Abstract: As an extension of our former work, this paper further shows the results of the intelligent methodologies, such as fuzzy-neural network and expert system techniques as applied to control of dynamic process of the weld pool and seam molding in pulsed gas tungsten arc welding. Based on the SISO fuzzy-neural network controller-- FNNC for regulating welding current in our former work, the expert system controller for regulating welding travel velocity has been designed in this paper, which establishs a DIDO intelligent controller for welding pool dynamic process and realizes simultaneously manipulating the top and back weld widths and molding. Combined with our former work, this paper has shown a successful investigation on intelligent control of arc welding pool dynamic process and weld quality.