Vuam stainless hlau tubing thiab kav dej feem ntau yuav tsum tau rov qab purging nrog argon thaum siv cov txheej txheem ib txwm muaj xws li roj tungsten arc vuam (GTAW) thiab cov hlau thaiv hlau arc vuam (SMAW).
Thaum welding 300 series stainless hlau, cov neeg cog lus tuaj yeem tshem tawm qhov kev sib tsoo hauv qhov qhib hauv paus kwj dej los ntawm kev hloov ntawm GTAW lossis SMAW rau kev txhim kho cov txheej txheem vuam, thaum tseem ua tau zoo weld zoo, tswj cov khoom siv corrosion kuj, thiab ntsib Cov Txheej Txheem Vuam Cov Txheej Txheem (WPS) yuav tsum muaj luv luv-circuit gascuit hlau arc GMAW cov txheej txheem ntxiv. nyob rau hauv productivity, efficiency thiab yooj yim ntawm kev siv, pab txhim kho profits.
Favored rau lawv corrosion kuj thiab lub zog, stainless hlau alloys yog siv nyob rau hauv ntau cov yeeb nkab thiab tubing daim ntaub ntawv, nrog rau cov roj thiab roj, petrochemical, thiab biofuels.While GTAW tau ib txwm siv nyob rau hauv ntau stainless steel daim ntaub ntawv, nws muaj ib co tsis zoo uas yuav daws tau los ntawm kev txhim kho luv luv-circuit GMAW.
Ua ntej, raws li qhov tsis txaus ntawm cov kws tshaj lij vuam txuas ntxiv mus, nrhiav cov neeg ua haujlwm paub txog GTAW yog qhov kev sib tw tsis tu ncua. 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.Third, nws yuav tsum tau siv sijhawm ntev thiab kim backflushing ntawm stainless hlau tubing.
Dab tsi yog blowback?Purge yog qhov kev taw qhia ntawm cov roj thaum lub sij hawm vuam txheej txheem kom tshem tawm cov kab mob thiab muab kev txhawb nqa.Lub backside purge tiv thaiv lub backside ntawm weld los ntawm kev ua hnyav oxides nyob rau hauv lub xub ntiag ntawm oxygen.
Yog hais tias lub backside tsis muaj kev tiv thaiv thaum qhib hauv paus kwj dej welding, kev puas tsuaj rau lub substrate yuav tshwm sim.Qhov kev puas tsuaj no yog hu ua saccharification, yog li lub npe vim nws ua rau ib tug nto zoo li qab zib nyob rau hauv lub weld.Txhim kho mashing, lub welder inserts ib tug roj hose rau hauv ib kawg ntawm cov yeeb nkab thiab ntsaws qhov kawg ntawm cov yeeb nkab nrog ib tug purge dam.Lawv kuj tsim ib tug sib koom ua ke ntawm cov yeeb nkab. cov yeeb nkab, lawv tev tawm ib ntu ntawm daim kab xev nyob ib ncig ntawm lub pob qij txha thiab pib vuam, rov ua cov txheej txheem ntawm stripping thiab vuam kom txog thaum lub hauv paus hlaws tiav.
Tshem tawm blowback.Retraces tuaj yeem raug nqi ntau lub sijhawm thiab nyiaj txiag, qee zaum ntxiv ntau txhiab daus las rau qhov project.Kev hloov mus rau qhov kev txhim kho luv luv GMAW txheej txheem tso cai rau lub tuam txhab ua tiav cov hauv paus hla tsis muaj backflushing nyob rau hauv ntau stainless steel daim ntaub ntawv.Vuam daim ntaub ntawv rau 300 series stainless steels yog zoo suited rau qhov no, thaum vuam daim ntaub ntawv rau high-purity stainless hlau duplex tam sim no.
Ua kom cov cua sov tawm kom tsawg li tsawg tau pab tswj qhov kev tiv thaiv corrosion ntawm cov khoom ua haujlwm. Txo cov xov tooj ntawm vuam yog ib txoj hauv kev los txo cov cua sov input.Txhim kho luv luv-circuit GMAW cov txheej txheem, xws li Regulated Hlau Deposition (RMD®), siv precisely tswj hlau hloov mus rau cov khaub ncaws droplet deposition. tso tso cai rau lub weld puddle kom khov sai dua.
Nrog kev tswj cov hlau hloov thiab ceev vuam pas dej khov, lub pas dej weld tsis tshua muaj turbulent thiab shielding roj tawm ntawm GMAW phom kuj tsis muaj kev cuam tshuam.Qhov no tso cai rau cov roj shielding los ntawm cov hauv paus qhib, tshem tawm cov huab cua thiab tiv thaiv saccharification los yog oxidation nyob rau sab nraum qab ntawm lub weld.Cov pa roj no tsuas yog siv sij hawm luv luv vim tias puddles khov.
