1.Vim li cas thiaj li yuav tsum tau tshem tawm cov oxide txheej?
Porosity:
Zinc muaj cov ntsiab lus melting ntawm kwv yees li 420 ° C thiab qhov kub ntawm kwv yees li 907 ° C.
Hlau muaj qhov melting point ntawm kwv yees li 1500 ° C, uas yog nyob rau hauv lub melting point ntau yam zoo tib yam vuam hlau.
Nyob rau hauv lub siab kub ntawm ib tug hluav taws xob arc, zinc nyob rau hauv lub weld cheeb tsam sai sai evaporates thiab boils, ua zinc vapor. Yog tias qhov vapor no tsis tuaj yeem khiav tawm ntawm lub pas dej molten nyob rau lub sijhawm, nws yuav tsim ntau qhov hws tom qab cov hlau weld solidifies, ua rau cov weld tsis muaj zog thiab ntom ntom.
Weld Spatter:
Qhov khaus evaporation ntawm zinc cuam tshuam qhov kev ruaj ntseg ntawm cov hluav taws xob arc thiab ua rau cov molten hlau splatter nyob txhua qhov chaw, uas ua rau muaj qhov tsis pom kev zoo thiab ua kom huv si.
Tsis muaj Fusion thiab Cracks:
Cov oxide txheej thiab cov khoom paug ntawm qhov chaw cuam tshuam zoo fusion ntawm lub hauv paus hlau thiab cov hlau muab tub lim, yooj yim ua rau tsis muaj fusion tsis xws luag.
Tsis tas li ntawd, zinc nkag mus rau hauv weld grain ciam teb ua ntu zus, ua rau cov weld muaj kev cuam tshuam rau kub tawg.
2.Yuav ua li cas kom huv si ua ntej- vuam tu?
Mechanical Cleaning (Feem ntau):
Angle Grinder + Sib Tsoo Log / Hlau Log: Qhov no yog txoj hauv kev zoo tshaj plaws thiab meej. Sib tsoo lub log los yog louvered hniav tuaj yeem tshem tawm cov oxide thiab zinc txheej. Stainless hlau hlau log kuj ua haujlwm zoo thiab ua rau muaj kev puas tsuaj tsawg rau cov substrate.
Cov ntaub ntawv, Sandpaper: Rau cov chaw me me lossis cov ces kaum, cov ntawv xuab zeb ntxhib lossis cov ntaub ntawv tuaj yeem siv rau polishing.
Tshuaj ntxuav:
Cov tshuaj ntxuav tshwj xeeb lossis cov kua qaub diluted (xws li hydrochloric acid) tuaj yeem yaj cov zinc oxide thiab cov yeeb yaj kiab passivation, tab sis nws yog ib qho tseem ceeb uas yuav tsum tau yaug kom huv si nrog dej thiab cia kom qhuav tom qab ntawd. Txwv tsis pub, cov tshuaj residual tuaj yeem tsim cov pores tshiab thiab cov pa phem thaum lub sij hawm vuam. Cov txheej txheem tshuaj feem ntau tsis pom zoo rau cov tsis yog-cov kws tshaj lij.
3.Yuav ua li cas xaiv txoj kev vuam thiab txheej txheem?
Vuam txoj kev xaiv:
Gas Shielded Vuam (GAW): Tshwj xeeb tshaj yog MAG vuam, yog txoj kev siv feem ntau. Siv cov roj tiv thaiv tsim nyog (xws li Ar + CO₂ sib tov) thiab vuam hlau tuaj yeem ua tiav cov vuam zoo.
Kev Taw Qhia Arc Vuam: tuaj yeem siv tau, tab sis nws tsim tawm ntau dua thiab yuav tsum tau xaiv cov khoom siv hluav taws xob tsim nyog.
Tungsten Inert Gas (TIG) Vuam: Muab cov khoom siv vuam zoo tshaj plaws, tab sis nws kuj yuav tsum tau ua kom zoo tshaj plaws ua ntej- vuam tu thiab kim dua.
Txheej txheem Parameter hloov:
Txo tam sim no: Muab piv rau cov hlau zoo tib yam ntawm tib lub thickness, qhov tam sim no yuav tsum raug txo los ntawm 10% -15% thaum vuam galvanized steel. Qhov no pab txo cov zinc hlawv tawm thiab evaporation.
Nce Vuam Ceev: Kev vuam ceev yuav txo tau cov cua sov tawm, yog li txo cov cua sov- thaj tsam cuam tshuam thiab tso cai rau zinc vapor ntau lub sij hawm kom dim.
Siv Short Arc Ua Haujlwm: Kev tuav lub voj voog luv luv yuav pab txhim kho lub arc thiab txo cov cua nkag.
4.Yuav ua li cas ntxiv dag zog rau ncej-weld kho thiab tiv thaiv?
Weld Ntxuav: Tom qab vuam, slag thiab spatter nyob ib ncig ntawm lub vuam yuav tsum tau muab tshem tawm.
Kev Tiv Thaiv Corrosion: Cov txheej txheem vuam ua rau cov galvanized txheej ntawm cov vuam thiab ib puag ncig, ua rau nws tsis muaj txiaj ntsig tiv thaiv corrosion. Cov cheeb tsam no yuav tsum tau rov qab- kho nrog tiv thaiv- kev ntsuas corrosion, xws li:
Txau nrog zinc- nplua nuj xim (txoj kev siv tau zoo tshaj plaws).
Siv cov coatings txias-dip galvanizing.
5.Yuav ua li cas kom muaj kev nyab xeeb?
Qhov cua: Vuam yuav tsum tau ua nyob rau hauv ib qho chaw zoo heev -ventilated ib puag ncig, nyiam dua siv lub zog hauv zos tso pa system (xws li cov fume extractor) kom tshem tawm cov pa taws los ntawm qhov chaw.
Kev tiv thaiv ua pa: Welders yuav tsum hnav plua plav thiab fume respirators tsim nyog.
Kev Tiv Thaiv Qhov Muag: Hnav lub ntsej muag vuam tsim nyog.
Cov khaub ncaws tiv thaiv: Hnav hluav taws- khaub ncaws thiab hnab looj tes tiv thaiv kom tsis txhob kub hnyiab thiab UV puas.