Explain the characteristics of laser welding and how to improve the quality of welding

What are the characteristics of laser welding

Laser welding is a high-energy density laser beam as a heat source of high-efficiency precision welding method, mainly used for welding thin-walled materials and low-speed joint, the process by laser irradiation heating the surface of the workpiece, so that the surface heat through heat conduction to the internal, control the laser pulse width, energy, peak power and repetition frequency and other parameters, so that the workpiece melting, melting.

Laser welding processing has its convenience and advantages, but also has its own disadvantages in terms of environmental requirements and process characteristics of welding processing.

1. high reflectivity and high thermal conductivity materials, such as aluminum, copper and their alloys, the weldability changes with the laser.

When a fixture or fixture is required 2. the workpiece, the positioning of the welding part and the positioning of the welding point where the laser beam collides must be ensured.

The position of the 3. welding workpiece must be very accurate and must be within the focus of the laser beam.

The maximum welding thickness of the 4. shall generally not exceed 19mm.

5. in the medium and high energy laser beam welding process, it is necessary to use the plasma controller to expel the ionized gas around the molten pool to ensure the reappearance of the weld bead.

Methods to improve the quality of laser welding processing

The laser welding process is heat conduction type. The laser heats the surface of the workpiece, and the surface heat spreads to the inside through heat conduction. The parameters such as the width, energy, peak power and repetition frequency of the laser pulse are controlled, so that the workpiece melts and forms a specific molten pool. With its unique advantages, the precision welding of micro and small parts has been successfully carried out. The following describes how to improve the quality of laser welding.

1. One of the important parameters in laser welding is power. Using a high-power laser welding machine, it can quickly heat and vaporize in a short time. At the same time, the output is also related to cutting, opening, etc. The low power density can make the surface temperature at the boiling point, and then the lower layer obtains smelting, surface gasification, and achieves the purpose of welding.

2. Another parameter in the equipment process is the pulse width of the laser, which is a decisive parameter for the equipment price and the entire volume, and is also a parameter different from melting. Wuhan Ruifeng Optoelectronic Laser Equipment has high cost performance. With years of laser research and development experience, the product technology is mature, and the product performance is safe and stable. Ruifeng Optoelectronic Laser Electric always adheres to the attitude of "quality first, service second, price third, to provide customers with the highest quality products and services.

3. Find the focus position of welding. Although the welding focus has a great influence on the quality of laser welding, the size of the focus is mainly determined by the length of the focal length. Therefore, in order to improve the quality of laser welding, a short focal length can be used for welding. To obtain a higher energy density, but the light spot generated at the end focal length is smaller, under the condition that the positioning accuracy of the joint is not high, long focus welding with high energy density can also be used. 4. Laser pulse waveform is important in thin plate welding, which is also a problem worthy of attention in laser welding process. When welding is carried out by laser welding machine, 60%-98% of the energy is lost due to reflection after the laser beam shines on the surface of the material, and the surface temperature changes, therefore, the reflectivity of the metal changes when the pulse is applied.

Because there are many factors that affect the quality of laser welding processing, in the process of welding processing, if you want to improve the quality of laser welding processing, you need to pay attention to these factors that affect the quality. At the same time, find out the focus position during welding and master the welding speed to improve the quality of laser welding processing.