Fabricating zinc-coated hlau nthuav tawm ib qho kev sib tw heev thoob plaws hauv kev tsim khoom. Vuam Galvanized Steel yog ua tau. Ua li ntawd yam tsis muaj cov txheej txheem tsim nyog, txawm li cas los xij, ua rau muaj kev cuam tshuam loj heev ntawm kev ncaj ncees thiab kev nyab xeeb ntawm tus neeg teb xov tooj. Welders ntsib cov khoom siv sib cuam tshuam no txhua hnub. Kev kho cov zinc-coated workpiece raws nraim li cov pa roj carbon monoxide yuav kwv yees ua rau kev kuaj xyuas tsis zoo. Nws kuj tseem ua rau muaj kev xeb sai, tsis muaj kev tiv thaiv nyob rau hauv Heat-Affected Zone (HAZ). Tsis tas li ntawd, kev hlawv zinc ua rau muaj kev phom sij heev hauv khw hauv pem teb. Toxic hlau fumes ua rau muaj kev lav phib xaub loj rau txhua qhov kev lag luam fabrication. Peb muab cov qauv qhia meej, ua pov thawj raws li kev tshuaj xyuas thaum twg thiab yuav ua li cas txhawm rau vuam cov ntaub ntawv no. Koj yuav kawm txog cov tswv yim los txo cov kev mob metallurgical loj thiab tiv thaiv koj pab neeg. Peb kuj tseem npog cov qauv kev ua raws cai nruj heev uas yuav tsum tau ua kom muaj kev tiv thaiv corrosion mus ntev hauv koj qhov kawg tsim.
Ntsiab Cai
Feasibility: Galvanized hlau tuaj yeem welded, yog tias zinc txheej raug tshem tawm tag nrho ntawm thaj chaw weld ua ntej tawm tsam arc.
Kev Tiv Thaiv Kev Tiv Thaiv Tsis Zoo: Kev ua tsis tiav ntawm cov zinc ua rau muaj qhov sib txawv ntawm qhov porosity loj, suav nrog, thiab kev sib tsoo ntawm qhov sib txawv vim qhov sib txawv loj ntawm cov ntsiab lus melting ntawm zinc thiab hlau.
Kev Nyab Xeeb Tseem Ceeb: Vaporized zinc tsim cov pa phem heev. Kev tsim nyog PPE thiab tso pa tawm yog qhov kev cai lij choj thiab kev noj qab haus huv uas tsis tuaj yeem sib tham.
Post-Weld Ua raws: Vuam rhuav tshem cov zinc txheej tiv thaiv; Kev ua tiav tiav yuav tsum tau rov qab kho dua tom qab vuam nruj raws li ASTM A 780 tus qauv.
Lub Metallurgical Reality ntawm Vuam Galvanized Steel
Kev nkag siab txog physics ntawm kev ua tsis tiav tsim lub hauv paus ntawm kev nyab xeeb fabrication. Zinc boils thiab vaporizes ntawm kwv yees li 420 ° C (900 ° F). Hlau, hloov pauv, yaj ntawm ib ncig ntawm 1500 ° C (2700 ° F). Qhov sib txawv ntawm qhov kub thiab txias no ua rau muaj kev sib tw tseem ceeb hauv engineering. Koj tsuas tuaj yeem yaj ob qho tib si hlau ib txhij nyob rau hauv ib qho chaw ruaj khov.
Yog hais tias welded ncaj qha, zinc vaporizes instantly nyob rau hauv lub arc. Nws nkag mus rau hauv lub molten steel puddle raws li lub pas dej ua ke sai sai. Cov roj uas raug kaw no ua rau muaj qhov porosity. Nws kuj tsim kev koom nrog thiab tsis muaj kev txaus ntshai ntawm fusion. Ib lub vuam uas muaj cov hnab ntim roj tsis tuaj yeem nqa cov khoom hnyav.
Cov ntaub ntawv kev lag luam qhia tau hais tias txoj hauv kev meej rau pem hauv ntej rau kev ua haujlwm ncaj ncees. Thaum npaj kom zoo los ntawm kev tshem tawm cov zinc tag nrho, lub zog qaug zog tseem nyob twj ywm. Lub pob txha toughness ntawm qhov huv si yog zoo tib yam rau cov hlau tsis muaj coated. Koj tsis poob qhov kev ua haujlwm zoo yog tias koj ua raws li cov txheej txheem npaj nruj.
Zinc penetration cracking tseem yog ib qho kev pheej hmoo loj heev thaum tsim khoom. Cov kua zinc tuaj yeem nkag mus rau hauv cov ciam teb ntawm cov hlau hnyav. Peb tawm tsam qhov teeb meem engineering tshwj xeeb los ntawm kev siv cov khoom siv hluav taws xob tsawg lossis rutile electrodes. Khaws cov ntsiab lus silicon qis dua 0.2 Si kom txo cov kev pheej hmoo tawg no kom zoo.
