In 2023, a Russian supplier came to Date Laser. The account manager accompanied the whole process, explained the principles of our machinery and equipment to the customer, demonstrated the operation process, and guided the customer to operate the equipment by hand. The customer spoke highly of the company and established a long-term cooperative relationship with us.

Professional engineers provide one-on-one training and explanations for customers, and deeply analyze the welding machine models used by customers, from basic settings to advanced functions, one by one, to ensure that customers can operate proficiently and efficiently utilize the potential of the equipment.

On June 24, 2024, the National Science and Technology Awards Conference was held in Beijing. The "Key Technologies and Industrialization of Industrial-Grade High-Power Fiber Lasers" project undertaken by Wuhan Ruike Fiber Laser Technology Co., Ltd. won the second prize of the National Science and Technology Progress Award in 2023. Laser manufacturing is a disruptive technology that comprehensively improves cutting, welding, surface modification and additive manufacturing in the manufacturing industry. It fully meets the urgent needs of modern manufacturing for efficient, high-precision and intelligent manufacturing, and widely empowers national pillar industries such as mechanical equipment, automobiles and ships, and new energy. The project team innovatively solved international problems that need to be solved, such as the suppression of gain fiber photo-darkening and Raman effect, wavelength locking of semiconductor laser pump sources, and improvement of fiber beam output quality. It has created a circular modified double-clad large-mode field fiber laser system and independently developed more than 200 varieties of industrial-grade fiber lasers in 6 categories, covering various high-end fiber lasers urgently needed for laser manufacturing. In the past three years, the high-power fiber lasers developed by the project team have been used by more than 1,500 domestic users for more than 350,000 units, and exported to more than 500 foreign users for more than 50,000 units.

As the power of fiber lasers continues to increase, fiber lasers have been scaled up for industrial cutting. Due to their high beam quality, fiber lasers can achieve very small focal lengths, and the resulting smaller slit widths are new process standards in various fields. According to the mode at the transmission point, optical fibers can be divided into single-mode fibers and multimode fibers. "Mode" refers to the beam of light entering the fiber at a certain angular velocity. Single-mode fibers use solid-state lasers as light sources, and multimode fibers use light-emitting diodes as light sources. The difference between multi-mode and single-mode fiber lasers In cutting applications, the focus point has a great influence on the cutting quality. The core of a single-mode laser is relatively thin, the beam quality is better than that of a multi-mode laser, the energy distribution is a Gaussian distribution, the energy density is the highest in the middle, and the three-dimensional graph is a sharp circle. The shape of a mountain. The core of a multi-mode laser is rougher than that of a single-mode laser. The energy distribution is smaller than that of a single-mode laser. The three-dimensional image is the average value of the single-mode spot. The three-dimensional image is an inverted cup. Judging from the steepness of the edge, the multi-mode ratio is steeper than the single-mode. The cutting speed of a 1mm thin plate is 20% higher than that of a multi-mode cutting speed, but starting from 2mm, the speed advantage gradually decreases. Starting from 3mm, the advantages of high-power multi-mode lasers are obvious in both speed and effect. Which is better? Therefore, the advantage of single-mode is thin plates, and the advantage of multi-mode is thick plates. Single-mode and multi-mode cannot be compared with each other. They are all configurations of fiber lasers. It is like a car. The car is suitable for highways, and off-road is suitable for mountainous areas. However, cars can also drive on mountains, and off-road can also drive on roads, so the choice of multi-mode or single-mode fiber laser depends on the actual processing needs of the end user. Single-mode fiber cores are usually thinner, which means that the same power of laser is transmitted in it, and the light energy carrying capacity of single-mode fiber cores is larger, which is a test of the material. When cutting highly reflective materials, high-intensity reflected light and emitted lasers are superimposed. If the fiber material is not fully tolerated, it will be easy to "burn the core". This is also a challenge to the life of the core material. From the perspective of power level discrimination, lasers below 1000W are mainly due to their low energy. And the thickness of the main processing material is towards thin plates. Therefore, the single-mode configuration within 1KW of the laser meets the actual market conditions. From the perspective of the entire processing industry, improving processing quality is a strict requirement. Lasers with power exceeding 1KW should be thin and thick, so many laser manufacturers still use multi-mode configurations in the configuration of high-power fiber lasers.

