laser power vs material thickness

It was observed that the inclination of the striation is most affected by the interaction time, with assist gas pressure having a secondary effect and irradiance playing a minor role. The specific energy requirements for cutting are determined. Depending on the material, this gas has may have different functions: Ferrous metals: In ferrous metal cutting, oxygen is used with close to 100% purity. (2006). The main problem with CO2 lasers is that the wavelength of the emitted beam is 10.7 μm. He showed that the cutting quality reduces as the laser intensity increases beyond the threshold limit. Laser cutting of thick ceramic samples by carefully controlling the fracturing of an irradiated area has been studied by Tsai and Chen.78 They focused the Nd–YAG laser to scribe a groove-crack on the surface of a substrate and then an unfocused CO2 laser is used to induce thermal stress. My experience with non-branded Chinese Made lasers. The higher power QCW lasers with 20 kW of pulsed power and 2 kW of average power make it now possible to cut both thick and thin materials utilizing the same laser. Disclaimer: the above data is gathered from various sources which may not be accurate, please contact us for correction. Common laser types For many years, the most common CW laser was the helium neon laser, or HeNe. The chemical composition of the material makes a huge difference. Layer thickness in 3D printing is a measure of the layer height of each successive addition of material in the additive manufacturing or 3D printing process in which layers are stacked. R z = 12.528 ⋅ S 0.542 P 0.528 ⋅ V 0.322. The laser cutting machine cutting speed, cutting speed depends on the laser power density and the cut material thermo-physical properties and thickness. http://am.co.za/ With laser duty cycle %, theoretically Watt ( with occasionally burst to Watt ) of laser energy will be delivered to the material on the cutting table. In this case, the beam wavelength is 1.05–1.07 μm, which can be transported via an optical fibre. This manufacturing specification can vary based on the skill and capabilities of the particular optical shop that is fabricating the optic. Cutting . [ Homepage | Price List | Visit Us ], Molybdenum Plated Laser Reflecting Mirror, Silicon Mirror Plated with Multi-layer Dielectric Film, K9 Crystal Glass Gold-Plated Laser Reflecting Mirror, Zinc-Selenide (ZnSe) Lens with Two Sides Anti-Reflection (AR/AR) Coating, Poly (methyl methacrylate), Acrylic Glass, Perspex, Plexiglas, Plexiglass. However, these rates are significantly higher than those for other thermal cutting processes. Cut speed versus incident laser power for LoPOx cutting of 20mm-thick mild steel plate using a 3.5mm co-axial nozzle. This favours the melting of the material by increasing the temperature of the cut area. Regarding process parameters, it is necessary to adjust the energy depending on the material and thickness of the part. The automotive industry, for example, uses Nd:YAG lasers for 3D cutting of vehicle bodies. They showed that the energy efficiency was higher than the exergy efficiency, which reduced with increasing laser output power. Profiling can reduce this rate to 21mms−1. Machining of carbon composite materials with the excimer laser was investigated by Hodgson et al. It is not recommended to continuously process for a long time. Wavelength is µm for laser. Dual focus lenses have also been shown to offer some improvement (Powell et al. Thicker material requires more power and more time. The rule of thumb is: For every 1 mm of acrylic sheet thickness, 10 watt of laser power must be used to achieve a high quality cut. The process is frequently used in high volume applications using automation, as in the automotive industry.It is based on keyhole or penetration mode welding. The maximum cutting rate (production rate) is limited by a number of factors including laser power, material thickness, process type (reactive or inert), and material properties. When engraving a material like wood at 100% power, you would see the following changes in speed used to achieve the same depth depending on the power of your laser tube: 30w – 20% speed. Ideas have included supersonic assist gas jets coaxial to the laser beam, O’neill et al. #2 There is no absorption problem of laser light from either a Nd:YAG (1.06 microns) or CO2 (10.6 microns) laser in nitrogen, or in air without contaminants. This situation is controlled by the laser cutting parameters, such as cutting speed, laser power output, etc. Effectively utilizing the speed benefits from high power Fiber lasers takes careful planning and management of … “Maximal thickness depends on various factors, including laser power and how it is applied.” On the subject of reflectance, Sarrafi added: The thermomechanical effects of Nd:YAG laser irradiations on fiber-reinforced composite materials were investigated by Goela and Tulsyan (1). This latter process uses the higher density of water to scour the kerf. Pulsed CO2 laser cutting of Si3N4 engineering ceramics has been studied by Hong et al.82 They developed a model to investigate the effect of the cut front shape on the absorption of the laser beam. Laser damage threshold indicates the maximum amount of laser power per area that a surface can withstand before it is damaged. They used a focused CO2-laser beam to