From what depictions ive seen most of the regular foot soldiers, (not knights or men at arms) were wearing sallets without bevors, was this the norm or was there a more common type of helmet?
the Burgundian ordonnances from 1472 states that the Pikemen must be equipped with a "demi-teste salade" ("half-head Sallet", probably meaning an open-faced Sallet or some sort of cervelliere). Archers, them, are requested to have a "Salade sans visière" (sallet without visor).
This of course, doesn't mean it was the same everywhere in Europe. Equipment varies from place to place (for instance, celata helms were almost exclusively Italian, but Italy isn't my region) and time .