Laser Transmission Welding

The application of the absorbent is a very important process in the plastic laser welding process. The essence of plastic laser welding is to heat the area of the plastic to be welded to melt, then cooling the natural realization of the bonding of plastic parts. Let the plastic melt the plastic parts to absorb enough laser energy. Usually the ideal absorbent is carbon black, carbon black can be infrared wavelength of the laser energy is basically all absorbed, thereby greatly improving the plastic heat absorption effect, making the heat of the material melting area faster, the better. Some other colors of dyes can also play the same effect of absorbing light waves. There are three ways to add the absorbent: one is to penetrate the absorbent directly into the material to be welded, so that the plastic parts that will penetrate the absorbent should be placed underneath, and the plastic parts without the absorbent should be placed on the surface so that the second green laser pointer is to the plastic parts to be welded to the surface of the seepage of the absorbent, so that only part of the absorbent by the plastic will become a hot zone and be melted; Third, in the two pieces of plastic parts to be sprayed at the contact or Printing on the absorbent.

From the market growth point of view, according to the type of laser, the next five years, the fastest growing market is the direct semiconductor lasers, mainly kilowatt-class high-power semiconductor lasers; the second fastest growing quantum cascade laser, this laser advantage Obviously, widely used, especially in anti-terrorism, security and other applications play an important role in the future of the global quantum cascade lasers will have a huge demand. Fiber lasers will always maintain a steady growth rate. From the application of the laser market, to remove about half of the optical communications market, the current macro-processing is the largest market, followed by micro-processing, the future with the manufacturing industry continues to high-end development, micro-processing market will have a great growing space.

The most commonly used laser welding form is called laser transmission welding, first of all two plastic parts to be welded together with pressure, and then a short wave of infrared blue laser pointer area to the site to be bonded. The laser beam passes through the upper layer of light transmission material and is then absorbed by the underlying material. The laser energy is absorbed and converted into heat energy, since the two layers of material are pressed together. The heat is transferred from the absorber layer to the light-transmissive layer so that the two layers of material are melted and bonded. At the same time due to the thermal expansion of the material itself to expand the internal pressure. Internal pressure and external pressure to ensure the two parts of the solid welding.

The beam quality of the laser output is getting better and better, and the beam quality of the fiber laser has reached a single mode of 100,000 watts. In the past year, fiber lasers, disc lasers, direct semiconductor lasers have a significant increase in brightness. The output wavelength of the laser covers a shorter band, and the short wavelength laser has been widely used. Many advanced manufacturing processes require cold processing, such as in the manufacture of smart phones, often need to use short wavelength, short pulse UV burning laser to deal with. Short wavelength lasers have been widely used in surface marking, semiconductor wafer processing, drilling, cutting and other fields. The pulse speed of the laser is getting faster and faster, and the ultrafast laser has been developed rapidly. It has been driven into industrial applications by means of simpler structure, more convenient operation, lower cost and more stable performance.

Plastic welding process commonly used is a diode laser or semiconductor laser. The beam is in the near infrared region and the wavelength of the beam is between 400 and 1,100 μm, which can be transmitted by fiber. The laser beam in this range can be absorbed by most of the plastic. Diode laser welding system is compact, and the laser can also achieve higher levels of power. The wavelength of the laser can be designed according to the special requirements. The wavelength of the semiconductor laser is generally 808 to 980 μm. Semiconductor laser investment cost is small, small size, high efficiency.

Thermoplastics contain amorphous plastic and semi-crystalline plastic. Plastic that can be laser welded is a thermoplastic. In theory, all thermoplastics can be laser welded. Plastic green astronomy laser welding technology requirements for the welding of plastic: the material in the thermal area of the requirements of the laser light absorption of good; does not belong to the thermal part of the material, the requirements of the light through the good, especially in the This is especially true for two pieces of thin plastic parts. Generally add to the heat in the plastic area of the absorbent can achieve the purpose.

New Applications of Laser Cutting

Compared with the traditional process of spot welding technology, laser welding can be customized weld form, optimize the weld after welding strength, increased design and process flexibility, can be applied to any welding form, any welding direction. At the same time can be customized according to process requirements weld distribution, making the welding force of the optimization can be a perfect realization. Laser welding soldering without contact, flexible weld requirements, can make the welding overlap surface smaller. The use of green astronomy laser welding can reduce the cost of materials to a certain extent and reduce the weight of the body, to ensure the quality of the body on the basis of the maximum to achieve light weight, but also to achieve the purpose of energy conservation.

