Exciting? Light? Welding? Tin? ? Work? Yi? Technology? ? And? Sex? Yes? Te? Point

Ii. Laser Welding Process:
1,Welding Between slices. The process includes welding, end welding, center penetration melting welding and center perforation melting welding.
2,Welding of wire and wire. It includes four process methods: wire-to-wire welding, cross welding, parallel lap welding, and T-type welding.
3. Welding of wire and block components. Laser Welding can be used to successfully connect a wire to a block element, and the size of the block element can be arbitrary. Pay attention to the geometric size of the filament components during welding.
4. Welding of different metals. Solderability and solderable parameter range should be solved for different types of metals. Laser Welding between different materials is only possible for some specific material combination. Some components of Laser Brazing cannot be connected by laser melting welding. However, soft brazing and hard brazing can be performed by using laser as a heat source, which also has the advantages of laser melting welding. There are many kinds of brazing methods, among which, laser soft brazing is mainly used for the welding of printed circuit boards, especially for the chip component assembly technology.

Iii. Compared with other methods, laser soft brazing has the following advantages:
1. Because it isPartial heating, components are not prone to thermal damage, and the thermal effect zone is small.Therefore, soft brazing can be performed near the thermal element.
2. UseNon-contact heating, melting bandwidthWithout any auxiliary tools, you can work on Dual-sided printed circuit boards with dual-sided components.
3. Stable repeated operations. The welding tool has little pollution, the laser irradiation time and output power are easy to control, and the success rate of Laser Brazing is high.
4. laser beam is easy to achieve optical splitting. Time and Space separation can be performed by optical elements such as half lens, mirror, Prism, and scanning mirror to achieve simultaneous symmetric welding at multiple points.
5. Laser Brazing uses a laser with a wavelength of 1.06um as a heat source and can be transmitted using optical fiber. Therefore, it can be processed in a location that is difficult to be welded in conventional mode, with good flexibility.
6. High focal power, easy to automate multi-station devices.

Iv. Laser Deep welding:
1. Metallurgical Process and process theory. The metallurgical physical process of laser deep melting welding is very similar to that of electron beam welding, that is, the energy conversion mechanism is achieved through the "Small Hole" structure. Under high-power-density beam, the material evaporate to form a small hole. The steam-filled small hole is like a black body, which almost absorbs the energy of the incident light. The equilibrium temperature in the cavity is about 25000 degrees. Heat is transmitted from the outer wall of the high-temperature cavity to melt the metal surrounding the cavity. The small hole is filled with high-temperature steam produced by continuous evaporation of the Wall Body material under the beam. The four walls of the small hole are surrounded by molten metal, and the liquid metal is surrounded by solid material. The liquid flow outside the wall and the surface tension of the wall layer are in line with the continuous steam pressure generated in the cavity and maintain a dynamic balance. The beam continuously enters the small hole, and the materials outside the small hole are continuously flowing. As the beam moves, the small hole is always in a stable state of flow. That is to say, the small hole and the melt metal surrounding the hole wall move forward with the leading beam speed, the molten metal fills the gap after the small hole is removed and then condenses, and the weld is formed.
2. influencing factors. Factors Affecting Laser Deep melting include:Laser Power, laser beam diameter, material absorption rate, welding speed, protective gas, lens focal length, focus position, laser beam position, laser beam start and end points laser power increase and decrease Control.
3. Features of Laser Deep melting: (1) high depth-width ratio. Because the molten metal is formed and extended to the workpiece around the cylindrical high-temperature steam cavity, the weld is deep and narrow. (2) minimum heat input. Because the temperature of the source cavity is very high, the melting process is extremely fast, the heat of the input workpiece is extremely low, and the thermal deformation and heat affected zone are very small. (3) high density. Because the small hole filled with high-temperature steam is conducive to welding pool mixing and gas escape, resulting in the formation of non-pore penetration welding. The high cooling rate after welding is easy to make the weld microstructure micro. (4) solid weld. (5) Precise Control. (6) Non-contact and atmospheric welding process.
4. Advantages of Laser Deep melting: (1) due to the high power density of the focused laser beam compared with the conventional method, the welding speed is fast, and the thermal zone and deformation are small, it can also weld titanium, and other hard-to-weld materials. (2) because the beam is easy to transmit and control, and does not need to change the welding torch and nozzle frequently, it significantly reduces the auxiliary downtime, so the load factor and production efficiency are high. (3) due to Purification and high cooling rate, the weld is strong and the comprehensive performance is high. (4) low balance hot input and high processing precision can reduce the re-processing cost. In addition, the cost of laser welding is relatively low, which can reduce the production cost. (5) It is easy to achieve automation and can effectively control the beam intensity and precise positioning.
5. Laser Deep melting equipment: continuous wave CO2 laser is usually used for laser deep melting. This type of laser can maintain a high enough output power to produce a "small hole" effect and penetrate the entire Workpiece Section, forming a strong welding joint. As far as the laser itself is concerned, it is just a device that can generate parallel beams that can be used as heat sources and have good directionality. If it is oriented to and effectively processed and then directed to the workpiece, its input power will have strong compatibility, so that it can better adapt to the automation process. To effectively implement welding, the laser and other necessary optical, mechanical, and control components work together to form a large welding system. The system includes lasers, beam transmission components, workpiece loading and unloading and moving devices, and control devices. This system can be manually carried and fixed by the operator only, or it can include automatic loading, unloading, fixation, welding and inspection of the workpiece. The general requirement for the design and implementation of this system is to achieve satisfactory welding quality and high production efficiency.

V. Laser Welding of steel materials:
1. Laser Welding of carbon steel and common alloy steel. In general, the effect of carbon steel laser welding is good, and the welding quality depends on the impurity content. Like other welding techniques, sulfur and phosphorus are sensitive factors for welding cracks. To achieve satisfactory welding quality, preheating is required when the carbon content exceeds 0.25%. When steel with different carbon contents is welded to each other, the torch can be slightly biased towards the low carbon material side to ensure the joint quality. Low Carbon boiling steel is not suitable for Laser Welding because of its high sulfur and phosphorus content. Low Carbon Sealed Steel has good welding effect due to its low impurity content. Medium, high carbon steel and common alloy steel can be used for good laser welding, but preheating and post-weld processing are required to eliminate stress and avoid crack formation.
2. Laser Welding of stainless steel. In general, stainless steel laser welding is easier to obtain high-quality joints than conventional welding. Because the heat-affected zone of high welding speed is very small, the sensitivity is not an important issue. Compared with carbon steel, the low thermal conductivity of stainless steel makes it easier to obtain deep-fused narrow welds.
3. Laser Welding between different metals. The extremely high cooling rate and low thermal impact zone of laser welding create favorable conditions for Material compatibility with different structures after melting of many different metals. It has been proved that the following metals can be used for laser deep-fused welding: stainless steel ~ Low Carbon Steel, 416 stainless steel ~ 310 stainless steel, 347 stainless steel ~ Hastally nickel alloy, nickel electrode ~ Cold forged steel, bimetal tape with different nickel content.