Abstract
In deep penetration laser welding, a laser beam will penetrate into a workpiece to form a slender capillary, denoted as as well as violent plasma generation. Plasma resides both outside and inside the keyhole, and is known as and respectively. In this paper, we developed a light emission measurement model and a plasma intensity density distribution estimation scheme to determine the plasma distribution inside the keyhole along the keyhole depth direction. The results show that the peak plasma intensity is located close to the keyhole opening, which can affect laser beam absorption and weld shape.
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