Kev xaiv thiab npaj tungsten electrodes rau GTAW

Kev xaiv thiab npaj tungsten electrodes rau GTAW yog qhov tseem ceeb txhawm rau ua kom tau txiaj ntsig zoo thiab tiv thaiv kev sib kis thiab rov ua haujlwm. Cov duab Getty
Tungsten yog cov hlau uas tsis tshua muaj siv los ua roj tungsten arc vuam (GTAW) cov hluav taws xob. Cov txheej txheem GTAW tso siab rau qhov tawv thiab tiv taus kub ntawm tungsten txhawm rau hloov cov vuam tam sim no mus rau lub arc. Lub ntsiab lus yaj ntawm tungsten yog qhov siab tshaj ntawm txhua yam hlau, ntawm 3,410 degrees Celsius.
Cov hluav taws xob uas siv tsis tau los no muaj ntau qhov ntau thiab qhov ntev, thiab tau tsim los ntawm cov tungsten ntshiab lossis cov hlau phom ntawm tungsten thiab lwm yam khoom hauv ntiaj teb uas tsis tshua muaj thiab oxides. Kev xaiv hluav taws xob rau GTAW nyob ntawm seb hom twg thiab tuab npaum li cas, thiab seb puas hloov pauv tam sim no (AC) lossis ncaj qha tam sim no (DC) yog siv rau vuam. Qhov twg ntawm peb qhov kev npaj zaum kawg uas koj xaiv, kheej kheej, taw qhia, lossis txiav tawm, tseem yog qhov tseem ceeb rau kev ua kom tau zoo thiab tiv thaiv kev sib kis thiab rov ua haujlwm.
Txhua lub tshuab hluav taws xob yog xim xim txhawm rau tshem tawm qhov tsis meej pem txog nws hom. Cov xim tshwm ntawm qhov taub ntawm cov electrode.
Ntshiab tungsten electrodes (AWS kev faib tawm EWP) muaj 99.50% tungsten, uas muaj kev siv ntau tshaj plaws ntawm txhua cov hluav taws xob, thiab feem ntau pheej yig dua li cov hlau phom hlau.
Cov hluav taws xob no tsim cov lus qhia ntxhua ntxhua kom huv thaum ua kom sov thiab muab cov khoom ruaj khov zoo rau AC vuam nrog cov nthwv dej sib npaug. Ntshiab tungsten tseem muab kev ruaj ntseg zoo rau AC sine wave welding, tshwj xeeb tshaj yog ntawm txhuas thiab magnesium. Feem ntau nws tsis siv rau DC vuam vim nws tsis muab lub zog pib muaj feem cuam tshuam 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 cov ntse cerium lossis lanthanide electrodes.
Thorium tungsten electrodes (AWS kev faib tawm EWTh-1 thiab EWTh-2) muaj tsawg kawg 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 hluav taws xob thiab tau txais txiaj ntsig zoo rau lawv lub neej ua haujlwm ntev thiab siv tau yooj yim. Thorium txhim kho cov khoom siv hluav taws xob zoo ntawm cov hluav taws xob, yog li txhim kho arc pib thiab tso cai tam sim no muaj peev xwm nqa tau ntau dua. Cov hluav taws xob ua haujlwm qis dua nws qhov kub yaj, uas txo qis kev noj haus thiab tshem tawm arc drift, yog li txhim kho kev ruaj ntseg. Piv nrog rau lwm cov hluav taws xob, thorium electrodes tso tsawg tungsten hauv pas dej ua ke, yog li lawv ua rau cov kuab paug tsawg dua.
Cov hluav taws xob no feem ntau yog siv ncaj qha rau tam sim no tsis zoo electrode (DCEN) vuam cov pa roj carbon hlau, stainless hlau, npib tsib xee thiab titanium, ntxiv rau qee qhov tshwj xeeb AC vuam (xws li daim ntawv thov txhuas).
Thaum lub sijhawm tsim cov txheej txheem, thorium tau sib npaug sib npaug thoob plaws hauv cov hluav taws xob, uas pab tungsten kom tswj nws cov ntse tom qab sib tsoo-qhov no yog qhov zoo tshaj plaws electrode zoo rau vuam hlau nyias. Nco tseg: Thorium yog hluav taws xob, yog li koj yuav tsum ib txwm ua raws li cov chaw tsim khoom cov lus ceeb toom, cov lus qhia thiab cov ntaub ntawv kev nyab xeeb khoom siv (MSDS) thaum siv nws.