Fiber laser marking machine is becoming more and more popular in various fields. Because its price is getting lower and lower. And it is very easy to operate. But there are still some people who have a bad experience with laser machines. They may face many small problems or questions, especially focusing on the focus. Many people don't know how to find the focus. Why do you need to find the focus of fiber laser marking machine? The fiber laser marking machine needs to adjust the working size through the lens. The F-θ lens is a convex lens, just like a magnifying glass. We know that it has a focal length from lens to lens. At this length, all light power is concentrated on one point and has high power. The fiber laser marking machine uses this theory to focus all lasers on one point. The laser will leave marks after high temperature. Therefore, the laser marking machine can only work properly when the machine is in the correct focus. This is why we need to find the correct focus before using the laser machine. How to find the focus of a fiber laser marking machine There are mainly three ways to help us find the correct focus. 1. First, we need to find the focus manually. We can put a small metal piece in the working area and select the "Continue" button. Then we need to adjust the laser marking head up and down and check the laser. When a very strong laser acts on the metal surface, it is the focus. This way is the most common way and easy to learn. 2. Measure the length. F-theta lenses of different working sizes have special focal lengths. We can measure the length from the F-theta lens to the workpiece. There are some problems with this way because there may be some errors in the measurement. After finding the focus in this way, we still need to do some fine-tuning. 3. Red pointer outside. We installed an extra red pointer under the laser marking head. There are two points when the machine is turned on. When the two points coincide, it is the correct focus. Now we install it for all machines. It can save users a lot of time.

The deep penetration welding of the laser welding machine usually uses a fiber continuous laser beam to complete the connection of materials. The metallurgical physical process is very similar to electron beam welding, that is, the energy conversion mechanism is completed through the "keyhole" structure. Under sufficiently high power density laser irradiation, the material evaporates and forms a small hole. This hole full of steam is like a black body, absorbing almost all the incident beam energy. The equilibrium temperature in the cavity reaches about 2500°C. Heat is transferred from the outer wall of the high-temperature cavity to melt the metal around the cavity. The small hole is filled with high-temperature steam, which is generated by the continuous evaporation of the wall material under the irradiation of the ray beam. The four walls of the small hole are surrounded by molten metal, and the liquid metal is surrounded by solid material (in most conventional welding processes and laser conduction welding, energy is first deposited on the surface of the workpiece and then transferred to the internal transfer). The liquid flow outside the hole wall and the surface tension of the wall layer maintain a dynamic balance with the steam pressure continuously generated in the cavity. The beam continuously enters the small hole, and the material outside the small hole flows continuously. As the beam moves, the small hole is always in a stable flow state. In other words, the keyhole and the molten metal around the hole wall move forward at the forward speed of the guiding beam, and the molten metal fills the gap left by the keyhole and solidifies to form a weld. All of the above processes occur so quickly that the welding speed can easily reach several meters per minute. Main process parameters of laser deep penetration welding (1) Laser power. There is a threshold laser energy density in laser welding. Below this value, the penetration depth is very shallow. Once this value is reached or exceeded, the penetration depth will increase greatly. Only when the laser power density on the workpiece exceeds the threshold (related to the material) will plasma be generated, which marks the progress of stable deep penetration welding. If the laser power is below this threshold, only surface melting of the workpiece occurs, that is, welding is carried out with a stable thermal conductivity type. When the laser power density approaches the critical condition for the formation of a keyhole, deep penetration welding and conduction welding will alternately become unstable welding processes, resulting in large fluctuations in the depth of penetration. In laser deep penetration welding, the laser power controls both the depth of penetration and the welding speed. The welding depth is directly related to the beam power density and is a function of the incident beam power and the beam focus. Generally speaking, for a laser beam with a certain diameter, the penetration depth increases with the increase of the beam power. (2) Beam focus. The beam spot size is one of the most important variables in laser welding because it determines the power density. However, for high-power lasers, its measurement remains a difficult problem despite many indirect measurement techniques. The beam focusing diffraction-limited spot size can be calculated based on the light diffraction theory, but due to the aberration of the focusing lens, the actual spot size is larger than the calculated value. The simplest practical measurement method is the isothermal profile method, which uses thick paper to burn and penetrate a polypropylene plate to measure the focus and perforation diameter. This method should be practiced through measurements to master the laser power and beam action time.