scribe a straight line on the substrate and then an unfocused CO2-laser beam was used to irradiate the scribing line to generate a tensile stress and separate the different parts of the substrate. Since the assisting gas is at high pressure, convection cooling results in high cooling rates in the cutting section while forming a brittle and dense layer at the kerf surface; in which case, thermal stress levels become high in this region. Power is how powerfully the laser fires regardless of speed. They could produce both straight and curved profiles. However, laser cutting of brittle materials can often result in undesirable micro-cracking, cut path deviation and undesirable heat effects such as recasts, spatter and debris. Steen, in Advances in Laser Materials Processing, 2010. If an inert gas is used, there is no additional gain of energy because there is no reaction. This characteristic permits the installation of a cutting head in a robot or any machine capable of guiding the head, and the transportation of the beam through fibre. 5. The first experiments on gas assisted laser cutting were performed by TWI in 1967, using a prototype slow flow 300W pulsed CO 2laser. Comparison between a diode laser cut soda-lime glass edges (a) and mechanical cut edges (b), by The University of Manchester [1]. Generally speaking, the larger the laser power, the thicker the cutting board and the faster-cutting speed. Figure 2. Twice as thick takes more than twice as long to cut through. http://am.co.za/ Since a laser is a light, it will lose power on propagation and reflection, and tends to be more complex when the machine size is larger. On the other hand, it is important to maintain the focal position at the same distance. It was concluded that a glass substrate can be divided along chosen path with this dual-laser beams system and the cutting quality is improved compared with cutting using an unfocused laser beam alone. Most Ortur and Neje laser machines claim to be equipped with 15/17/20 watt lasers. Copyright © 2021 Elsevier B.V. or its licensors or contributors. A simple relationship is that cut thickness scales with power and is inversely proportional to speed. They introduced a factorial analysis for different processing parameters and employed the statistical tests to identify the significant levels of each factor. In recent years, the majority of HeNe applications have switched to visible laser diodes. Go to Laser G-code Generator and select Load G-code to Workspace to load the generated G-code to Workspace. 2.2) can be achieved. In addition, Nd:YAG cutting is somewhat more expensive than CO2 laser cutting. Finally, it was found that tiles with a thickness of up to 13 mm can be cut with an acceptable cutting speed at a laser power of 1200 W. A dual-laser-beam method was proposed by Jiao and Wang87 to cut glass substrates to improve the cutting quality. Fig. http://am.co.za/ Laser beam's widest diameter is mm, therefor all mirror sets and lenses should be chosen with required diameter larger than mm. In general, the thicker the steel sheet, the more power required to cut it, and the optimum cutting rate is largely determined by the ratio of thickness to the strength of the laser’s beam. By continuing you agree to the use of cookies. Stainless steel and carbon steel plates of various thicknesses were cut at a laser power of 6-kW. “Reflectance is the major factor regarding the type of material which can be cut, and here the laser technology used (e.g., CO 2 vs fiber laser) has a major impact,” said Buholzer. http://am.co.za/ We will not take responsibility for your purchase decision purely based on this data. Almost all metals and ceramics can be cut with Nd:YAG lasers, although there can be problems with non-metallic materials that are transparent at this wavelength, such as glass, quartz or many polymers. http://am.co.za/ Stronger pressure cutting air sources may be required if you are going to employ the melt and blown cutting method for non-metal materials, especially plastic materials. Ji et al.79 have presented a laser crack-free cutting method for Al2O3 ceramics by a single-pass process. It was concluded that a reduction of process-induced crack formation is vital for the commercial use of lasers in cutting ceramic tiles. Laser cutting of brittle materials such as ceramics, semiconductors and glasses overcomes the difficulties of mechanical machining in terms of tool wear and cutting speed. Many sheet metal applications with material thickness ranging from 0.03 to 0.08 inch (0.75 to 2 millimeters) are welded at higher speeds, while thick-section welding applications tend to require slower travel rates. After creating a cut front, a cut is made by traversing the laser across the material with the assist gas blowing the molten film formed on the cut front out of the kerf. http://am.co.za/ You are always more than welcome to do a test cut on your material with our demo machines. But the relationships still hold and provide a starting point for the user. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. 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Laser cutting of titanium with pulsed Nd: YAG laser was carried out by Maher and Tong (1998). Will deliver Depth Of Field ( DOF ) of mm and deliver energy to each mm2 is W and bursts to W occasionally.

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