There is a black spot on the surface of galvanized sheet when cutting with TRULASER2525 laser. How to solve it?

1. Fine cutting slit: the cutting slit of laser cutting is generally 0.10-0.20mm. 2. Smooth cutting surface: the cutting surface of laser cutting is free of burrs, and the surface roughness is generally controlled at Ra:12.5 or above. 3. Fast speed: the speed of laser cutting is much faster compared with the speed of wire cutting, and the speed of cutting a piece of 6mm steel plate can be as high as 1.6m/min. 4. Small thermal deformation: the laser cutting slit of laser processing is fine, fast, and concentrated energy, so it is transmitted to the cut material. Laser processing of the laser cutting slit is thin, fast, concentrated energy, so the heat transferred to the cut material is small, caused by material deformation is also very small. 5. Suitable for the processing of large products: the mold manufacturing cost of large products is very high, laser processing does not require any mold manufacturing, and laser processing to avoid the formation of material punching and shearing collapsed edges, which can significantly reduce the production cost of enterprises to improve the grade of the product. 6. Very suitable for the development of new products: once the formation of the product paper can be immediately after the formation of laser processing, you can get the best quality of the product within the shortest possible time, and the most important thing is that laser processing can be used in the production process. You can get the new product in the shortest possible time. Save material: laser processing using computer programming, can be different shapes of the product material set of cutting, maximize the material? Suitable for laser processing of materials: laser can be high density board, medium density board, plywood, plexiglass panels, steel, stainless steel, aluminum alloy plate, cemented carbide, etc. 9. Laser processing application industry: (1) the current laser processing aspects are mainly elevators, escalators, textile machinery, food machinery, light machinery, refrigeration machinery, printing machinery, photocopying machinery, transportation machinery, etc. (2) laser processing is the most important aspect of the laser processing industry. Printing machinery, copying machinery, transportation machinery, port machinery, transportation machinery, shipping machinery, agricultural machinery, road construction machinery, moving? Transportation machinery, environmental protection machinery and mining, metallurgical machinery and other sheet metal processing.　　(2) The second is the electronics and electrical appliances industry, including medical instrumentation, equipment and control cabinets and boxes, such as sheet metal processing.　　(3) Cutting and molding of various rotors, stators and blades in the motor manufacturing industry.　　(4) Cutting and molding of various kinds of saw blades in the gauge and cutting tool industry.　　(5) Automobile manufacturing industry, including parts, assembly synthesis and manufacturing of components in the assembly line, (6) Advertising, decoration and crafts manufacturing industry. Material Material Maximum Cutting Thickness Positioning Accuracy Machining Accuracy Surface Roughness Ra High Density Board 18mm? 0.03mm 0.10mm ≤12.5μm Medium Density Board? 18mm 0.03mm 0.10mm ≤12.5μm Plywood? 25mm 0.03mm 0.10mm ≤12.5μm Plexiglass board? 25mm 0.03mm 0.10mm ≤12.5μm Steel plate? 16mm 0.03mm 0.10mm ≤12.5μm Stainless steel? 10mm 0.03mm 0.10mm ≤12.5μm?Our supply information is distributed in the following categories, please check: Billboards Sheet metal processing Sanitation Trash cans Hotel lobby supplies Light boxes Other advertising, exhibition equipment Display racks Letter boxes Welding and bonding Conference tables Newspaper racks Fences, fence nets Laser machining Pressure machining Welding processing Building and decoration construction Kiosks Building materials processing Environmental protection equipment processing Cutting Processing Industry Specialized Equipment Processing Other Engineering Contracting Medical Equipment Processing Metal Building Materials Hotel Room Supplies Wire Cutting Processing Non-standard Parts Processing