Factors related to welding quality
In recent years, laser welding machines have become a popular product. Laser welding machines began to appear in various industries, such as manufacturing, powder metallurgy, automotive industry, electronics industry, biomedicine and other industries.
The popularity of laser welding equipment is an inevitable trend. Compared with traditional welding, laser welding has the advantages of small heat input and thermal influence, large aspect ratio, and automation of the welding process. Compared with argon tungsten arc welding or molten electrode argon arc welding, laser welding has narrow weld seam, small heat affected zone, reduced lap joints, precise and controllable welding process, and can be automated. At present, laser welding is mainly used for thin-walled electronic components, structural parts, aerospace parts, etc. And starting from the prospect of welding technology, it is the future development trend to study 10,000-watt fiber lasers for deep penetration welding of large and thick plates.
The efficacy of any product is not 100% certain. Some customers report that the quality of the laser welding machine is very good and even perfect. However, some customers have the opposite idea about welding quality. So what affects the welding quality of the laser welding machine? The following are the most important factors that affect the welding quality of laser welding machines.
1. The waveform of the laser pulse
According to customer feedback and market research, one of the most important factors affecting the welding quality of laser welding machines is the laser pulse waveform. When the pulsed laser is selected for welding, the laser pulse shape is an important issue in pulsed laser welding. When the high-intensity laser is incident on the data surface, the metal surface will reflect 60%~98% of the laser energy, and the reflectivity will change with the surface temperature.
It can be seen that the laser reflectivity and laser utilization rate of different metals are different. For effective and efficient welding, lasers of different waveforms must be input to crystallize the metal arrangement in the weld in the best way, form a co-alignment with the base metal, and form a high-quality weld.
2. The diameter of the laser spot gathering
The laser spot gathering diameter is an extremely important parameter that reflects the planning function of the laser. Its unit is (mm). In addition to this, it also determines the power density and processing scale of the laser.
If the optical planning of the laser is reasonable and advanced, the laser energy will be collected and concentrated accurately, and the diameter of the laser spot can be controlled in the range of 0.2-2mm. Actually. Whether the diameter of the laser focus can be controlled within 0.2mm is a severe test for the laser generator.
3. The frequency of laser pulses
The frequency of the laser pulses reflects the ability of the laser to emit how many pulses in one second. Its unit is Hertz (Hz). The first thing to note is that the welding metal uses the energy of the laser. Generally speaking, under the condition of constant laser power, the higher the frequency, the smaller the energy output per laser.
Therefore, we need to consider the processing speed and determine the output frequency of the laser under the condition that the laser energy is sufficient to melt the metal. In the case of laser sharpening tools, 15Hz is now sufficient for welding. Therefore, we generally do not recommend customers to use too high laser output frequency. Too high frequency will inevitably lead to too low laser pulse energy, which will constitute welding failure. Welding quality also naturally degrades.
4. The energy of the laser pulse
The energy of a laser pulse refers to the maximum output energy of a single laser pulse. Its unit is Joule (J). This is one of the main parameters of the laser. The most important thing is that it determines the maximum energy that the laser can produce.
Depending on the use of mold correction, laser energy below 70J can now meet the needs of any occasion. No energy is required, or it cannot be used at all. In addition, the size of the laser power supply and the size of the radiator continue to increase, reducing the power used by the power supply.
All in all, the above four factors are important factors affecting the welding quality of laser welding machine. When customers consciously pay attention to these four factors during use, the welding quality or effect will inevitably improve.