1. Tom qab cov hlau qauv vaj tsev tso rau hauv kev siv, nws yuav tsum tau ntxuav thiab tu kom tsis tu ncua. Hauv qhov xwm txheej ib txwm, nws yuav tsum tau kuaj xyuas thiab tuav ib xyoos ib zaug. Thaum ntxuav sab nraud ntawm phab ntsa ntawm cov tub luam hlau qauv, cov kev ua haujlwm hauv qab no yuav tsum raug zam: pob steel, phaj txhuam thiab lwm yam khoom ntxuav nrog kev sib tsoo yuav tsum tsis txhob siv, thiab cov dej huv yuav tsum siv txij toj mus rau hauv qab. Yog tias muaj cov ceg ntoo, nplooj thiab lwm yam khoom zoo sib xws ntawm cov qauv ntoo steel, lawv yuav tsum tau ntxuav hauv lub sijhawm kom tsis txhob ua rau cov teeb meem tsis tsim nyog nyob hauv qab ntawm cov khoom no. Yog tias cov hlau phaj saum npoo ntawm steel qauv chaw khaws khoom puas, nws yuav tsum tau kho kom ncav sijhawm kom tsis txhob muaj xeb ntawm cov hlau phaj saum npoo hauv lub hnub thiab nag. Yog tias tsim nyog, txhua qhov siab ntawm nano cov ntaub ntawv siv los tiv thaiv lub vaj huam sib luag hlau vov, thiab ua lub luag haujlwm zoo hauv kev tiv thaiv tshav kub thiab tiv thaiv dej, txuag hluav taws xob cua sab hauv tsev.
2. Tom qab cov hlau qauv chaw teeb tsa tau tsim, nws tsis raug tso cai hloov pauv nws cov qauv yam tsis muaj kev tso cai, tshem tawm txhua lub pob zeb thiab lwm qhov chaw, thiab ntxiv lossis txo cov phab ntsa kev faib tawm. Yog tias ib feem twg xav tau hloov, nws yog qhov yuav tsum tau sib tham nrog cov tuam txhab tsim khoom kom txiav txim siab tias nws tuaj yeem hloov pauv. Cov qauv hlau yuav tsum raug tswj nrog cov xim ib zaug tom qab nws siv tau li 3 xyoos, yog li ua kom lub tsev zoo nkauj thiab kev nyab xeeb. Lub tsev ntim cov qauv hlau txuas nrog cov qauv steel tsim, yog li hauv kev siv cov khoom siv hluav taws xob, xws li cov xov hlau thiab lwm yam, siv daim ntawv thov pob tw thiab cov yeeb nkab sib cais, txhawm rau kom tsis txhob muaj hluav taws xob sib tsoo.
