About the choice of fiber laser for laser cutting machine!
The fiber laser is the only continuous wave laser in this category, because the fiber laser can make the beam spot size less than 25 microns after the beam is focused, so that the high power density required for welding can be obtained. In order to ensure price competitiveness in the field of micro-processing, the power of fiber lasers generally does not exceed 200W, which limits its maximum spot size and cannot provide sufficient power density. Generally, the size of solder joints does not exceed 75 microns. This is one of the biggest limitations of fiber lasers, so in actual production, when adjusting joints/components according to fit tolerances and stacking tolerances, the error range of ±15 mm is often not guaranteed. Fiber lasers are mainly used in lap welding of thinner materials that require high solder joints to ensure stability. The fiber laser uses a lens with a focal length of 150mm to produce a spot with a diameter of less than 25 microns, which brings enough operating space for processing. The fiber laser adopts lap welding to obtain a weld with a penetration depth of 0.01in or even higher than 0.01in at a higher speed; a 200W single-mode fiber laser can obtain a penetration depth of 0.004in at a speed of up to 50in/s. In comparison, pulsed Nd:YAG lasers can meet all applications in this range except for thin foil welding. The laser spot size, pulse width and peak power range are relatively large, so after adjustment and optimization, it can almost meet various welding needs. ◆ 0.01~0.03in weld penetration depth The application classification of pulsed Nd:YAG laser and fiber laser mentioned above is still valid here, but the range is narrow. Pulsed Nd:YAG lasers are used in most spot welding processes, while fiber lasers with a power of about 500W and a spot diameter of 0.01 micron can be used in low-tolerance butt welding and fillet welding. Pulsed Nd:YAG lasers are relatively cost-effective. 500W and 25W power lasers can bring different weld penetration at different welding speeds; peak power can ensure penetration performance and average power can ensure seam welding speed. (The above is edited by a high-energy laser cutting machine, please indicate the source for reprinting!)