Vuam cov yeeb nkab stainless hlau thiab cov kav dej feem ntau xav tau kev ntxuav rov qab nrog argon thaum siv cov txheej txheem ib txwm muaj xws li roj tungsten arc vuam (GTAW) thiab hlau shielded arc vuam (SMAW). Tab sis tus nqi roj thiab lub sijhawm teeb tsa ntawm cov txheej txheem ntxuav tuaj yeem tseem ceeb, tshwj xeeb tshaj yog thaum cov yeeb nkab txoj kab uas hla thiab ntev nce ntxiv.
Thaum vuam cov hlau tsis xeb 300 series, cov neeg cog lus tuaj yeem tshem tawm qhov tawg hauv cov qhov qhib hauv paus hniav los ntawm kev hloov ntawm GTAW lossis SMAW ib txwm mus rau cov txheej txheem vuam zoo dua, thaum tseem ua tiav qhov zoo ntawm kev vuam, tswj cov khoom siv tiv thaiv xeb, thiab ua tau raws li Cov Txheej Txheem Welding (WPS) xav tau cov txheej txheem luv luv roj hlau arc vuam (GMAW). Cov txheej txheem luv luv GMAW zoo dua kuj coj cov txiaj ntsig ntxiv hauv kev tsim khoom, kev ua haujlwm zoo thiab yooj yim siv, pab txhim kho cov txiaj ntsig.
Vim lawv txoj kev tiv taus xeb thiab lub zog, cov hlau tsis xeb siv rau hauv ntau cov yeeb nkab thiab cov raj xa dej, suav nrog roj thiab roj av, petrochemical, thiab biofuels. Txawm hais tias GTAW tau siv rau hauv ntau cov hlau tsis xeb, nws muaj qee qhov tsis zoo uas tuaj yeem daws tau los ntawm kev txhim kho luv luv GMAW.
Ua ntej, vim tias qhov tsis txaus cov kws tshaj lij welders txuas ntxiv mus, kev nrhiav cov neeg ua haujlwm paub txog GTAW yog qhov nyuaj tas mus li. Qhov thib ob, GTAW tsis yog cov txheej txheem vuam ceev tshaj plaws, uas cuam tshuam cov tuam txhab uas tab tom nrhiav kev nce kev tsim khoom kom tau raws li cov neeg siv khoom xav tau. Qhov thib peb, nws yuav tsum tau siv sijhawm ntau thiab kim heev rov qab ntxuav cov yeeb nkab stainless hlau.
Blowback yog dab tsi? Purge yog kev qhia txog roj thaum lub sijhawm vuam kom tshem tawm cov khoom tsis huv thiab muab kev txhawb nqa. Qhov backside purge tiv thaiv sab nraub qaum ntawm qhov vuam los ntawm kev tsim cov oxides hnyav thaum muaj oxygen.
Yog tias sab nraub qaum tsis raug tiv thaiv thaum lub sijhawm qhib kev vuam hauv paus hniav, kev puas tsuaj rau cov khoom siv yuav tshwm sim. Qhov kev tawg no hu ua saccharification, yog li ntawd hu ua vim nws ua rau muaj qhov chaw zoo li qab zib hauv qhov vuam. Txhawm rau tiv thaiv kev sib tsoo, tus kws vuam ntxig lub raj roj rau hauv ib kawg ntawm cov yeeb nkab thiab ntsaws qhov kawg ntawm cov yeeb nkab nrog lub pas dej ntxuav. Lawv kuj tsim lub qhov cua rau sab tod ntawm cov yeeb nkab. Lawv kuj feem ntau muab daim kab xev ncig lub qhov sib koom ua ke. Tom qab ntxuav cov yeeb nkab, lawv tev tawm ib ntu ntawm daim kab xev ncig lub qhov sib koom ua ke thiab pib vuam, rov ua cov txheej txheem ntawm kev tev tawm thiab vuam kom txog thaum cov hauv paus hniav tiav.
