Qhov txawv ntawm TIG (DC) thiab TIG (AC) yog dab tsi?
Direct tam sim no TIG (DC) vuam yog thaum tam sim no ntws hauv ib qho kev taw qhia nkaus xwb.Piv nrog AC (Alternating Tam sim no) TIG vuam qhov tam sim no ib zaug ntws yuav tsis mus rau xoom kom txog thaum vuam xaus.Feem ntau TIG inverters yuav muaj peev xwm welding yog DC los yog AC / DC vuam nrog ob peb lub cav yog AC nkaus xwb.
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DC yog siv rau TIG vuam Mild Steel/Stainless khoom thiab AC yuav siv rau vuam Aluminium.
Polarity
TIG vuam txheej txheem muaj peb txoj kev xaiv ntawm vuam tam sim no raws li hom kev sib txuas.Txhua txoj kev sib txuas muaj qhov zoo thiab qhov tsis zoo.
Direct Tam sim no - Electrode Negative (DCEN)
Txoj kev vuam no tuaj yeem siv rau ntau yam khoom siv.Lub TIG welding torch txuas nrog qhov tsis zoo ntawm cov khoom siv hluav taws xob thiab cov khoom siv rov qab mus rau qhov zoo tso zis.
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Thaum lub arc raug tsim, tam sim no ntws nyob rau hauv Circuit Court thiab lub tshav kub faib nyob rau hauv lub arc yog nyob ib ncig ntawm 33% nyob rau hauv lub tsis zoo sab ntawm lub arc (lub vuam teeb) thiab 67% nyob rau hauv lub zoo sab ntawm lub arc (lub workpiece).
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Qhov kev sib npaug no muab qhov sib sib zog nqus arc nkag ntawm arc rau hauv cov khoom ua haujlwm thiab txo cov cua sov hauv electrode.
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Qhov no txo cov cua sov hauv electrode tso cai rau tam sim no ntau dua los ntawm cov electrodes me me piv rau lwm qhov kev sib txuas polarity.Txoj kev sib txuas no feem ntau hu ua ncaj polarity thiab yog qhov kev sib txuas feem ntau siv hauv DC vuam.
Direct Tam sim no - Electrode Positive (DCEP)
Thaum welding nyob rau hauv hom no lub TIG welding torch yog txuas nrog rau qhov zoo tso zis ntawm lub vuam inverter thiab cov hauj lwm rov qab cable rau cov zis tsis zoo.
Thaum lub arc raug tsim, tam sim no ntws nyob rau hauv Circuit Court thiab lub tshav kub faib nyob rau hauv lub arc yog nyob ib ncig ntawm 33% nyob rau hauv lub tsis zoo sab ntawm lub arc (cov khoom ua hauj lwm) thiab 67% nyob rau hauv lub zoo sab ntawm lub arc ( vuam torch).
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Qhov no txhais tau hais tias cov electrode raug rau qhov kub siab tshaj plaws thiab yog li ntawd yuav tsum loj dua nrog DCEN hom txawm tias qhov tam sim no tsis tshua muaj los tiv thaiv electrode overheating lossis melting.Cov khoom ua haujlwm tau raug rau qhov qis qis kom qhov kev nkag mus ntawm vuam yuav ntiav.
Txoj kev sib txuas no feem ntau hu ua rov qab polarity.
Tsis tas li ntawd, nrog rau hom no, cov teebmeem ntawm cov hlau nplaum tuaj yeem ua rau muaj kev tsis ruaj khov thiab qhov tshwm sim hu ua arc tshuab qhov twg arc tuaj yeem khiav ntawm cov ntaub ntawv yuav tsum tau welded.Qhov no kuj tuaj yeem tshwm sim hauv DCEN hom tab sis muaj ntau dua hauv DCEP hom.
