Stainless hlau tsis tas yuav nyuaj rau tshuab, tab sis nws yuav tsum tau tshwj xeeb saib xyuas kom meej thaum vuam.

Stainless hlau tsis tas yuav nyuaj rau tshuab, tab sis nws yuav tsum tau tshwj xeeb saib xyuas kom meej thaum vuam.Nws tsis dissipate cua sov li me me hlau los yog txhuas thiab poob ib co ntawm nws corrosion kuj yog hais tias nws kub heev.Cov kev coj ua zoo tshaj plaws pab tswj nws txoj kev tiv thaiv corrosion.Duab: Miller Electric
Kev tiv thaiv corrosion ntawm stainless hlau ua rau nws yog ib qho kev xaiv zoo nkauj rau ntau qhov tseem ceeb piping daim ntaub ntawv, nrog rau siab purity zaub mov thiab dej haus, tshuaj, siab hlab ntsha thiab petrochemicals.Txawm li cas los xij, cov khoom siv no tsis cuam tshuam cov cua sov zoo li cov hlau me me los yog txhuas, thiab cov txheej txheem vuam tsis zoo tuaj yeem txo nws cov corrosion kuj.Kev siv cov cua sov ntau dhau thiab siv cov hlau tsis raug yog ob qho txhaum cai.
Ua raws li qee qhov zoo tshaj plaws stainless hlau welding kev coj ua tuaj yeem pab txhim kho cov txiaj ntsig thiab xyuas kom cov hlau muaj kev tiv thaiv corrosion.Tsis tas li ntawd, kev txhim kho cov txheej txheem vuam tuaj yeem ua kom cov khoom tsim tau yam tsis muaj kev txi zoo.
Thaum vuam stainless hlau, kev xaiv ntawm cov hlau muab tub lim yog qhov tseem ceeb rau kev tswj cov ntsiab lus carbon.Cov hlau muab tub lim siv los vuam stainless hlau yeeb nkab yuav tsum txhim kho qhov kev ua haujlwm vuam thiab ua tau raws li qhov yuav tsum tau ua.
Saib rau "L" xaiv cov khoom siv hlau xws li ER308L raws li lawv muab cov ntsiab lus qis tshaj plaws uas pab tswj kev tiv thaiv corrosion nyob rau hauv qis carbon stainless hlau alloys.Vuam cov ntaub ntawv tsis tshua muaj carbon nrog cov txheej txheem muab tub lim ua rau cov ntsiab lus carbon ntawm vuam thiab yog li ua rau muaj kev pheej hmoo ntawm corrosion.Tsis txhob "H" muab tub lim hlau vim tias lawv muaj cov ntsiab lus carbon ntau dua thiab yog npaj rau cov ntawv thov kom muaj zog dua ntawm qhov kub siab.
Thaum welding stainless hlau, nws tseem ceeb heev uas yuav tau xaiv ib tug muab tub lim hlau uas tsis tshua muaj kab (tseem hu ua junk).Cov no yog cov khoom seem los ntawm cov khoom siv raw siv los ua cov hlau nplaum thiab suav nrog antimony, arsenic, phosphorus thiab sulfur.Lawv tuaj yeem cuam tshuam qhov corrosion kuj ntawm cov khoom.
Vim tias cov hlau tsis muaj hlau tsis zoo rau cov khoom siv hluav taws xob, kev sib koom ua ke thiab kev sib dhos kom zoo ua lub luag haujlwm tseem ceeb hauv kev tswj cov cua sov kom tswj cov khoom siv.Qhov khoob ntawm qhov chaw lossis qhov tsis sib xws yuav tsum tau lub teeb kom nyob twj ywm hauv ib qho chaw ntev dua, thiab cov hlau muab tub lim ntau dua yuav tsum tau ntim cov qhov khoob.Qhov no ua rau cov cua sov tsim nyob rau hauv qhov chaw cuam tshuam, ua rau cov khoom tiv thaiv overheat.Kev teeb tsa tsis raug kuj tuaj yeem ua rau nws nyuaj rau kaw qhov khoob thiab ua tiav qhov kev nkag mus ntawm qhov vuam yuav tsum tau ua.Peb tau ua kom paub tseeb tias cov khoom tuaj ze li ntawm cov hlau tsis muaj steel li sai tau.
