For battery laser welding machine (YAG pulsed laser welding machine), the adjustment of current, pulse width and frequency is as follows:

If the current increases, the pulse width and frequency remain unchanged, the single point energy will increase, and the total laser output power will also increase. If the current and frequency remain unchanged, the pulse width will increase, the single point energy will also increase, and the total laser output power will also increase.

Defocusing welding can produce large laser spots; High welding quality in pulse or continuous mode; Good power supply stability during welding; High reflectivity materials can be welded.

Extended data:

Power density is one of the most critical parameters in laser processing. At high power density, the surface layer can be heated to boiling point within microsecond time range, resulting in a large amount of vaporization.

Therefore, high power density is beneficial to material removal processing, such as punching, cutting and engraving. For low power density, it takes several milliseconds for the surface layer to reach the boiling point, and before the surface layer is vaporized, the bottom layer reaches the melting point, which is easy to form a good welding. Therefore, in conductive laser welding, the power density is in the range of 104~ 106W/cm2.

Pulse waveform is an important problem in welding, especially in thin plate welding. When a high-intensity beam hits the surface of a material, the energy on the metal surface will be lost by reflection, and the reflectivity will change with the surface temperature. During the pulse, the reflectivity of the metal changes greatly.

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