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首页> 外文期刊>Science and Technology of Welding & Joining >Optimisation of welding using two Nd–YAG laser beams combined at workpiece surface
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Optimisation of welding using two Nd–YAG laser beams combined at workpiece surface

机译：在工件表面使用两个Nd-YAG激光束进行焊接的优化

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摘要

Two Nd–YAG laser beams were combined at a certain point on the workpiece surface to increase weld penetration depth. One of the beams was a pulsed laser beam, and the other was a continuous wave laser beam or a modulated laser beam. Using this combination of laser beams, a wide range of welding conditions, such as average power, peak power, and power density, could be selected. A high peak power pulsed laser beam would play a significant role in forming a keyhole, but a severe spatter loss problem could be encountered under high peak power laser conditions, thus the conditions necessary to prevent spatter loss were investigated. The greatest penetration depth is obtained under the critical conditions for spatter loss. Critical conditions for spatter loss are controlled by the peak power of a pulsed laser beam, thus deeper weld penetration is obtained using a pulsed laser beam with higher average power, that is, of longer pulse width and/or a higher repetition rate within the limit of the oscillator output. Moreover, spatter loss is reduced under conditions providing large molten zones in the weld, thus a higher peak power pulsed laser beam can be employed under such conditions. Large molten zones are obtained using a modulated laser beam of a high average power and/or low welding speeds.
机译：在工件表面上的某个点，将两束Nd-YAG激光束组合起来以增加焊缝熔深。光束中的一个是脉冲激光束，另一个是连续波激光束或调制激光束。使用这种激光束组合，可以选择各种焊接条件，例如平均功率，峰值功率和功率密度。高峰值功率脉冲激光束在形成钥匙孔方面将发挥重要作用，但是在高峰值功率激光条件下可能会遇到严重的飞溅损失问题，因此研究了防止飞溅损失的必要条件。在飞溅损失的临界条件下可获得最大的渗透深度。飞溅损失的临界条件由脉冲激光束的峰值功率控制，因此，使用具有更高平均功率（即在极限范围内更长的脉冲宽度和/或更高的重复率）的脉冲激光束可以获得更深的焊缝熔深振荡器输出的而且，在焊缝中提供大的熔融区域的条件下，飞溅损失减少了，因此在这种条件下可以采用更高的峰值功率脉冲激光束。使用高平均功率和/或低焊接速度的调制激光束可获得较大的熔融区。

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  • 来源
    《Science and Technology of Welding & Joining》 |2000年第2期|113-119|共7页
  • 作者

    Narikiyo T.; Fujinaga S.; Takenaka H.; Ohmori A.; Inoue K.;

  • 作者单位

    Advanced Materials Processing Institute Kinki Japan, Amagasaki, Hyogo, Japan;

    Advanced Materials Processing Institute Kinki Japan, Amagasaki, Hyogo, Japan;

    Advanced Materials Processing Institute Kinki Japan, Amagasaki, Hyogo, Japan;

    Osaka University, Ibaraki, Osaka, Japan;

    Osaka University, Ibaraki, Osaka, Japan;

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