Kev xaiv thiab kev npaj ntawm tungsten electrodes rau GTAW

Kev xaiv thiab kev npaj ntawm tungsten electrodes rau GTAW yog qhov tseem ceeb los txhim kho cov txiaj ntsig zoo thiab tiv thaiv kev sib kis thiab rov ua haujlwm dua.Cov duab Getty
Tungsten yog ib qho hlau tsis tshua muaj siv los ua cov roj tungsten arc vuam (GTAW) electrodes.Cov txheej txheem GTAW tso siab rau qhov hardness thiab kub tsis kam ntawm tungsten kom hloov cov vuam tam sim no mus rau arc.Lub melting point ntawm tungsten yog qhov siab tshaj plaws ntawm tag nrho cov hlau, ntawm 3,410 degrees Celsius.
Cov electrodes uas tsis yog-consumable electrodes tuaj nyob rau hauv ntau qhov ntau thiab tsawg thiab ntev, thiab yog tsim los ntawm cov ntshiab tungsten los yog alloys ntawm tungsten thiab lwm yam tsawg lub ntiaj teb cov ntsiab lus thiab oxides.Qhov kev xaiv ntawm electrode rau GTAW yog nyob ntawm hom thiab thickness ntawm lub substrate, thiab seb alternating tam sim no (AC) los yog ncaj qha tam sim no (DC) yog siv rau vuam.Qhov twg ntawm peb qhov kev npaj kawg uas koj xaiv, kheej kheej, taw qhia, lossis txiav, kuj tseem ceeb heev rau kev ua kom tau zoo thiab tiv thaiv kev sib kis thiab rov ua haujlwm dua.
Txhua electrode yog xim coded kom tshem tawm tsis meej pem txog nws hom.Cov xim tshwm rau ntawm qhov kawg ntawm lub electrode.
Pure tungsten electrodes (AWS classification EWP) muaj 99.50% tungsten, uas muaj tus nqi siab tshaj plaws ntawm tag nrho cov electrodes, thiab feem ntau pheej yig dua hlau electrodes.
Cov electrodes no tsim ib tug huv kheej kheej taub hau thaum rhuab thiab muab zoo heev arc stability rau AC vuam nrog sib npaug tsis.Ntshiab tungsten kuj muab kev ruaj ntseg zoo rau AC sine yoj vuam, tshwj xeeb tshaj yog nyob rau hauv txhuas thiab magnesium.Nws feem ntau tsis siv rau DC vuam vim nws tsis muab qhov muaj zog arc pib txuam nrog thorium lossis cerium electrodes.Nws tsis pom zoo kom siv cov tungsten ntshiab ntawm cov tshuab inverter;kom tau txais txiaj ntsig zoo tshaj plaws, siv ntse cerium lossis lanthanide electrodes.
Thorium tungsten electrodes (AWS classification EWTh-1 and EWTh-2) muaj tsawg kawg yog 97.30% tungsten thiab 0.8% mus rau 2.20% thorium.Muaj ob hom: EWTh-1 thiab EWTh-2, muaj 1% thiab 2%, feem.Raws li.Lawv feem ntau siv electrodes thiab nyiam rau lawv lub neej ua haujlwm ntev thiab siv tau yooj yim.Thorium txhim kho cov hluav taws xob emission zoo ntawm cov electrode, yog li txhim kho arc pib thiab tso cai rau muaj peev xwm nqa tam sim no ntau dua.Cov electrode ua haujlwm nyob deb ntawm nws qhov kub thiab txias, uas txo qis kev noj thiab tshem tawm arc drift, yog li txhim kho kev ruaj ntseg.Piv nrog rau lwm cov electrodes, thorium electrodes tso nyiaj tsawg dua tungsten nyob rau hauv lub pas dej molten, yog li lawv ua rau weld muaj kuab paug tsawg.
Cov electrodes no tsuas yog siv rau cov khoom siv hluav taws xob ncaj qha tam sim no tsis zoo (DCEN) vuam ntawm carbon steel, stainless hlau, npib tsib xee thiab titanium, nrog rau qee qhov tshwj xeeb AC vuam (xws li daim ntawv thov nyias nyias).
Thaum lub sij hawm tsim cov txheej txheem, thorium yog tusyees dispersed thoob plaws hauv lub electrode, uas pab tungsten tswj nws cov npoo ntse tom qab sib tsoo-qhov no yog qhov zoo tagnrho electrode zoo rau vuam nyias hlau.Nco tseg: Thorium yog xov tooj cua, yog li koj yuav tsum ua raws li cov chaw tsim khoom cov lus ceeb toom, cov lus qhia thiab cov ntaub ntawv kev nyab xeeb cov ntaub ntawv (MSDS) thaum siv nws.
