Posición de Enfoque en Corte por Láser|Importancia de la Posición del Foco

This video explains the focus position in laser cutting and the importance of the focus position. Our store: https://spierlaser.com Contact: [email protected] +86-13335151833 Hi, I'm Clara. Do you know the importance of the focus position in fiber laser cutting? And what focus should we set for different materials? Today we're focusing on the "focus position." Before entering the main chapter, don't forget to subscribe to this channel and give me a like. Thank you. I'll divide it into four parts to explain the focus position, including positive and negative focus, suitable metal types, and the cutting effect that can occur when the focus position is incorrect. In laser cutting, the focal point is the distance from the workpiece surface. If the focus position is above the workpiece surface, it is generally positive focus, and negative focus is below the workpiece surface. Changing the focal position also means changes in the size of the laser spot on the surface and inside of the workpiece. If the focal length increases, the laser spot will become larger and the cutting gap will become wider and wider, directly affecting the heating area, the slit size, and the slag discharge capacity, which will be directly reflected in the cutting effect. We can see very clearly in this image. As the positive and negative focus changes, the line width of the image also changes. Let's first talk about positive focus. It means the cutting focus is located on top of the target metal plate. We typically use oxygen to cut carbon steel; it is suitable for positive focus. The lower slit width will be wider than the upper slit width, which will help discharge slag and facilitate the passage of oxygen and generate an oxidation reaction. Within a certain range, the higher the positive focus value, the brighter the cut section will be. The following three images are carbon steel cuts, not good. One possible reason is that the focus position is not set correctly. Negative focus will set the focus on the target metal plate. The cutting width on the metal surface is larger and requires a large airflow. Cutting stainless steel is generally suitable for negative focus; it will maintain the cut section well. And the "pierce" before cutting, it is recommended to have negative focus. Piercing requires a height, so negative focus will ensure a small, energy-intensive laser spot. The deeper the piercing position, the higher the negative focus value. The following three images are defective cuts of stainless steel, and one possible reason is that the focus position is too high. 0 focus, meaning the cutting focus is on the surface of the workpiece itself. In this cutting method, the cut section will look like this: the surface near the focus is relatively smooth, while the lower surface farther from the cutting focus is rough. So, if you cut a 5mm sheet with a zero focus, you might see a progressively rougher section. However, zero focus is primarily used for cutting thin plates or sheets of metal. So, what are the factors that determine positive and negative focus? In fact, it's not determined by the material (stainless steel, carbon steel), but by the cutting method (oxidative cutting, fusion cutting). We can find the corresponding applicable focus positions in this table. If you have any other issues with the focus settings, please write them in the comments below or contact me, and I'll try to help. Thank you for joining me today. See you next Tuesday here on my YouTube channel. See you later!