Schlagwort-Archiv: technology

Advantages of Laser Cladding Technology

Compared to other cladding techniques (such as spray tungsten carbide, tungsten carbide spray plasma spray or arc welding), laser cladding is a unique process with fundamental differences in its application. The use of usb laser pointer cladding, a highly focused heat source, has a large impact on the finished product. Laser cladding has many advantages due to its low heat input, high cure rate and accurate process control.

All metallurgical bonding, no spalling, chipping, cracking: Laser cladding has a complete metallurgical bond with the substrate, which means it does not peel or crack like a plasma or thermal spray coating. Little or no voids or porosity: Unlike plasma or thermal spray, laser cladding coating is suitable for fully dense coatings. The low heat input process greatly reduces thermal distortion: laser cladding inputs less than 20% of the heat compared to arcs that cover the same part. The thermal deformation reduction of this component is significant. In many cases, in order to solve the thermal deformation problem, fewer subsequent operations, such as machining and straightening, are required. Thin-walled parts that cannot be covered with an arc can be coated with a 488nm laser pointer due to low heat and deformation.

green laser pointer

Small heat affected zone: Due to the reduced heat input, the heat affected zone is greatly reduced, increasing the strength of the component. Very low dilution: Low heat input also reduces the dilution of the cladding. Reducing the mixing of the base metal and the coating means a purer coating with better metallurgical properties and higher corrosion and wear resistance.

Release Cladding: Due to the lower dilution rate, a thinner coating (compared to arc welding) can impart the same wear or corrosion properties. This can significantly reduce the cost of cladding materials. High solidification speed: Since the solidification speed is fast and the heat input is low, materials such as carbides can be added to greatly improve the wear resistance of the coating. Conventional arc welding processes melt carbide particles. The ability to traditionally “non-weldable” materials: low heat input and fast curing can be coated with materials such as carbon steel or nickel-based superalloys. These materials are difficult or impossible to weld using conventional welding techniques.

Excellent process control, better layer thickness control and surface treatment: waterproof laser pointer cladding provides better control of layer thickness, coating of thinner coatings and better surface finish. The ability to apply a closer net shape coating reduces the amount of finishing required and reduces the amount of excess coating material applied. Infinite Cladding Thickness: Multiple coatings can be applied to achieve any thickness. High repeatability and process stability: Automated control of the process provides excellent parameter control for good process stability and reliable, repeatable results.

High deposition rate: High deposition rates can be achieved, especially with hot wire technology, which can reduce application time. Greatly extend the life of parts: Compared to plasma or thermal spraying and arc welding, laser cladding has excellent corrosion resistance and wear resistance, which greatly extends the life of parts. One of the many advantages of the laser cladding process is that it is compatible with a wide range of material choices, either in wire or powder form; the options for material properties are almost endless.

Material selection: Powder offers virtually unlimited potential for changing alloy composition, allowing the use of carbides and other forms of wire that are not available. Material Capture: Unlike powders, when material is coated with wire filler material, no wasted material. Lower material costs: The cost of wire filler material is much lower than the same material in powder form. Unaffected by gravity: the wire is not affected by gravity and is not affected by the powder, so unsuitable coating can be achieved. 2-5 times higher deposition rate using hot wire: preheating the wire before it enters the bath reduces the laser energy required to melt the fill material, thereby achieving higher deposition using the same military laser pointer power rate.

Technical Essentials of Laser Hybrid Welding

Laser is a beam of light that uses a radiation excitation light amplification principle to produce a monochromatic, directional, and high-intensity beam that is focused by a transmission or mirror to obtain high-density power. It can be used as a heat source for welding, cutting and surface treatment of materials. Laser welding (LW) is a highly efficient and precise welding method that uses a high energy density 488nm laser pointer beam as a heat source. According to the different working characteristics of the laser generator, the laser is divided into solid, liquid, gas, semiconductor and other lasers; according to the laser’s action on the workpiece and the laser output energy, laser welding can be divided into continuous laser welding and pulse laser welding; Power density laser spot welding on the workpiece can be divided into heat transfer welding (through-fusion welding) and deep-fusion welding (keyhole welding, perforation welding, small hole welding).

