Laser Welding Machine Parameters

- Aug 08, 2017 -

Power density

Power density is one of the most critical parameters in laser processing. Using a higher power density, in the microsecond time range, the surface can be heated to the boiling point, resulting in a large number of vaporization. Therefore, the high power density for material removal processing, such as drilling, cutting, carving favorable. For the lower power density, the surface temperature reaches the boiling point of the need to go through several milliseconds, before the surface vaporization, the bottom reaches the melting point, easy to form a good melt welding. Therefore, in the conductive laser welding, the power density in the range of 104 ~ 106W / cm2.

Pulse waveform

Pulse waveforms are an important issue in welding, especially for sheet welding. When the high intensity beam to the surface of the material, the metal surface will have some energy reflection and loss, and the reflectivity changes with the surface temperature. During a pulse period, the metal reflectivity changes greatly.


Pulse Width

Pulse width is one of the important parameters of pulse welding, it is different from the material removal and material melting of the important parameters, but also determine the cost of processing equipment and volume of the key parameters.

The effect of defocusing

Because the laser focus at the center of the power density is too high, easy to evaporate into the hole. Leaving the laser focus on the plane, the power density distribution is relatively uniform. There are two ways to defocus: positive and negative defocus. The focal plane is located at the top of the workpiece for positive defocus and vice versa. According to geometrical optics theory, when the positive and negative defocus plane and welding plane distance is equal, the corresponding plane on the power density is similar to the same, but in fact the shape of the molten pool is different. Negative defocus, you can get a greater penetration, which is related to the formation of the pool.

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