Cov khoom siv |
Weld Porosity Risk |
Cracking Risk Factor |
Ua kom muaj kev ncaj ncees |
Cov pa roj carbon steel |
Tsawg |
Tsawg |
Lub hauv paus Standard |
Tsis tau npaj zinc txheej |
Siab heev |
Siab (Zinc Penetration) |
Muaj kev cuam tshuam loj heev |
Tsim nyog Stripped Joint |
Tsawg |
Tsawg (siv <0.2 Si Electrode) |
Zoo tib yam rau Baseline |
Tsis-Tshaj Tawm Kev Noj Qab Haus Huv, Kev Nyab Xeeb, thiab Kev Ua Raws Cai
Inhaling zinc oxide fumes qhia mob, muaj kev pheej hmoo mob nkeeg tam sim ntawd. Cov neeg ua haujlwm raug vaporized zinc nquag tsim Metal Fume Fever. Lawv ntsib cov tsos mob hnyav, zoo li mob khaub thuas sai tom qab kis tau. Cov tsos mob no muaj xws li xeev siab, ua daus no, kub taub hau, thiab mob hnyav. Cov kev mob tshwm sim tam sim no ua rau muaj kev ua haujlwm tsis zoo thiab ua rau muaj kev lav phib xaub hauv chaw ua haujlwm hnyav.
Hmoov tsis zoo, ntau lub khw tseem cia siab rau qhov chaw ua haujlwm txaus ntshai myths xwb. Qee cov kws ua lag luam ntseeg tias haus cov mis nyuj tiv thaiv hnyav hlau lom. Peb yuav tsum hais thiab tso tseg tam sim no cov lus xaiv txaus ntshai khw-pem teb. Mis nyuj tsis npog lub ntsws los yog tso tseg hlau nqus hauv txhua lub peev xwm. Tsis muaj ib qho kev noj zaub mov zoo rau kev tswj xyuas engineering.
Yuav tsum muaj kev ruaj ntseg hauv paus tiv thaiv koj cov neeg ua haujlwm los ntawm kev puas tsuaj mus tas li. Koj yuav tsum ua raws li kev tiv thaiv kev ua pa thiab kev tiv thaiv ib puag ncig.
Txhim kho qhov chaw ua haujlwm-catchure ventilation systems kom tshem tawm cov pa tawm ntawm qhov chaw ua pa.
Siv qhov chaw qhib huab cua los yog hla qhov cua nkag mus qhov twg los tau.
Mandate P100 (HEPA) ib nrab-qhov ncauj qhov ntswg los lim cov teeb meem phom sij zoo.
Siv Powered Air-Purifying Respirators (PAPR) rau txhua tus neeg ua haujlwm ua haujlwm hauv qhov chaw kaw.
Pre-Weld Surface Preparation: Qhov Kev Txiav Txim Siab rau Kev Ua Zoo
AWS D-19.0 cov qauv muab cov txheej txheem tswj hwm nruj rau kev npaj. Lawv hais kom tshem cov zinc txheej 1 mus rau 4 ntiv tes (2.5 mus rau 10 cm) deb ntawm thaj tsam weld. Koj yuav tsum ua qhov kev tshem tawm ntawm ob sab ntawm qhov sib koom ua ntej tawm tsam arc. Hla cov kauj ruam no lav qhov kev soj ntsuam ua tsis tiav.
Ntau tus fabricators tag nrho saib xyuas qhov yuav tsum tau ntxuav lub nraub qaum ntawm kev sib koom tes. Peb hu qhov no qhov kev hem thawj zais. Thaum tshav kub kub hloov sai sai vaporizes rear-sab zinc thaum lub sij hawm vuam txheej txheem. Qhov kev ua thermal capillary no rub cov pa roj thiab cov pa paug ncaj qha mus rau hauv lub hauv paus ntawm lub vuam. Koj yuav tsum ntxuav txhua sab uas raug tshav kub.
Cov neeg ua haujlwm feem ntau xaiv ntawm kev tshem tawm cov tshuab thiab tshuaj lom neeg.
Kev tshem tawm txhua yam: Qhov no sawv cev rau kev lag luam kev coj ua zoo tshaj plaws rau ntau lub khw. Siv tawv sib tsoo discs lossis abrasive nrov plig plawg lub log kom ua tiav qhov ci, liab qab hlau. Xyuas kom koj tshem tawm tag nrho cov txheej zinc alloyed, tsis yog qhov dull nto.
Kev tshem tawm tshuaj lom neeg: Koj tuaj yeem siv muriatic acid rau kev tshem tawm tshuaj lom neeg hauv ib puag ncig tshwj xeeb. Txawm li cas los xij, txoj kev no xav tau cov tshuaj muaj tseeb tiag. Koj yuav tsum aggressively neutralize cov kua qaub siv baking soda. Thaum kawg, qhuav cov hlau kom huv si kom tsis txhob muaj kev puas tsuaj hydrogen embrittlement.