The laser welding machine is mainly composed of a laser (core part, currently mainly YAG solid-state laser and CO2 gas laser), beam transmission and focusing system, welding torch, work table, power supply and control device, gas source, water source, and operating panel numerical control device. . Mainly used in aviation, electronic agenda, machinery, automotive, medical, food, nuclear energy and other fields.

green laser

Laser welding has its significant advantages: high power density (103W/cm2), small hole welding and high speed welding; laser energy emission, transmission, optical transmission, deflection, focusing through optical methods such as fiber optics, prisms, etc. For micro-parts, inaccessible parts or long-distance welding; one military laser pointer can be used for multiple work on different worktables (welding, cutting, alloying, heat treatment, etc.); laser can pass through transparent objects such as glass. Welding highly toxic materials such as bismuth alloy in sealed containers made of glass; laser is not affected by electromagnetic fields, no X-rays; lasers are not lost in the atmosphere, and vacuum protection is not required; in addition to welding carbon steel and low alloy steel , stainless steel, silicon steel, aluminum, titanium and other non-ferrous metals, under certain conditions, copper-nickel, nickel-titanium, copper-titanium, titanium-molybdenum, brass-copper, low carbon steel-copper, stainless steel-copper and other dissimilar metals The material can be laser welded or non-metal such as metal and ceramic, glass, composite materials, etc. For high melting point metals, non-metallic materials (ceramics, plexiglass, etc.), materials sensitive to heat input. Laser welding is performed without heat treatment after welding. Laser welding has not been widely used mainly: the price is too expensive; the welding parts processing, assembly, positioning requirements are high; the light energy conversion rate is low (10 to 20%).

In order to expand the application range of laser welding, improve the quality of laser welding, increase the thickness of weldments and avoid the limitations of pure laser welding, a new welding process has emerged: waterproof laser pointer hybrid welding. It is important to note that the advantages of laser re-welding are not just The superposition of two welding methods! In particular, the utilization of energy is much larger than the simple addition of two heat sources. The advantage of laser hybrid welding is that the energy utilization rate is improved, the absorption rate of the laser is low when the base material is in the solid state, and the absorption rate of the laser after melting is increased to 50-100%; the penetration depth is increased a lot under the action of the arc The base metal melts to form a molten pool, and the laser acts on the bottom of the arc, and the liquid metal absorbs the laser beam at a high rate. Therefore, the laser hybrid welding is larger than the pure laser welding; the arc is stable, such as separate When welding with TIG or MIG, the welding arc is sometimes unstable, especially in the case of small currents, when the welding speed is increased to a certain value, it will cause arc drift. When laser hybrid welding is used, the laser generated plasma helps to stabilize the arc. Improve the adaptability of butt joint clearance during laser welding, reduce the assembly precision of laser welding and achieve high efficiency.

Laser welding process parameters, pulse laser welding has four main parameters: pulse energy, pulse width, power density and defocusing; continuous green laser pointer welding parameters are: laser power, welding speed, spot diameter, defocus, protection The type and flow rate of the gas; the parameters of the two-beam laser welding include: beam arrangement, spacing, two beam angles, focus position, energy ratio of the two beams, and so on. Laser hybrid welding types include: laser-arc hybrid welding, laser-high frequency welding, laser-pressure welding, laser-brazing, etc. Among them, laser-arc welding is the most common, such as laser-argon arc welding (TIG), laser-gas Welding welding (MIG), etc. According to the relative position of the laser and the arc: coaxial composite, cross composite, deviated composite.

Used in deep plate welding of thick plates, thick plate welding is limited due to the strict assembly requirements of pure laser welding and the high cost of high power lasers. The laser-arc hybrid welding can be used for thick plate deep-fusion welding, and the adaptability to the preparation of the welding groove, the beam neutrality and the joint assembly gap can be improved. It is well applied in the shipbuilding industry. For low-alloy high-strength steel, it can be preheated and welded. The laser-arc hybrid welding can achieve a penetration depth of 15mm for single-pass welding and 30mm for two-way welding. The welding deformation is only double wire welding. 1/10, T-joint with a welding thickness of 16mm can be welded at speeds up to 3m/min.

