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Determine the parameters of the laser welder-superwave laser

Superwave Laser Technology Co.,Ltd | Updated: Dec 20, 2017


Will parameters that affect the quality of laser welding are: laser pulse energy, laser beam spot diameter, the frequency of the laser pulse laser, laser pulse width, pulse waveform, relatively light absorption by welding materials, welding speed, shielding gas, etc.  

 

The energy of a laser pulse: the maximum output of a single laser pulse. The unit is J (joule). This is one of the main parameters of laser, it determines the energy of the laser will have how much, according to the purpose of the mold repair, laser energy under 70 j has been to the needs of the full foot any occasion, the energy again big also is useless, and bring the laser power supply volume and radiator volume increasing, reduce the efficiency of the power supply.

 

Laser spot focusing diameter: this is a very important parameter that reflects the design performance of the laser, the unit is (mm), which determines the power density of the excited light and its machining range. If laser can reasonable design of advanced optical, laser energy focus, focus accurately, can control the excitation light spot diameter in the range of 0.2 mm - 2 mm, and can control the laser focus diameter of 0.2 mm is a strict test of laser generator. Domestic general design of the laser, because want to reduce the cost, therefore, the laser device processing crude, design is not rigorous, excitation light divergence in the resonator is serious, lead to accurate focusing, the laser output of laser speckle never even nominal diameter 0.2 mm, with minimal only 0.5 mm, due to the divergence of the laser, the output of a laser beam can't rule in the circular, 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. With the company's laser design is excellent, selected material strictly, fine-tuning, the laser output beam spot diameter can monitor precision, minimize the size of the focal sp can reach 0.2 mm, and can be in the range of 0.2 mm and 2 mm for stepless adjustment, reached the international advanced level.

  

Frequency of laser pulses: this is the ability to reflect how many pulses a laser can produce in a second, in units (Hz). First you need to say Ming, weld metal is the use of laser energy, and under the condition of the laser power constant, the higher the frequency, each laser output energy is smaller, therefore, we need to ensure that the laser energy enough to molten metal, consider the speed of processing, to determine the output frequency of the laser. In the case of laser repair and grinding tools, 15Hz has already been able to meet the welding requirements, and the high frequency is bound to cause the pulse energy of the laser to be too low, thus causing the welding failure.   


Pulse waveform of laser: laser pulse waveform is an important problem in pulse laser welding. When the high intensity of the laser enters the surface of the material, the metal surface will reflect off 60 to 98 percent of the laser energy, and the reflectivity varies with the surface temperature. Thus, different metal for the utilization of the reflectivity of laser and laser are all different, must carry on the effective different waveform of the laser welding must be input, in this way can seam metal organization in the best way of crystallization, form consistent with the substrate metal organization, only can form high quality welds.


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