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ULTRA HIGH SPEED CAMERA INVESTIGATIONS OF LASER BEAM WELDING

机译：超高速摄像机对激光束焊接的研究

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With the help of high speed camera equipment, researchers can now directly observe melt flow phenomena which only could be imagined or simulated in the past. In this paper the motion of the molten metal inside the keyhole has been observed at frame rates as high as 180000 fps to provide useful information about the laser beam welding process. This paper describes two different cases where high speed imaging has given new insights into the laser beam welding process: A. In pulsed welding the melt pool oscillations can create ripples on the solidified weld surface. With the help of a high speed camera this phenomenon was analyzed, and the pulse shape was adjusted to reduce the ripple amplitude to a minimum. B. In Zn-coated steel edge welding it could be seen that blowouts were sometimes created in the melt pool at some distance behind the keyhole. Direct slow-motion observation has led to the formulation of a phenomenological model of this effect.
机译：在高速相机设备的帮助下，研究人员现在可以直接观察熔体流现象，这些现象只能在过去的想象或模拟。在本文中，在高达180000FPS的帧速率下观察到匙孔内的熔融金属的运动，以提供关于激光束焊接过程的有用信息。本文介绍了两个不同的情况，其中高速成像对激光束焊接过程具有新的见解：A。在脉冲焊接中，熔池孔振荡可以在凝固的焊接表面上产生涟漪。借助高速摄像机的帮助，分析了这种现象，并且调整了脉冲形状以将纹波幅度降低到最小值。 B.在Zn涂层钢边缘焊接中，可以看出，井喷在匙孔后面的熔池中有时在熔池中产生井喷。直接慢动作观察导致了这种效果的现象学模型的制定。

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