is about twice that of the continuous wave. Using continuous wave perforation 

Select perforation 

Suitable for carbon steel materials 

1 Ordinary perforation: suitable for cutting carbon steel below 5mm. 

2 Progressive perforation: suitable for cutting 6-8mm carbon steel. (The corresponding parameter P990012 must be modified) 

3 strong perforation: suitable for cutting carbon steel of 10-12mm (blasting method). 

The perforation height is not lower than the cutting height; the perforation pressure is not less than 1.0. 

Introducing reference 

Suitable for cutting stainless steel 

1 When cutting 1-3mm stainless steel, use a single (cut circle or deceleration) method. 

2 When cutting 3-6mm stainless steel, please use two methods (cut a small circle or slow down).

 The air pressure for cutting a small circle is 1.5 times the cutting air pressure. 

Analysis of the causes of craters 

1 piercing time is not enough 

2 air pressure is too large 

3 focus is wrong 

4 perforation height is too low 

5 pulse frequency is inconsistent 

6 power is too big