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Tej zaum nws yuav raug nug dab tsi siv yog hom no thaum vuam.Qhov laj thawj yog vim li cas qee cov ntaub ntawv uas tsis yog ferrous xws li txhuas nyob rau hauv ib txwm raug rau huab cua tsim ib qho oxide ntawm qhov chaw.Qhov oxide no yog tsim los ntawm cov tshuaj tiv thaiv ntawm cov pa hauv huab cua thiab cov khoom zoo ib yam li xeb ntawm hlau.Txawm li cas los xij, cov oxide no nyuaj heev thiab muaj qhov taw tes melting ntau dua li cov khoom siv tiag tiag thiab yog li yuav tsum tau muab tshem tawm ua ntej vuam tuaj yeem nqa tawm.
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Cov oxide yuav raug tshem tawm los ntawm kev sib tsoo, txhuam hniav lossis qee yam tshuaj ntxuav tab sis sai li sai tau thaum cov txheej txheem ntxuav tas lawm cov oxide pib rov tsim dua.Yog li ntawd, qhov zoo tshaj plaws nws yuav raug ntxuav thaum vuam.Qhov kev cuam tshuam no tshwm sim thaum qhov tam sim no ntws hauv DCEP hom thaum lub electron ntws yuav tawg thiab tshem tawm cov oxide.Yog li nws tuaj yeem xav tias DCEP yuav yog hom zoo tshaj plaws rau vuam cov ntaub ntawv nrog hom oxide txheej no.Hmoov tsis zoo vim qhov raug ntawm electrode mus rau qhov kub siab hauv hom no, electrodes loj yuav tsum loj thiab arc nkag mus yuav tsawg.
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Qhov kev daws teeb meem rau cov khoom siv no yuav yog qhov tob tob ntawm DCEN hom ntxiv rau kev ntxuav ntawm DCEP hom.Yuav kom tau txais cov txiaj ntsig no siv AC vuam hom.
Alternating Current (AC) Vuam
Thaum vuam hauv AC hom tam sim no muab los ntawm vuam inverter ua haujlwm nrog cov ntsiab lus zoo thiab tsis zoo lossis ib nrab voj voog.Qhov no txhais tau hais tias tam sim no ntws ib txoj kev thiab tom qab ntawd lwm lub sijhawm sib txawv yog li siv lub sijhawm hloov pauv tam sim no.Kev sib xyaw ua ke ntawm ib qho zoo thiab ib qho tsis zoo yog hu ua ib lub voj voog.
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Tus naj npawb ntawm lub voj voog ua tiav hauv ib lub thib ob yog hu ua qhov zaus.Nyob rau hauv UK qhov zaus ntawm kev hloov tam sim no muab los ntawm lub mains network yog 50 cycles ib ob thiab yog denoted li 50 Hertz (Hz)
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Qhov no txhais tau tias tam sim no hloov pauv 100 zaug txhua thib ob.Tus naj npawb ntawm cov voj voog ib ob (ntau zaus) nyob rau hauv lub tshuab txheem yog dictated los ntawm lub mains zaus uas nyob rau hauv lub UK yog 50Hz.
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Nws yog ib nqi sau cia hais tias raws li qhov zaus ua rau cov magnetic cuam tshuam nce thiab cov khoom xws li transformers ua tau zoo dua.Tsis tas li ntawd nce qhov zaus ntawm qhov vuam tam sim no stiffens lub arc, txhim kho arc stability thiab ua rau muaj kev tswj tau ntau dua vuam.
Txawm li cas los xij, qhov no yog theoretical zoo li thaum vuam hauv TIG hom muaj lwm yam cuam tshuam rau ntawm arc.
AC sine yoj tuaj yeem cuam tshuam los ntawm oxide txheej ntawm qee cov ntaub ntawv uas ua raws li lub rectifier txwv cov electron ntws.Qhov no yog hu ua arc rectification thiab nws cov nyhuv ua rau qhov zoo ib nrab voj voog yuav raug txiav tawm los yog distorted.Cov nyhuv rau thaj tsam weld yog qhov tsis zoo ntawm qhov arc, tsis muaj kev tu thiab ua kom puas tungsten.
Arc rectification ntawm qhov zoo ib nrab voj voog
Hloov tam sim no (AC) Waveforms
Sine Wave
Lub sinusoidal nthwv dej muaj cov ntsiab lus zoo tsim kom nws qhov siab tshaj plaws ntawm xoom ua ntej poob rov qab mus rau xoom (feem ntau hu ua toj).
