Laser cutting is a process that uses a laser to cut different materials for both industrial and more artistic applications, such as etching.
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This article is one of a series of TWI frequently asked questions (FAQs).
Laser cutting uses a high-power laser which is directed through optics and computer numerical control (CNC) to direct the beam or material. Typically, the process uses a motion control system to follow a CNC or G-code of the pattern that is to be cut onto the material. The focused laser beam burns, melts, vaporises or is blown away by a jet of gas to leave a high-quality surface finished edge.
The laser beam is created by the stimulation of lasing materials through electrical discharges or lamps inside a closed container. The lasing material is amplified by being reflected internally via a partial mirror until its energy is enough for it to escape as a stream of coherent monochromatic light. This light is focused at the work area by mirrors or fibre optics that direct the beam through a lens which intensifies it.
At its narrowest point, a laser beam is typically under 0. inches (0.32 mm) in diameter, but kerf widths as small as 0.004 inches (0.10mm) are possible depending on material thickness.
Where the laser cutting process needs to start anywhere other than the edge of the material, a piercing process is used, whereby a high power pulsed laser makes a hole in the material, for example taking 5-15 seconds to burn through a 0.5-inch-thick (13 mm) stainless steel sheet.
This process can be broken down into three main techniques - CO2 laser (for cutting, boring, and engraving), and neodymium (Nd) and neodymium yttrium-aluminium-garnet (Nd:YAG), which are identical in style, with Nd being used for high energy, low repetition boring and Nd:YAG used for very high-power boring and engraving.
All types of lasers can be used for welding.
CO2 lasers involve the passing of a current through a gas mix (DC-excited) or, more popularly these days, using the newer technique of radio frequency energy (RF-excited). The RF method has external electrodes and thereby avoids problems related to electrode erosion and plating of the electrode material on glassware and optics that can occur with DC, which uses an electrode inside the cavity.
Another factor that can affect laser performance is the type of gas flow. Common variants of CO2 laser include fast axial flow, slow axial flow, transverse flow, and slab. Fast axial flow uses a mixture of carbon dioxide, helium and nitrogen circulated at a high velocity by a turbine or blower. Transverse flow lasers use a simple blower to circulate the gas mix at a lower velocity, while slab or diffusion resonators use a static gas field which requires no pressurisation or glassware.
Different techniques are also used to cool the laser generator and external optics, depending on the system size and configuration. Waste heat can be transferred directly to the air, but a coolant is commonly used. Water is a frequently used coolant, often circulated through a heat transfer or chiller system.
One example of water cooled laser processing is a laser microjet system, which couples a pulsed laser beam with a low-pressure water jet to guide the beam in the same manner as an optical fibre. The water also offers the advantage of removing debris and cooling the material, while other advantages over dry laser cutting include high dicing speeds, parallel kerf, and omnidirectional cutting.
Fibre lasers are also gaining popularity in the metal cutting industry. This technology uses a solid gain medium rather than a liquid or gas. The laser is amplified in a glass fibre to produce a far smaller spot size than that achieved with CO2 techniques, making it ideal for cutting reflective metals.
Dive deep into the world of laser cutting, where precision meets innovation. Laser cutting, a technique revered by industries for its accuracy and efficiency, has multiple facets. Each type of laser cutting method has its advantages, challenges, and ideal applications. Lets explore these methods in detail to find the perfect fit for your needs.
What is Laser Cutting?
Laser cutting is a non-contact process that uses a laser beam to slice materials. It is characterized by its precision, speed, and versatility, making it a popular choice for various industries. The term laser stands for Light Amplification by Stimulated Emission of Radiation. Essentially, it involves the use of a concentrated laser beam to melt, burn, or vaporize the material, resulting in cleanly cut edges.
What are the Different Types of Laser Cutters?
Delving deeper, we encounter diverse laser cutting machines, each with its unique properties and applications.
These powerful machines, the fiber laser cutters, dont merely boast of their prowess without reason. The fiber laser cutting anatomy traces back to banks of diodes, fibered together to bring forth a high-intensity laser beam, which is truly ideal for cutting.
In fact, these diodes, housed in compact modules, generate light that is channeled and amplified through fiber-optic cables. When this light emerges from the fiber-optic cables, it retains its power and quality, and with proper adjustments, becomes tailored for material cutting.
Fiber laser cutters make it possible to trim objects with a depth of less than 5 mm more quickly and efficiently than CO2 laser cutters.
A fiber laser typically has a long operational life of a minimum of 25,000 laser hours and requires no servicing. Fiber laser cutters can therefore create powerful and steady rays and offer a far longer lifespan compared to the other different sorts of lasers. They share the equivalent average output as CO2 lasers but can achieve levels that are 100 times greater.
Fiber lasers can operate in a constant projectile, quasi-continuous beam, or pulsed modes, providing them with a variety of functionality. The MOPA is a fiber laser technology subtype with variable pulse lengths. Which gives the MOPA laser the title of the most adaptable laser, with a wide range of potential uses.