Applied to usb laser pointer welding of aluminum alloys, laser-welded aluminum alloys have large reflectivity and are prone to problems such as pores, cracks, and composition changes. By laser-arc hybrid welding, due to the action of the arc, the laser beam can directly illuminate the surface of the liquid pool, increasing the absorption rate and increasing the penetration depth. Using AC TIG or DC reverse connection, the oxide film can be cleaned in front of the laser welding, while the molten pool formed by the arc moves in front of the laser beam, increasing the wettability between the molten pool and the solid metal to prevent undercut.

Used in lap joints, lap welds are widely used in automotive frame and floor structures. Many of the current automotive shell welds are galvanized steel lap welds and aluminum plate welds. Laser-arc hybrid welding can reduce the deformation of welded parts, eliminate defects such as undercuts and undercuts, and greatly improve the welding speed. For example, the lap joint of a low carbon steel plate welded by a 10 kW CO2 laser and a MIG arc composite heat source can achieve a lap weld with a gap of 0.5 to 1.5 mm, and the penetration depth can reach 40% of the floor thickness. Another example: 2.7kW YAG laser-MIG arc composite high-speed welding aluminum alloy lap joint, welding speed up to 8m / min.

In high-speed welding of sheet metal, the main problems of laser high-speed welding of sheet metal are poor continuity of weld formation and prone to bump on the surface of weld bead. Using plasma arc assisted YAG or CO2 laser for thin plate (0.14mm) composite welding, the welding speed is twice as fast as that of single laser welding. Even if the welding speed reaches 100m/min, the arc is very stable, and a wider weld path and smooth weld surface can be obtained.

Laser Welding Technology in Medical Devices

With the advent of lasers, people gradually realized that they have strong advantages such as high brightness, monochromaticity and directionality, and they have played an important role in scientific research, military, communications and other fields. Welding technology combines with laser to form a new waterproof laser pointer welding technology, which can effectively break through the limitations of traditional welding technology, and is therefore actively used in automotive manufacturing, aerospace and other fields.

Secondly, laser welding technology has also been widely used in medical and health applications. Due to the demanding requirements of the high cleanliness of its manufacturing process, laser welding technology meets its needs. Compared with other commonly used welding techniques, the laser welding technology produces almost no welding slag and debris, and it is not necessary to add any adhesive during the welding process, so that the entire welding work can be completed in the clean room. The addition of laser welding technology has greatly promoted the development of medical devices, such as the housing of active implantable medical devices, radiopaque markers for cardiac stents, earwax protectors, balloon catheters, etc. .

Implantable medical electronic devices, such as cardiac pacemakers, implantable electrocardiographs, and neurostimulators (spinal cord stimulators, deep brain stimulators, and implantable cochlear implants), are used to manage and treat the body’s physiology Conditions such as heart rate, chronic pain, Parkinson’s disease or severe deafness. In the past decade, patients have rapidly increased the use of implantable medical electronic devices at double-digit rates in order to improve the quality of life. These implantable electronic devices typically consist of microelectronic circuits and batteries that provide energy. In order to protect microelectronic circuits and batteries, they need to be sealed in a metal case. If the seal is lost, the body fluid can directly penetrate into the metal package, causing short circuit failure of the microelectronic circuit and endangering the patient’s life.

Laser welding technology is the most common connection and sealing technology for implantable medical devices. The metal casing of implantable medical devices generally uses titanium and titanium alloys, but titanium has a strong ability to absorb hydrogen, oxygen and nitrogen at high temperatures, so the military laser pointer welding process needs to be carried out in an inert gas-tight environment. In laser welding, the control of laser energy plays an important role in the quality of welding. The laser illuminates the metal surface, which initially reflects 60% to 80% of the laser energy. As the temperature increases, the metal absorbs the laser energy gradually. When it reaches the boiling point, it can absorb nearly 90% of the energy.

