What are the parameters that affect the quality of handheld laser welding machines?

April 10, 2024

Parameters that directly affect the quality of handheld laser welding machines include laser pulse energy, laser beam spot diameter, laser pulse width, excitation laser pulse frequency, light pulse waveform, relative absorption coefficient of welding materials, welding speed, protective gas, etc.
Laser spot focus diameter

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The spot size of this laser (mm), design. Yes, it is important to design a laser with an accurate and reasonable unit focus range. Parameter 0 determines the welding concentration and processing. If the laser energy power density is very advanced in controlling the laser diameter, the laser performance density reflects the optics of the individual laser machine. 0.2mm occurs The test 2mm-2mm strictly controls the laser diameter and whether it can focus. It is simple to reduce the cost of strictly designing the laser to process the laser. Therefore, it is not an idea to design domestic devices. It is difficult to focus and diverge in the resonant cavity, and the precision of the laser is serious. It is unnecessary to corrode and repair the area so that the dents appear due to the irradiation. The polishing of the mold welds at both ends seriously causes the welding seams. Sometimes, the phenomenon of mold laser burning is actually large, especially at both ends of the laser. to scrap

Laser welding machine laser pulse frequency

This is the ability, measured in Hertz, of how many pulses a reflected laser can hit in one second. First of all, it needs to be explained that welding metal uses the energy of a laser. When the laser power is constant, the higher the frequency, the smaller the energy output of each laser. Therefore, we need to ensure that the energy of the laser is enough to melt the metal and consider the processing speed to determine the output frequency of the laser. In the case of laser grinding tools, 15Hz can already meet the needs of welding. Too high a frequency will inevitably lead to too low laser pulse energy, leading to welding failure.

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Handheld laser pulse energy

Refers to the energy output of a single laser pulse in J (joules). This is a main parameter of the laser, which determines the energy generated by the laser welder. Depending on the purpose of mold repair, no matter how much energy is wasted or cannot be used, laser energy below 70J can meet the needs of any occasion, resulting in an increase in the volume of the laser power supply and radiator, thereby reducing power efficiency.

Laser pulse waveform

For laser welding machines that use pulse laser for welding processing, the laser pulse waveform is an important issue in pulse laser welding. When a high-intensity laser is incident on the surface of a material, the metal surface will reflect 60% to 98% of the laser energy, and the reflectivity changes with the surface temperature. Therefore, different metals have different reflectivities and utilization rates of lasers. To perform effective welding, lasers with different waveforms must be input, so that the metal structure at the weld can crystallize in a certain way and form a structure consistent with the base metal. Only the best organization can form high-quality welds. General domestic machines use cheap single-waveform laser power supplies. Therefore, their welding flexibility is low and difficult to adapt to the welding of multiple mold materials. They often require rework, which greatly wastes time in welding materials and may cause damage to the mold. scrapped. Different metal materials have very different degrees of laser reflection and absorption on their surfaces, and the same laser beam will produce different welding effects on different metals and affect their penetration depth, laser welding machine welding speed, crystallization speed and hardness, so a single laser The rectangular wave welding cannot solve the requirements of different mold metal welding.