1. Ukungcangcazela.
Xa isikrufu sinomhlwa, akuvumelekanga ukuba sisuswe ngenkani ngesikrufu. Cofa isikrufu ngesikrufu, uqhekeze iindawo ezahlukeneyo kwindawo yokugqwala, jika isikrufu ngasekhohlo nasekunene ngesikrufu, uze emva koko usisuse isikrufu. Sachithwa.
2. Umlilo.
Ukuba isikrufu sinomhlwa kakhulu, ungasebenzisa i-electric welding ukuze u-oxidize isikrufu, utshise isikrufu sibe bomvu, uze ulahle ioyile yokuthambisa kwisikhewu sesikrufu, ulinde ixesha elithile, uze ususe isikrufu ngesikrufu.