The cardiac stent, also known as the coronary stent, is a commonly used medical device in cardiac interventional surgery and has the function of dredging arterial blood vessels. The main material is stainless steel, nickel titanium alloy or cobalt chromium alloy. During the process of transmitting the heart stent to the destination, the radiopaque lines at both ends of the stent can clearly see its trace and open state. The radiopaque markers can be made of precious metals such as gold, enamel and platinum iridium. Riveting, this molding process uses a green laser pointer with a minimum spot diameter of 40 μm (0.04 mm) to weld a disc-shaped marker into a special eyelet.

The gastroscope biopsy forceps used in medical treatment need to penetrate deep into the patient’s body. Therefore, the quality of the biopsy forceps is very demanding. Each component of the composition needs to meet certain tensile strength and good appearance, especially the surface is not allowed. Glitch and other situations. In the previous production process, the front end of the gastroscope biopsy forceps is combined with riveting, resistance welding, etc., and the riveting method will leave burrs and other defects on the surface of the puncture gun, and resistance welding will also produce parts. The large deformation affects the practical application of the puncture gun, and the laser welding technology has the characteristics of non-contact processing, narrow heat influence range, high efficiency, high processing precision, etc., which can realize the flawless, no groove and no crease of the medical field. No burr and no cracking requirements.

Balloon catheter laser welding is the use of laser as the source of energy for infrared welding, which can be directly applied to the surface of the plastic that absorbs the 488nm laser pointer using a laser beam to melt the plastic for welding. The advanced laser welding technology can realize the seamless connection between the balloon tip and the tube body, so that the balloon catheter can be unimpeded when propelled in the curved and narrow diseased blood vessels, the damage to the blood vessel is minimized, and the operation process is safer.

The introduction of laser welding technology is beneficial to further reduce the outer diameter of the balloon dilatation catheter tip. A schematic diagram of the laser welded balloon catheter is shown in Fig. 8. Unlike metal welding, plastic laser welding requires less laser power. The greater the welding laser power, the larger and deeper the heat-acting zone on the plastic part will cause the material to overheat, deform, or even damage, so the laser power should be reasonably selected according to the depth of melting required. The use of plastic laser welding technology in medical devices is far more than the above applications. Plastic laser welding technology is being adopted by more and more medical device manufacturers, and its application prospects will be very bright.

In addition to the application of laser welding technology to the production of medical equipment, there are many other innovative usb laser pointer processing technologies that have great potential in the manufacture of medical equipment, such as laser surface modification, laser cutting, laser drilling and laser micromachining. Research and use of advanced laser processing technology will design more high-quality, high-demand medical equipment.

Fabric Laser Cutting Machine in the Textile Industry

As time goes on, people become more and more dissatisfied with the blandness of clothing, there is no characteristic, began to search for a kind of clothing produced by the creative machine, such a machine produced clothing must have a certain personality , which requires the help of laser equipment!

The continuous development of the times, blue laser technology is increasingly being used in all walks of life, clothing as a traditional labor-intensive industries are also accelerating the pace of technological innovation to adapt to the increasingly fierce international competition. Today, garment CAD technology is gradually being adopted by more and more enterprises, and achieved good results. Fabric laser cutting machine has also begun to gradually optimistic about the strength of the major companies. Its traditional equipment has incomparable advantages, specifically in the following two aspects.

First, cloth laser cutting machine can completely avoid the mistakes caused by manual cutting, improve accuracy. The traditional method to cut the film, if the cloth is thin, the amount of film can be implemented less, but if you encounter large quantities of clothing pieces of the task, this method is very easy to cause the upper and lower parts of the size of the error. Workers are most likely to encounter rework and patching problems during the first phase of cropping.

red laser pointer

As the error caused by the cutting will lead directly to the artificial wear and tear of the test piece and the repair piece, the delay of the time period, and even affect the process of sewing, quarantine, packing and so on, which are delayed, these invisible losses can not be calculated by concrete figures , The direct consequence of this is to extend the order manufacturing cycle. Fabric laser cutting machine can also avoid the manual operation of the cut pieces may cause damage, pollution and irregular edges of the pieces of small problems. For the management of the company, cloth high powered laser cutting machine equipment can use data to help control the work of the various sections of the enterprise.

