Spectral Analysis of Welding Plasma of Magnesium Alloy Using Flux Coated Wire

Abstract

The activated flux coated wires are used to examine the effect of the fluxes on the weld penetration of the magnesium alloy. A series of emission spectroscopy of arc plasma for TIG welding for magnesium with normal wire and activated flux coated wire are developed. It is found that intensities of emission spectra of Mg I increase significantly when the flux wires are used. All the flux coated wire can increase the weld penetration of the TIG welding. The electron temperature and electron density of welding plasma are estimated. The result indicated that the electron temperature of arc plasma decrease when the flux coated wires are used; on the contrary, the electron density of the plasma got enhanced. It is believed that the current density increases with the electron density increase, which is one of the reasons that the penetration depth increase when the flux wires are used.