Xov xwm

Qhov muaj nyob ntawm zinc txheej tau coj qee qhov teeb meem rau kev vuam ntawm galvanized steel.Cov teeb meem tseem ceeb yog: qhov nce rhiab heev ntawm vuam kab nrib pleb thiab pores, zinc evaporation thiab pa luam yeeb, oxide slag suav nrog, thiab melting thiab puas ntawm zinc txheej.Ntawm lawv, vuam tawg, cua qhov thiab slag suav nrog yog cov teeb meem tseem ceeb,
Weldability
(1) Kev tawg
Thaum lub sij hawm welding, molten zinc ntab rau saum npoo ntawm lub pas dej molten los yog ntawm lub hauv paus ntawm lub vuam.Vim hais tias lub melting point ntawm zinc yog tsawg tshaj li ntawm cov hlau, cov hlau nyob rau hauv lub molten pas dej ua ke crystallizes ua ntej, thiab wavy zinc yuav infiltrate rau hauv nws nyob rau hauv lub grain ciam teb ntawm hlau, ua rau lub weakening ntawm intergranular bonding.Ntxiv mus, nws yog ib qho yooj yim los tsim intermetallic brittle tebchaw Fe3Zn10 thiab FeZn10 ntawm zinc thiab hlau, uas ntxiv txo cov plasticity ntawm weld hlau, yog li nws yog ib qho yooj yim rau tawg raws li ib tug ciam teb ntawm grain thiab cov kab nrib pleb nyob rau hauv cov nyhuv ntawm welding residual kev nyuaj siab.
Cov yam ntxwv cuam tshuam rau kev tawg yooj yim: ① Thickness ntawm zinc txheej: zinc txheej ntawm galvanized hlau yog nyias thiab tawg rhiab heev yog me me, thaum zinc txheej ntawm kub-dip galvanized steel yog tuab thiab tawg rhiab heev.② Workpiece thickness: lub thickness ntau dua, qhov ntau dua qhov vuam txwv kev ntxhov siab thiab ntau dua qhov tawg rhiab heev.③ Groove gap: qhov sib txawv
Loj dua, ntau dua tawg rhiab heev.④ Vuam txoj kev: qhov tawg rhiab heev yog me me thaum siv phau ntawv arc vuam, tab sis ntau dua thaum siv CO2 roj shielded vuam.
Cov txheej txheem los tiv thaiv cov kab nrib pleb: ① Ua ntej vuam, qhib V-shaped, Y-shaped lossis X-shaped zawj ntawm qhov vuam txoj hauj lwm ntawm cov ntawv galvanized, tshem tawm cov zinc txheej ze ntawm qhov zawj los ntawm oxyacetylene lossis xuab zeb blasting, thiab tswj qhov sib txawv tsis txhob yuav loj dhau, feem ntau txog 1.5mm.② Xaiv cov khoom siv vuam nrog cov ntsiab lus Si tsawg.Vuam hlau uas tsis tshua muaj Si cov ntsiab lus yuav tsum tau siv rau cov roj shielded vuam, thiab titanium hom thiab titanium-calcium hom vuam qws yuav tsum tau siv rau phau ntawv vuam.
(2) Stomata
Zinc txheej nyob ze ntawm qhov zawj yuav oxidize (daim ZnO) thiab evaporate nyob rau hauv qhov kev txiav txim ntawm arc tshav kub, thiab emit dawb pa luam yeeb thiab chav, yog li nws yog heev yooj yim mus ua pores nyob rau hauv lub weld.Qhov loj dua qhov vuam tam sim no, qhov hnyav dua qhov zinc evaporation yog thiab qhov porosity rhiab heev yog.Nws tsis yog yooj yim los tsim cov pores nyob rau hauv nruab nrab tam sim no ntau yam thaum siv titanium hom thiab titanium-calcium hom ci strips rau vuam.Txawm li cas los xij, thaum hom cellulose thiab qis hydrogen hom electrodes siv rau vuam, qhov pores yooj yim tshwm sim nyob rau hauv qis tam sim no thiab siab tam sim no.Tsis tas li ntawd, lub kaum sab xis electrode yuav tsum tau tswj tsis pub dhau 30 ° ~ 70 ° kom deb li deb tau.
(3) Zinc evaporation thiab pa taws
Thaum lub galvanized steel phaj yog welded los ntawm hluav taws xob arc vuam, zinc txheej nyob ze ntawm lub pas dej ua ke yog oxidized rau ZnO thiab evaporated nyob rau hauv qhov kev txiav txim ntawm arc tshav kub, tsim ib tug loj npaum li cas ntawm pa luam yeeb.Lub ntsiab tseem ceeb ntawm cov pa luam yeeb no yog ZnO, uas muaj cov txiaj ntsig zoo rau cov neeg ua haujlwm cov pa ua pa.Yog li ntawd, kev ntsuas cua zoo yuav tsum tau ua thaum vuam.Raws li tib lub vuam specification, cov pa luam yeeb uas ua los ntawm vuam nrog titanium oxide hom electrode yog tsawg, thaum cov pa luam yeeb tsim los ntawm vuam nrog tsawg hydrogen hom electrode yog loj.(4) Oxide suav nrog
Thaum cov vuam tam sim no me me, ZnO tsim nyob rau hauv cov txheej txheem cua sov tsis yooj yim rau kev khiav, uas yooj yim ua rau ZnO slag suav nrog.ZnO yog qhov ruaj khov thiab nws cov ntsiab lus melting yog 1800 ℃.Loj ZnO suav nrog muaj qhov cuam tshuam tsis zoo rau weld plasticity.Thaum siv cov titanium oxide electrode, ZnO yog zoo thiab sib npaug, uas tsis tshua muaj kev cuam tshuam rau plasticity thiab tensile lub zog.Thaum siv cellulose hom lossis hydrogen hom electrode, ZnO nyob rau hauv weld yog loj thiab ntau dua, thiab cov weld kev ua tau zoo tsis zoo.