Laser welding principle - laser is the abbreviation of stimulated emission light amplification of radiation. Due to its unique high brightness, high directivity, high monochromaticity and high coherence, it has been widely used in industrial processing since its birth. It will become a common processing method for future manufacturing systems. Laser welding is a laser beam with high radiation intensity. After the laser beam is focused by the optical system, the power density of the laser focus is 104~107W/cm2. The processed workpiece is placed near the laser focus for heating and melting, and the melting phenomenon can be generated. And the degree of strength generated depends mainly on the time, power density and peak power of the surface of the laser-acting material. By controlling the above parameters, various laser welding processes can be performed using a laser.
The general feature of laser welding - laser welding is a thermal processing process using a laser beam as a heat source. Compared with the electron beam plasma beam and general machining, it has many advantages: (1) the laser beam spot of the laser beam is small, High power density, can weld some high melting point, high strength alloy materials; (2) laser welding is non-contact processing, no tool loss and tool exchange and other issues. The laser beam energy is adjustable, the moving speed is adjustable, and it can be processed by various welding methods. (3) The laser welding has high degree of automation, can be controlled by computer, has fast welding speed and high efficiency, and can be easily welded in any complicated shape; 4) The laser welding heat affected zone is small, the material deformation is small, and no subsequent processing is required; (5) the laser can weld the workpiece in the vacuum container and the workpiece in the internal position of the complex structure through the glass; (6) the laser beam is easy to guide and focus (7) Compared with electron beam processing, laser welding does not require a strict vacuum equipment system, and is easy to operate; (8) laser welding has high production efficiency, stable and reliable processing quality, and good economic and social benefits.
Laser welding in the sensor production process characteristics - laser is used to seal the sensor metal casing is currently the most advanced processing technology, mainly based on laser welding has the following characteristics: (1) high aspect ratio. The weld is deep and narrow, the weld is bright and beautiful; (2) the minimum heat input. Due to the high power density, the melting process is extremely fast, the input workpiece heat is very low, the welding speed is fast, the thermal deformation is small, and the heat affected zone is small; (3) high compactness. During the formation of the weld, the molten pool is continuously stirred and the gas is easily released, resulting in the formation of a non-porous penetration weld. The high cooling rate after welding is easy to make the weld microstructure fine, weld strength, toughness and comprehensive performance; (4) strong weld. High-temperature heat source and sufficient absorption of non-metallic components produce purification, reduce impurity content, change inclusion size and its distribution in the molten pool, no electrode or filler wire is needed in the welding process, and the melting zone is less polluted, making the weld Strength and toughness are at least equal to or even exceed the parent metal; (5) precise control. Because the focusing spot is small, the weld can be positioned with high precision, the beam can be easily transmitted and controlled, the torch and the nozzle need not be replaced frequently, the auxiliary assist time is significantly reduced, the production efficiency is high, the light has no inertia, and the emergency stop can be stopped at high speed. And start again. The use of self-controlled beam movement technology can weld complex components; (6) non-contact, atmospheric welding process. Since the energy comes from the laser, the workpiece has no physical contact, so no force is applied to the workpiece. The magnetic and air have no effect on the laser; (7) due to the low average heat input, high processing precision, can reduce the reprocessing cost, in addition, the laser welding operation cost is lower, which can reduce the cost of the workpiece; (8) easy to automate , effective control of beam intensity and fine positioning.
Plane ruled gratings are characterized by a superior efficiency at their design wavelength compared with holographic gratings. Plane Ruled gratings comprise the majority of diffraction gratings used in spectroscopic instrumentation and are especially useful in systems requiring high resolution.
China star optics can provide customers with a variety of replicated grating products such as diffraction gratings, reflective gratings,holographic gratings,concave gratings etc. to meet different needs. Maximum ruled area is up to 300 x 300 mm for plane ruled diffraction gratings. For replicated diffraction and transmission gratings the ruling density can be from 20 grooves per millimeter to 2400 grooves per millimeter, wavelength from 0.2 micron to 25 microns.
Holographic gratings:
Specifications:
Ruled area: <=70 * 70mm
Wavelength range: 0.2-0.8um
Grooves per mm: 1,200 to 3,600L/mm
Diffraction: >70%
Ruled gratings:
Specifications:
Ruled area: <=70 * 70mm
Wavelength range: 0.2-15um
Grooves per mm: 50 to 2,400L/mm
Diffraction: >70%
Concave gratings:
Specifications:
Ruled area: <=70 * 70mm
Wavelength range: 200 to 900um
Grooves per mm: 490 to 1,200L/mm
Diffraction: >70%
Plane Ruled Grating,Plane Ruled Diffraction Grating,Plane Reflection Grating,Plane Ruled Reflective Grating
China Star Optics Technology Co.,Ltd. , https://www.realpoooptics.com