Cerium tungsten electrode (AWS kev faib tawm EWCe-2) muaj tsawg kawg 97.30% tungsten thiab 1.80% rau 2.20% cerium, thiab hu ua 2% cerium. Cov hluav taws xob no ua tau zoo tshaj plaws hauv DC vuam ntawm qhov chaw qis tam sim no, tab sis tuaj yeem siv tau zoo hauv AC txheej txheem. Nrog nws qhov pib zoo tshaj plaws pib ntawm qis amperage, cerium tungsten yog nrov nyob rau hauv daim ntawv thov xws li cov raj tsheb ciav hlau thiab kev tsim cov yeeb nkab, cov ntawv hlau ua, thiab ua haujlwm nrog cov khoom me me thiab meej. Zoo li thorium, nws yog qhov siv tau zoo tshaj plaws rau vuam carbon hlau, stainless hlau, npib tsib xee alloy thiab titanium. Hauv qee kis, nws tuaj yeem hloov 2% thorium electrodes. Cov khoom siv hluav taws xob ntawm cerium tungsten thiab thorium sib txawv me ntsis, tab sis feem ntau cov kws siv hlau tsis tuaj yeem paub qhov txawv ntawm lawv.
Kev siv lub siab amperage cerium electrode ntau dua tsis pom zoo, vim tias qhov amperage siab dua yuav ua rau cov oxide txav mus rau qhov kub kom sai, tshem cov ntsiab lus oxide thiab ua rau cov txheej txheem tsis zoo.
Siv cov lus taw qhia thiab/lossis cov lus qhia luv luv (rau cov tungsten ntshiab, 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% 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 ua tau zoo, muaj qhov kub hnyiab tsawg, zoo arc ruaj khov thiab cov yam ntxwv kav ntev-ntau yam zoo ib yam li cerium electrodes. Lanthanide electrodes kuj muaj cov yam ntxwv ua tau zoo ntawm 2% thorium tungsten. Hauv qee kis, 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 muaj peev xwm vuam siv tau zoo, 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 wave fais fab mov. Lanthanum thiab tungsten tuaj yeem tuav cov lus qhia tau zoo heev, uas yog qhov zoo rau kev vuam hlau thiab cov hlau tsis muaj zog ntawm DC lossis AC siv lub zog yoj plaub fab.
Tsis zoo li thorium tungsten, cov hluav taws xob no haum rau AC vuam thiab, zoo li cerium electrodes, tso cai rau arc pib thiab tswj hwm ntawm qhov qis dua. Piv nrog tungsten ntshiab, rau qhov muab cov hluav taws xob loj, qhov ntxiv ntawm lanthanum oxide ua rau muaj peev xwm nqa tau ntau tshaj tam sim no kwv yees li 50%.
Zirconium tungsten electrode (AWS classification EWZr-1) muaj tsawg kawg 99.10% tungsten thiab 0.15% mus rau 0.40% zirconium. Zirconium tungsten electrode tuaj yeem tsim qhov ruaj khov heev thiab tiv thaiv tungsten spatter. Nws yog qhov kev xaiv zoo tshaj plaws rau AC vuam vim nws khaws cov lus qhia kheej kheej thiab muaj cov kab mob sib kis tau zoo. Nws lub peev xwm nqa tam sim no yog sib npaug lossis ntau dua li thorium tungsten. Nws tsis pom zoo kom siv zirconium rau DC vuam nyob hauv ib qho xwm txheej twg.
Lub ntiaj teb tungsten electrode tsis tshua muaj neeg pom (AWS kev faib tawm EWG) muaj cov yam ntxwv tsis tshua pom lub ntiaj teb oxide ntxiv lossis sib xyaw ua ke ntawm cov sib txawv oxides, tab sis cov chaw tsim khoom xav tau qhia txhua qhov ntxiv thiab nws feem pua ​​ntawm pob. Nyob ntawm qhov ntxiv, qhov xav tau tshwm sim tuaj yeem suav nrog tsim kom muaj kev ruaj khov thaum lub sijhawm AC thiab DC cov txheej txheem, lub neej ntev dua li thorium tungsten, muaj peev xwm siv cov kab hluav taws xob me me nyob hauv tib txoj haujlwm, thiab siv cov hluav taws xob zoo sib xws loj 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 qhov kev xaiv yog kheej kheej, taw qhia thiab txiav luv.