The challenges of laser welding copper are related to two major physical properties of materials: low absorption rates for most high-power industrial lasers, and high thermal conductivity during processing. We know that the copper absorption rate increases with the decrease of the wavelength, which means that the laser visible band (for example, 532nm wavelength green laser welding for copper) will have a significant advantage, but for the majority of the welding power range required for the application of these burning laser are not available or been industrial verification.

Laser cutting is a process revolution of sheet metal processing, and it is a machining center in sheet metal processing". Laser cutting has a high degree of flexibility, cutting speed, high production efficiency, short product cycle, and has won a wide market for customers. Laser cutting and no cutting force, no deformation; no tool wear material, good adaptability; whether it is simple or complex parts, can be cut with a precision of laser rapid forming; the narrow kerf, good cutting quality, high degree of automation, simple operation, low labor intensity, no pollution; can realize automatic cutting like, nesting, improve material utilization, low production cost, good economic benefit.

Another application that utilizes UV lasers for small beam size and low stress properties is drilling, including through holes, micropores and blind burrs. The UV green laser light system drills through the substrate by focusing the vertical beam straight through the substrate. Depending on the material used, holes as small as 10 μm can be drilled. Ultraviolet lasers are particularly useful for multi-layer drilling. Multilayer PCBs are made of hot press using composite materials. These so-called "semi-cured" will be separated, especially after the use of higher temperature laser processing.

In 2016 the domestic laser processing equipment sales reached 25 billion yuan, according to research projections, in 2020 the laser processing market space will reach 50 billion yuan. In the domestic market, in 2015 the laser marking, cutting, welding of the three main applications accounted for 68% of sales, compared to 2005, the proportion of laser marking equipment sales there has been a significant decline from 65% to 24%, the application of new applications of red laser cutting and welding equipment sales increased significantly from 28% to 44%, because the transformation and upgrading of manufacturing to increase the demand for emerging laser processing equipment.

Laser Cutting Galvanized Steel Plate Technology

Today's sheet metal companies, the use of laser cutting has long been commonplace. The advantage of laser cutting is that it is a non-contact material processing means, so it will not damage the surface of the board, and the cutting surface will not leave a burr, is a can greatly reduce the process after the processing method. However, most powerful laser cutting will encounter a variety of practical difficult to overcome the problem. Here we are concerned about the daily processing of the more commonly used in the galvanized steel cutting difficulties and solutions.

We all know that the role of galvanized steel is through the surface of zinc to protect the inside of carbon steel, long-term use is not easy to rust a plate. Although this plate will be slightly more expensive than ordinary carbon steel plate, but because there is no need for rust and other spray after the process, so the cost of the entire product, or cost-effective.

But after laser processing, the situation is not the same. From the auxiliary gas point of view, the general galvanized steel plate has three cutting processes, namely air cutting, oxygen cutting and nitrogen cutting. We first analyze the three cutting the advantages and disadvantages of their respective processes:

Air cutting: the advantage is very low processing costs, only need to consider the green astronomy laser itself and air compressor electricity can be, without the need to produce high auxiliary gas costs, and cutting efficiency in the sheet can match the nitrogen cutting, is a kind of economic And efficient cutting method. But the shortcomings in the cutting surface is also obvious. First of all, the air cutting section will produce the bottom of the burr, laser processing products must also go through the deburring and other secondary processing, is not conducive to the entire product production cycle. Second, the air cutting section is easy to black, affecting the quality of the product. Therefore, the green laser pointer processing without the need for follow-up can not be reflected, so in the galvanized steel for the processing, many companies are reluctant to choose the way of air cutting.

Oxygen cutting: This is the most traditional and most standard cutting method. The advantage is that the gas cost is low, and in the carbon steel-based sheet metal processing, without frequent switching auxiliary gas, easy to plant management. But the disadvantage is that after the oxygen cut, cut in the surface will leave a layer of oxide, if directly with this oxide products with welding, then a long time, the scale will naturally peel off. This is one of the reasons for the easy soldering of galvanized sheet welding.