Tshem tawm qhov blowback. Cov retraces tuaj yeem siv sijhawm thiab nyiaj ntau, qee zaum ntxiv ntau txhiab daus las rau qhov project. Kev hloov mus rau qhov kev txhim kho luv luv GMAW txheej txheem tau ua rau lub tuam txhab ua tiav cov hauv paus hla yam tsis muaj backflushing hauv ntau daim ntawv thov stainless hlau. Daim ntawv thov vuam rau 300 series stainless hlau yog qhov zoo rau qhov no, thaum cov ntawv thov vuam rau cov hlau duplex siab-purity tam sim no xav tau GTAW rau cov hauv paus hla.
Kev ua kom cov cua sov nkag mus rau hauv qhov chaw ua haujlwm tsawg li tsawg tau pab tswj kom cov khoom ua haujlwm tsis txhob xeb. Kev txo cov naj npawb ntawm cov vuam hla yog ib txoj hauv kev los txo cov cua sov nkag mus. Cov txheej txheem GMAW luv luv uas tau txhim kho, xws li Regulated Metal Deposition (RMD®), siv cov hlau hloov pauv uas tswj tau zoo kom muab cov dej ntws sib npaug. Qhov no ua rau nws yooj yim dua rau tus neeg vuam los tswj cov dej vuam, uas ua rau tswj cov cua sov nkag mus thiab qhov ceev ntawm kev vuam. Cov cua sov nkag mus qis dua tso cai rau cov dej vuam kom khov sai dua.
Nrog kev tswj hwm kev hloov pauv hlau thiab kev khov ntawm lub pas dej vuam sai dua, lub pas dej vuam tsis tshua muaj kev ntxhov siab thiab cov roj tiv thaiv tawm hauv rab phom GMAW tsis muaj kev cuam tshuam. Qhov no tso cai rau cov roj tiv thaiv hla dhau lub hauv paus qhib, hloov chaw huab cua thiab tiv thaiv kev saccharification lossis oxidation rau sab nraub qaum ntawm lub vuam. Qhov kev npog roj no tsuas yog siv sijhawm luv luv vim tias cov dej khov sai heev.
Kev sim tau qhia tias cov txheej txheem GMAW luv luv uas tau hloov kho ua tau raws li cov qauv zoo ntawm kev vuam thaum tseem tswj tau qhov kev tiv thaiv xeb ntawm cov hlau tsis xeb zoo li thaum lub hauv paus hniav tau vuam nrog GTAW.
Kev hloov pauv ntawm cov txheej txheem vuam yuav tsum tau kom lub tuam txhab rov lees paub nws daim WPS, tab sis qhov kev hloov pauv no tuaj yeem ua rau muaj kev rov qab los ntau thiab txuag tau nyiaj rau kev tsim khoom tshiab thiab kho dua tshiab.
Kev vuam qhib hauv paus hniav siv cov txheej txheem GMAW luv luv uas zoo dua qub muab cov txiaj ntsig ntxiv rau kev tsim khoom, kev ua haujlwm zoo thiab kev cob qhia welder. Cov no suav nrog:
Tshem tawm qhov muaj peev xwm rau cov channel kub vim yog qhov muaj peev xwm tso ntau hlau kom ua rau cov hauv paus hniav tuab dua.
Kev kam rau siab zoo heev rau qhov siab thiab qis tsis sib xws ntawm cov yeeb nkab. Vim yog kev hloov hlau du, cov txheej txheem tuaj yeem yooj yim txuas cov qhov sib txawv txog li 3/16 ntiv tes.
Qhov ntev ntawm lub arc yog sib xws txawm tias lub electrode ntev npaum li cas los xij, uas them rau cov neeg ua haujlwm uas muaj teeb meem tswj kom ntev tas mus li. Lub weld puddle uas yooj yim tswj tau thiab kev hloov hlau tas mus li tuaj yeem txo lub sijhawm kawm rau cov neeg vuam tshiab.
