Galvanized steel yeeb nkab, nrog nws ob qhov zoo ntawm kev tiv thaiv corrosion thiab kev pab cuam lub neej ntev, ua ke nrog tus nqi qis, tau pom qhov nce ntawm kev siv. Txawm li cas los xij, kev tsis saib xyuas qee yam thaum lub sij hawm vuam tuaj yeem ua rau muaj teeb meem tsis tsim nyog. Dab tsi yog cov ntsiab lus tseem ceeb thaum vuam galvanized steel kav?
Kev sib tsoo yog qhov tseem ceeb
Cov txheej galvanized ntawm qhov chaw vuam yuav tsum tau muab tshem tawm, vim tias nws lub xub ntiag tuaj yeem ua rau npuas, lub tshuab nqus tsev, thiab cov welds cuav. Tsis tas li ntawd, nws tuaj yeem ua rau qhov sib koom ua ke nkig thiab txo nws cov rigidity.
Cov yam ntxwv ntawm Vuam Galvanized Steel
Galvanized steel feem ntau muaj txheej txheej zinc txheej (kwv yees li 20um tuab) tshaj cov hlau tsis tshua muaj carbon. Zinc muaj qhov melting point ntawm 419 degree thiab qhov kub ntawm kwv yees li 908 degree. Thaum lub sij hawm vuam, zinc melts rau hauv cov kua thiab ntab rau saum npoo ntawm lub pas dej ua ke los yog sib sau ua ke ntawm lub hauv paus ntawm lub vuam. Zinc muaj cov khoom solubility siab hauv cov hlau, tso cai rau cov kua zinc nkag mus rau hauv cov hlau weld raws li cov ciam teb, ua rau "kua hlau embrittlement" vim qhov qis melting point ntawm zinc.
Tsis tas li ntawd, zinc thiab hlau tuaj yeem tsim cov khoom sib txuas sib txuas, uas txo cov plasticity ntawm cov hlau vuam thiab tuaj yeem ua rau cov kab nrib pleb hauv kev ntxhov siab. Angular welds, tshwj xeeb tshaj yog cov nyob rau hauv T-joints, yog nquag nkag mus rau cov kab nrib pleb. Cov zinc txheej ntawm qhov zawj ntawm qhov chaw thiab cov npoo, nyob rau hauv lub tshav kub ntawm lub arc, undergoes oxidation, melting, evaporation, tso pa dawb thiab chav, uas yuav pab tau rau porosity nyob rau hauv lub weld.
ZnO tsim los ntawm oxidation muaj lub siab melting point (siab tshaj 1800 degree). Yog tias qhov ntsuas vuam tau teeb tsa qis dhau, ZnO suav nrog yuav tshwm sim. Tsis tas li ntawd, zinc ua raws li deoxidizer, ua rau tsim cov oxides uas tsis tshua muaj melting xws li FeO-MnO lossis FeO-MnO-SiO2. Thaum kawg, cov evaporation ntawm zinc ua rau ntau cov pa taws dawb, uas tuaj yeem ua rau khaus thiab ua rau tib neeg lub cev, ua rau pom qhov tseem ceeb ntawm kev sib tsoo ntawm cov galvanized txheej ntawm qhov chaw vuam.
Vuam txheej txheem tswj
Kev npaj ua ntej vuam rau galvanized steel zoo ib yam li cov hlau uas tsis muaj cov pa roj carbon monoxide, nrog rau kev saib xyuas tshwj xeeb rau kev npaj cov zawj qhov ntev thiab tshem tawm cov txheej galvanized nyob ze. Txhawm rau ua tiav kev nkag mus, lub kaum sab xis yuav tsum tsim nyog, feem ntau 60-65 degree, nrog qhov sib txawv ntawm 1.5-2.5mm. Txhawm rau txo cov zinc nkag mus rau hauv qhov vuam, txheej txheej galvanized hauv qhov zawj yuav tsum tau muab tshem tawm ua ntej vuam.
Vuam txheej txheem: Thaum welding thawj txheej ntawm ntau txheej weld, yuav tsum tau ua kom yaj thiab tom qab vaporize zinc txheej, tso cai rau nws khiav tawm ntawm qhov sib koom ua ke, txo qis cov kua zinc. Ib yam li ntawd, thaum welding fillet welds, zinc txheej yuav tsum tau yaj thiab vaporized thaum lub sij hawm thawj txheej los ntawm pib txav cov electrode ntsis rau pem hauv ntej li ntawm 5-7 hli, rov qab mus rau qhov qub txoj hauj lwm thaum lub zinc txheej tau yaj, thiab txuas ntxiv nrog. qhov vuam. Rau kab rov tav thiab ntsug vuam txoj haujlwm, siv luv-slag electrodes zoo li J427 txo qis qis qis. Kev ua haujlwm ntawm kev sib tsoo thaum lub sij hawm welding tuaj yeem ua kom cov vuam tsis zoo.
