With the further improvement of product processing technology requirements in various industries, the application of fiber laser welding machine in various fields has become more popular. Especially in the fields of manufacturing, automotive industry, electronics industry, biomedicine, powder metallurgy, etc., traditional manufacturing methods can no longer meet the needs, and laser welding technology has replaced them.

The market demand for fiber laser welding equipment is getting higher and higher, and there are many performance parameters that affect the quality of fiber laser welding machines. So, what should manufacturers pay attention to when purchasing laser welding equipment?

1. Energy of laser pulse

The energy of laser pulse refers to the maximum output energy of a single laser pulse, and the unit is J (joule). Under the condition of constant power, the higher the energy of a single laser pulse, the lower the emission frequency. The energy of laser pulse is a main parameter of the laser, which determines the maximum energy that the laser can generate.

2. Laser spot focusing diameter

The laser spot focusing diameter is an extremely important parameter reflecting the design performance of the laser, and the unit is mm (millimeter). It determines the power density and processing range of the laser. If the optical design of the laser is reasonable and advanced, the laser energy is concentrated, and the focus is accurate, the laser spot diameter can be controlled within the range of 0.2mm-1.5mm. Whether the laser focus diameter can be controlled within 0.2mm is a strict test for the laser generator.

Generally, the laser equipment of small manufacturers only wants to reduce costs, the laser device processing is simple, and the design is not rigorous, which makes it difficult to focus accurately. The laser spot diameter of its laser welding machine does not reach the standard 0.2mm at all. This causes the actual laser irradiation area to be too large, and the phenomenon of ablation weld occurs. This phenomenon has a particularly serious impact on the processed materials and sometimes even causes the mold to be scrapped. The laser welding equipment produced by Wuhan Huagong Laser Engineering Co., Ltd. can achieve a minimum laser spot of 0.2mm and can be adjusted steplessly within the range of 0.2mm and 1.5mm, reaching the international advanced level. Huagong Laser's small and medium power laser welding equipment mainly includes: continuous fiber laser welding machine, fiber conduction laser welding machine, laser spot welding machine, etc.

3. Frequency of laser pulses

The frequency of laser pulses reflects the ability of the laser to produce how many pulses in one second, and the unit is Hz (Hertz). Taking metal welding as an example, welding metal uses the energy of laser, and when the laser power is constant, the higher the frequency, the smaller the energy output of each laser. Therefore, we need to consider the processing speed while ensuring that the laser energy is sufficient to melt the metal to determine the output frequency of the laser. Taking the fiber-optic transmission laser welding machine produced by HGLASER as an example, its laser pulse frequency is 1--100Hz and can be adjusted in stages, which can fully meet the precision welding processing of different materials and molds of different shapes. Its welding points are smooth and beautiful, the welds are flat and free of pores, and the strength and toughness of the welds are at least equivalent to or even exceed those of the parent metal.

4. Feedback control method and power waveform selection

When selecting the laser power waveform, generally speaking, under the condition of inputting the same laser energy, the wider the pulse width, the larger the weld spot; the higher the peak power of the laser power waveform, the deeper the weld spot.