Lub purity ntawm cov khoom no kuj tseem ceeb heev.Txawm tias qhov tsawg tshaj plaws ntawm cov kab mob los yog cov av hauv qhov vuam tuaj yeem ua rau muaj qhov tsis xws luag uas txo lub zog thiab corrosion kuj ntawm cov khoom kawg.Txhawm rau ntxuav lub hauv paus hlau ua ntej vuam, siv txhuam tshwj xeeb rau cov hlau tsis muaj steel uas tsis tau siv rau cov hlau los yog txhuas.
Nyob rau hauv stainless hlau, rhiab heev yog lub ntsiab ua rau poob ntawm corrosion kuj.Qhov no tshwm sim thaum qhov kub thiab txias ntawm qhov vuam hloov pauv ntau dhau, ua rau muaj kev hloov pauv hauv microstructure ntawm cov khoom.
Qhov no sab nraud weld ntawm stainless hlau yeeb nkab tau welded nrog GMAW thiab tswj hlau tshuaj tsuag (RMD) thiab lub hauv paus weld tsis backflushed thiab zoo ib yam li cov tsos thiab zoo rau GTAW backflush vuam.
Ib feem tseem ceeb ntawm kev tiv thaiv corrosion ntawm stainless hlau yog chromium oxide.Tab sis yog tias cov ntsiab lus ntawm cov pa roj carbon monoxide siab dhau lawm, chromium carbides raug tsim.Lawv khi chromium thiab tiv thaiv kev tsim ntawm qhov tsim nyog chromium oxide, uas ua rau cov hlau tsis muaj zog tiv thaiv corrosion.Yog tsis muaj chromium oxide txaus, cov khoom siv yuav tsis muaj qhov xav tau thiab corrosion yuav tshwm sim.
Kev tiv thaiv ntawm rhiab heev los ntawm kev muab tub lim hlau xaiv thiab tswj cov cua sov nkag.Raws li tau hais ua ntej, nws yog ib qho tseem ceeb uas yuav tau xaiv cov hlau muab tub lim nrog cov ntsiab lus qis carbon thaum vuam stainless hlau.Txawm li cas los xij, qee zaum carbon yog xav tau los muab lub zog rau qee yam kev siv.Kev tswj cua sov yog qhov tseem ceeb tshwj xeeb tshaj yog thaum cov hlau tsis muaj cov pa roj carbon tsawg tsis haum.
Txo lub sij hawm uas cov vuam thiab HAZ yog qhov kub thiab txias, feem ntau 950 txog 1500 degrees Fahrenheit (500 txog 800 degrees Celsius).Lub sij hawm tsawg koj siv soldering nyob rau hauv no ntau, qhov tsawg tshav kub koj yuav tsim.Nco ntsoov xyuas thiab saib xyuas qhov kub ntawm qhov sib cuam tshuam hauv cov txheej txheem vuam siv.
Lwm qhov kev xaiv yog siv cov hlau muab tub lim nrog cov khoom siv alloying xws li titanium thiab niobium los tiv thaiv kev tsim ntawm chromium carbides.Vim tias cov khoom no tseem cuam tshuam rau lub zog thiab tawv, cov hlau muab tub lim no tsis tuaj yeem siv rau hauv txhua daim ntawv thov.
Hauv paus hla vuam siv cov pa roj tungsten arc vuam (GTAW) yog ib txoj hauv kev rau vuam stainless hlau kav.Qhov no feem ntau yuav tsum muaj argon backflush los tiv thaiv oxidation ntawm lub hauv qab ntawm lub vuam.Txawm li cas los xij, rau cov kav hlau tsis muaj steel hlau thiab cov kav dej, kev siv cov txheej txheem vuam hlau tau dhau los ua ntau dua.Nyob rau hauv cov ntaub ntawv no, nws yog ib qho tseem ceeb kom to taub yuav ua li cas sib txawv shielding gases cuam tshuam rau corrosion kuj ntawm cov khoom.
