On the Bead Geometry of Dissimilar Joints between SA516Gr65 and 304L Produced by TIG and A-TIG Welding

Dissimilar autogenous square butt joints between SA516Gr65 and 304L steels were produced by TIG welding and A-TIG welding with SiO2 and TiO2single component fluxes used in the as-received condition and dried at 150°C for one hour. Results showed that with A-TIG welding considerable improvement in depth of penetration could be achieved. Reversal of Marangoni convection could be the operative mechanism with the use of flux in the as-received condition while arc constriction could also contribute with the use of dried fluxes. Between the two single component fluxes viz., SiO2 and TiO2 studied SiO2 was found to be more effective in improving the depth of penetration.