In addition, special 'laser grade' steels have been developed with compositions which are claimed to be beneficial for laser cutting, and th… Our TruCUT 90W CO2 Laser is suitable for laser marking, laser cutting and laser engraving which is the ideal choice of laser cut on thin plates include perspex, softwood etc, http://am.co.za/ laser cloth cutting and marble marking. They presented the temporal variation of the melt profile for various metals. In addition, Nd:YAG cutting is somewhat more expensive than CO2 laser cutting. After making these changes the time to cut two hundred 10 mm diameter holes spaced at 15 mm intervals changed from 2 min 24 s to only 47 s. This is a speed which is barely achievable with a punch tool. http://am.co.za/ In addition to the packaging industry, this Laser is also popular in the signage industry with the prominent usage of perspex, light guiding plates and display screens. Laser cutting of titanium alloy sheet was examined by Deng et al. http://am.co.za/ For exceptionally clean cuts, very high gas pressures can be used. 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. The standard nozzle, which is the short nozzle with the large hole (7 mm diameter), is suited for both laser cutting and laser engraving applications. Cutting . The gas pressure can increase up to 20 bars, although it is unusual to reach such high values of pressure. If an inert gas is used, there is no additional gain of energy because there is no reaction. The higher the laser beam power density, the quicker the material is brought to a molten state, the faster the feed rate. Twice as thick takes more than twice as long to cut through. 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. Figure 5.12. 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. Figure 5.14 shows the maximum thickness that can be achieved at different powers of CO2 lasers for aluminium, stainless steel and carbon steel sheets (Trumpf, 2000). Yilbas (11) investigated the laser cutting of plastics. They indicated that momentum coupling coefficient varied linearly with the laser intensity while the specific mass removal rate was independent of the laser beam intensity. Laser beam welding (LBW) is a welding technique used to join pieces of metal or thermoplastics through the use of a laser.The beam provides a concentrated heat source, allowing for narrow, deep welds and high welding rates. High temperature oxidation reactions result in sideways burning around the cut edges while lowering the cutting quality. Disclaimer: the above data is gathered from various sources which may not be accurate, please contact us for correction. They examined the cut section morphology for different assisting gases. It was stated that the use of oxygen as an assist gas leads to a slight increase in cutting speed. Piercing is a drilling process (see Section 1.4.2). They showed that Kevlar composites could be cut with high quality while graphite composites were difficult to cut with required quality. Control of thermal inputs in cutting ceramic/ semiconductor/glass materials is therefore critical in the success of the cutting process. We have compiled this guide for the laser system that we sell, which gives you a good idea of all kinds of materials that a laser can mark, engrave, drill and cut from … Figure 1 – A simple diagram of average power and peak power, where the peak power is 10 W, the duty factor is 20% and the average power is 2 W. Selecting a Power Sensor for a Pulsed Laser Let’s talk about how this relates to measuring your laser with a power sensor . 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 energy efficiency associated with the hole cutting process, therefore, is influenced by these parameters. They could produce both straight and curved profiles. It was demonstrated that the most critical factor arising from the use of the CO2 laser to cut ceramic tiles is crack damage, which is caused by a high temperature gradient within the substrate. (Thickness up to 20-25 mm) Determining which lens should be used © Bates Trust, Advanced Machinery ™ http://am.co.za/ . This favours the melting of the material by increasing the temperature of the cut area. Laser cutting of glass, Kevlar, and graphite composites were studied by Chen and Chen (8). This manufacturing specification can vary based on the skill and capabilities of the particular optical shop that is fabricating the optic. A 4,000-watt laser can process up to 1.0-inch-thick carbon steel, and a 6,000-watt laser can process 1-5/8-inch-thick carbon steel. Comparison between a diode laser cut soda-lime glass edges (a) and mechanical cut edges (b), by The University of Manchester . They also looked into the effects on cutting of using various shield gases. More precisely, when we cut a piece of material we notice that the kerf, or the thickness of the cut, depends on the overall energy that we are focusing onto a point on a work surface. A.Z. 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