Laser welding of ultra-thin stainless steel
Welding of stainless steel. Stainless steel is widely used in various industries because of its good corrosion resistance, non-toxicity, friction resistance, high strength, non-magnetic, easy processability, and good weldability. In the laser welding industry, there are many manufacturers that use laser welding of stainless steel workpieces, and stainless steel is also the best welded among many materials, and the effect is the best.
Compared with traditional welding, the low-power pulsed laser seam welding has the advantages of high power density, concentrated energy, small heat input, narrow weld seam and small deformation. Moreover, after the laser beam is focused, a small spot can be obtained, which can be precise Positioning, these 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, because the material is very thin, it is easy to vaporize and perforate. In order to obtain a continuous weld without burn-through, the key is to accurately control the parameters.
The main parameters that affect the quality of laser welding are welding current, pulse width, pulse frequency, etc. The main effects are as follows:
1. With the increase of the current, the width of the welding seam increases, and the welding process gradually shows splashes, and the surface of the welding seam appears oxidized and has a rough feeling.
2. As the pulse width increases, the width of the weld is also increasing. The change of pulse width has a significant effect on the welding effect of the laser welding machine for stainless steel ultra-thin plates. A slight increase in the pulse width may cause the sample to be oxidized and burned through.
3. As the pulse frequency increases, the overlap rate of solder joints increases, and the width of the welds increases first. Basically remain unchanged afterwards. Observed under a microscope, the weld is getting smoother and more beautiful. However, when the pulse frequency increases to a certain value, the welding process spatters severely, the weld becomes rough, and the upper and lower surfaces of the welded parts are oxidized.
4. Laser welding of ultra-thin plate materials is suitable for positive defocusing. Under the same defocusing amount, the weld surface obtained by positive defocusing laser welding is smoother and more beautiful than negative defocusing.
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