Nitrogen cutting: the use of nitrogen for high-speed processing, due to the role of nitrogen is different from the combustion of oxygen, but play a protective role, so the cutting section does not produce oxide. Many companies that is fancy this advantage, so the galvanized steel cutting is often the use of nitrogen for processing. But the shortcomings of nitrogen burning laser pen cutting is here: because the cutting section is completely unprotected, so the product is easy to rust. And in order to prevent the product rust, then had to spray again, the results, more cost to buy back the galvanized sheet, but did not play the characteristics of its galvanized layer, had to say quite a pity.

Three-dimensional Laser Radar

It is understood that the laser radar system and positioning technology can be combined, and then after the surface of the three-dimensional information for high-precision access, in this way in urban roads, dams and tunnels and other aspects of monitoring and modeling at any time. At present, the smallest 300mw laser pointer radar mapping system is only 3kg, can be mounted on unmanned rotorcraft, in accordance with the requirements of the construction of three-dimensional city, airborne measurement system can be a large area of ​​three-dimensional terrain data for fast access, and the ground laser scanning system Is in the space target three-dimensional reconstruction has a great role.

Three-dimensional imaging laser radar can be divided into two categories. The first is the measurement of the three-dimensional lidar; the other is now highly respected, used in unmanned, robotic, etc., used to achieve the obstacle avoidance navigation avoidance type of laser radar. The world's first autopilot experiment is Google. The reason why it chose California is to rely on the local precise 3D map data. The radar system installed in the car measures the surrounding static objects and avoids the data that is not available on the map to reduce the speed of the pressure in time. Which means that the future can be applied to autopilot robots and location-based services and high-precision positioning is closely related, may breed out a billion market.

With the development of 10mw laser pointer radar technology, LIDAR can now be used for power inspection, not only can solve the drawbacks of manpower inspection, complete extraction of power lines from the lidar data, three-dimensional reconstruction of the power line corridor; and, airborne lidar technology It is also possible to obtain three-dimensional coordinates of power lines, power facilities, vegetation and surface structures in a single measurement by laser measurement. It can realize high efficiency and high precision inspection application under the support of digital terrain model and high resolution image.

Laser radar technology from laser ranging technology is the most simple, the gradual development of laser tracking, laser measurement, laser scanning imaging, laser Doppler imaging technology, and developed the laser radar for different purposes. At present, avoid, in the low altitude flight helicopter laser radar obstacle chemical and biological warfare agent detection and underwater target detection in military field has entered the practical stage, other applications are becoming increasingly mature, the commercial value of 5mw laser pointer radar is emerging.

Mapping has an irreplaceable role. At present, civil engineering and planning is the most important source of revenue for laser detection and measurement systems. The introduction of low-cost portable lidar is expected to reform the surveying and mapping industry in the next five years. In particular, with the advancement of technology, the use of LIDAR in the field of agriculture has been explored, including the establishment of farmland topographic maps containing slope and sunshine indices, which help farmers achieve the highest yield by pointing out the key areas that require expensive fertilizers The This shows that both the relatively traditional terrain, geographic information mapping field, or extended out of the new application areas, are not to be underestimated where the 30mw laser pointer radar business opportunities.

Application of Laser Technology

Laser TV is not only have their own table, in the content and the current smart TV no difference. Because the use of laser TV is the TV system, and even many TV brands are also launched laser TV. Their LCD TV and laser TV use the system is similar to the same resources to provide. So use the 2000mw laser pointer TV without worrying about no content. With the gradual enrichment of network resources, laser TV online can see a lot of high-definition content, the latest TV series, movies and entertainment programs can use the laser TV to watch. Past the projector needs a separate device, connect the player or a variety of boxes can see a large, this way OUT out. Laser TV is to see to see, do not worry about no see.

First, not the same place is the light source, laser light source life is very long, easily tens of thousands of hours to laser TV life comparable to LCD TV. Can be said that a laser TV use a three or five years is not a problem, no longer worry about the problem of light, this life cycle has been enough, after all, not all families have to use a TV for 10 years 20 years. Second, the laser TV is a reflection of the ultra-short focus of the technology of the projector, this ultra-short focal length 3000mw laser pointer TV can be achieved within 0.5 meters distance of 100 inches of the screen. In other words, laser TV can be placed in the TV cabinet on the projection of 100 inches, in the past the projector hoisting in the middle of the living room situation gone.

But laser weapons have advantages and disadvantages. For example, in the rain or dust weather, its combat effectiveness will be greatly reduced. The development of laser weapons in the United States, mainly facing the choice of high-energy laser weapons twists and turns, a variety of key technologies have yet to be overcome, research and development costs overdraft progress delay, laser weapons to be miniaturization and other issues, the existence of these problems is also greatly limited The development of burning laser pointer weapons has become a major obstacle to the installation of laser weapons.

