surface finish:spray painting, degreasing,phosphatizing,Teflon, wire drawing, silk screen, electroplating, sand blasting, brush grain, oxidation, zinc plating, passivating, pickling.
welding:
arc welding,gas welding,butt welding,spot welding,plug welding,seam welding,overlaying welding,flat welding,horizontal welding,vertical welding,overhead welding