1.Dab tsi yog "dawb xeb"?
Dawb xeb yog cov khoom siv corrosion ntawm zinc nyob rau saum npoo ntawm galvanized txheej, thiab nws cov khoom tseem ceeb yog zinc carbonate lossis zinc hydroxide. Nws feem ntau yog tsim thaum galvanized coils raug cov av noo, qhov cua tsis zoo (xws li raug los nag los yog soaked hauv condensation), ua rau zinc hnov mob nrog oxygen thiab noo noo.
2.Dab tsi yog qhov tshwj xeeb ntawm cov xeb dawb ntawm vuam zoo?
Porosity
Qhov no yog qhov teeb meem tseem ceeb tshaj plaws thiab feem ntau. Cov xeb dawb (ib qho sib xyaw ntawm cov khoom ya raws thiab corrosion) sai sai decomposes thaum sib cuag nrog lub siab kub ntawm lub vuam arc, ua rau cov dej vapor ntau (H₂O) thiab carbon dioxide (CO₂).
Cov pa roj no tsis tuaj yeem khiav tawm ua ntej lub pas dej molten solidifies thiab ua rau hauv cov hlau vuam, tsim ntau qhov hws.
Kev puas tsuaj: Porosity ua rau txo qhov zoo ntawm tus ntoo khaub lig- ntu ntu ntawm qhov vuam, ua rau muaj qhov txo qis hauv cov khoom siv kho tshuab (xws li lub zog, tawv, thiab qaug zog), dhau los ua qhov muaj peev xwm pib tawg.
Nce Weld Spatter
Lub xub ntiag ntawm cov xeb dawb cuam tshuam qhov kev ruaj ntseg ntawm lub arc thiab ua rau cov hlau molten tsis zoo thaum lub sij hawm hloov.
Qhov no ua rau muaj kev sib tsoo loj heev, nkim cov khoom siv vuam, ua rau cov khoom ua haujlwm tsis zoo, thiab ua rau cov khoom ua haujlwm ntau dua ntawm kev ua haujlwm tom qab- vuam vuam.
Tsis txaus Fusion thiab nkag mus
Cov txheej xeb dawb ua raws li "barrier" rau saum npoo ntawm lub hauv paus hlau yuav tsum tau welded. Lub zog arc yog thawj zaug siv rau ntawm cov kab mob no, tsis yog siv ncaj qha los yaj lub hauv paus hlau.
Qhov no tuaj yeem ua rau muaj kev nkag mus tsis txaus, txhais tau hais tias lub vuam seam tsis tuaj yeem nkag mus rau qhov tob uas yuav tsum tau ua, lossis txawm tias ua rau tsis tiav fusion tsis xws luag, ua rau lub vuam sib txuas tsis muaj zog.
3.Yuav ua li cas los ntxuav galvanized coils nrog xeb dawb?
Cov cuab yeej: Siv lub kaum sab xis grinder nrog cov hlau txhuam, sib tsoo lub log, los yog louvered hniav.
Scope: Qhov chaw tu yuav tsum dav dua qhov chaw weld; Feem ntau, cov hlau ci ntsa iab yuav tsum raug nthuav tawm hauv 20-30 hli ntawm txhua sab ntawm qhov vuam.
Lus Cim: Tom qab ntxuav, nws yog qhov zoo tshaj plaws los tshuab cov plua plav nrog cov cua compressed.
4.Yuav ua li cas ntxuav cov tshuaj?
Cov tshuaj zinc plating tshwj xeeb lossis cov kua qaub diluted (xws li hydrochloric acid) tuaj yeem siv los yaj cov xeb dawb thiab cov zinc txheej.
Disadvantages: Cov txheej txheem yog cumbersome, muaj tshuaj lom neeg txaus ntshai, thiab yuav tsum tau kom huv si yaug thiab ziab ntawm cov tshuaj ua ntej welding; txwv tsis pub, residues tuaj yeem qhia cov teeb meem tshiab. Nws tsis tshua muaj siv rau kev kho ua ntej- vuam hauv kev tsim khoom.
5.Yuav ua li cas cov txheej txheem vuam yuav raug kho?
Ua kom cov khoom siv tam sim no / cua sov kom tsim nyog: Vim tias zinc qhov kub kub (907 ° C) qis dua cov hlau melting point (kwv yees li 1500 ° C), zinc txheej yuav vaporize ua ntej nyob rau hauv qhov kev txiav txim ntawm arc, siv qee lub zog. Tsim nyog ua kom sov tuaj yeem ua kom txaus nkag mus rau hauv cov khoom siv hauv paus.
Me ntsis txo vuam ceev: Muab cov roj ntau lub sij hawm kom khiav tawm ntawm lub pas dej ua ke yuav pab txo qhov porosity.
Siv cov txheej txheem vuam tsim nyog: Piv txwv li, hauv cov hlau thaiv hlau arc vuam (SMAW), siv cov arc luv thiab ncaj electrode txav; nyob rau hauv gas shielded welding (GSAW), ib tug me ntsis siab dua roj ntws tus nqi thiab ib tug laub- txheej txheem rub yuav siv tau.