Laser TV is able to achieve 100-inch screen, but the screen brightness enough? Brightness is not enough, the screen size is large, but the display is difficult to guarantee. So the brightness is not high, is a laser TV challenge a foundation of LCD. Now the laser TV brightness is basically 3000 lumens. But the rapid development of high power laser pointer light technology is expected in the second half of the release of new products, many began to configure a 4000 or even 5000 lumens of brightness. This brightness and then with the anti-light curtain, even if the lights to watch, the effect is also very to force. Laser TV brightness breakthrough so that this product no longer appear during the day can not be used at night must be dark paint to show the situation. So the brightness of the breakthrough is always a main line of laser TV, it is gratifying that the current laser light source brightness breakthrough faster. It is clear that the development of laser TV is not subject to brightness and stagnation.

In fact, laser weapons are a directional energy weapon. According to different combat purposes, can be divided into tactical laser weapons and strategic laser weapons two categories. Which tactical laser weapons is the use of 5000mw laser pointer as energy, as conventional weapons, as the enemy directly to the enemy, tank aircraft, such as killing damage, combat distance of 20km or so. The strategic laser weapons is more like a "big kill device", can attack thousands of miles away from the intercontinental missiles, but also attack the reconnaissance satellites in space and communications satellites. It can be said that high-base high-energy laser weapons is an ideal weapon to seize the advantages of space, so the world's major military powers are spending money to research and development.

Laser Changes Atmospheric Environment

A British company recently said it is developing a new type of geophysical weapons, that is, the use of laser temporary adjustment of the atmospheric environment, can improve the visual sensitivity of enemy targets, or to prevent high-energy 1mw laser pointer weapons attacks. The new geophysical weapon works by using lasers to change the ionosphere in the Earth's atmosphere, helping to monitor the sensor for better detection of targets or destroying laser weapons aimed at reconnaissance platforms.

This concept uses the Kerr effect, that is, when an electric field is applied to a substance, its refractive index will change. When the high-speed pulsed laser through the atmosphere will produce electricity, can make the ionosphere change to similar lens structure. This lens has two aspects of the role, on the one hand through the refraction to change the propagation path of electromagnetic waves, so that the incident wave is introduced into different directions, so that high-altitude reconnaissance sensors get more condenser, improve the visual sensitivity of the enemy target; On the other hand, you can use the 5mw green laser to create a "plasma", through the reflection and diffraction damage to the propagation of laser beam, to prevent the enemy high-energy laser weapons attack. In addition, this process is reversible, once the stop firing laser pulse, the atmosphere will return to normal state, will not cause harm to the environment.

As the manufacturing industry continues to evolve to the whole process of global trends, lasers are changing the value proposition of some traditional processing methods, such as paper cutting and stamping of materials in the packaging industry. Amazon and some other companies are driving a change from "traditional fixed-size carton packaging" to flexible packaging. The so-called flexible packaging, that is, the use of new plastic materials, and site to create, can fully meet the needs of specific goods.

This new type of flexible packaging is lighter and safe to biodegrade, both to reduce the cost of transportation and packaging, but also reduce the environmental pollution, which is an important future performance indicators of the Amazon. This change can be achieved because the 50mw green laser is different from the tool, they are not blunt, and can provide far more than the mechanical system repeatability and accuracy.

The new multilayer plastic has a strong absorption peak at a particular spectral line within the CO2 spectrum, or the wavelength of the laser can be changed as the plastic layer moves in layers during the cutting process. Instead of a large cutting system, a laser array is required to achieve ablation, with little heat generation, and hundreds of feet per second to cut a large format. The lasers that meet this particular application require high accuracy on a single spectral line with a peak power and average power ratio greater than 100: 1 or higher and a very high pulse frequency (> 10 kHz).

Traditionally, such high peak power and repetition frequencies require Q-switches or other external modulation techniques, which are too expensive for large-scale deployments requiring cost-effective packaging. In contrast, the CO2 100mw laser pointer we are developing are small in size and require no external modulation to achieve peak power on kilowatts and meet the needs of the packaging industry. In fact, the latest trends in the field of manufacturing, medical and materials science are driving the CO2 laser from the value proposition of "power-based price" over the past half century, evolving into "customer-centric, tailor-made" era.

