1. Cov kev ua yuam kev los ntawm kev tsim ua tsis zoo thiab kev tsim cov khoom siv hluav taws xob txuas ntxiv muaj xws li: cov teeb meem hloov thiab teeb meem ntawm lub tshuab nqa, thiab cov teeb meem zoo ntawm qee qhov ntawm cov qhia pendant.
2. Kev tiv thaiv ib puag ncig tsis raug. Yog tias cov av noo hauv cov pa hauv qhov chaw tso pa ntau dhau thiab qhov cuam tshuam ntawm hluav taws xob zoo li qub, thiab lub vev xaib vuam yog qhov loj, nws yuav ua kom muaj plua plav hauv cov tswj hwm thiab ua rau tsis ua haujlwm.
3. Corrosive oxidation tshwm sim hauv lub interface ntawm lub rooj tsavxwm ntsaws, thiab kev sib cuag tsis zoo, uas ua rau lub cev tsis muaj peev xwm ua haujlwm lossis tsis ruaj khov ntawm cov khoom siv.
4. Tib neeg tsim kev ua yuam kev los ntawm kev ua haujlwm tsis zoo yog feem ntau ua rau kev puas tsuaj rau lub vuam txuas ntawm cov hlau vuam, kev thauj khoom tsis tsim nyog thiab thau tawm ntawm lub workpiece, thiab txoj haujlwm tsis deformed thaum tsiv.