Second, the fabric laser cutting machine is not only improved on the processing technology of cut pieces, but also can manage the initial discharge. Intuitive figures tell users that computerized discharges are bound to save more material than the discharge of the most experienced crews. These are laser cutting directly to help businesses maximize the use of the fabric, to avoid unnecessary waste.

In addition, because the use of automatic laser cutting system to manage the plate, the data stored by the computer to automatically arrange. We no longer have to spend time looking through the original nesting orders, just click on the computer keys to find the raw data you need, you can call or make changes directly.

Cloth green laser cutting machine applications so that companies no longer have a calculator to calculate how much fabric waste, or because of the delay in the project, how much more cost increase, the surface can be happily accounting save a few percent of the fabric, save the percentage A few of the manual consumption. At the same time, due to the completion of the project ahead of schedule, the production line can easily face another batch of orders, thereby enhancing the competitive edge.

Therefore, in the next few years, cloth laser cutting machine will be the same as garment CAD technology, become a new round of garment manufacturing technology innovation tool.

24

The Perfect Combination of Robot and Laser Welding

Laser welding is the fastest growing field in laser processing technology. Laser welding is the high-intensity laser beam radiation to the metal surface, through the interaction of laser and metal, metal absorption blue laser pointer into heat to melt the metal after the crystallization of the formation of welding. Compared with the traditional welding method, the technology will bring many advantages:

Beam spot is small, processing accuracy doubled. Heat affected zone is very small, high weld quality, easy to produce shrinkage, deformation, embrittlement and thermal cracking and other hot side effects, laser welding pool purification effect, to clean the weld metal, weld mechanical performance is equivalent to or better than the base metal The Can achieve the laser focus of the power and size according to the processing requirements of the dynamic adjustment, while the process of real-time monitoring to achieve a variety of applications possible.

red laser pointer

The use of fiber optic transmission of laser, so that the energy source and processing equipment from the space separation can be difficult to achieve. The light energy generated by the laser can be transmitted through a very small diameter fiber to the far distance of the station, through the robot, to achieve the workpiece welding. A green laser pointer welding robot can replace three to four resistance welding robot, if the full use of laser welding technology, processing a body, in the tooling investment, welding parts preparation, material consumption, body seal and other aspects of the cost will be reduced by about 200 US dollars, Steel utilization can be increased by 50%.

The use of laser welding can save a lot of templates and tooling equipment, so that the workshop area by half, saving investment. In the automotive industry, as a vehicle key components of the body, its value accounts for about 20% of the car, the use of laser welding, can reduce the overlap width and some reinforcement components, but also can compress the body structure itself volume, The weight of the body can be reduced by 56kg. Similarly, for a large number of spot welding in the body transfer, if the welding of a welding head on the edge of the workpiece for welding, the flange width of 16mm, and laser pen welding is unilateral welding, only 5mm, the spot welding to laser welding, each car can save steel 40kg. With the traditional spot welding two pieces of 0.8mm steel stamping parts, an average of 20 points / min, welding torch is 25mm, the speed of 0.5m / min, with laser welding speed can reach more than 5m / min.

Power laser welding machine, host, power supply, table, refrigeration unit split design; the machine into my company’s new condenser cavity, the photoelectric conversion efficiency, excellent beam quality, reflective surface and cooling medium without contact, cavity Long life, easy to replace xenon lamp and no need to adjust the optical path. PLC control and computer control in two ways to choose, the machine output power is stable, reliable performance, compact structure, beautiful appearance, easy to operate, with coaxial, paraxial gas protection device to improve the welding quality; and optional laser cutting Head, for cutting to expand the processing range.

Saving space, miniaturization of the design; change the lights for dimming, routine maintenance is more simple; modular design, easy to achieve functional expansion. Can achieve spot welding, butt welding, welding, sealing, etc .; red laser pointer focus / instruction, precise control, focusing light small, high-precision positioning; with long-term stable work capacity, especially for three companies Time operation; self-diagnosis, protection and early warning function; provide a variety of special industry fixture and control methods, the system easy to achieve and automatic production line matching.

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