In the stainless steel welding industry, there are many processing plants that use laser welding to process stainless steel products, and the finished product of this welding process is also very good. Therefore, if you need to weld 304 stainless steel materials, it is more appropriate to choose laser welding.

Laser welding of stainless steel materials has many advantages. Compared with traditional welding processes, low-power pulse laser seam welding is characterized by high power density, concentrated energy, low heat input, narrow weld seams and low deformation, and the laser beam is focused. Finally, a very small light spot can be obtained and precise positioning can be carried out. These characteristics make laser seam welding more suitable for welding small-sized workpieces than other welding processes.

For laser welding of ultra-thin stainless steel plates, because the material is very thin, it is easy for vaporization and perforation to occur. In order to obtain a continuous weld without burn-through, it is important to accurately control the parameters.

The main parameters that affect the quality of laser welding include welding current, pulse width, pulse frequency, etc. Its influencing effects mainly include the following aspects.

First, as the current increases, the width of the weld of the stainless steel plate will also increase. During the welding process, spatter will slowly occur, and the surface of the weld will be oxidized and have a rough feel.

As the pulse width increases, the width of the weld will also continue to increase. The change of pulse width has obvious influence on the laser welding effect of stainless steel ultra-thin plate. A slight increase in pulse width may cause the stainless steel plate to be oxidized and burned through.

As the pulse frequency increases, the welding spot overlap rate will also increase, and the welding seam width first increases and then remains basically unchanged. When observed under a microscope, the weld will also become smoother and more beautiful. However, when the pulse frequency increases to a certain value, the welding process will cause serious spatter, the weld will become rougher, and oxidation will occur on the upper and lower surfaces of the welded parts.

It is best to use positive defocus for laser welding of ultra-thin stainless steel plates. Under the same defocus amount, the surface aesthetics and smoothness of the weld seam obtained by positive defocus laser welding are better than those obtained by negative defocus.