Ukuthethelelwa okukhulu, ngenxa yobukhulu babo obukhulu, izinqubo eziningi, umjikelezo omude, ongelona umfaniswano kule nqubo, kanye nezinto eziningi ezingazinzile, kuvame ukubangela ukufana okungathi sína kokuhlolwa kwempahla, ukuze kungakwazi ukudlulisa ukuhlolwa kwempahla emishini, ukuhlolwa kwe-metallographic kanye ne- Ukutholwa kwe-Fostudetitive face.

Ngenxa yokwahlukaniswa kokwakheka kwamakhemikhali, ukunqwabelana okufakiwe kanye nezinkinga ezahlukahlukene ze-pore ku-Ingot;
Lapho ukufudumeza, izinga lokushisa lishintsha kancane, ukusatshalaliswa akulingani, ukucindezelwa kwangaphakathi kukhulu, isici siningi;
Ukushisa okuphezulu nesikhathi eside kwakha, ukucindezelwa kwasendaweni kanye nokonakaliswa kwendawo, isimo sokugeleza kwepulasitiki, ukwakhiwa kwezingalo, ukusatshalaliswa kwezezimali kuhluke kakhulu;
Ngesikhathi sokupholisa, inqubo yokuphazamiseka ihamba kancane, ukuguqulwa kwezicubu kuyinkimbinkimbi futhi ukucindezelwa okwengeziwe kukhulu.
Zonke lezi zinto ezingenhla zingahle ziholele ku-inhomogeneity emibi yokusebenza kwezicubu kanye nekhwalithi engafaneleki.
Izinyathelo zokuthuthukisa ukufana kweukuthethelelwa okukhulu:
1. Amukelise ubuchwepheshe obuthuthukile bokuncoma ukuthuthukisa ikhwalithi yensimbi ye-Inot yensimbi;
2