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What are the main parameters that affect the quality of laser welding
What are the main parameters that affect the quality of laser welding?
As the current increases, the width of the weld increases, and during the welding process, spatter begins to occur, the surface of the weld shows oxidation and becomes rough.
2. As the pulse width increases, the width of the weld also increases. The change in pulse width has a very significant impact on the welding effect of the laser welding machine for ultra-thin stainless steel plates. Even a slight increase in pulse width can cause the sample to oxidize and be burned through.
3. As the pulse frequency increases, the overlap rate of the solder joints increases, and the width of the weld first increases, then remains basically unchanged. Under a microscope, the weld becomes increasingly smooth and aesthetically pleasing. However, when the pulse frequency reaches a certain value, the welding process becomes severely splashed, the weld becomes rough, and oxidation occurs on both the upper and lower surfaces of the welded piece.
4. For laser welding of ultra-thin sheet materials, positive defocusing is preferable. Under the same defocusing amount, the weld surface obtained by positive defocusing laser welding is smoother and more aesthetically pleasing than that obtained by negative defocusing.
Extended Information:
During the welding process of 304 stainless steel, there will be a problem of hot cracks in the welded joint. The reasons are as follows:
The expansion coefficient of austenitic stainless steel is much higher, but its thermal conductivity is only about half that of steel. Therefore, after welding, there will be significant internal stress in the joint.
2. The crystallization and solidification range of austenitic steel is wide, the crystallization process takes a long time, and the crystallization direction of austenite is strong, thus causing severe segregation of impurities.
3. Austenitic steel contains a large number of alloying elements. The interactions between these alloying elements or between them and impurities can also result in the formation of low-melting-point compounds and eutectics.
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