Stainless hlau tsis tas yuav nyuaj rau kev ua haujlwm nrog, tab sis nws cov vuam yuav tsum tau ua tib zoo saib xyuas kom meej.Nws tsis dissipate tshav kub zoo li me me hlau los yog txhuas thiab tej zaum yuav poob ib co corrosion kuj yog tias koj kub nws 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 cov yeeb nkab tseem ceeb, nrog rau cov khoom noj khoom haus thiab dej haus siab, tshuaj, siab hlab ntsha thiab kev siv petrochemical.Txawm li cas los xij, cov khoom siv no tsis cuam tshuam cov cua sov xws li cov hlau me me lossis txhuas, thiab cov 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.Filler hlau siv los vuam stainless hlau yeeb nkab yuav tsum txhim kho vuam kev ua tau zoo thiab tsim nyog rau daim ntawv thov.
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 hlau tsis tshua muaj carbon hlau nrog cov txheej txheem muab tub lim ua rau cov ntsiab lus carbon ntawm qhov sib koom ua ke, ua rau muaj kev pheej hmoo ntawm corrosion.Tsis txhob muab cov hlau ua cim "H" vim tias lawv muab 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 muaj kab (tseem hu ua impurities) ntawm lub ntsiab.Cov no yog cov khoom seem hauv cov khoom siv raw siv los ua cov hlau, suav nrog antimony, arsenic, phosphorus thiab sulfur.Lawv tuaj yeem cuam tshuam rau 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 tuaj yeem ua rau muaj cua sov los tsim nyob rau hauv qhov chaw cuam tshuam, uas tuaj yeem ua rau ib feem ntawm overheat.Ib qho tsis zoo kuj tuaj yeem ua rau nws nyuaj rau txuas qhov sib txawv thiab tau txais qhov kev nkag mus rau qhov yuav tsum tau ua ntawm vuam.Saib xyuas kom phim cov khoom rau stainless hlau kom ze li sai tau.
Lub purity ntawm cov khoom no kuj tseem ceeb heev.Tsawg heev ntawm cov kab mob los yog av hauv cov pob qij txha welded tuaj yeem ua rau muaj qhov tsis xws luag uas txo lub zog thiab corrosion kuj ntawm cov khoom kawg.Txhawm rau ntxuav lub substrate ua ntej vuam, siv cov txhuam tshwj xeeb stainless hlau uas tsis tau siv rau ntawm cov hlau los yog txhuas.
Nyob rau hauv stainless hlau, rhiab heev yog lub ntsiab ua rau poob ntawm corrosion kuj.Qhov no tuaj yeem 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, welded siv GMAW thiab tswj deposition hlau (RMD) tsis muaj cag rov qab, zoo ib yam li cov tsos thiab zoo rau welds ua nrog GTAW backwash.
Ib feem tseem ceeb ntawm kev tiv thaiv corrosion ntawm stainless hlau yog chromium oxide.Tab sis yog tias cov ntsiab lus carbon ntawm cov vuam yog siab dhau lawm, chromium carbide yog tsim.Lawv khi chromium thiab tiv thaiv kev tsim ntawm qhov xav tau chromium oxide, uas ua rau cov hlau tsis muaj corrosion kuj.Yog tias 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 mus rau muab tub lim xaiv hlau thiab cua sov input tswj.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 qhov kub thiab txias yog qhov tseem ceeb tshwj xeeb tshaj yog thaum cov hlau tsis muaj cov pa roj carbon tsawg tsis haum.
Txo lub sij hawm qhov chaw vuam thiab qhov kub thiab txias nyob ntawm qhov kub siab, feem ntau yog 950 txog 1500 degrees Fahrenheit (500 txog 800 degrees Celsius).Qhov tsawg dua lub sij hawm soldering siv nyob rau hauv no ntau, qhov tsawg tshav kub nws generates.Nco ntsoov xyuas thiab saib xyuas qhov kub ntawm qhov sib cuam tshuam thaum lub sij hawm soldering txheej txheem.
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 carbide.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 weld 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, kev siv cov txheej txheem vuam hlau hauv cov kav hlau stainless 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.