Cov lus qhia kheej kheej feem ntau yog siv rau cov tungsten ntshiab thiab zirconium electrodes thiab tau pom zoo rau AC cov txheej txheem ntawm sine yoj thiab ib txwm siv plaub fab xwm txheej yoj GTAW tshuab. Txhawm rau ua kom raug qhov kawg ntawm tungsten, tsuas yog siv AC tam sim no pom zoo rau qhov muab cov kab hluav taws xob tso rau (saib daim duab 1), thiab lub pob yuav tsim nyob rau thaum kawg ntawm cov hluav taws xob.
Txoj kab uas hla ntawm qhov kawg yuav tsum tsis pub ntau tshaj 1.5 npaug ntawm txoj kab hluav taws xob (piv txwv li, 1/8-inch electrode yuav tsum tsim 3/16-inch inch kawg). Ib qho loj dua ntawm qhov taub ntawm cov electrode txo qis kev ruaj ntseg. Nws kuj tseem tuaj yeem poob thiab ua rau lub weld tsis huv.
Cov lus qhia thiab/lossis cov lus qhia luv (rau tungsten ntshiab, cerium, lanthanum thiab hom thorium) tau siv hauv inverter AC thiab DC vuam txheej txheem.
Txhawm rau zom cov tungsten kom raug, siv lub log sib tsoo tshwj xeeb tsim los rau kev sib tsoo tungsten (txhawm rau tiv thaiv kev sib kis) thiab lub log sib tsoo ua los ntawm borax lossis pob zeb diamond (kom tiv taus qhov tawv ntawm tungsten). Nco tseg: Yog tias koj tab tom sib tsoo thorium tungsten, thov nco ntsoov tswj thiab khaws cov hmoov av; qhov chaw sib tsoo muaj qhov tsim nyog qhov cua; thiab ua raws cov chaw tsim khoom cov lus ceeb toom, cov lus qhia thiab MSDS.
Sib tsoo tungsten ncaj qha rau ntawm lub log ntawm 90 degree lub kaum ntse ntse (saib daim duab 2) kom ntseeg tau tias cov ntawv sib tsoo nthuav dav raws qhov ntev ntawm cov hluav taws xob. Ua li ntawd tuaj yeem txo qhov muaj ntawm ntug ntawm tungsten, uas tuaj yeem ua rau cov dej ntws los yog yaj mus rau hauv pas dej txuas, ua rau muaj kev sib kis.
Feem ntau, koj xav zom cov taper ntawm tungsten kom tsis pub ntau tshaj 2.5 npaug ntawm txoj kab hluav taws xob (piv txwv li, rau 1/8-inch electrode, hauv av yog 1/4 txog 5/16 ntiv tes ntev). Kev sib tsoo tungsten rau hauv lub khob tuaj yeem ua kom yooj yim hloov pauv ntawm arc pib, thiab tsim kom muaj kev sib koom ua ke ntau dua, thiaj li kom tau txais kev ua haujlwm tau zoo dua.
Thaum vuam ntawm cov ntaub ntawv nyias (0.005 txog 0.040 ntiv) ntawm qhov tam sim no, nws yog qhov zoo tshaj los zom cov tungsten mus rau ib qho. Cov lus tso cai rau vuam tam sim no kom xa mus rau qhov tsom mus rau lub ntsej muag thiab pab tiv thaiv kev deformation ntawm cov hlau nyias xws li txhuas. Nws tsis pom zoo siv tungsten taw qhia rau daim ntawv thov siab dua tam sim no vim tias qhov siab dua tam sim no yuav tshuab tawm qhov taub ntawm tungsten thiab ua rau muaj kev sib kis ntawm lub pas dej txuas.
Rau cov ntawv thov tam sim no siab dua, nws yog qhov zoo tshaj los zom cov lus txiav. Txhawm rau kom tau cov duab no, tungsten yog thawj lub hauv paus rau lub taper piav qhia saum toj no, thiab tom qab ntawd hauv av mus rau 0.010 txog 0.030 ntiv tes. Tiaj tiaj tiaj qhov kawg ntawm tungsten. Cov av tiaj tus no pab tiv thaiv tungsten los ntawm kev hla mus rau hauv lub arc. Nws tseem tiv thaiv kev tsim cov pob.
WELDER, yav tas los hu ua Kev Siv Vuam Niaj Hnub no, nthuav tawm cov neeg tiag tiag uas tsim cov khoom peb siv thiab ua haujlwm txhua hnub. Cov ntawv xov xwm no tau ua haujlwm pabcuam cov neeg nyob hauv North America rau ntau dua 20 xyoo.


Sijhawm Tshaj Tawm: Aug-23-2021