Publish Time: 2020-09-02 Origin: Site
The laser welding machine can not only improve work efficiency, but also make the finished workpieces look beautiful, with small weld seams, large welding depth and high welding quality. How to ensure the welding quality of laser welding machine, in fact, there are many factors that affect the quality of laser welding, let us find out the reasons.
The following knowledge points are listed below:
The energy of a laser pulse
Laser beam spot diameter
The frequency of the laser pulse
Laser pulse waveform and relative light absorption rate
Laser pulse energy: its meaning is the maximum output energy of the laser pulse. According to the laser welding machine's maintenance manual, the laser energy can meet any occasion where the demand is less than 70 Joules, but the laser welding machine cannot meet the needs of large energy sources. The increased volume of the laser power supply and the total amount of radiators will reduce the laser pulse Output efficiency.
Laser spot focusing diameter: This is a very important parameter, which reflects the design performance of the laser in (mm) units, which determines the laser power density and processing range. If the optical design of the laser welding machine is reasonably advanced, the laser energy is concentrated and the focusing is accurate, the spot diameter can be controlled in the range of 0.2-2 mm. Whether the laser focus diameter can be controlled at 0.2 mm is a strict requirement of the laser generator.
Frequency of laser pulses: This is the ability to reflect how many pulses a laser welding machine can emit in one second, in units of (hertz). The first thing to note is that the welding metal uses the energy of the laser welding machine. With the laser power unchanged, the higher the frequency, the smaller the energy output by each laser. Therefore, we need to ensure that the energy of the laser is sufficient to melt the metal. In the case of processing speed, the output frequency of the laser can be determined. For laser repaired abrasive tools, 15hz can meet the needs of welding. Excessive frequency will inevitably lead to laser pulse energy is too low, resulting in welding failure
Laser pulse waveform: For pulse laser processing, the laser pulse waveform is an important issue in pulse laser welding. When the high-intensity laser is incident on the surface of the material, the laser energy of the laser welding machine reflected by the metal surface accounts for 60% to 98% of the surface energy of the material, and the reflection coefficient changes with the surface temperature. Therefore, for different metals, the reflectivity and utilization rate of the laser are different. In order to perform effective welding, it is necessary to input lasers with different waveforms, so that the metal structure at the welding seam is crystallized to form a matrix in an optimal manner. Consistent metal structure can form high-quality welds. General household machines use cheap single-wave laser power. Therefore, the flexibility of welding is poor, it is difficult to adapt to the welding of various mold materials, and rework is often performed, which greatly wastes the time of the welding material and may cause the generation of molds. Scrapped. Different metal materials reflect and absorb lasers differently. The same laser produces different welding effects on different metals, affecting their penetration, welding speed, crystallization speed and hardness. Therefore, a single rectangular wave welding cannot solve the problem of metal welding of different molds. Claim.
So after reading this article you know the basic quality factors of the laser welding machine now? we also provide fiber laser marking machine,UV laser marking machine, contact us now!