Raws li nws hla xoom thiab tam sim no hloov kev coj mus rau nws qhov siab tshaj qhov tsis zoo ua ntej ces nce mus rau xoom (feem ntau hu ua hav) ib lub voj voog tiav.
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Ntau tus qub style TIG welders tsuas yog sine yoj hom tshuab.Nrog rau txoj kev loj hlob ntawm niaj hnub vuam inverters nrog cov khoom siv hluav taws xob ntau dua tuaj yeem txhim kho ntawm kev tswj thiab shaping ntawm AC waveform siv rau vuam.
Lub Square Wave
Nrog rau kev txhim kho ntawm AC / DC TIG vuam inverters kom suav nrog ntau cov khoom siv hluav taws xob ib tiam ntawm cov tshuab square yoj tau tsim.Vim tias cov hluav taws xob tswj kev hla dhau los ntawm qhov zoo mus rau qhov tsis zoo thiab rov ua dua tuaj yeem ua rau yuav luag nyob rau hauv ib qho instant uas ua rau muaj txiaj ntsig zoo dua nyob rau hauv txhua lub voj voog ib nrab vim lub sijhawm ntev ntawm qhov siab tshaj plaws.
Kev siv tau zoo ntawm cov khoom siv hluav taws xob sib nqus uas khaws cia tsim cov waveforms uas nyob ze heev square.Cov kev tswj hwm ntawm thawj lub zog hluav taws xob tau tso cai rau kev tswj hwm ntawm 'square yoj'.Lub kaw lus yuav tso cai rau kev tswj xyuas qhov zoo (ntxuav) thiab qhov tsis zoo (kev nkag mus) ib nrab voj voog.
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Qhov kev tshuav nyiaj li cas yuav sib npaug + zoo thiab tsis zoo ib nrab voj voog muab qhov kev ruaj ntseg weld.
Cov teeb meem uas tuaj yeem ntsib yog tias ib zaug ntxuav tau tshwm sim tsawg dua li lub sijhawm zoo ib nrab lub voj voog ces qee qhov zoo ib nrab lub voj voog tsis ua haujlwm thiab tuaj yeem ua rau muaj kev puas tsuaj rau cov electrode vim overheating.Txawm li cas los xij, hom tshuab no kuj tseem yuav muaj kev tswj xyuas qhov sib npaug uas tso cai rau lub sijhawm ntawm qhov zoo ib nrab ntawm lub voj voog sib txawv hauv lub sijhawm voj voog.
Kev nkag siab siab tshaj plaws
Qhov no tuaj yeem ua tiav los ntawm kev tso cov kev tswj hwm mus rau txoj haujlwm uas yuav ua rau muaj sijhawm ntau dua los siv rau hauv qhov tsis zoo ib nrab voj voog nrog kev hwm rau qhov zoo ib nrab voj voog.Qhov no yuav tso cai rau kom muaj zog dua tam sim no siv nrog cov electrodes me dua
ntawm tshav kub yog nyob rau hauv qhov zoo (ua hauj lwm).Qhov nce hauv tshav kub kuj ua rau kev nkag mus tob dua thaum vuam ntawm tib qhov kev mus los nrawm raws li qhov sib npaug.
Ib qho kev txo cua sov cuam tshuam rau cheeb tsam thiab tsawg dua distortion vim qhov nqaim arc.
Kev tu siab tshaj plaws
Qhov no tuaj yeem ua tiav los ntawm kev tso cov kev tswj hwm mus rau txoj haujlwm uas yuav ua rau muaj sijhawm ntau dua los siv rau hauv qhov zoo ib nrab voj voog nrog kev hwm rau qhov tsis zoo ib nrab voj voog.Qhov no yuav tso cai rau siv cov tshuaj ntxuav tam sim no.Nws yuav tsum raug sau tseg tias muaj lub sijhawm tu kom zoo tom qab qhov kev tu ntau dua yuav tsis tshwm sim thiab lub peev xwm ntawm kev puas tsuaj rau electrode ntau dua.Cov nyhuv ntawm lub arc yog muab lub pas dej ua kom huv si nrog qhov tob tob.
Post lub sij hawm: Dec-27-2021