Xaiv Txoj Kev Vuam Txoj Cai thiab Cov Txheej Txheem
Cov ntawv thov sib txawv yuav tsum tau xaiv cov txheej txheem tshwj xeeb. Tailoring koj txoj hauv kev tiv thaiv kev tawg ntau dhau thiab ua kom muaj kev nkag mus tob.
MIG Welding (GMAW) ua raws li qhov kev xaiv zoo tshaj plaws rau cov ntaub ntawv thinner xws li a galvanized steel ntawv . Cov kev hloov pauv tshwj xeeb yog qhov tsim nyog ntawm no. Cov neeg ua haujlwm xav tau kev mus ncig qis dua me ntsis dua li lawv siv rau cov hlau liab qab. Kev qeeb qeeb cia cov zinc residual hlawv tawm ua ntej ntawm lub pas dej. Kev nce qhov voltage pab punch los ntawm ib qho me me ntawm cov zinc seem ntawm qhov chaw. Siv Argon / CO2 roj sib tov kom ruaj khov ntawm arc thiab radically txo ya spatter.
Stick Welding (SMAW) tseem yog txoj kev nyiam rau cov khoom siv tuab. Cov txheej txheem hloov pauv yog qhov tseem ceeb rau kev ua tiav. Cov neeg ua haujlwm yuav tsum txhob txwm txo lawv txoj kev mus los. Lawv yuav tsum hloov lub kaum sab xis ntawm electrode mus rau kwv yees li 30 degrees. Siv lub suab nrov 'whipping action' thawb vaporizing zinc rau pem hauv ntej thiab tawm ntawm txoj kev vuam. E7018 low-hydrogen electrodes ua tus qauv xaiv rau daim ntawv thov hnyav no.
TIG Welding (GTAW) nthuav qhia cov teeb meem kev ua haujlwm loj. Peb cuam tshuam txoj kev no rau cov khoom kho. Cov txheej txheem GTAW yog qhov tseem ceeb heev rau kev sib kis sab nraud. Vaporized zinc yuav tam sim ntawd rhuav tshem cov tungsten electrode. Nws ruins lub gas shield thiab tawm ib tug heev kis kab mob.
Vuam txheej txheem |
Zuag qhia tag nrho Suitability |
Optimal Khoom Profile |
Kev hloov pauv tseem ceeb |
MIG (GMAW) |
Siab |
Nyias Sheet Hlau |
Tsawg ceev, siab dua voltage, Argon / CO2 mix |
Stick (SMAW) |
Siab |
Thick Structural Steel |
30-degree lub kaum sab xis, whipping nkaus, E7018 electrode |
TIG (GTAW) |
Tsawg heev |
Tsis pom zoo |
Kev poob siab heev vim muaj cov kab mob tungsten ceev |
Tom qab Weld Restoration thiab Lifecycle Defense
Cov cua kub hnyav mus tas li strips cov khoom tiv thaiv corrosive los ntawm cov hlau ib puag ncig. Peb hu qhov no qhov teeb meem Heat-Affected Zone (HAZ). Qhov kev puas tsuaj thermal no tawm ntawm thaj chaw tshiab tuaj koom tam sim ntawd yooj yim rau xeb. Tsis muaj kev cuam tshuam, galvanic cell forms. Lub xovtooj ntawm no nrawm nrawm rau qhov degradation ntawm ib puag ncig liab qab.
Koj yuav tsum tau piav qhia txog tus txheej txheem ua haujlwm rau kev kho qhov sib koom ua ke. Kev nruj nruj raws li ASTM A 780 tiv thaiv oxidation ntxov ntxov. Ua raws li cov lus qhia no ua kom lub rooj sib txoos ncav cuag nws lub neej tsim.
Cov qauv kev lag luam lees paub ntau txoj hauv kev kho kom zoo.
Siv cov xim tshwj xeeb zinc-nplua nuj rau cov hlau liab qab. Cov txheej txheem kev lag luam no yuav tsum muaj tsawg kawg 95% cov zinc ntshiab hauv cov yeeb yaj kiab qhuav.
Siv zinc-raws li soldering alloys kom yaj ib qho kev tiv thaiv tshiab ntawm cov hlau liab qab.
Thermal spraying, tseem hu ua metallizing, rau kev lag luam hnyav thiab kev lag luam siv.
Tswj cov neeg tau txais kev cia siab thaum ntxov hauv kev tsim khoom. Cov chaw kho yuav pib qhia qhov txawv xim zoo nkauj tsis sib haum. Lawv feem ntau saib cov nyiaj ci ntsa iab tiv thaiv lub ntsej muag duller grey tom qab. Lawv yuav ib txwm huab cua thiab oxidize kom phim cov khoom qub dhau sijhawm.
