Some common laser technologies

by:Lxshow     2021-07-20

Laser perforation

Pulse laser can be used for perforation. The pulse width is 0.1~1 millisecond. It is especially suitable for drilling micro-holes and special-shaped holes. The hole diameter is about 0.005-1 mm. Laser drilling has been widely used in the processing of jewel bearings, diamond wire drawing dies, chemical fiber spinnerets and other workpieces of clocks and instruments.

Laser cutting, scribing and engraving

In shipbuilding, automobile manufacturing and other industries, continuous CO2 lasers ranging from one hundred watts to ten thousand watts are often used to cut large workpieces. Ensure precise spatial curve shape and high processing efficiency. For the cutting of small workpieces, medium and low-power solid lasers or CO2 lasers are commonly used. In microelectronics, lasers are often used to cut silicon wafers or cut narrow slits, which are fast and have a small heat-affected zone. The laser can be used to engrave or mark the workpiece on the assembly line without affecting the speed of the assembly line, and the engraved characters can be permanently maintained.

Laser fine-tuning

Using medium and low-power lasers to remove some materials on electronic components to achieve the purpose of changing electrical parameters (such as resistance, capacitance, and resonance frequency, etc.) . Laser fine-tuning has high precision and fast speed, which is suitable for mass production. Similar principles can be used to repair defective integrated circuit masks, repair integrated circuit memory to improve yield, and can also perform precise dynamic balance adjustment on the gyro.

Laser welding

Laser welding has high strength, small thermal deformation, and good sealing. It can weld materials with large disparity in size and properties, as well as high melting point (such as ceramics) and easily oxidized materials. Laser-welded cardiac pacemakers have good airtightness, long life, and small size.

Laser heat treatment

Using the laser to irradiate the material, select the appropriate wavelength and control the irradiation time and power density, the surface of the material can be melted and recrystallized to achieve the purpose of quenching or annealing. The advantage of laser heat treatment is that the depth of heat treatment can be controlled, the heat treatment position can be selected and controlled, the deformation of the workpiece is small, the parts and components with complex shapes can be processed, and the inner walls of blind holes and deep holes can be processed. For example, the life of the cylinder piston can be prolonged after laser heat treatment; laser heat treatment can restore the silicon material damaged by ion bombardment.

Strengthening treatment

Laser surface strengthening technology is based on the two processes of high energy density heating of the laser beam and rapid self-cooling of the workpiece. In the laser surface strengthening of metal materials, when the energy density of the laser beam is At the low end, it can be used for the surface phase change strengthening of metal materials. When the laser beam energy density is at the high end, the surface spot of the workpiece is equivalent to a moving crucible, which can complete a series of metallurgical processes, including surface remelting and surface layer increase. Carbon, surface alloying and surface cladding. The material substitution technology triggered by these functions in practical applications will bring huge economic benefits to the manufacturing industry.

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