Analysis of the relationship between the power of the fiber laser welding machine and various parameters:

There are many parameters of the fiber laser welding machine. Setting different parameters can achieve different welding requirements. Of course, the power of the laser welding machine is closely related to the parameters.

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

Pulse frequency: the number of times the laser pulse is repeated per second.

Pulse waveform: Pulse waveform is an important issue in welding, especially for thin sheet welding. When a high-intensity beam is irradiated to the surface of the material, the metal surface will reflect and lose some energy, and the reflectivity changes with the surface temperature. During the action of a pulse, the reflectivity of the metal changes greatly.

Laser pulse energy: refers to the energy output by a single pulse. It is determined by the capacity of the energy storage capacitor, voltage and xenon lamp. This is an important indicator. When spot welding, the stability of single-point energy has a great influence on the quality of laser welding.

Laser welding power density: It is one of the most critical parameters in laser processing. With a higher power density, the surface can be heated to boiling point within a microsecond time range, producing a large amount of vaporization. Therefore, high power density is beneficial for material removal processing, such as drilling, 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 molten weld. Therefore, in conduction laser welding, the power density ranges from 104 to 106 W/cm2.

Laser peak power: The instantaneous power of the laser when it actually emits light. The laser peak power is equal to the average power divided by the duty cycle. It is generally on the order of several kilowatts. Laser average power: The actual output laser power is approximately equal to 2-3% of the injected average electrical power.