QCW fiber laser core selection range:from 14um to 200um a variety of fiber core selection,cope with different materials,choose the most fuitable fiber;Optical fiber core pair output the diameter of the spot has a direct effect.Under the same output energy,the size of the spot is positively correlated with the molten pool.At the same time,the smaller the spot,the stronger the puncture force,the deeper the melting depth,different fibers the core can be selected according to different welding requirements with appropriate laser.