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Penetration depth control using an optical spectroscopic sensor in ND:Yag laser welding

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Figure

Figure 1 displays the emissions which can be detected with suitable sensors. The geometrical parameters of the keyhole and meltpool are measured with e.g
Figure 3 (Above) Electron temperature and correlation signal for a weld without defect
Figure 4 Gas shielding arrangement. [Fox et al. (2001)]
Figure 6). The described system can be augmented to a closed loop which adjusts the gas flow to maintain good shielding conditions
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