Txo lub sijhawm tsis ua haujlwm rau kev hloov pauv txheej txheem. Tib lub xov hlau thiab cov roj tiv thaiv tuaj yeem siv rau cov hauv paus hniav, sau thiab hau cov channel. Ib qho txheej txheem GMAW pulsed tuaj yeem siv tau yog tias cov channel tau sau thiab capped nrog tsawg kawg 80% argon shielding roj.
Rau cov haujlwm uas tab tom nrhiav kev tshem tawm cov backflush hauv cov ntawv thov stainless hlau, nws yog ib qho tseem ceeb uas yuav tsum ua raws li tsib lub tswv yim tseem ceeb rau kev vam meej thaum hloov mus rau cov txheej txheem luv luv GMAW uas tau hloov kho.
Ntxuav sab hauv thiab sab nraud ntawm cov kav dej kom tshem tawm cov khoom tsis huv. Siv txhuam hlau uas tsim los rau cov hlau tsis xeb los ntxuav sab nraub qaum ntawm qhov sib koom ua ke tsawg kawg yog 1 nti ntawm ntug.
Siv cov hlau tsis xeb uas muaj cov silicon ntau, xws li 316LSi lossis 308LSi. Cov silicon ntau dua pab ua kom lub pas dej vuam ntub thiab ua haujlwm ua cov tshuaj deoxidizer.
Rau kev ua haujlwm zoo tshaj plaws, siv cov roj sib xyaw tiv thaiv uas tsim tshwj xeeb rau cov txheej txheem, xws li 90% helium, 7.5% argon, thiab 2.5% carbon dioxide. Lwm txoj kev xaiv yog 98% argon thiab 2% carbon dioxide. Tus neeg muab roj vuam yuav muaj lwm cov lus pom zoo.
Rau qhov zoo tshaj plaws, siv lub taub hau tapered thiab lub nozzle rau kev xa cov hauv paus hniav kom pom qhov chaw npog roj. Lub nozzle conical nrog lub built-in gas diffuser muab kev npog zoo heev.
Nco ntsoov tias siv cov txheej txheem GMAW luv luv uas tau hloov kho yam tsis muaj roj rov qab ua rau muaj qhov me me ntawm sab nraub qaum ntawm qhov vuam. Qhov no feem ntau yuav tawg thaum qhov vuam txias thiab ua tau raws li cov qauv zoo rau roj av, chaw tsim hluav taws xob thiab cov ntawv thov petrochemical.
Jim Byrne yog Tus Thawj Saib Xyuas Kev Muag Khoom thiab Daim Ntawv Thov rau Miller Electric Mfg. LLC, 1635 W. Spencer St., Appleton, WI 54912, 920-734-9821, www.millerwelds.com.
Phau Ntawv Xov Xwm Tube & Pipe tau los ua thawj phau ntawv xov xwm uas mob siab rau kev lag luam yeeb nkab hlau hauv xyoo 1990. Niaj hnub no, nws tseem yog tib phau ntawv tshaj tawm hauv North America uas mob siab rau kev lag luam thiab tau dhau los ua qhov chaw ntseeg siab tshaj plaws rau cov kws tshaj lij yeeb nkab.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm The FABRICATOR, nkag mus tau yooj yim rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.
Cov ntawv xov xwm digital ntawm The Tube & Pipe Journal tam sim no nkag tau tag nrho, muab kev nkag mus tau yooj yim rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.
Txaus siab rau kev nkag mus rau tag nrho cov ntawv digital ntawm STAMPING Journal, uas muab cov kev nce qib tshiab tshaj plaws, cov kev coj ua zoo tshaj plaws thiab cov xov xwm kev lag luam rau kev lag luam hlau stamping.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm The Fabricator en Español, nkag mus tau yooj yim rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.