Stainless steel: (Decoupling amount adjusted according to plate thickness)
①: The higher the focal point, the brighter its cut surface.
②: Hard residue on the lower surface indicates: the focal point is too high, the speed is too slow, or the air pressure is too low.
③: The lower the focal point, the rougher the cut surface.
④: Soft residue on the lower surface indicates: the focal point is too low, the speed is too fast, the air pressure is too high, or the power is too high.
⑤: If the cut is not thorough, it is due to: incorrect focus, insufficient power, or excessive speed.
Carbon steel: (Decoking amount adjusted according to plate thickness)
Hard slag adhering to the lower surface is:
①: The focus is too low; ②: The air pressure is too low; ③: The power is too low; ④: The speed is too high.
The roughness of the cut surface is:
①: The focus is too high; ②: The air pressure is too high; ③: The power is too high; ④: Material problem.
Selection of cutting nozzle and lens (cutting parameters)
1. Selection of nozzle and lens when cutting carbon steel:
① Lens selection:
Use a 5-inch lens when cutting carbon steel of 1-8mm.
Use a 7.5-inch lens when cutting 8-10mm carbon steel.
②: Nozzle selection:
When cutting carbon steel of 1-6mm, use a nozzle with a diameter of Φ1.4.
When cutting carbon steel of 6-10mm, use a nozzle with a diameter of Φ2.0.
Part Two: Selection of Nozzle and Lens When Cutting Stainless Steel
① Lens selection:
Use a 5-inch lens when cutting 1-4mm stainless steel.
Use a 7.5-inch lens when cutting 4-6mm stainless steel.
②: Nozzle selection:
When cutting 1-3mm thick stainless steel, use a nozzle with a diameter of 1.5mm. The nitrogen pressure during cutting should be 10-13 kg.
When cutting 3-4mm thick stainless steel, use a nozzle with a diameter of 2.0mm. The nitrogen pressure during cutting should be 13-15 kg.
When cutting 5-6mm thick stainless steel, use a nozzle with a diameter of 2.5mm. The nitrogen pressure during cutting should be 14-16 kg.
Types and functions of the gases used
Air: ① Used as cutting gas ② Used as cooling cutting head ③ Used for internal dust removal in the optical path (protects lenses and extends their service life)
Ordinary oxygen: A gas used for cutting carbon steel (combustion-supporting), with a purity of 99.5%.
Pure nitrogen: Used as a cooling gas for cutting stainless steel (99.9% purity; cutting speed for carbon steel is 3/4).
High-purity nitrogen: 99.999% purity gas used in lasers.
High-purity helium: 99.999% purity gas used in lasers.
High-purity carbon dioxide: used as a gas in lasers with a purity of 99.999%.
Size of the cutting hole (distinguishing between material and thickness)
① When cutting carbon steel plates within 8mm, the hole diameter must not be less than the thickness of the plate. When cutting plates within 10mm, the hole diameter must not be less than 1.2 times the thickness of the plate.
② When cutting stainless steel sheets within 4mm, the hole diameter must not be less than the thickness of the sheet. When cutting sheets larger than 4mm, the hole diameter must not be less than 1.2 times the thickness of the sheet.
③ If the aperture exceeds the above range, use pulse cutting or marking.
Pulse cutting (as opposed to continuous wave cutting)
①The velocity is 30-50% of that of a continuous wave.
②The power is slightly greater than that of a continuous wave.
③ The air pressure is about twice that of a continuous wave. Perforation uses a continuous wave.
Perforation method (applicable to cutting carbon steel)
① Normal piercing: Suitable for cutting carbon steel less than 5mm.
② Progressive piercing: Suitable for cutting 6-8mm carbon steel. (Requires modification of parameter P990012)
③ Powerful perforation: Suitable for cutting 10-12mm carbon steel (bursting method).
The perforation height shall not be less than the cutting height; the perforation air pressure shall not be less than 1.0.
Parameters for lead-in wire (applicable to cutting stainless steel)
① When cutting 1-3mm stainless steel, use a single method (cutting small circles or slowing down).
② When cutting 3-6mm stainless steel, use two methods (cutting small circles or slowing down).
③ The air pressure for cutting small circles is 1.5 times greater than the air pressure used for cutting.
Exposed hole
① Insufficient perforation time
② Excessive air pressure
③ Incorrect focus
④ The perforation height is too low
⑤ Inconsistent pulse frequencies
⑥ Excessive power