Fiber lasers have paved their way into the industry by presenting several compelling benefits:
But with the glittering benefits, there are shadows cast by certain limitations:
Its imperative to know where fiber lasers shine brightest. Their prowess is witnessed in materials like:
The financial spectrum for fiber lasers usually oscillates between $20,000 to $500,000, contingent on power and brand. Maintenance, albeit minimal, is crucial:
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When we speak of CO2 laser cutters, we refer to machines with a pedigree rooted in a gas mixture dominated by carbon dioxide. These laser cutters have earned their stripes due to their aptitude for a vast array of materials. Unlike the compact diode setup in fiber lasers, the CO2 resonator is substantial.
CO2 laser cutting relies on electricity mingling with a blend of gases to produce the laser beam. Intensity is achieved through mirrors, but as the beam journeys towards the lens, traversing multiple cooled mirrors, theres an inevitable power and quality drop.
The strongest CO2 lasers can produce many Kilowatts of energy for industrial machinery, although they are the only exception to the rule. A common CO2 laser for cutting has a strong range of between 25 and 100 Wattage and a frequency of 10.6 micrometers.
The CO2 laser cutters come equipped with their own set of advantages:
But like any technology, they have their share of challenges:
The CO2 laser cutters are no slouches when it comes to versatility:
A CO2 laser cutters price bracket ranges from $8,000 to $50,000, influenced by size and capabilities. Maintenance for these machines is slightly demanding:
Among the main types of lasers, Nd:YAG (Neodymium doped Yttrium Aluminum Garnet) and Nd:YVO (Neodymium doped Yttrium Ortho Vanadate) lasers, often called crystal laser cutters, stand out. As one delves into the nuances of laser cutting technology, it becomes evident that these solid-state lasers have carved a niche for themselves in various industries, thanks to their versatility and power.
Understanding the advantages of Nd:YAG/Nd:YVO lasers brings to light why many industries prefer them for precision work. Primarily, these lasers are heralded for their engraving and marking capabilities. Their power density is so intense that they can engrave even the hardest materials with great precision.
Their ability to be transmitted through fibers enhances their versatility. It means that they can deliver their laser beam to areas that might be challenging for other types of lasers. This transmission ensures a high degree of precision, which is paramount in industries where minute details matter.
While Nd:YAG/Nd:YVO lasers offer unparalleled precision, they also come with certain limitations. The high initial costs can be prohibitive for smaller businesses or those just venturing into laser cutting. Furthermore, their versatility in terms of materials isnt all-encompassing.
When it comes to applications and materials, Nd:YAG/Nd:YVO lasers shine in certain domains. Theyre especially adept at handling metals such as titanium, nickel, and steel. Beyond metals, they also have proficiency in working with ceramics and specific plastics.
The financial aspect is often a determinant in choosing a laser cutting machine. Nd:YAG/Nd:YVO lasers generally range between $60,000 to $200,000. Factors influencing this range include the power source, brand, and additional features. When considering the cost, its also wise to factor in the unparalleled precision and capabilities they offer.
Maintaining any sophisticated machinery is paramount to ensure its longevity and performance. For Nd:YAG/Nd:YVO lasers, this means:
Venturing into the realm of Direct Diode Lasers, we find devices known for their exceptional efficiency. They stand out among the main types of lasers as they use diodes directly to produce the desired wavelength. For those diving deep into laser cutting processes, Direct Diode Lasers offer a combination of speed and compactness.
Direct Diode Lasers are rapidly gaining popularity for several reasons. Their superior electrical efficiency makes them a cost-effective choice in the long run. Their compact design ensures they fit well even in places with limited space. The quick processing times further add to their allure, making them a favorite among industries where time is of the essence.
While Direct Diode Lasers bring several benefits to the table, theyre not without their disadvantages. One primary concern is their beam quality, which might not match up to other laser types. Moreover, theyre restricted in terms of cutting thickness, which can limit their applications.
Direct Diode Lasers have specific areas where they excel. When it comes to metals, theyre particularly effective with thin sheets of steel and aluminum. Beyond metals, plastics like Polymethylmethacrylate and polycarbonate are well-suited to these lasers.
The price range for Direct Diode Lasers hovers between $50,000 to $150,000. The variation in cost can be attributed to factors like power, brand reputation, and additional features.
Regular maintenance ensures the longevity and efficient performance of Direct Diode Lasers. Key maintenance tasks include:
What Are the Things To Consider when Choosing the Laser Cutting Type?
Laser cutting, an ever-evolving technology, offers an array of choices catering to diverse needs. By understanding the intricacies of each type, one can make an informed decision, ensuring efficient and precise outcomes.
FAQs
The CO2 laser cutter, with its versatility and broad range of applications, remains one of the most popular laser cutting types. Suitable for both metals and non-metals, its wide spectrum of uses, from engraving to sheet metal fabrication, has made it a favored choice across industries.
Fiber lasers are often considered the most universal laser cutting type. Their ability to efficiently cut various metals, coupled with their high-speed processing and superior wall plug efficiency, makes them a go-to choice for diverse applications. Their adaptability is further accentuated by their capability to work with reflective materials, a feature not all laser types offer.
Fiber laser cutters stand out for their minimal maintenance requirements. Unlike CO2 lasers, which demand regular check-ups due to their gas circulation and mirror control systems, fiber lasers are virtually maintenance-free. This makes them an attractive option for manufacturers seeking reduced operational disruptions and costs.
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