Galvanized steel yeeb nkab, nws muaj ob qhov zoo ntawm kev tiv thaiv corrosion thiab kev pab cuam lub neej ntev, thiab tus nqi kuj qis, yog li tam sim no nws cov nqi siv tau nce siab dua, tab sis qee cov neeg siv tsis xyuam xim thaum vuam galvanized yeeb nkab, Nws tau tshwm sim. qee qhov teeb meem tsis tsim nyog, yog li cov teeb meem dab tsi yuav tsum tau them rau thaum vuam galvanized kav?
01 Lub hauv paus yog polished
Cov txheej galvanized ntawm lub vuam yuav tsum tau polished, txwv tsis pub npuas, trachoma, vuam cuav, thiab lwm yam yuav tshwm sim. Nws tseem yuav ua rau cov weld brittle thiab txo cov rigidity.
02 Vuam yam ntxwv ntawm galvanized hlau
Galvanized steel feem ntau coated nrog ib txheej ntawm zinc nyob rau sab nraud ntawm cov pa roj carbon tsawg, thiab galvanized txheej feem ntau yog 20um tuab. Zinc muaj qhov melting point ntawm 419 ° C thiab qhov kub ntawm ib ncig ntawm 908 ° C. Thaum lub sij hawm vuam, zinc melts mus rau hauv cov kua uas ntab rau saum npoo ntawm lub pas dej molten los yog ntawm lub hauv paus ntawm lub weld. Zinc muaj cov khoom solubility loj hauv cov hlau, thiab cov kua zinc yuav ua rau cov hlau sib sib zog nqus ntawm cov ciam teb, thiab zinc nrog cov ntsiab lus melting tsawg yuav tsim "kua hlau embrittlement". Nyob rau tib lub sijhawm, zinc thiab hlau tuaj yeem tsim cov khoom sib txuas sib txuas sib txuas, thiab cov theem nkig no txo cov plasticity ntawm cov hlau vuam thiab ua rau cov kab nrib pleb nyob rau hauv qhov kev ua ntawm tensile stress. Yog hais tias lub fillet welds yog welded, tshwj xeeb tshaj yog cov fillet welds ntawm T-joints, nkag mus rau hauv lub feem ntau yuav tshwm sim. Thaum galvanized hlau yog welded, zinc txheej ntawm qhov zawj thiab ntug yuav oxidized, melted, evaporated thiab dawb pa luam yeeb thiab chav yuav volatilized nyob rau hauv qhov kev txiav txim ntawm arc tshav kub, uas yuav yooj yim ua rau weld pores. Lub ZnO tsim vim oxidation muaj qhov siab melting point, siab tshaj li ntawm 1800 ° C. Yog tias qhov ntsuas me me dhau ntawm cov txheej txheem vuam, nws yuav ua rau ZnO slag suav nrog, thiab tib lub sijhawm. Txij li Zn dhau los ua deoxidizer. Ua FeO-MnO lossis FeO-MnO-SiO2 qis melting point oxide slag. Qhov thib ob, vim yog evaporation ntawm zinc, ntau cov pa luam yeeb dawb yog volatilized, uas yog khaus thiab ua rau tib neeg lub cev. Yog li ntawd, txheej galvanized ntawm qhov chaw vuam yuav tsum tau polished thiab pov tseg.
03 Vuam txheej txheem tswj
Kev npaj ua ntej vuam ntawm galvanized steel yog tib yam li cov hlau tsis tshua muaj carbon steel. Nws yuav tsum raug sau tseg tias qhov zawj loj thiab cov txheej galvanized nyob ze yuav tsum tau ua tib zoo saib xyuas. Rau kev nkag mus, qhov zawj me me yuav tsum tsim nyog, feem ntau 60 ~ 65 °, nrog rau qhov sib txawv, feem ntau 1.5 ~ 2.5mm; Txhawm rau txo qhov nkag mus ntawm zinc rau hauv qhov vuam, cov galvanized zawj hauv qhov zawj tuaj yeem raug solder tom qab txheej txheej raug tshem tawm.
Hauv kev ua haujlwm tiag tiag, centralized beveling, tsis muaj blunt ntug txheej txheem tau txais kev tswj hwm hauv nruab nrab, thiab cov txheej txheem vuam ob txheej yuav txo tau qhov kev nkag mus tsis tiav. Lub vuam pas nrig yuav tsum raug xaiv raws li cov khoom siv hauv paus ntawm cov yeeb nkab steel galvanized. Rau cov hlau tsis tshua muaj hlau, nws yog qhov ntau dua los xaiv J422 vim qhov kev xav ntawm kev ua haujlwm yooj yim.
Vuam txoj kev: Thaum welding thawj txheej ntawm weld seam nyob rau hauv ntau txheej welding, sim yaj cov zinc txheej thiab ua rau nws vaporize, evaporate thiab khiav ntawm weld seam, uas tuaj yeem txo cov kua zinc tshuav nyob rau hauv weld seam. Thaum welding lub fillet weld, kuj sim yaj cov zinc txheej ntawm thawj txheej thiab ua kom nws vaporize thiab evaporate kom dim ntawm qhov vuam. Txoj kev yog txav mus rau qhov kawg ntawm electrode rau pem hauv ntej txog 5 ~ 7 hli, thaum zinc txheej Tom qab melting, rov qab mus rau qhov qub txoj hauj lwm thiab txuas ntxiv mus rau pem hauv ntej. Rau kab rov tav vuam thiab ntsug vuam, yog siv cov slag electrodes luv luv xws li J427, qhov nyiam ntawm undercutting yuav me me; Yog tias siv cov cuab yeej siv rov qab mus rau pem hauv ntej thiab rov qab, cov khoom siv vuam tsis zoo tuaj yeem tau txais.
Post lub sij hawm: Mar-15-2023
