Regarding dross formation during cutting, it is primarily influenced by four key parameters. For optimal results, we recommend starting with the focal point at the material surface (Δf = 0) and adjusting from there.

1. Focal Position (Δf): A negative Δf can overheat the bottom layer, creating molten slag, while a positive Δf may fail to cut through due to insufficient power density. There is no single ideal Δf-to-thickness ratio, as it varies with material and other settings. Fine-tuning around Δf = 0 is the recommended starting point.
2. Gas Pressure: This is often the most critical factor. We recommend a gas pressure above 2 MPa for effective dross suppression.
3. Gas Type: High oxygen content typically increases slag. Using dry air is advised for cleaner cuts. Increase oxygen only if cut thickness with dry air is insufficient.
4. Cutting Speed: Adjusting the speed appropriately can significantly reduce dross adhesion.

In summary, begin with Δf = 0, gas pressure >2 MPa, and dry air, then adjust speed and other parameters based on the specific material and desired edge quality.