6 Things You Didn't Know About Basic Guide of Laser Welding
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6 Things You Didn't Know About Basic Guide of Laser Welding

Views: 76     Author: Site Editor     Publish Time: 2023-09-04      Origin: Site


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1. Laser Welding Machine

A laser welding machine, also often called a laser welding machine or a laser welding machine is a machine used for laser material processing.

laser welding machine

2. Working Principle

Laser welding uses high-energy laser pulses to locally heat the material in a small area. The energy of the laser radiation diffuses into the material through heat conduction, and the material is melted to form a specific molten pool. It is a new type of welding method, mainly for the welding of thin-walled materials and precision parts. It can realize spot welding, butt welding, stitch welding, sealed welding, etc., with a high aspect ratio, small weld width, and small heat-affected zone. Small deformation, fast welding speed, smooth and beautiful welding seam, no need to handle or simple processing after welding, high welding seam quality, no air holes, precise control, small focus spot, high positioning accuracy, easy to realize automation.

3. Main Species

The laser welding machine is also often called laser welding machine, energy negative feedback laser welding machine, laser welding machine, laser welding machine, laser cold welding machine, laser argon welding machine, laser welding equipment, etc. According to its working methods, it can often be divided into laser mold welding machine, automatic laser welding machine, jewelry laser welding machine, laser spot welding machine, optical fiber transmission laser welding machine, galvanometer welding machine, handheld welding machine, etc., special laser welding equipment There are sensor welders, silicon steel sheet laser welding equipment, keyboard laser welding equipment.

Weldable graphics are point, line, circle, square, or any plane graphics drawn by AUTOCAD software.

laser welding machine

4. Laser Welding Machine Parameters

● Power Density

Power density is one of the most critical parameters in laser processing. With a higher power density, the surface layer can be heated to the boiling point within a microsecond time range, resulting in a large amount of vaporization. Therefore, high power density is beneficial for material removal processing, 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 layer vaporizes, the bottom layer reaches the melting point, which is easy to form a good fusion weld. Therefore, in conductive laser welding, the power density is in the range of 104~106W/cm2.

● Pulse Shape

The pulse waveform is an important issue in welding, especially for sheet welding. When the high-intensity beam hits the surface of the material, some energy on the metal surface will be reflected and lost, and the reflectivity changes with the surface temperature. During a pulse action period, the reflectivity of the metal changes greatly.

● Pulse Width

Pulse width is one of the important parameters of pulse welding. It is not only an important parameter different from material removal and material melting but also a key parameter that determines the cost and volume of processing equipment.

● The Effect of Defocus

Because the power density in the center of the spot at the laser focal point is too high, it is easy to evaporate into a hole. On each plane away from the laser focus, the power density distribution is relatively uniform. There are two defocusing methods: positive defocus and negative defocus. If the focal plane is above the workpiece, it is a positive defocus, otherwise, it is a negative defocus. According to geometric optics theory, when the distance between the positive and negative defocus plane and the welding plane is equal, the power density on the corresponding plane is approximately the same, but in fact, the shape of the molten pool obtained is different. When the defocus is negative, a greater penetration depth can be obtained, which is related to the formation process of the molten pool.

5. Scope of Application

● Manufacturing

Laser tailor-welding technology is widely used in foreign car manufacturing. According to statistics, in 2000, there were more than 100 laser tailor-welding production lines for cutting blanks worldwide, with an annual output of 70 million tailor-welded blanks for car components, and it continued to grow at a relatively high rate. Domestically produced and imported models also use some cut blank structures.

● Powder Metallurgy

Because powder metallurgy materials have special properties and manufacturing advantages, they are replacing traditional smelting materials in certain fields such as automobiles, airplanes, and tool and cutting tool manufacturing. With the increasing development of powder metallurgy materials, there are problems with the connection between them and other parts. It appears to be increasingly prominent, restricting the application of powder metallurgy materials.

laser welding machine

● Auto Industry

According to the characteristics of large batches and a high degree of automation in the automobile industry, laser welding equipment is developing in the direction of high-power and multi-channel.

● Electronics Industry

Laser welding has been widely used in the electronics industry, especially in the microelectronics industry. The thickness of the elastic thin-walled corrugated sheet in the sensor or thermostat is 0.05-0.1mm, which is difficult to solve by traditional welding methods. TIG welding is easy to weld through, the plasma stability is poor, and there are many influencing factors. The laser welding effect is very good, and it is widely used. Applications.

● Biomedical Science

The laser welding of biological tissues began in the 1970s. The successful welding of fallopian tubes and blood vessels with laser welding and the demonstrated advantages have led more researchers to try to weld various biological tissues and promoted to welding of other tissues. The research on laser welding nerves at home and abroad mainly focuses on the laser wavelength, dose, and its function recovery, and the selection of laser solder. Based on basic research on laser welding of small blood vessels and skin, The common bile duct of the rat was welded. Compared with traditional suture methods, laser welding has the advantages of fast anastomosis, no foreign body reaction during the healing process, maintaining the mechanical properties of the welded part, and the growth of the repaired tissue according to its original biomechanical properties. It will be used in future biomedicine. Get a wider range of applications.

laser welding machine

6. Main Feature

The laser welding machine is highly automated and the welding process is simple. The non-contact operation method can meet the requirements of cleanliness and environmental protection. Using a laser welding machine to process the workpiece can improve work efficiency. The finished workpiece has a beautiful appearance, small weld seam, large welding depth, and high welding quality. Laser welding machines are widely used in the processing of dental dentures, keyboard welding, silicon steel sheet welding, sensor welding, battery sealing cover welding, and so on. However, the cost of the laser welding machine is relatively high, and the accuracy requirements for the assembly of the workpiece are also relatively high, and there are still limitations in these aspects.

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