Thaum welding stainless hlau siv roj arc vuam (GMAW) ib txwm siv argon thiab carbon dioxide, sib tov ntawm argon thiab oxygen los yog peb-gas sib tov (helium, argon thiab carbon dioxide).Feem ntau, cov khoom sib tov no feem ntau muaj argon lossis helium thiab tsawg dua 5% carbon dioxide, vim tias cov pa roj carbon dioxide muab cov pa roj carbon monoxide rau hauv lub pas dej thiab ua rau muaj kev pheej hmoo ntawm kev nkag siab.Ntshiab argon tsis pom zoo rau GMAW ntawm stainless hlau.
Cored hlau rau stainless hlau yog tsim los ua hauj lwm nrog ib txwm sib tov ntawm 75% argon thiab 25% carbon dioxide.Cov flux muaj cov khoom xyaw tsim los tiv thaiv kev sib kis ntawm cov vuam los ntawm cov pa roj carbon monoxide los ntawm cov roj thaiv kev tiv thaiv.
Raws li cov txheej txheem GMAW hloov zuj zus, lawv ua kom yooj yim dua rau vuam cov kav hlau stainless.Txawm hais tias qee daim ntawv thov tseem yuav xav tau cov txheej txheem GTAW, cov txheej txheem xaim siab tshaj plaws 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.
Lub hauv paus dhau los siv cov txheej txheem luv luv ntawm GMAW xws li Miller's controlled metal deposition (RMD) tshem tawm cov dej rov qab hauv qee cov ntawv thov austenitic stainless hlau.RMD cov hauv paus hla tuaj yeem ua raws li GMAW lossis flux-cored arc vuam, txuag lub sijhawm thiab nyiaj txiag piv rau backflush GTAW, tshwj xeeb tshaj yog nyob rau hauv txoj kab uas hla loj dua.
RMD siv cov kev tswj xyuas luv luv ntawm cov hlau hloov mus rau qhov chaw nyob ntsiag to, ruaj khov arc thiab vuam pas dej ua ke.Qhov no ua rau tsawg dua qhov txias khiav-hauv lossis tsis yaj, tsawg dua spatter thiab zoo dua 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 thiab yog li ntawd kub input thiab vuam ceev.
Cov txheej txheem tsis yog cov txheej txheem tuaj yeem txhim kho cov khoom siv vuam.Thaum siv RMD, qhov vuam ceev tuaj yeem yog 6 txog 12 in / min.Vim tias cov txheej txheem txhim kho cov khoom tsim tau yam tsis muaj cua sov ntxiv ntawm cov khoom, nws pab tswj cov khoom thiab corrosion kuj ntawm stainless hlau.Txo cov cua kub nkag ntawm cov txheej txheem kuj pab tswj substrate deformation.
Cov txheej txheem GMAW pulsed no muab luv luv arc ntev, nqaim arc cones, thiab cov cua kub tsawg dua li cov pa hloov pauv hloov pauv.Txij li thaum cov txheej txheem raug kaw, arc drift thiab hloov pauv nyob rau hauv qhov kev ncua deb ntawm lub ntsis thiab lub workpiece yog zoo tshem tawm.Qhov no ua kom yooj yim rau kev tswj cov pas dej ua ke nrog thiab tsis muaj vuam ntawm qhov chaw.Thaum kawg, kev sib xyaw ua ke ntawm GMAW rau kev sau thiab yob sab saum toj nrog RMD rau lub hauv paus yob tso cai rau cov txheej txheem vuam ua tiav siv ib lub xaim thiab ib qho roj, txo cov txheej txheem hloov sijhawm.
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Cov ntawv digital ntawm The Tube & Pipe Journal yog tam sim no nkag mus tau yooj yim, muab kev nkag tau yooj yim rau cov khoom lag luam muaj txiaj ntsig.
Tau txais tag nrho cov digital nkag mus rau STAMPING Journal, muaj cov thev naus laus zis tshiab, kev coj ua zoo tshaj plaws thiab xov xwm kev lag luam rau kev lag luam hlau stamping.
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