Abstract
Magnesium-rare earth alloy was welded using the CO2 laser. The surface plasma of laser welding was studied by the spectra and also, the plasma temperature was calculated using the relative intensity of spectral line. The behavior of the plasma was observed with a high-speed camera. The relationship between the welding parameters and plasma temperature was discussed. The results show that laser power has little effect on plasma temperature. With increasing welding speed, plasma temperature decreases first, and then, increases. The cooling effect of the plasma using helium is significant. The plasma recoil is about 7,500 Pa during laser-welded NZ30K because of the lower boiling point of magnesium.
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