Cerium tungsten electrode (AWS classification EWCe-2) muaj tsawg kawg yog 97.30% tungsten thiab 1.80% mus rau 2.20% cerium, thiab hu ua 2% cerium.Cov electrodes no ua tau zoo tshaj plaws hauv DC vuam ntawm qhov chaw qis tam sim no, tab sis tuaj yeem siv tau zoo hauv cov txheej txheem AC.Nrog nws zoo heev arc pib ntawm tsawg amperage, cerium tungsten yog nrov nyob rau hauv daim ntaub ntawv xws li rail raj thiab yeeb nkab manufacturing, sheet hlau ua, thiab kev ua hauj lwm uas muaj me me thiab meej qhov chaw.Zoo li thorium, nws yog qhov zoo tshaj plaws siv rau vuam carbon steel, stainless hlau, nickel alloys thiab titanium.Qee zaum, nws tuaj yeem hloov 2% thorium electrodes.Cov khoom hluav taws xob ntawm cerium tungsten thiab thorium txawv me ntsis, tab sis feem ntau cov welders tsis paub qhov txawv ntawm lawv.
Kev siv ntau dua amperage cerium electrode yog tsis pom zoo, vim hais tias ntau dua amperage yuav ua rau cov oxide mus sai sai rau lub taub hau kub, tshem tawm cov ntsiab lus oxide thiab invalidate cov txheej txheem zoo.
Siv cov lus taw qhia thiab / lossis cov lus qhia luv luv (rau cov ntshiab tungsten, cerium, lanthanum thiab thorium hom) rau inverter AC thiab DC vuam txheej txheem.
Lanthanum tungsten electrodes (AWS classifications EWLa-1, EWLa-1.5 and EWLa-2) muaj tsawg kawg yog 97.30% tungsten thiab 0.8% mus rau 2.20% lanthanum lossis lanthanum, thiab hu ua EWLa-1, EWLa-1.5 thiab EWLa-2 Lanthanum Department ntawm cov ntsiab lus.Cov electrodes no muaj peev xwm pib arc zoo, tsis tshua muaj hluav taws xob tsawg, zoo arc stability thiab zoo heev reignition yam ntxwv-ntau yam zoo ib yam li cerium electrodes.Lanthanide electrodes kuj muaj cov khoom siv hluav taws xob ntawm 2% thorium tungsten.Qee zaum, lanthanum-tungsten tuaj yeem hloov thorium-tungsten yam tsis muaj kev hloov pauv loj rau cov txheej txheem vuam.
Yog tias koj xav ua kom zoo dua qhov muaj peev xwm vuam, lanthanum tungsten electrode yog qhov kev xaiv zoo tshaj plaws.Lawv haum rau AC lossis DCEN nrog cov lus qhia, lossis lawv tuaj yeem siv nrog AC sine yoj fais fab mov.Lanthanum thiab tungsten tuaj yeem tuav lub ntsej muag ntse heev, uas yog qhov zoo dua rau vuam hlau thiab stainless hlau ntawm DC lossis AC siv lub zog hluav taws xob square.
Tsis zoo li thorium tungsten, cov electrodes no haum rau AC vuam thiab, zoo li cerium electrodes, tso cai rau lub arc pib thiab tswj ntawm qis voltage.Piv nrog rau cov ntshiab tungsten, rau ib tug muab electrode loj, qhov sib ntxiv ntawm lanthanum oxide tsub kom lub siab tshaj plaws tam sim no-nqa peev los ntawm kwv yees li 50%.
Zirconium tungsten electrode (AWS classification EWZr-1) muaj tsawg kawg yog 99.10% tungsten thiab 0.15% txog 0.40% zirconium.Lub zirconium tungsten electrode tuaj yeem tsim qhov chaw ruaj khov thiab tiv thaiv tungsten spatter.Nws yog qhov kev xaiv zoo tshaj plaws rau AC welding vim nws khaws ib lub taub hau kheej kheej thiab muaj kev tiv thaiv kab mob siab.Nws lub peev xwm nqa tam sim no sib npaug los yog ntau dua thorium tungsten.Nws tsis pom zoo kom siv zirconium rau DC vuam nyob rau txhua qhov xwm txheej.
Lub ntiaj teb tsis tshua muaj tungsten electrode (AWS classification EWG) muaj cov tsis tshua muaj lub ntiaj teb oxide additives los yog ib qho kev sib xyaw ua ke ntawm cov oxides sib txawv, tab sis cov chaw tsim khoom xav tau qhia txhua qhov ntxiv thiab nws feem pua ​​​​ntawm pob.Nyob ntawm cov khoom siv ntxiv, cov txiaj ntsig xav tau tuaj yeem suav nrog kev tsim cov arc ruaj khov thaum lub sijhawm AC thiab DC cov txheej txheem, lub neej ntev dua li thorium tungsten, muaj peev xwm siv cov kab me me electrodes hauv tib txoj haujlwm, thiab kev siv cov electrodes ntawm qhov zoo sib xws, siab dua tam sim no, thiab tsawg dua tungsten spatter.
