What are the welding methods commonly used in handheld laser welding machines?

Although the handheld laser welding machine is very good welding equipment, mastering certain skills can help us use the hand-held laser welding machine better. Let us explain to you what the common welding methods of hand-held laser welding machines are.

Laser welding can generally be divided into heat conduction type and deep penetration type welding, but there is also a new welding mode: the unstable phenomenon of sharp fluctuation of weld penetration under stable process conditions is called mode instability welding. After research, it is found that in the process of mode instability welding, the plasma is intermittently generated and extinguished, and the whole process is a random and random change of deep penetration welding and heat conduction welding, which can be seen from the welding seam forming. A characteristic of random changes in welding patterns. In the deep welding mode, the weld is wide and the penetration is large; when it is changed to the heat conduction type, the weld is suddenly narrowed and the penetration is suddenly reduced.

In addition, when the focus position, laser power, or welding speed in laser welding are continuously changed, three completely different welding processes, stable conduction welding, mode instability, and stable deep penetration welding, will appear in turn. Moreover, the process conditions generated by the mode unstable welding process are between the process conditions of stable conduction welding and stable deep penetration welding. The transition region of this model can be explained by the absorption of the laser light by the plasma: the critical power density for vaporization of the metal surface is very close to the critical power density for plasma generation, and the formation of pinholes is accompanied by the generation of plasma. When the laser power density is near the critical conditions for the formation of small holes, the laser energy obtained by the workpiece fluctuates due to the absorption of the laser by the plasma.

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