Gas arc vuam (GMAW) ntawm stainless hlau ib txwm siv argon thiab carbon dioxide, sib tov ntawm argon thiab oxygen, los yog ib tug peb-gas sib tov (helium, argon thiab carbon dioxide).Feem ntau, cov kev sib xyaw no feem ntau yog argon lossis helium nrog tsawg dua 5% carbon dioxide, vim tias cov pa roj carbon dioxide tuaj yeem qhia cov pa roj carbon monoxide rau hauv cov da dej molten thiab ua rau muaj kev pheej hmoo ntawm rhiab heev.Ntshiab argon tsis pom zoo rau GMAW stainless hlau.
Cored hlau rau stainless hlau yog tsim los siv nrog ib txwm sib tov ntawm 75% argon thiab 25% carbon dioxide.Fluxes muaj cov khoom xyaw tsim los tiv thaiv kev kis kab mob ntawm cov vuam los ntawm cov pa roj carbon monoxide los ntawm kev tiv thaiv roj.
Raws li cov txheej txheem GMAW hloov zuj zus, lawv ua kom yooj yim rau vuam cov kav thiab cov kav hlau tsis muaj steel.Txawm hais tias qee daim ntawv thov tseem yuav xav tau cov txheej txheem GTAW, kev ua cov hlau ua tau zoo tuaj yeem muab cov khoom zoo sib xws thiab ntau dua hauv ntau daim ntawv thov stainless hlau.
ID stainless hlau welds ua nrog GMAW RMD zoo ib yam thiab zoo li tus coj OD welds.
Hauv paus dhau los siv cov txheej txheem luv luv GMAW xws li Miller's controlled metal deposition (RMD) tshem tawm cov backflushing hauv qee cov ntawv thov austenitic stainless hlau.RMD cov hauv paus hla tuaj yeem ua raws li pulsed GMAW lossis flux-cored arc vuam los sau thiab kaw qhov hla, ib qho kev xaiv uas txuag sijhawm thiab nyiaj txiag piv rau backflush GTAW, tshwj xeeb tshaj yog nyob rau hauv cov kav dej loj.
RMD siv cov kev tswj xyuas luv luv ntawm cov hlau xa mus los tsim kom muaj qhov chaw nyob ntsiag to, ruaj khov arc thiab vuam pas dej ua ke.Qhov no yuav txo tau lub caij nyoog ntawm txias laps los yog non-fusion, txo spatter thiab txhim kho cov yeeb nkab hauv paus zoo.Precisely tswj hlau hloov lwm lub tsev kuj ua kom zoo ib yam droplet deposition thiab yooj yim tswj ntawm lub vuam pas dej ua ke, yog li tswj cov cua sov input thiab vuam ceev.
Cov txheej txheem tsis yog ib txwm muaj tuaj yeem txhim kho cov khoom siv vuam.Vuam ceev tuaj yeem sib txawv ntawm 6 txog 12 ipm thaum siv RMD.Vim tias cov txheej txheem no txhim kho kev ua tau zoo yam tsis muaj cua sov ntxiv ntawm ib feem, nws pab tswj kev ua haujlwm thiab kev tiv thaiv corrosion ntawm stainless hlau.Txo cov cua kub nkag ntawm cov txheej txheem kuj pab tswj substrate deformation.
Cov txheej txheem GMAW pulsed no muaj luv luv arc ntev, nqaim arc cones, thiab cov cua kub tsawg dua li cov pa dav hlau pulsed.Txij li thaum cov txheej txheem raug kaw, arc drift thiab kev hloov pauv hauv qhov kev ncua deb ntawm lub taub mus rau qhov chaw ua haujlwm tau raug tshem tawm zoo.Qhov no ua kom yooj yim rau kev tswj ntawm lub pas dej welding ob qho tib si thaum vuam ntawm qhov chaw thiab thaum vuam sab nraum qhov chaw ua haujlwm.Thaum kawg, kev sib xyaw ua ke ntawm cov mem tes GMAW rau kev sau thiab kaw hla nrog RMD rau cov hauv paus hla cia cov txheej txheem vuam ua tiav nrog ib lub xaim thiab ib qho roj, txo cov txheej txheem hloov sijhawm.
Tube & Pipe Journal tau tsim tawm hauv xyoo 1990 ua thawj phau ntawv xov xwm tshwj xeeb rau kev lag luam yeeb nkab hlau.Niaj hnub no, nws tseem tsuas yog kev lag luam luam tawm hauv North America thiab tau dhau los ua cov ntaub ntawv ntseeg siab tshaj plaws rau cov kws tshaj lij tubing.
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