Qufulka fiilada oo dhan waxa kale oo loo yaqaan dhammaan xidhidhiyaha fiilada, qalabka kala duwan sida taayirrada gacanta iyo fiilada dabacsan ee ku wareegsan beddelka gacanka, beddelka iyo gacanka korontada, gacanka albaabka armaajooyinka korontada, iwm. daloolka jirka (kaliya ku hay qufulka fiilada ee godadka fiilada), ilaa inta fiilada si adag loo xiro si loo debciyo qufulka fiilada, ka dibna daldal qufulka badbaadada iyo calaamadaha qufulka.