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Greatly improve the quality of laser pointer welding

It is reported that Mitsubishi Electric and its brand Tada Electric are jointly developing a new type of fiber laser welding technology, which can reduce the splashed molten metal (splash) by 95% or more compared with the traditional welding technology using hot rolled materials. .

Conventional spatter levels reduce the quality and speed of fiber laser pointer soldering, while new low spatter technology improves the quality and productivity of high power fiber laser welding for industrial applications such as steel processing, automotive production and electrical equipment installation. The new technology is expected to be included in the laser welding machine that will appear in 2019.

During the laser welding process, deep penetration holes and molten metal pools are formed in the area irradiated by the laser beam. You can get more penetration by increasing the laser pointer power, but this will produce more spatter. Therefore, the two companies studied the molten pool under various welding conditions and performed more than 10,000 experiments with a high-speed camera. It was found that the generation of spatter can be greatly suppressed by irradiating a low-power laser beam around a high-power beam. Subsequently, by using a newly developed beam shaping system mounted at the output of the fiber, simultaneous high-power lasers focused at the same point were simultaneously illuminated by low-power lasers, and tests using 10 kW high-power fiber lasers confirmed the tradition of working at the same welding speed. Compared to the system, spatters may be reduced by more than 95%.

In conventional fiber laser pointer welding, spatter is significantly increased at certain welding speeds, so the welding speed needs to be reduced to ensure the quality of the weld. After using this new technology, the amount of spatter generated by increasing the welding speed is extremely small, so that the laser power can be fully utilized.

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