What characteristics of laser are used in laser welding

【Summary Description】 Principle of laser welding What characteristics of laser are used in laser welding Steam, under the reaction force generated when the steam exits the surface, causes the molten metal liquid to crowd out to the surroundings to form pits. As the laser continues to irradiate, the pits penetrate deeper. When the laser stops irradiating, the melt around the pits returns, and the two weldments are cooled and solidified. Welding in-up. These two welding mechanism according to the actual material properties and welding needs to choose, by adjusting the laser welding process parameters to obtain different welding mechanism. The most basic difference between the two methods is that the surface of the former molten pool remains closed, while the latter The molten pool is then penetrated by the laser beam into a hole. Conduction welding has less disturbance to the system, because the radiation of the laser beam does not penetrate the material to be welded, so the weld is not easy to be invaded by gas during conduction welding. However, during deep penetration welding, the continuous closure of small holes can lead to pores. Conduction welding and The deep penetration welding mode can also be converted into each other in the same welding process, and the transition from conduction mode to keyhole mode depends on the peak laser energy density and laser pulse duration applied to the workpiece. The time dependence of laser? ‰ impulse energy density enables laser welding in During the interaction between the laser and the material, it changes from one welding method to another, that is, in the process of interaction, the weld can be formed under the conduction mode first, and then changed into the small hole mode. Schematic diagram of laser welding Laser welding is the use of high-energy laser pulses to heat the material locally in a small area, and the energy of the laser radiation is diffused to the inside of the material through heat conduction, and the material is melted to form a specific molten pool. What is the principle of laser welding technology? Laser welding technology mainly uses a parabolic mirror or a convex lens to collect the surrounding heat. At this time, the laser is a high-temperature heat source, which is applied to the surface of the workpiece joint and can play a role in welding. According to the different workpieces, the way of laser welding is also different. The commonly used laser welding methods are conduction welding and small hole welding. In the aerospace industry, laser welding technology is often used to repair workpieces; in the field of automobile manufacturing, laser welding technology is widely used in the manufacture of radiators, transmission shafts and other parts. With the continuous development of laser processing technology, the application field of laser welding technology will inevitably expand. 2.3 Friction Stir Welding Technology Friction stir welding technology, as the name implies, is to use the heat generated by friction to weld, which determines its scope of use, that is, low melting point metal welding. This welding technology has a higher level of automation, better joint quality and stability, and energy saving and low carbon. In the process of friction stir welding, a stirring needle will be inserted into the weld, and the metal will be heated by friction to make it present a plastic state. At the same time, the metal will form a rotating cavity. As the stirring needle moves forward, the cavity and plastic will rotate. The 62-shaped metal moves in opposite directions. After the metal cools, the welding gap density will be higher. Stir welding technology is mainly used in shipbuilding, aerospace, construction, transportation and other fields. In the shipbuilding industry, it is mainly used to weld components on the deck and on the bow; in the aerospace industry, it is used in the fuselage and fuel tanks of airplanes; and in the field of transportation, the bodies and exchangers of trains, high-speed trains, etc. Friction stir welding dry season technology is used. 2.4 electroslag welding technology Electroslag welding technology is a kind of welding technology using resistance heat. It can weld steel, iron-based metal and other thick workpieces at one time, and the production cost is low and the welding quality is high. The principle of electroslag welding technology is based on the principle that the electric heating group is used as a heat source to melt metal and wood, and then cooled and solidified to connect the metal atoms to each other. Commonly used electroslag welding technology mainly includes melting nozzle, non-melting nozzle electroslag welding technology, wire electrode electroslag welding technology, plate-level electroslag welding technology, etc. Electroslag welding technology is mainly used in some special places or industries, such as the welding of railway stations; welding of thick-walled containers such as blast furnace shells and so on. 2.5 plasma arc welding technology Plasma arc welding technology is a new welding technology based on plasma arc cutting industry. It is a more sophisticated welding technology. Plasma arc welding technology should be accurately said to be "compression arc welding", it is the welding torch to maximize the compression of the entire arc, to promote the plasma effect is intensified, after the arc becomes a stable, unidirectional powerful jet heat source, the temperature is as high as ~, and then can be directly welded metal. Usually, the plasma arc commonly used by enterprises is mainly transferred and non-transferred.

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