Cov txheej txheem tsim khoom rau cov khoom khaws cia feem ntau pib nrog kev ua cov khoom siv raw, siv ntau txoj hauv kev nyob ntawm cov khoom siv. Hauv kev tsim cov khoom siv hlau, cov txheej txheem yog qhov nyuaj, feem ntau suav nrog stamping, dabtsi yog khoov, vuam, thiab kho qhov chaw. Cov ntawv hlau yog thawj zaug txiav thiab zoo li tus rau hauv lub txee lossis thav duab, tom qab ntawd sib sau ua ke thiab ntxiv dag zog siv vuam lossis bolts. Txhawm rau txhim kho kev ua haujlwm ntev thiab zoo nkauj, degreasing, xeb tshem tawm, thiab phosphating kev kho mob tau ua, ua raws li electrostatic hmoov txheej, electroplating, los yog ci xim los tsim ib txheej tiv thaiv, txhim kho xeb thiab corrosion kuj thiab txhim kho tag nrho cov khoom zoo.
Nyob rau theem khoom tiav, yuav tsum tau ua tib zoo sib dhos thiab tshuaj xyuas zoo. Qhov no suav nrog kev sim cov tub rau khoom swb, kuaj xyuas kev ruaj ntseg, thiab thauj khoom-cov kabmob kuaj kom paub meej cov khoom muaj kev nyab xeeb thiab kev ntseeg siab hauv kev siv tiag tiag. Qee cov khoom lag luam siab - kawg khaws cia tseem suav nrog cov qauv tsim qauv lossis cov txheej txheem ntse, xws li cov qauv tsim tawm, sib nqus sib txuas, lossis cov qauv muab faib zais, muab cov khoom lag luam ntau dua thiab qhov chaw hloov pauv thaum ua tiav cov haujlwm khaws cia yooj yim. Zuag qhia tag nrho, qib ntawm cov khoom siv tes ua haujlwm hauv cov khoom khaws cia ncaj qha txiav txim siab lawv lub neej, kev ua haujlwm zoo, thiab cov neeg siv kev paub.