Tom qab xaiv hom electrode, cov kauj ruam tom ntej yog xaiv qhov kev npaj kawg.Peb txoj kev xaiv yog spherical, taw tes thiab truncated.
Lub taub hau kheej kheej feem ntau yog siv rau cov ntshiab tungsten thiab zirconium electrodes thiab pom zoo rau cov txheej txheem AC ntawm sine yoj thiab tsoos square yoj GTAW tshuab.Txhawm rau kom ua tiav qhov kawg ntawm lub tungsten, tsuas yog siv AC tam sim no pom zoo rau ib txoj kab uas hla ntawm electrode (saib daim duab 1), thiab lub pob yuav raug tsim los ntawm qhov kawg ntawm cov electrode.
Txoj kab uas hla ntawm tus kheej kheej kawg yuav tsum tsis pub tshaj 1.5 npaug ntawm txoj kab uas hla ntawm lub electrode (piv txwv li, 1/8-inch electrode yuav tsum tsim 3/16-inch diameter kawg).Ib qho loj dua ntawm qhov kawg ntawm lub electrode txo qhov arc stability.Nws kuj tseem tuaj yeem poob thiab kis kab mob.
Cov lus qhia thiab / lossis cov lus qhia luv luv (rau cov ntshiab tungsten, cerium, lanthanum thiab thorium hom) yog siv hauv inverter AC thiab DC vuam txheej txheem.
Txhawm rau zom tungsten kom zoo, siv lub log sib tsoo tshwj xeeb tsim los rau kev sib tsoo tungsten (kom tiv thaiv kev sib kis) thiab lub log sib tsoo ua los ntawm borax lossis pob zeb diamond (kom tiv thaiv qhov nyuaj ntawm tungsten).Lus Cim: Yog tias koj tab tom sib tsoo thorium tungsten, thov nco ntsoov tswj thiab sau cov plua plav;qhov chaw sib tsoo muaj qhov cua txaus;thiab ua raws li cov chaw tsim khoom cov lus ceeb toom, cov lus qhia thiab MSDS.
Sib tsoo cov tungsten ncaj qha rau ntawm lub log ntawm lub kaum sab xis ntawm 90 degree (saib daim duab 2) kom ntseeg tau tias qhov sib tsoo cov cim txuas mus rau qhov ntev ntawm cov electrode.Ua li no tuaj yeem txo qhov muaj ridges ntawm tungsten, uas yuav ua rau arc drift los yog yaj mus rau hauv lub pas dej ua ke, ua rau muaj kab mob.
Feem ntau, koj xav zom cov taper ntawm tungsten kom tsis pub ntau tshaj 2.5 npaug ntawm txoj kab uas hla ntawm electrode (piv txwv li, rau 1/8-nti electrode, hauv av yog 1/4 txog 5/16 ntiv tes ntev).Sib tsoo tungsten rau hauv lub khob hliav qab tuaj yeem ua kom yooj yim rau kev hloov pauv ntawm arc pib, thiab tsim kom muaj kev sib koom ua ke ntau dua, kom tau txais kev vuam zoo dua.
Thaum vuam ntawm cov ntaub ntawv nyias (0.005 txog 0.040 ntiv tes) ntawm qhov tsis tshua muaj tam sim no, nws yog qhov zoo tshaj plaws los zom cov tungsten mus rau qhov taw tes.Lub taub tso cai rau cov vuam tam sim no xa mus rau hauv qhov tsom arc thiab pab tiv thaiv kev deformation ntawm nyias hlau xws li txhuas.Nws tsis pom zoo kom siv cov taw qhia tungsten rau cov ntawv thov tam sim no ntau dua vim tias qhov siab dua tam sim no yuav tshuab tawm ntawm qhov kawg ntawm tungsten thiab ua rau muaj kab mob ntawm lub pas dej ua ke.
Rau cov ntawv thov tam sim no siab dua, nws yog qhov zoo tshaj plaws los zom cov truncated ntsis.Yuav kom tau txais cov duab no, tungsten yog thawj zaug hauv av rau taper tau piav qhia saum toj no, thiab tom qab ntawd hauv av rau 0.010 txog 0.030 ntiv tes.Cov av tiaj tus tom kawg ntawm tungsten.Qhov av tiaj tus no pab tiv thaiv tungsten los ntawm kev xa mus los ntawm arc.Nws kuj tiv thaiv kev tsim cov pob.
WELDER, yav tas los hu ua Practical Welding Niaj hnub no, nthuav qhia cov neeg tiag tiag uas ua cov khoom peb siv thiab ua haujlwm txhua hnub.Cov ntawv xov xwm no tau ua haujlwm rau cov koom haum vuam hauv North America rau ntau tshaj 20 xyoo.

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