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Processing丨Learn about laser welding

First, the process parameters of laser welding 1. Power density Power density is one of the most critical parameters in laser processing. With higher power density, the surface layer can be heated to the boiling point in the microsecond time range, resulting in a large amount of vaporization. Therefore, high power density is beneficial for material removal processes such as punching, cutting, and engraving. For lower power density, it takes several milliseconds for the surface temperature to reach the boiling point. Before the surface vaporizes, the bottom layer reaches the melting point, which is easy to form a good fusion welding. Therefore, in conduction laser welding, the power density is in the range of 104~106W/cm2. 2. Laser pulse waveform Laser pulse waveform is an important issue in laser welding, especially for thin sheet welding. When the high-intensity laser beam hits the surface of the material, 60-98% of the laser energy on the metal surface will be reflected and lost, and the reflectivity varies with the surface temperature. During the action of a laser pulse, the reflectivity of metals varies greatly. 3. Laser pulse width Pulse width is one of the important parameters of pulsed laser welding. It is not only an important parameter that is different from material removal and material melting, but also a key parameter that determines the cost and volume of processing equipment. 4. Influence of defocus amount on welding quality Laser welding usually requires a certain degree of defocusing, because the power density in the center of the spot at the laser focus is too high, and it is easy to evaporate into a hole. On the planes away from the laser focus, the power density distribution is relatively uniform. There are two ways of defocusing: positive defocusing and negative defocusing. The focal plane is located on the workpiece. The above is positive defocusing, otherwise it is negative defocusing. According to the geometrical optics theory, when the positive and negative distances are equal, the power density on the corresponding plane is approximately the same, but the shape of the molten pool obtained is actually different. When the defocus is negative, a larger penetration depth can be obtained, which is related to the formation process of the molten pool. Experiments show that when the laser is heated for 50~200us, the material begins to melt, forming a liquid phase metal and vaporizing it, forming a market-pressure steam, which is ejected at a very high speed, emitting a dazzling white light. At the same time, the high concentration of vapor makes the liquid metal move to the edge of the molten pool, forming a depression in the center of the molten pool. When the defocus is negative, the internal power density of the material is higher than that of the surface, and it is easy to form stronger melting and vaporization, so that the light energy can be transmitted to the deeper part of the material. Therefore, in practical applications, when the penetration depth is required to be large, when using negative defocus to weld thin materials, positive defocus should be used. 2. Laser welding process method 1. Welding between islands Including butt welding, end welding, center penetration fusion welding, center penetration fusion welding and other 4 process methods. 2. Wire to wire welding Including wire-to-wire butt welding, cross welding, parallel lap welding, T-welding and other 4 process methods. 3. Welding of wire and block components The connection between the metal wire and the block element can be successfully realized by laser welding, and the size of the block element can be arbitrary. During welding, attention should be paid to the geometrical dimensions of the filamentary elements. 4. Welding of Tong metal Welding different types of metals addresses weldability and weldability parameter ranges. Laser welding between different materials is only possible with certain material combinations. Laser brazing The connection of some components is not suitable for laser welding, but the laser can be used as a heat source to implement soft soldering and brazing, which also has the advantages of laser welding. There are many ways to use brazing. Laser soldering is mainly used for the welding of printed circuit boards, especially for chip component assembly technology. 3. Compared with other methods, the use of laser soldering has the following advantages 1. Due to local heating, the components are not prone to thermal damage and the heat-affected zone is small, so soldering can be performed near the heat-sensitive components. 2. Using non-contact heating, melting the bandwidth, without any auxiliary tools, it can be processed after the double-sided components are equipped on the double-sided printed circuit board. 3. Good stability in repeated operation. The flux has little pollution to welding tools, and the laser irradiation time and output power are easy to control, and th
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05
2022-08

Hard fast door

Time of issue:2022-08--05
Rigid high-speed door, also known as aluminum alloy high-speed door, abbreviated as hard shutter, is a new type of metal high-speed door with anti-theft and high temperature partition, which is reliable, practical and easy to operate. technical parameter Control System The absolute servo system is adopted, the core is DSP chip, and the system sets the opening height of the door by receiving the absolute encoder signal at the tail of the motor. Control box: IP54 control box Motor system It is composed of encoder imported from Japan Nissei; power failure braking system; large inertia planetary reducer; manual release mechanism; fault manual device. The overload capacity is strong, and the switch can work more than 2000 times a day in some high-frequency occasions. High-resolution absolute encoder with 2000 lines. Use manual release mechanism. Lifting mechanism The aluminum alloy guide load-bearing track is used to ensure that the door curtain has no noise when running at high speed, and there is no friction between the door curtain and the track. door curtain mechanism The control door curtain mechanism is divided into: aluminum alloy curtain, soft connecting rubber strip, load-bearing rubber chain, guide wheel and other parts: 1. Aluminum alloy [the thickness of the curtain is 1-200mm, the surface is treated with anodizing and organic coloring, the tensile strength exceeds 230B/MPA and conforms to the standard color of GB/T5237.1-5-2000. There are also aluminum alloy sand white and China red two. optional colors; 2. After connecting the aluminum composite door curtain station through the soft connecting rubber strip, the folding life of the soft connecting part can reach more than one million times; 3. The design of the angle chain load-bearing method makes the junction of the 1 door curtain unstressed, the door curtain sheet does not change shape, and can maintain smoothness after a long time; 4. When the door is running, it slides in the aluminum alloy track through the guide wheel made of polyurethane, and there will be no friction and noise when running at high speed. security system 1. Infrared safety protection electric eyes: There are opposite radio eyes on both sides of the door frame. There is an object under the fast door, so that the door remains open. When the door body is lowered, there is an object passing below, and the door body is opened to the z-open position, and there is no obstacle below. Time delay and then drop. 2. Bottom safety protection side: When the door body is falling, because the object is in the blind area of ​​infrared safety protection, when the door body is pressed against the obstacle below, the door body quickly rebounds to open the door at z, effectively protecting the object or pedestrians below. Avoid accidents. 3. Light curtain protection system: This configuration is the most effective way of safety protection unique to industrial doors. It is installed in the direction of heavy and straight places. It is an effective measure to calculate the position of the door curtain according to the real-time height of the door curtain body and protect the passing pedestrians or objects. Power requirements. 220V/ 380V/ 13A/single phase/50HZ/ Performance characteristics Safety performance Infrared safety protection electric eye, bottom safety protection edge, and light curtain protection system are used to maintain a high level of safety performance. wind resistance 30 M/S (DIN EN 12424 wind resistance class 11) Insulation performance Insulation coefficient: K-VALUE 0.4W/M2K sealing performance. Rail seal, curtain connection seal Manual function Contains manual emergency devices type According to the on-site civil structure, it can be divided into: turbine suction type, elliptical suction type, heavy straight lifting type, 90-degree standard turning lifting type or more orbital methods. The standard is turbine suction type and elliptical suction type. use It is widely used in underground garages, automobile factories, food, chemicals, textiles, electronics, supermarkets, refrigeration, logistics, warehousing and other places, and can meet the requirements of high-performance logistics and clean places.
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