Kev ntsuam xyuas tau pom tias cov txheej txheem luv luv-circuit GMAW ua tau raws li cov qauv kev sib txuas zoo thaum tuav cov kev tiv thaiv corrosion ntawm cov hlau tsis zoo li thaum lub hauv paus hlaws tau welded nrog GTAW.
Kev hloov hauv cov txheej txheem vuam xav kom lub tuam txhab rov lees paub nws WPS, tab sis qhov hloov pauv no tuaj yeem muab lub sijhawm rov qab los thiab txuag nqi rau kev tsim khoom tshiab thiab kho cov haujlwm.
Qhib hauv paus kwj dej welding siv ib qho kev txhim kho luv luv-circuit GMAW txheej txheem muaj cov txiaj ntsig ntxiv hauv kev tsim khoom, kev ua tau zoo thiab kev cob qhia welder.Cov no suav nrog:
Tshem tawm lub peev xwm rau cov channel kub raws li qhov muaj peev xwm tso cov hlau ntau ntxiv kom cov thickness ntawm cov hauv paus channel.
Ua tau zoo heev rau siab thiab qis misalignment ntawm cov yeeb nkab seem.Vim cov hlau hloov tau yooj yim, cov txheej txheem tuaj yeem yooj yim txuas qhov sib txawv mus txog 3⁄16 ntiv tes.
Arc ntev yog zoo ib yam tsis hais txog ntawm electrode extension, uas compensates rau cov neeg ua hauj lwm uas tawm tsam kom zoo ib yam extension.Ib yooj yim dua tswj weld puddle thiab zoo sib xws hlau hloov yuav txo tau lub sij hawm kawm rau cov tshiab welders.
Txo qis qis rau cov txheej txheem hloov pauv.Cov tib lub xaim thiab cov roj thaiv hluav taws xob tuaj yeem siv rau hauv paus, sau thiab cap channels.A cov txheej txheem GMAW tuaj yeem siv tau muab cov channel tau ntim thiab capped nrog tsawg kawg 80% argon shielding gas.
Rau kev ua haujlwm uas xav kom tshem tawm cov backflush hauv stainless hlau daim ntaub ntawv, nws yog ib qho tseem ceeb uas yuav tsum tau ua raws li tsib lub ntsiab lus tseem ceeb rau kev ua tiav thaum hloov mus rau cov txheej txheem luv luv GMAW.
Ntxuav cov kav dej sab hauv thiab sab nraud kom tshem tawm cov kab mob.Siv cov hlau txhuam uas tsim los rau cov hlau tsis huv los ntxuav lub nraub qaum ntawm qhov sib koom ua ke tsawg kawg 1 nti ntawm ntug.
Siv cov hlau tsis muaj steel hlau uas muaj cov ntsiab lus silicon siab, xws li 316LSi lossis 308LSi.Cov ntsiab lus silicon siab dua pab lub pas dej da dej thiab ua raws li deoxidizer.
Rau kev ua tau zoo tshaj plaws, siv cov khoom siv hluav taws xob tiv thaiv tshwj xeeb 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 vuam vuam yuav muaj lwm cov lus pom zoo.
Txhawm rau kom tau txais txiaj ntsig zoo tshaj plaws, siv lub taub hau thiab lub taub hau rau cov hauv paus channeling los nrhiav cov pa roj.
Nco ntsoov tias kev siv cov txheej txheem luv luv-circuit GMAW uas tsis muaj roj rov qab ua rau me me ntawm cov nplai ntawm qhov nraub qaum ntawm qhov vuam.Qhov no feem ntau flakes tawm raws li cov weld txias thiab ua tau raws li cov qauv zoo rau roj av, fais fab nroj tsuag thiab petrochemical daim ntaub ntawv.
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.
Tube & Pipe Journal tau dhau los ua thawj phau ntawv xov xwm mob siab rau ua haujlwm rau kev lag luam yeeb nkab hlau hauv xyoo 1990.Hnub no, nws tseem yog qhov kev tshaj tawm nkaus xwb hauv North America mob siab rau kev lag luam thiab tau dhau los ua cov ntaub ntawv 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 FABRICATOR, yooj yim nkag mus rau cov khoom 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.
Txaus siab rau kev nkag mus rau tag nrho cov ntawv luam tawm digital ntawm STAMPING Journal, uas muab cov txheej txheem 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 kev nkag mus rau tag nrho cov ntawv digital ntawm Tus Fabricator en Español, nkag tau yooj yim rau kev lag luam muaj txiaj ntsig.