Argon backflush feem ntau yuav tsum tau rau vuam stainless hlau raj thiab kav dej siv cov txheej txheem xws li roj shielded tungsten arc vuam (GTAW) thiab shielded hlau arc vuam (SMAW). Tab sis tus nqi ntawm cov roj thiab lub sij hawm teeb tsa ntawm cov txheej txheem ntxuav tawm tuaj yeem yog qhov tseem ceeb, tshwj xeeb tshaj yog cov yeeb nkab diameters thiab qhov ntev nce.
Thaum welding 300 Series stainless hlau, cov neeg cog lus tuaj yeem tshem tawm rov qab-rhuav tawm hauv qhov qhib hauv paus kwj dej los ntawm kev hloov los ntawm ib txwm GTAW lossis SMAW mus rau cov txheej txheem vuam siab, thaum tswj cov vuam zoo, tswj cov khoom siv corrosion, thiab ua tau raws li Cov Txheej Txheem Vuam Specification (WPS). ) yuav tsum muaj cov txheej txheem luv luv hlau arc vuam (GMAW). Txoj kev txhim kho luv luv ntawm GMAW kuj muab kev ua tau zoo ntxiv, kev ua tau zoo thiab kev siv tau yooj yim los pab kom tau txais txiaj ntsig.
Vim lawv cov corrosion kuj thiab lub zog, stainless hlau alloys yog siv nyob rau hauv ntau cov yeeb nkab thiab piping daim ntaub ntawv, xws li roj thiab roj, petrochemicals, thiab biofuels. Thaum GTAW ib txwm siv rau hauv ntau daim ntawv thov stainless hlau, nws muaj qee qhov tsis zoo uas tuaj yeem hais nrog kev txhim kho luv luv GMAW.
Ua ntej, vim muaj qhov tsis txaus ntawm cov kws txawj vuam txuas ntxiv, nrhiav cov neeg ua haujlwm paub txog GTAW yog qhov kev sib tw tsis tu ncua. Qhov thib ob, GTAW tsis yog cov txheej txheem vuam ceev tshaj plaws, uas cuam tshuam cov tuam txhab nrhiav kev tsim khoom kom tau raws li cov neeg siv khoom xav tau. Thirdly, nws yuav tsum tau ntev thiab kim backflushing ntawm stainless hlau kav.
Cov lus teb yog dab tsi? Purge yog kev taw qhia cov roj thaum lub sij hawm vuam kom tshem tawm cov kab mob thiab muab kev txhawb nqa. Kev tshem tawm sab nraub qaum tiv thaiv sab nraub qaum ntawm lub vuam los ntawm kev tsim cov oxides hnyav nyob rau hauv lub xub ntiag ntawm oxygen.
Yog tias sab nraub qaum tsis muaj kev tiv thaiv thaum lub sij hawm vuam ntawm qhov qhib hauv paus kwj dej, kev puas tsuaj rau lub hauv paus yuav tshwm sim. Qhov kev puas tsuaj no yog hu ua saccharification vim tias nws ua rau muaj qab zib zoo li qhov chaw hauv qhov vuam. Txhawm rau tiv thaiv chafing, tus welder ntxig cov roj hose rau hauv ib qho kawg ntawm cov yeeb nkab thiab ntsaws qhov kawg ntawm cov yeeb nkab nrog lub valve. Lawv kuj tsim ib lub qhov cua ntawm lwm qhov kawg ntawm cov yeeb nkab. Lawv kuj feem ntau muab daim kab xev nyob ib ncig ntawm qhov qhib ntawm qhov sib koom ua ke. Tom qab ntxuav cov yeeb nkab, lawv tshem tawm ib daim kab xev nyob ib ncig ntawm qhov sib koom tes thiab pib vuam, rov ua dua cov txheej txheem stripping thiab vuam kom txog thaum lub hauv paus hlaws tiav.
Tshem tawm backlash. Retracing tuaj yeem raug nqi ntau lub sijhawm thiab nyiaj txiag, qee zaum ntxiv ntau txhiab nyiaj rau ib qhov project. Hloov mus rau lub voj voog luv luv GMAW cov txheej txheem tso cai rau lub tuam txhab ua cov hauv paus hla yam tsis muaj backflushing hauv ntau daim ntawv thov stainless hlau. Vuam 300 series stainless hlau yog zoo haum rau qhov no, thaum vuam siab purity duplex stainless hlau tam sim no yuav tsum muaj GTAW rau hauv paus hla.
Khaws cov cua kub kom tsawg li tsawg tau pab tswj qhov kev tiv thaiv corrosion ntawm lub workpiece. Ib txoj hauv kev los txo cov cua sov nkag yog txo tus naj npawb ntawm cov vuam hla dhau. Cov txheej txheem luv luv ntawm GMAW xws li kev tswj cov hlau tso nyiaj (RMD®) siv cov hlau hloov pauv kom meej meej kom ntseeg tau tias cov dej xau tsis zoo. Qhov no ua rau nws yooj yim dua rau cov welder los tswj lub pas dej ua ke, uas nyob rau hauv lem tswj lub tshav kub input thiab vuam ceev. Tsawg cua sov tso cai rau lub pas dej ua ke kom khov sai dua.
