Why is there a big difference in the effect when processing different materials on the same equipment?

The absorption efficiency and thermal conductivity of different materials vary greatly for lasers, and process parameters need to be adjusted accordingly.
Metallic materials (such as stainless steel, aluminum alloy): A suitable laser wavelength needs to be matched (fiber lasers commonly use 1064nm, which has good absorption for metals), and the power and cutting speed should be adjusted according to the thickness. Thicker plates require higher power + low speed + high-pressure assist gas.
Non-metallic materials (such as ceramics, plastics): Some materials have poor absorption of 1064nm lasers, and it may be necessary to adjust the wavelength (such as CO₂ lasers) or reduce the power to avoid thermal deformation (such as plastics processing to prevent burning).
Highly reflective materials (such as copper, aluminum): It is easy to cause the laser to reflect back to the laser, damaging components. A special high-reflection mode laser is required, or the focus position needs to be adjusted to reduce reflection.

What are the reasons for the large deviation in the size of the workpiece after processing?

Inaccurate laser focus position: Focus shift can cause uneven energy density distribution, and the focus needs to be recalibrated (can be done by trial cutting or using a focus detection tool).
Worktable positioning accuracy error: The guide rail or lead screw may wear out after long-term use, and it is necessary to check and compensate for accuracy (such as through the device's own calibration function or professional instrument calibration).
Unstable laser power: Power fluctuations will affect the amount of material removal, and it is necessary to check whether the laser is working properly or whether the power supply voltage is stable.
Material not fixed firmly: The workpiece is displaced during processing, and the fixture design needs to be optimized to ensure stable clamping.

How to solve the problem of burrs or excessive roughness on the machined surface?

Mainly related to process parameters and equipment status:
Adjust laser parameters: reduce scanning speed, increase power (avoid over-melting), or optimize pulse frequency (high frequency is suitable for fine processing).
Clean the focusing lens: Contamination of the lens can cause the beam to diverge, affecting energy uniformity. It needs to be wiped regularly with a special cleaner.
Check auxiliary gas: When cutting metal, insufficient pressure or flow of auxiliary gas (such as nitrogen, oxygen) can cause slag residue, and gas parameters need to be adjusted.

What could be the reason for the sudden decrease in laser intensity during processing?

Fiber Optic Loss: Excessive bending of the fiber, loose or contaminated connectors can reduce the efficiency of light transmission. Check the fiber path and clean or replace the connectors.
Focusing Lens Wear: After prolonged use, scratches or coating peeling may appear on the lens surface. Replace with a new lens (be sure to select a compatible model to avoid affecting the spot quality).
Laser Power Attenuation: Lasers have a lifespan (typically tens of thousands of hours). If approaching the end of its life, power may decrease. Contact the manufacturer to assess whether the core components need to be replaced.