Ukwelashwa kokushisaingenye yezinqubo ezibalulekile ezibalulekile ekusunguleni inqubo yokukhiqiza ukufa, edlala indima ebalulekile empilweni ye-die. Ngokuvumelana nezidingo ezithileubuchwepheshe bokuqamba, ubuchwepheshe bokwelapha ukushisa buklanyelwe ukwenza amandla (ukuqina) kwesikhunta kufane ngokufanele ngokuqina, ubunzima obungaphezulu bomzimba wesikhunta kanye nesikhunta sesikhunta sinengqondo futhi sifana, okusanhlamvu kuhle futhi kufana, akukho oxidation futhi i-decarburization, inciphisa ukucindezeleka okusele kanye nokuguqulwa, okungathuthukisa impilo nokuzinza kwesikhunta. Ukusetshenziswa kobuchwepheshe obusha bokwelapha ukushisa kungathinta amandla wezinto ezibonakalayo futhi kuthuthukise kakhulu impilo yesikhunta ngezindleko ezincane. Isibonelo, nge-high-carbonukuganga okubandayo kuyafa, ukwamukela ukucisha izinga lokushisa eliphansi ukuze uthole i-lat Martensite eyengeziwe kungathuthukisa ukuqina, kunciphise ukubola kwesikhunta kanye nokucisha i-crack, ngaleyo ndlela kuthuthukise impilo yesikhunta. Ukwelashwa kokushisa kwe-vacuum kunezinzuzo zokungabi ne-oxidation, i-decarburization, i-degassing, ukushisa okufanayo kanye nokuguqulwa okuncane, okubuye kube nenzuzo ukuthuthukisa impilo yokufa.

Umphumela wokwelashwa okungaphezulu ekuqiniseni ubuso besikhunta kanye nokwandisa impilo yesikhunta akuyona nje ephawulekayo, kodwa futhi nezindleko eziphansi. Isetshenzisiwe futhi inezicelo ezingaba khona zesikhunta sokuqiniswa kwendlela yokwelashwa kwe-bore surface ine-deformation (i-shot peening, extrusion and rolling, njll.) iqinisa, ukuqinisa ukuguqulwa kwesigaba sobuso, ukuqinisa ukunwetshwa kwengaphezulu kanye nokuqinisa ukufakwa kwe-ion, ngokomzimba. Ukufakwa komhwamuko kanye nobuchwepheshe bokuguqula indawo engaphezulu njengobuchwepheshe be-membrane njengokufakwa komhwamuko wamakhemikhali, kanye nobuchwepheshe be-electrochemical deposition (i-electroplating) kanye ezishisayo zokufafaza ezinengilazi.

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