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Do you know the three major welding difficulties in Laser Welding?

Dec. 24, 2019

Because laser technology has the characteristics of low welding heat input, the small influence of welding heating area and difficult deformation, it has received special attention in the field of aluminum alloy welding. On the other hand, due to its own defects, there are three major welding difficulties in laser welding. So how to solve it as a Laser Welding Machine Factory?

Low laser absorption of materials

a) Adopt an appropriate surface pretreatment process. For example, sandpaper polishing, surface chemical etching, surface plating and other pre-treatment measures. Increase the material's absorption of laser light.

b) Reduce the spot size and increase the laser power density.

c) Change the welding structure so that the laser beam is reflected multiple times in the gap. Easy to weld aluminum alloy

Prone to pores and thermal cracks.

1) After several welding tests and studies, it has been found that adjusting the laser power waveform during welding can reduce the unstable collapse of pores, change the angle of laser beam irradiation, and apply a magnetic field during welding, which can reduce pores generated during welding.

2) When using a YAG laser, you can adjust the pulse waveform and control the heat input to reduce crystal cracks.

The mechanical properties of welded joints decline during the welding process

Due to the unstable porosity caused by aluminum alloy welding, the mechanical properties of the welded joint are caused. Aluminum alloy mainly includes three elements: Zn, Mg, Lv. When welding. The boiling point of aluminum is higher than that of the other two elements. Therefore, when welding aluminum-alloy elements, some low boiling alloy elements can be added, which is conducive to the formation of small holes and the firmness of welding.

The high efficiency of laser welding of aluminum alloys makes people look forward to its development prospects. Therefore, some researchers have continuously developed new technologies such as laser-arc coincidence technology and dual focus technology to improve the stability of the welding process and the quality of the weld.

Laser Welding Machine

Laser Welding Machine

Laser Welding Machine Features:

It belongs to fusion welding, which uses a laser beam as an energy source and impacts on the welding joint.

The laser beam can be guided by a planar optical element (such as a mirror), and then the beam is projected on the weld seam by a reflective focusing element or a lens.

Laser welding is non-contact welding. It does not require pressurization during the operation, but inert gas is required to prevent the oxidation of the molten pool. The filler metal is occasionally used.

Laser welding can be combined with MIG welding to form a laser MIG composite welding to achieve large penetration welding, while the heat input is greatly reduced compared to MIG welding.

Generally, in terms of judging the quality of laser welding equipment, there are many ways to judge the quality of laser welding machines. You can monitor the tensile strength and determine where the problem is with the equipment based on the results of the inspection.

If the products welded by the welding machine are continuous, the welding effect at the same location is not ideal. In the case of poor welding, at this time we can check whether the workbench and the fixture are not tightly clamped and whether the welded seam is uneven. Our company also has China Laser Cutting Machine on sale, welcome to consult.

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