Cov thawv yas yog qhov tshwm sim ntau hauv peb lub neej, siv los ntim kua thiab cov khoom tawv hauv cov khoom ntim sab nraud. Nws cov nplaim zoo nkauj zoo nkauj, seam tsis siv vuam vuam tsis muaj vuam, lub teeb ceeb thawj, zoo compressive zog, cuam tshuam ua hauj, corrosion tsis kam, tsis muaj tshuaj lom thiab tsis muaj ntxhiab, thiab kev thauj mus los yooj yim. Kev siv lub sijhawm yog ntev, nyob rau hauv ib txwm muaj, kev thauj mus los thiab kev tswj tuav, lub sijhawm cia yog 1.5 xyoo. Cov cuab yeej kev qhia ntawm cov khoom lag luam nruj me ntsis raws cov qauv, thiab cov qauv tsim kev lag luam thiab cov qauv khoom kuj tuaj yeem ua raws li qhov yuav tsum tau ua.
Yuav siv tau rau kub txhaws, qhov kub qhov kub thiab txias yuav tsum tsis pub tshaj 60 ℃. Tom qab kub sau, lub hau thiab lub ci yuav tsum kaw kom nruj tom qab cov ntsiab lus txaus txaus thiab txias rau chav sov. Yog tias nws yooj yim los khaws cov khoom siv tshuaj lom neeg xoob, ib qho npog nrog sab nraud ua haujlwm tuaj yeem thov kom tsis txhob muaj kev phom sij thaum caij tsheb thauj mus los, thiab tseem ua kom paub meej cov khoom sib khi ntawm cov kua.
Thaum sau cov thawv ntim yas, txhawm rau kom muaj kev nyab xeeb ntawm cov neeg siv, sab nrauv hlau kab ntawm cov yas ntim cov tub lag luam yuav tsum tau siv cov electrostatic induction grounding device nrog lub tswb ntsuas kom txuas nrog, uas yog qhov tseem ceeb heev. Thaum sau, txhua tus yuav tsum them sai sai rau cov txheej txheem tshwj xeeb. Thaum lub sijhawm sau, daim ntaub yas asbestos nrog lub rwb thaiv tshav kub, tiv thaiv hluav taws thiab antistatic yog them ntawm qhov nkag ntawm lub hnab yas yas kom txo cov roj uas tsim los ntawm cov evaporation ntawm cov khoom nyoos thaum sau.
Txawm hais tias daim ntawv thov ntu ntawm yas nruas yog qhov ntau, qhov nruj ntawm cov yas nruas yog qhov tseem ceeb heev. Txwv tsis pub, qhov kev thauj mus los ntawm txhua tus yuav muaj qhov cuam tshuam ntau dua, yog li nws yuav tsum siv cov cua txias cua txias rau lub taub ntim rau cov tog raj nitrogen. Nitrogen foob rau hauv lub thoob tawm. Lub thoob yas thoob kev lag luam tsis tshua hais txog qhov hnyav lub teeb. Qhov tseeb, piv nrog lub hwj yas thiab lub fwj iav, qhov hnyav lub teeb ntawm cov thoob yas ua rau cov thoob yas tsis ruaj khov.
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