Compared with traditional welding, low-power pulse laser seam welding has the advantages of high power density, concentrated energy, small heat input, narrow weld seam and small deformation. Moreover, after focusing the laser beam, a small spot can be obtained and can be accurately positioned. These The characteristics make laser seam welding more suitable for welding small-sized workpieces than other welding methods. For laser welding of ultra-thin stainless steel materials, the 301 stainless steel strip is easy to vaporize and perforate because the material is very thin. If you want to get a continuous weld without burning through. The key is precise control of parameters.

The main parameters that affect the quality of laser welding include welding current, pulse width, pulse frequency, etc. The main influencing effects are as follows:

(1) Positive defocus is suitable for laser welding of ultra-thin plate materials. Under the same defocus amount, the weld surface obtained by positive defocus laser welding is smoother and more beautiful than that obtained by negative defocus.

(2) As the current increases, the width of the weld increases, spatter gradually appears during the welding process, oxidation occurs on the surface of the weld, and it feels rough.

(3) As the pulse width of the 301 stainless steel strip increases, the width of the weld also increases. Changes in pulse width have a significant impact on the laser welding effect of stainless steel ultra-thin plates. A slight increase in pulse width may cause the sample to be oxidized and burned through.

(4) As the pulse frequency increases, the overlap rate of solder joints increases, and the width of the weld seam increases first. remains basically unchanged. Observed under a microscope, the welds become smoother and more beautiful. However, when the pulse frequency increases to a certain value, the welding process causes serious spatter, the weld seam becomes rough, and oxidation occurs on both the upper and lower surfaces of the welded parts.