Five elements affecting the cutting quality of CO2 lasers

Five elements affecting the cutting quality of CO2 lasers

Lasers are the heart of laser equipment and play a decisive role in the quality of laser cutting. A good laser should have the ideal mode, stable power and other elements. There are many types of lasers, and they can be defined differently from different angles. Different from the medium of excitation, it can be roughly divided into solid lasers and gas lasers, which use different solids or gases as the medium, for example, the earliest laser uses ruby as the medium. The mainstream laser currently used for laser cutting are CO2 lasers, followed by YAG lasers. YAG laser has the characteristics of high photoelectric conversion efficiency and small volume, but its application is greatly limited due to its fast loss of energy pump source and high maintenance cost. The use of carbon dioxide lasers makes it easier to obtain the ideal laser mode and higher energy, coupled with stable performance and short downtime, which is widely used in the cutting of various materials.

Let us talk about some factors that affect the cutting quality of CO2 lasers.

1: Excitation mode. The carbon dioxide laser generates laser light by exciting carbon dioxide gas with an electrode, and can be classified into direct current excitation and radio frequency excitation according to the installation position of the metal electrode.

2: Laser frequency. The laser output is divided into pulse output and continuous output. The laser used for cutting and welding mainly adopts pulse output mode. The pulse frequency mainly affects the cutting speed and the roughness of the slit. To obtain high-speed cutting, high frequency is indispensable. At present, most manufacturers produce carbon dioxide lasers with frequencies below 5000 Hz.

3: beam divergence angle. From a strict point of view, the beam divergence angle is not part of the laser part, but since the mode of the laser has a great influence on the far-field divergence angle, we will discuss it here. The influence of the beam divergence angle on the cutting quality is reflected in the width and slope of the slit. The smaller the divergence angle, the narrower the slit width, and the smaller the slope, the higher the quality.

4: Laser mode. It is one of the most important indicators for measuring laser quality. Can be divided into single mode, basic mode and multimode. The fundamental mode is both TEM00 mode, and its index on the X and Y axes is 0, so it is an ideal dot. The laser with TEM00 mode can obtain the smallest beam diameter, and the smallest slit and faster cutting speed can be obtained in the cutting process because of its small spot size. The multimode is a non-zero index in the XY direction, and its beam quality is poor, and it is generally used only for welding and not for cutting.

5: Laser power. Including peak power, energy stability and other factors. Different power can be cut through the thickness of the metal sheet. For example, a 4KW laser can cut 20mm thick carbon steel, or 15mm stainless steel, 10mm aluminum alloy; and 5KW or more laser can cut 25mm thick carbon steel, stainless steel up to 20mm. Another indicator of power is power stability, excellent cutting quality, and must be excellent throughout the cut. Long-term production is also a very important test for lasers. DC-excited lasers have attenuated power during long-term operation due to electrode ablation. In addition, since some of the vacuum pumps and turbo pumps of the laser are lubricated with lubricating oil, the lubricating oil contaminates the laser cavity and shortens the life of the laser.

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How to Maximum Your Laser Production with  Laser Engraving Systems?

How to Maximum Your Laser Production with Laser Engraving Systems?

The working speed of a laser engraving and cutting machine is now attracting increasingly more attention of laser operators. Since it closely concerns the work efficiency and productivity of your laser business. Hence laser operators are always looking for ways to increase productivity. Are you running your laser as efficiently as possible? Here are a few tips and tricks you can use to ensure that you are operating your laser at its highest potential.


1. A Dual Source Laser System is Worth Considering.

The CO2 laser engraver is a very versatile frequency of laser and works well with wood, acrylic, plastic, glass, marble and much more. What the CO2 systems don’t do, however, is engrave depth into metal, which is where the addition of the fiber laser source comes into play. Depending on the system, you either can switch out the sources, or they both operate in tandem, and you just choose when you want to use each source.

If you have limited shop floor space, a dual source system can also be a very appealing option. If you have the space for only one machine, then a dual source is a great way to maximize/double the productivity of your machinery without needing to expand your physical work space.

2. Engrave Multiple Items in One Batch.

One thing that will reduce production time is printing multiples. If you have a project that requires engraving more than one item of the same or similar design – like plaques or coasters – print multiple pieces at once, instead of one at a time. We’ve found that by engraving in batches, users experience up to a 37% increase in time savings. How many you can engrave at once will depend on your table size, so to do this, you need to expand the page size in your graphic design program to match the full table size of your laser. You can then fill up an entire table with a particular piece and engrave them all in one run. Using a jig to properly space out the items can be helpful as well. At MORN, our engineers are always ready to provide custom laser solution for every application.

3. Adjust the Engraving Resolution.

Resolution is another factor to consider when you want to increase throughput. A clear image is important in any engraving job, but the higher the DPI is, the longer an item will take to engrave. DPI refers to dots per inch, and the higher the DPI the closer together the engraved dots are going to be. This results in a highly detailed engraved image, but may take longer than you’d like. By lowering your engraving resolution a bit, you can increase your time savings by up to 33% or more. Do not reduce the resolution markedly, or the laser engraving machine will not produce satisfying results. Trying to find a balance that can both engrave good laser works and takes less time to produce.

If you are considering expand your laser business by upgrading you laser systems, we are ready to offer professional and customized solutions for you according to your work requirement. Just contact us for more details about our CO2 lasers or fiber lasers!