Vim muaj kev tswj xyuas cov hlau xa mus thiab ceev ceev ntawm lub pas dej weld, lub pas dej weld tsis tshua muaj turbulent thiab cov roj shielding tawm ntawm GMAW torch kuj smoothly. Qhov no tso cai rau cov roj tiv thaiv kom dhau los ntawm cov hauv paus hniav, yuam tawm cov cua thiab tiv thaiv cov suab thaj los yog oxidation nyob rau hauv qab ntawm cov weld. Qhov kev pabcuam roj no siv sijhawm luv luv vim tias cov pas dej khov khov sai heev.
Kev ntsuam xyuas tau pom tias qhov hloov pauv luv luv GMAW txheej txheem ua tau raws li cov qauv vuam zoo thaum tswj xyuas cov hlau tsis xeb corrosion ntawm GTAW cag hlaws vuam.
Hloov cov txheej txheem vuam xav kom lub tuam txhab rov lees paub WPS, tab sis qhov kev hloov pauv no tuaj yeem ua rau lub sijhawm tseem ceeb thiab txuag nqi ntawm kev tsim khoom tshiab thiab kho cov haujlwm.
Vuam qhib hauv paus kwj dej siv cov txheej txheem luv luv GMAW muab cov txiaj ntsig ntxiv hauv kev tsim khoom, kev ua haujlwm zoo thiab kev kawm vuam. Qhov no suav nrog:
Tshem tawm qhov muaj peev xwm ntawm cov xov kub kub vim qhov muaj peev xwm ntawm surfacing ntau hlau kom nce lub thickness ntawm cov kwj dej hauv paus.
Kev tiv thaiv zoo heev rau qhov siab thiab qis qis ntawm cov yeeb nkab seem. Nrog kev hloov hlau du, cov txheej txheem no tuaj yeem yooj yim txuas qhov sib txawv mus txog 3⁄16 ntiv tes.
Lub arc ntev yog tas li tsis hais txog ntawm electrode extension, uas them nyiaj rau qhov nyuaj ntawm cov neeg ua haujlwm uas pom tias nws nyuaj rau kev tswj xyuas qhov txuas mus tas li. Lub pas dej tuav tswj tau yooj yim dua thiab cov hlau tsis sib xws tuaj yeem txo lub sijhawm kev cob qhia rau cov welder tshiab.
Txo downtime rau cov txheej txheem hloov. Tib cov hlau thiab thaiv cov roj siv tau siv rau hauv paus, sau thiab npog cov kwj dej. Cov txheej txheem pulsed GMAW tuaj yeem siv tau yog tias cov channel tau ntim thiab kaw tsawg kawg 80% nrog argon shielding gas.
Rau kev ua haujlwm stainless hlau backflush, nws yog ib qho tseem ceeb uas yuav tsum ua raws li tsib lub ntsiab lus tseem ceeb rau kev hloov pauv mus rau kev hloov pauv luv luv GMAW txheej txheem.
Ntxuav cov kav dej sab hauv thiab tawm kom tshem tawm cov kab mob. Siv cov txhuam txhuam uas tsim los rau cov hlau tsis huv los ntxuav lub nraub qaum ntawm qhov sib koom ua ke tsawg kawg yog 1 nti ntawm ntug.
Siv lub siab silicon stainless hlau muab tub lim hlau xws li 316LSi lossis 308LSi. Cov ntsiab lus silicon siab dua txhawb kev ntub dej ntawm lub pas dej ua ke thiab ua raws li deoxidizer.
Txhawm rau kom tau txais txiaj ntsig zoo tshaj plaws, siv cov ntaub thaiv npog roj sib xyaw tshwj xeeb tsim rau cov txheej txheem, xws li 90% helium, 7.5% argon, thiab 2.5% carbon dioxide. Lwm qhov kev xaiv yog 98% argon thiab 2% carbon dioxide. Cov khoom siv roj vuam vuam tuaj yeem muaj lwm cov lus pom zoo.
Txhawm rau kom tau txais txiaj ntsig zoo tshaj plaws, siv cov lus qhia conical thiab cov hauv paus kwj dej kom pom cov pa roj. Conical nozzle nrog built-in roj diffuser muab kev pab zoo heev.
Nco ntsoov tias siv cov txheej txheem luv luv GMAW uas tsis muaj cov roj rov qab ua rau muaj qhov me me ntawm cov dross nyob rau hauv qab ntawm qhov vuam. Nws feem ntau flakes tawm raws li cov weld txias thiab ua tau raws li cov qauv zoo rau kev lag luam roj, fais fab nroj tsuag thiab petrochemicals.
Jim Byrne yog tus saib xyuas kev muag khoom thiab kev thov rau Miller Electric Mfg. LLC, 1635 W. Spencer St., Appleton, WI 54912, 920-734-9821, www.millerwelds.com.
Tube & Pipe Journal 于1990 年成为第一本致力于为金属管材行业服务的杂志. Tube & Pipe Journal 1990 Tube & Pipe Journal стал первым журналом, посвященным индустрии металлических труб в 1990 году. Tube & Pipe Journal tau dhau los ua thawj phau ntawv xov xwm tshwj xeeb rau kev lag luam yeeb nkab hlau hauv xyoo 1990.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 kev lag luam yeeb nkab.
Tam sim no nrog tag nrho nkag mus rau FABRICATOR cov ntawv luam tawm digital, nkag tau yooj yim rau cov peev txheej lag luam muaj txiaj ntsig.
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.
Tam sim no nrog rau tag nrho cov kev nkag mus rau Cov Fabricator en Español, koj muaj kev nkag tau yooj yim rau kev lag luam muaj txiaj ntsig.