The cutting laser has the most compact structure on the market today and is easy to integrate into the cutting system. Airtight cabinets with built-in drying system for use in harsh production environments, especially for 2D / 3D slab cutting and copper, brass and aluminum cutting. CUT series of new diode pump module, higher power, more cost-effective; new fiber module design, red laser pointer damage threshold increased by 3 times, more reliable performance; digital power module efficiency> 40%, customer operating costs lower; Redundant protection; built-in reliable safety switch <100 ms. At present the CUT series has reached the maximum power of 12 kW, with high cost.

Laser Marking Machine

Laser marking technology is one of the biggest applications of laser processing. Laser marking is the use of 1000mw laser pointer of the workpiece on the local irradiation, the surface material vaporization or color change of the chemical reaction, leaving a permanent marking of a marking method. Laser marking can play a variety of text, symbols and patterns, the character size can be from the order of millimeters to microns, which have special significance for the security of products.

Laser marking machine components: mainly by the four systems: optical system, circuit system, water system and control system. Optical system is mainly composed of red, all-trans, half-reverse, module, Q, field mirror, beam expander, scanning and other components. The circuit system is mainly by the control circuit (control box), high power laser pointer power, Q power, scanning power. The control system is mainly composed of scanning galvanometer, computer, control software (board) and so on. Water system is mainly composed of water tanks, water pipes, forming a circular waterway.

Laser marking machine advantages: laser beam mode is good, the electro-optical conversion efficiency, low power consumption, maintenance-free; some optoelectronic measurement equipment manufacturers measuring the brightest laser pointer light source from the initial He-Ne laser diode laser to obtain The best machine life (He-Ne laser life is generally 10 ^ 4HR, and diode laser life is 10 ^ 5HR, a difference of ten times), especially suitable for on-site long-time operation; instantly can achieve the role of switches, suitable for communication purposes .

And laser marking machine will soon stabilize a boot, and very suitable for modulation of its output circuit, such as pulse wave modulation method can be used to measure the distance (and He-Ne laser marking machine must be switched on after 30 minutes to stabilize ), The use of the periodic table Ⅲ / V family, such as gallium arsenide compounds can be made of diode laser, when the current through the pn interface, the compound will be different And issued a variety of visible 5000mw laser pointer and invisible laser.

As long as the laser to change the ratio of the combination of elements, can change the different energy intervals, different energy intervals, providing a different output wavelength, due to infrared and red wavelength, communication and measurement with a variety of sensors can easily be with Very wide range of uses; simple operation, high precision marking quality; mechanical properties: compact, rugged, small size advantages.

YAG 2000mw laser pointer marking machine series models with the highest cost-effective high-end products - laser marking machine. In recent years with the manufacturing cost reduction has replaced the laser marking machine for laser processing users of the procurement of preferred models, the use of laser marking machine, can greatly save post-maintenance power and supplies costs, get better Of the laser marking effect, and can improve equipment reliability, greatly reducing maintenance.

YAG laser marking machine advantages. Saving lamps: the life of the diode up to 10,000 hours to work eight hours a day basis, up to three years without replacement of supplies; Power: laser marking machine power consumption is only about 2KW, low power consumption; : The laser produced by the laser monochromatic better, better laser mode, the laser focus after the spot is smaller, more focused energy, can achieve better marking effect; maintenance-free: burning laser pointer marking machine is almost maintenance-free , Greatly increasing the stability of the equipment reliability and reduce the workload of routine maintenance.

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زکات علم، نشر آن است. هر وبلاگ می تواند پایگاهی برای نشر علم و دانش باشد. بهره برداری علمی از وبلاگ ها نقش بسزایی در تولید محتوای مفید فارسی در اینترنت خواهد داشت. انتشار جزوات و متون درسی، یافته های تحقیقی و مقالات علمی از جمله کاربردهای علمی قابل تصور برای ,بلاگ ها است.

همچنین وبلاگ نویسی یکی از موثرترین شیوه های نوین اطلاع رسانی است و در جهان کم نیستند وبلاگ هایی که با رسانه های رسمی خبری رقابت می کنند. در بعد کسب و کار نیز، روز به روز بر تعداد شرکت هایی که اطلاع رسانی محصولات، خدمات و رویدادهای خود را از طریق بلاگ انجام می دهند افزوده می شود.

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