1.Dab tsi yog xeb dawb?
Ua ntej, nws yog ib qho tseem ceeb kom nkag siab qhov xwm ntawm cov xeb dawb. Cov khoom tseem ceeb ntawm cov xeb dawb yog zinc hydroxide thiab zinc carbonate. Nws yog ib yam khoom thaum ntxov ntawm corrosion tshwm sim nyob rau hauv galvanized txheej nyob rau hauv ntub, tsis zoo ventilated ib puag ncig. Koj tuaj yeem xav tias nws yog "tus kab mob zinc."
2.Dab tsi yog qhov ua rau thiab qhov tshwm sim ntawm vuam tsis xws luag?
Ua rau: Dawb xeb thiab nws txuas nrog cov dej noo (dej ntawm crystallization) sai sai decompose thaum raug kub kub ntawm vuam, ua rau ntau cov dej vapor, hydrogen, thiab oxygen.
Qhov tshwm sim:
Porosity: Cov pa roj no, tsis tuaj yeem khiav tawm ntawm cov hlau molten, tsim pores sab hauv thiab ntawm qhov chaw ntawm qhov vuam. Porosity ua rau txo cov ntoo khaub lig ua haujlwm tau zoo- ntu ntu ntawm qhov vuam, ua rau cov vuam tsis muaj zog, plasticity, thiab ntom.
Intense Spatter: Kev nthuav dav sai ntawm cov pa roj ua rau arc instability thiab khaus hlau spatter, cuam tshuam rau weld hlaws tsim thiab kis kab mob welding torch thiab workpiece nto.
3.Dab tsi yog qhov ua rau thiab qhov tshwm sim ntawm yam cuam tshuam rau arc stability thiab weld tsim?
Ua rau: Cov txheej xeb dawb yog cov khoom tsis sib xws, tsis huv, thiab cov khoom siv hluav taws xob. Thaum lub sij hawm welding, nws cuam tshuam nrog kev ruaj ntseg ntawm hluav taws xob arc, ua rau nws hloov.
Qhov tshwm sim: Qhov no ua rau muaj kev ntxhib los mos, tsis muaj qhov sib txuas, nrog rau qhov tsis xws luag xws li undercut thiab nkag tsis tiav.
4.Dab tsi yog qhov ua rau thiab qhov tshwm sim ntawm kev txo corrosion hauv welds?
Ua rau:
Thaum lub sij hawm vuam txheej txheem, zinc txheej nyob rau hauv thiab ib ncig ntawm lub dawb xeb cheeb tsam yog puas. Qhov tshwm sim ntawm cov hlau nws tus kheej tsis muaj zinc, thiab nws cov corrosion kuj yog qis dua li ntawm cov hlau galvanized.
Cov teeb meem xws li porosity thiab kab nrib pleb muab txoj hauv kev rau corrosive media, tso cai rau corrosion pib ntawm cov ntsiab lus tsis muaj zog thiab kis mus rau sab hauv thiab sab nraud.
Qhov tshwm sim: Cov welded sib koom ua ke ua thawj feem ntawm tag nrho cov qauv kom xeb los ntawm, tsim kom muaj "kev sib txuas tsis muaj zog" thiab txo qhov zoo ntawm corrosion kuj zoo ntawm galvanized steel.
5.Dab tsi yog qhov ua rau thiab qhov tshwm sim ntawm vuam nyuaj thiab cov pa phem?
Ua rau: Lub xub ntiag ntawm cov xeb dawb ua rau cov txheej txheem welding tsis tuaj yeem xav tau, xav kom cov welder nquag kho qhov tsis zoo, ua rau kev ua haujlwm nyuaj. Nyob rau tib lub sijhawm, zinc evaporation ntawm qhov kub thiab txias ua rau ntau cov zinc vapor, uas oxidizes nrog huab cua los ua zinc oxide fumes.
Qhov tshwm sim: Kev nqus cov zinc oxide pa tuaj yeem ua rau "hmoov hlau fume" hauv cov vuam, ua rau cov tsos mob xws li kub taub hau, ua daus no, thiab xeev siab, ua rau muaj kev phom sij rau lawv txoj kev noj qab haus huv. Dawb xeb exacerbates fume ntau lawm.