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Laser welding quality influencing factors
Updatetime: 2022-05-09 11:10 View:

Laser welding machine is a new type of welding method, which can weld thin-walled materials and precision parts. The laser welding process uses high-energy laser pulses to locally heat the material in a small area, and the energy of the laser radiation diffuses into the interior of the material through thermal conduction, thereby melting the material into a specific molten pool.

Laser welding machine is also known as fiber laser welder, pulse laser welder. Although it is simple to operate, there are still some factors that can affect the quality of laser welding. How to control these factors within a suitable range in the high-speed continuous laser welding process, so as to ensure the welding quality. This article provides some references for you.
Laser welding machine
 

Quality of laser welding equipment

Beam mode, output power and its stability are important manifestations of the quality of laser welding equipment. Beam mode is an important indicator of beam quality. The lower the beam mode order, the better the beam focusing performance. The smaller the spot, the greater the power density and the greater the weld depth and width under the same laser power.
In the optical system, the focusing lens is an important factor affecting the welding quality. Focal lengths are typically between 127mm (5 inches) and 200mm (7.9 inches). A smaller focal length is beneficial to reduce the diameter of the focused beam waist spot, but too small a focal length can easily cause welding contamination and spatter.
 

Metal workpiece condition

Laser welding is to process the edge of the workpiece, and the gap between the workpieces should not be too large. Generally, the deviation between the assembly gap of the plate butt and the point butt joint should not be greater than 0.1 mm, and the misalignment should not be greater than 0.2 mm. In actual production, laser welding technology cannot meet these requirements. In order to obtain a good welding effect, the allowable amount of butt gap and lap gap should be controlled within 10% of the thickness of the sheet.
Successful laser welding results require close contact between the workpieces being welded, which requires careful and tight fixing of the material for good welding results.
Laser welding metal
 

Laser welding parameters

When the welding speed is too high, a stable deep penetration welding process cannot be maintained due to the small heat input. In actual welding, stable deep penetration welding or stable heat conduction welding should be selected according to the penetration requirements of the welding workpiece, and unstable mode welding should be avoided.
Within the stable range of deep penetration welding, the higher the laser power, the greater the penetration depth; the higher the welding speed, the shallower the penetration depth.
The shielding gas commonly used in laser welding machines is argon or helium. If the welding quality requirements are not high, nitrogen can also be used. Under the same conditions, helium has a lower tendency to generate plasma than argon, so greater penetration can be obtained. Within a certain range, with the increase of the protective gas flow rate, the plasma suppression trend increases, so the penetration increases, but it tends to be stable after increasing to a certain range.
 
In the continuous development of laser technology, the application of laser welding machines meets the production needs of different fields. In the process of laser welding, in order to obtain a successful welding workpiece, on the one hand, it is necessary to purchase high-quality, high-stability laser welding equipment, and it should be maintained regularly to keep the equipment clean. On the other hand, it is necessary to set the correct welding parameters according to the type of workpiece in order to obtain a good welding effect.
 
As a professional laser welding machine supplier, ACCTEK can provide you with quality-assured welding equipment and free technical support. To learn more about laser welding effects, you can get welding videos online.

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