Views: 13 Author: DURMAPRESS Publish Time: 2021-11-05 Origin: DURMAPRESS
Quality parameters affecting the diaphragm laser beam welding machine include:
1. The energy of the laser pulse
Laser pulse energy: refers to the energy output by a single laser pulse, the unit is J (joule). This is one of the main parameters of laser, it determines the lasers can generate energy of * *, according to the purpose of the mold repair, laser energy under 70 j can already satisfy the need of any occasion, more energy is wasted, or not to use, and bring the laser power supply volume and radiator volume increasing, reduce the efficiency of the power supply.
2. Diameter of laser beam spot laser beam welding machine
Laser spot focusing diameter: this is a very important parameter reflecting the design performance of the laser, the unit is (mm), it determines the laser power density and processing range. If the optical design of the laser is reasonable and advanced, laser energy concentration, focusing accuracy, can control the laser spot diameter in the range of 0.2mm-2mm, and whether the laser focusing diameter is controlled in 0.2mm is a strict test of the laser generator. Domestic general design of the laser, because want to reduce the cost, therefore, the laser device processing crude, design is not rigorous, laser divergence in the resonator is serious, lead to accurate focusing, the laser output of laser speckle never even nominal diameter 0.2 mm, but only small * 0.5 mm, due to the divergence of the laser, Output of a laser beam can't rules in circle, which creates a practical laser irradiation area is too big, appear ablation phenomenon of welds, which appears in the weld the ends of the laser and unnecessary to render sag on both ends of the weld, this phenomenon for repair has been polished mold especially hard, sometimes even make mold scrapped. Tongpu company's laser design is excellent, strict material selection, careful debugging, so that the laser output beam spot diameter can be monitored precisely, so that the size of the focus spot can reach 0.2mm, and can be in the range of 0.2mm stepless adjustment, to reach the international advanced level.
3. Frequency of laser pulse
Laser pulse frequency: This is the ability of the laser to generate pulses in a second, in (Hz). First of all, it should be noted that welding metal is the energy of laser, and in the case of constant laser power, the higher the frequency, the smaller the energy output of each laser. Therefore, we need to ensure that the laser energy is enough to melt metal, considering the speed of processing, in order to determine the laser output frequency. In the case of laser repairing abrasives, 15Hz has been able to meet the needs of welding, too high frequency is bound to cause the laser pulse energy is too low, resulting in welding failure.
4. The laser pulse waveform and the relative optical absorption rate of the welding material
Laser pulse waveform: for the use of pulse laser welding processing, laser pulse waveform in pulse laser welding is an important problem. When a high intensity laser incident on the surface of the material, the metal surface will reflect 60% to 98% of the laser energy, and the reflectivity varies with the surface temperature. Therefore, different metals for laser reflectivity and laser utilization rate are not the same, to carry out effective welding on the input of different waveforms of laser, so that the metal structure at the weld can be crystallized in the perfect way, the formation of the structure consistent with the matrix metal, in order to form a high quality weld. Domestic general machines are using cheap single waveform laser power supply, therefore, its welding flexibility is low, it is difficult to adapt to the welding of a variety of mold materials, and often have to rework, greatly wasting the time of welding materials, and may cause the scrap of the mold. Different metal material surface of laser reflection and absorption degree is very different, and the same laser to different metal will produce different welding effect, and affect its depth, welding speed, crystallization speed and hardness, so a single rectangular wave welding can not solve the requirements of different mold metal welding.
5. Control characteristics: feedback control method, power waveform selection
In the choice of laser power waveform, generally speaking, in the input of the same laser energy, the wider the pulse width, the larger the welding spot; The higher the peak power of laser power waveform is, the deeper the weld spot is.