Spectra analysis and temperature measure of plasmas in YAG-MIG hybrid welding of 5A90

The spectra of vapor/plasmas were acquired by spectrometer during YAG-MIG hybrid welding of 5A90 Al-Li alloys in our research. The temperature values of the vapor/plasmas were calculated by the methods of relative intensity.The effects of arc current and heat input on the temperature of the vapor/plasmas were discussed.The results show that the spectra of hybrid welding in the range of 350-850 nm is mainly argon ion spectra line accompanied with a few Mg and Li ion.An average temperature under a set of processing parameters is 6554 K;compared to YAG welding, the value has an increase of 1200 K;however, it is near to the average temperature of MIG welding.