Is the higher the power of the plastic laser welding machine, the better?

Many people think that for Plastic laser welding machine, the greater the power and the faster the welding speed is, the better, but this is not the case, because the power and welding speed of the plastic laser welding machine will have a direct impact on the welding depth and width, thereby affecting the welding quality. Therefore, the speed and power of plastic laser welding machines of different materials should be determined according to the specific products, which is better for the products. Today we will learn about the impact of the speed and power of plastic laser welding machines on welding quality.

When the plastic laser welding machine is performing welding work, the main role is the laser power density value. Different materials have a critical power density threshold. In order to weld, the power must exceed this critical threshold to melt the material and achieve the welding effect. When the laser power is constant, the welding speed becomes the main factor affecting the welding strength, and the appropriate laser welding speed is the guarantee of welding firmness.

For high-power laser welding machines, it is easy to burn the alloy elements in the weld area, reduce the strength and mechanical properties of the weld, and at the same time, due to the high-power welding machine, the weld formation becomes worse, increasing the number of welds. Surface holes. Too fast welding speed will reduce the strength of the weld due to the increase of pores in the weld and the reduction of effective bearing area.

Welding speed affects the welding depth together with laser power. At a certain speed, there is a critical zone for weld strength. When the power is below its lower limit, the intensity increases with the increase of power, because with the increase of power, the penetration increases and the bonding strength also increases;

When the power is greater than the upper limit of the critical zone, the intensity decreases with the increase of power.

The working principle of Laisai plastic laser welding machine is to heat the surface of the workpiece through laser radiation, and the surface heat diffuses to the inside through heat conduction. By controlling the parameters such as the width, energy, peak power and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool. But sometimes the light energy is not completely converted into metal melting, but manifested in other forms, such as vaporization, plasma formation, etc.

Therefore, whether the light energy conversion rate can be controlled has become the key to the technology, rather than blindly increasing the power of the fiber optic plastic laser welding machine to make up for this deficiency.

Laisai plastic laser welding machineWhen the welding speed is constant, the laser power should also be kept constant. However, the laser power can also be increased to speed up the welding speed, which can improve efficiency and ensure that the weld is just melted through.