casquillas = bushings or sleeves, most likely; columna = column or post; brida = clamp; portaelectrodos = electrode holder (also acceptable: carrier, chuck, or socket; the drawing, if you have one, should point you toward the right choice); pletina = bar, flat (as a noun), or small plate; caratula de maniobra = control panel (the additional information makes it clear; apologies for my earlier suggestion!). -- As for the "distribuidores de petaca," these are obviously distribution valves or outlets located on the air cylinder. (A "petaca" is, among other things, a leather trunk or suitcase; a cigarette case; or a tobacco pouch; not much help there. What might help is a brochure or data sheet from a welding-equipment manufacturer, which you might find through a web search.) -- Perhaps someone else can clarify "lampara de linea" ("line lamp" or "track lamp") on the control panel. -- Wish I could be of more help! -- HC