Kev ntsuas Fabrication Alternatives rau ROI zoo dua
Sib tsoo, tshwj xeeb vuam, thiab tom qab vuam kov-ups qhia cov nqi zog loj. Lawv kuj tsim kev ntxhov siab ua haujlwm tsis muaj zog. Cov tswv lag luam yuav tsum ntsuam xyuas yog tias vuam ua ntej-coated hlau ua rau kev txiav txim siab nyiaj txiag. Qee zaum, lwm txoj hauv kev tau txais txiaj ntsig ntau dua Rov Qab Los ntawm Kev Lag Luam.
Rau kev tsim khoom hnyav, ua tib zoo ntsuas ROI ntawm cov txheej txheem sequencing. Xav txog kev tsim koj cov rooj sib txoos nkaus nrog raw, tsis muaj hlau ua ntej. Tom qab ntawd koj tuaj yeem xa cov tiav, tag nrho welded los ua ke rau kub-dip galvanizing. Cov kab ke no tshem tawm kev sib tsoo, nres cov pa phem, thiab muab lub plhaub tiv thaiv txuas ntxiv.
Xav txog engineering pob qij txha rau mechanical bolted kev sib txuas es tsis yog welds. Lwm txoj hauv kev no tshem tawm cov pa phem zinc los ntawm koj lub khw hauv pem teb. Nws kuj tshem tawm qhov xav tau ntawm HAZ kho dua tshiab thiab cov cuab yeej ua pa kim.
High-volume manufacturing yam tsis muaj cov qauv vuam yuav tsum tau txais txiaj ntsig los ntawm cov khoom siv raw khoom ntse dua. Kev xa khoom tas mus li galvanized steel kauj rau yob txoj kev los yog stamping feem ntau ua pov thawj zoo heev. Daim-ib txheej txheej khib nyiab loj heev lub sijhawm thiab nyiaj txiag thaum raw coil ua tau raws li koj cov lus qhia meej. Stamping pre-coated coils dramatically accelerates cov sij hawm ntau lawm.
Xaus
Fabricating zinc-coated steel yuav tsum muaj kev qhuab ntuas, kev ua haujlwm zoo heev. Vuam cov ntaub ntawv no yog ib qho kev nyab xeeb thiab kev ua haujlwm zoo tsuas yog thaum koj ua raws li kev npaj saum npoo nruj. Koj yuav tsum tau ua raws li cov kev cai welding tsis zoo thiab ua raws li kev kho tom qab vuam. Kev siv cov shortcuts nrog kev npaj kwv yees ua rau muaj kev cuam tshuam rau ob qho khoom kawg thiab koj cov neeg ua haujlwm noj qab haus huv.
Cov neeg txiav txim siab yuav tsum ua tam sim ntawd, ua raws li cov kauj ruam tom ntej. Peb pom zoo kom tshuaj xyuas koj lub khw hauv pem teb SOPs tam sim no txhawm rau ua kom nruj raws li AWS thiab ASTM cov qauv. Tshawb xyuas koj cov khoom PPE niaj hnub no kom paub tseeb tias koj muaj P100 cov lim dej txaus thiab cov tshuab ua pa. Thaum kawg, khiav cov ncauj lus kom ntxaws txog cov txiaj ntsig kev txheeb xyuas piv rau pre-galvanizing workflows tiv thaiv tom qab galvanizing workflows. Kev ua kom zoo tshaj qhov ntu ntu no yuav ua rau koj qhov kev ua haujlwm zoo tshaj plaws thiab tiv thaiv koj cov kab hauv qab.
FAQ
Q: Koj puas tuaj yeem muab cov hlau me me rau galvanized steel?
A: Yog, tab sis cov galvanized workpiece tseem yuav tsum tau stripped rov qab mus rau liab qab me ntsis hlau ntawm qhov chaw txuas. Cov qhov khoob me me yuav tsum tau sab laug kom tso cai rau cov roj zinc residual los ntawm HAZ kom dim yam tsis muaj qhov porosity.
Q: Nws puas muaj kev nyab xeeb rau vuam galvanized hlau sab nraud?
A: Sab nraum zoov vuam dastically txhim kho qhov cua tab sis tsis tshem tawm qhov txaus ntshai. Cov neeg ua haujlwm tseem yuav tsum hnav P100-rated respirators thiab zom cov zinc.
Q: Yuav ua li cas yog tias kuv welded tshaj zinc tsis sib tsoo nws?
A: Lub weld yuav raug kev txom nyem los ntawm qhov porosity loj (kua npuas npuas) thiab tsis muaj fusion, ua rau nws cov qauv tsis zoo thiab ua rau tsis ua hauj lwm hauv kev thauj khoom.
