Pulse piercing: (drilling Pulse)
The pulse laser with high peak value is used for melting or vaporization of a small amount of material, air or nitrogen gas is used as an auxiliary gas to reduce the heat release and the oxygen pressure of the gas pressure is smaller than the oxygen pressure during the cutting process. Each pulse laser produced only a small particle injection, and gradually deepened, so thick plate perforation time takes a few seconds. Once the perforation is completed, the auxiliary gas is changed to oxygen for cutting.
The perforation diameter is smaller and the perforation quality is better than that of the blasting hole. The laser used in this system should not only have high output power, but also the time and space characteristics of the time, so the general cross flow CO2 laser can not meet the requirement of laser cutting. In addition, a more reliable pneumatic control system is needed in order to realize the gas type, gas pressure switch and perforation time control.
Blasting perforation: (drilling Blast)
The material is formed into a concave hole at the center of the center after the continuous laser irradiation, and the oxygen flow in the coaxial with the laser beam is then quickly removed to form a hole. Hole with the size of the plate thickness, blasting perforation average diameter is half of the plate thickness, so for thick plate blasting perforation diameter larger diameter, not in the higher parts use (such as petroleum slotted screen pipe), can only be used for waste. In addition, because of the same pressure and the cutting of the perforation, the larger the splash.