How to determine whether the parameters of laser welding is

Parameters have a direct impact on the quality of laser welding include: energy of the laser pulse frequency of the laser beam spot diameter of the laser pulse, the laser pulse width, pulse waveform laser light absorption rate is relatively welding materials, welding speed, protection gases.
Laser pulse energy: refers to the maximum energy of a single laser pulse energy output, the unit is J (joule). This is one of the main parameters of the laser, which determines the maximum energy that can be generated by a laser, in accordance with mold repair purposes, the laser energy at the following 70J has been able to meet the needs of any occasion, and then much energy is wasted, or simply do not have access, but also brought increasing laser power supply volume and size of the radiator, reducing the efficiency of the power supply.
Focus the laser spot diameter: This is a very important parameter to reflect the performance of the laser design, the unit is (mm), which determines the power density and range of the laser processing. If the optical design reasonable advanced laser, the laser energy is concentrated, focused and accurate, able to control the laser spot diameter in the range of 0.2mm-2mm, and whether the focus diameter of the laser control in 0.2mm laser generator is a strict test. Domestic general design of the laser, since only want to reduce costs, therefore, the laser device processing simple, design is not rigorous, laser resonant cavity diverging severe, making it difficult to accurately focus its laser spot diameter of the laser output failed to reach the standard said 0.2mm, but only reaches a minimum of 0.5mm, and because of the divergence of the laser so that the laser beam output of the rules is not circular, which resulted in the configuration in the laser irradiation area is too large, the weld ablation phenomenon occurs, that appears across the welds unnecessary laser irradiation to make ends weld a depression, a phenomenon for repair mold polishing effects have been particularly severe, and sometimes even make mold scrapped. Poor's laser design with sophisticated, strict election materials, carefully debugging, so that the beam spot diameter of the laser output can be precisely monitored, so that the smallest focused spot size can reach 0.2mm, and can be in the range of 0.2mm and 2mm in stepless adjustment, reached the international advanced level.
Frequency of the laser pulses: This is a reflection of the laser in a second number of pulses ability can play, the unit is (Hz). First need to note is that the weld metal using laser energy, and the laser power is constant, the higher the frequency, the smaller the energy of each laser output, therefore, we need to ensure that the laser energy sufficient to melt metal under the circumstances, consider the processing speed to fix the output frequency of the laser. In the case of laser repair abrasive, 15Hz has been able to meet the needs of the welding, high frequency laser pulse energy is bound to cause too low, resulting in weld failure.
Laser pulse waveforms: For the pulsed laser welding process, the laser pulse waveform in pulse laser welding is an important issue. When the laser light incident on the surface of high-strength material to the metal surface will be 60% to 98% of the laser energy reflected away, and the reflectivity of the surface with a temperature change. Therefore, different metals for the utilization of reflectivity of the laser and the laser are not the same, to be effective you must enter the laser welding of different waveforms, such weld metal structure can be crystallized in the best way, and the substrate is formed consistent metal tissue in order to form a high quality weld. Domestic machines are generally inexpensive single waveform of laser power, therefore, the welding of the less flexible, difficult to adapt to a variety of welding mold material, and often have to be reworked, greatly wasting the time of welding materials, and may cause mold scrapped. On the surface of a metal material different laser reflection and extent of absorption varies greatly, and a laser beam with different metals produce different welding results, and affect their penetration and welding speed, the crystallization speed and hardness, thus a single rectangular wave welding does not solve different mold metal welding. Smart TPM with Pu mold repair laser welding waveform using domestic unique intelligent technology to achieve highly flexible laser welding system, according to different applications and adjust the waveform, so that the weld metal and base metal consistent organization, or die after welding metal parts, weld hardness HRC50-HRC58, really achieve non-destructive welding, greatly improving the quality of welding.