Nyob rau hauv kev xyaum ntau lawm, alternating tam sim no feem ntau yog siv thaum welding aluminium, magnesium thiab lawv alloys, yog li ntawd nyob rau hauv tus txheej txheem ntawm alternating tam sim no vuam, thaum lub workpiece yog lub cathode, nws muaj peev xwm tshem tawm cov oxide zaj duab xis, uas yuav tshem tawm cov oxide zaj duab xis tsim nyob rau hauv lub workpiece. qhov chaw ntawm lub pas dej molten;tungsten yog heev thaum siv cathode, tungsten electrode tuaj yeem ua kom txias, thiab tib lub sijhawm, cov khoom siv hluav taws xob txaus tuaj yeem tso tawm, uas yog qhov tsim nyog rau kev ruaj ntseg ntawm lub arc, kom ob leeg tuaj yeem coj mus rau hauv tus account, thiab vuam. txheej txheem tuaj yeem ua tiav.
Txawm li cas los xij, thaum siv AC lub zog, cov teeb meem hauv qab no kuj tshwm sim: Ua ntej, nws yuav tsim ib qho DC tivthaiv, uas yog teeb meem;thib ob, lub zog AC hla dhau qhov xoom taw tes 100 zaug ib ob, thiab ntsuas arc stabilization yuav tsum tau ua.
Cov hauv qab no feem ntau qhia txog tiam thiab tshem tawm ntawm DC tivthaiv.
Nyob rau hauv cov ntaub ntawv ntawm AC arc, vim qhov sib txawv ntawm cov hluav taws xob thiab thermal lub cev thiab geometric qhov ntev ntawm cov electrode thiab lub hauv paus hlau, lub arc kem conductivity, hluav taws xob siv zog thiab arc voltage nyob rau hauv ob ib nrab voj voog ntawm AC tam sim no. asymmetrical, ua rau arc tam sim no Tsis tas li symmetrical.Nyob rau hauv ib nrab voj voog ntawm tungsten ncej cathode, conductivity ntawm arc kem yog siab, qhov hluav taws xob teb siv me me, lub arc voltage yog tsawg thiab tam sim no loj;nyob rau hauv ib nrab lub voj voog thaum lub hauv paus hlau yog lub cathode, qhov teeb meem tsuas yog qhov opposite, lub arc voltage yog siab thiab tam sim no me me.Vim tias qhov tsis sib xws ntawm qhov tam sim no hauv ob lub voj voog ib nrab, qhov tam sim no ntawm AC arc tuaj yeem suav tias yog tsim los ntawm ob ntu, ib qho yog AC tam sim no, thiab lwm qhov yog DC tam sim no superimposed ntawm AC, thiab tom kawg. yog DC tivthaiv.Qhov tshwm sim uas DC tivthaiv yog tsim nyob rau hauv AC arc yog hu ua rectification nyhuv ntawm tungsten AC argon arc vuam.Cov nyhuv rectification no tsis tsuas yog tshwm sim thaum lub sij hawm AC TIG vuam ntawm txhuas, tab sis kuj tshwm sim thaum lub cev khoom ntawm ob cov ntaub ntawv electrode sib txawv heev.Qhov teeb meem no kuj tshwm sim thaum vuam alloys xws li tooj liab thiab magnesium nrog AC.Txawm hais tias cov khoom siv tib yam siv rau AC vuam, vim qhov sib txawv ntawm cov electrode thiab workpiece geometry thiab cov cua kub dissipation tej yam kev mob, yuav muaj ib tug DC tivthaiv, tab sis tus nqi yog heev me me thiab tsis cuam tshuam rau ib txwm ua hauj lwm ntawm cov khoom.
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Yog tias cov khoom siv hluav taws xob thiab cov thermophysical ntawm lub hauv paus hlau thiab cov electrode txawv, qhov asymmetry saum toj no yuav loj dua, thiab DC tivthaiv yuav loj dua.Ntawm qhov tsis sib xws, cov khoom siv hluav taws xob thiab thermophysical ntawm lub hauv paus hlau thiab cov electrode tsis txawv ntau, thiab qhov sib txawv ntawm cov cua sov dissipation ntawm ob tsuas yog tshwm sim los ntawm qhov sib txawv geometric qhov ntev, thiab cov nyhuv rectification tsis pom tseeb.Piv txwv li, hauv MIG vuam, vuam hlau thiab cov khoom ua haujlwm feem ntau yog ua los ntawm tib yam khoom, yog li cov lus hais saum toj no tsis pom tseeb, thiab cov khoom siv DC me me tuaj yeem tsis quav ntsej.
Cov kev taw qhia ntawm DC tivthaiv yog tib yam li cov kev taw qhia tam sim no nyob rau hauv ib nrab voj voog ntawm tungsten ncej cathode, ntws los ntawm cov khoom siv hauv paus mus rau tungsten ncej, uas yog sib npaug rau qhov zoo DC fais fab mov hauv Circuit Court thaum vuam.Vim tias muaj cov DC tivthaiv, thawj zaug, kev tshem tawm cov oxide zaj duab xis los ntawm cathode yuav tsis muaj zog, thiab qhov thib ob, ib feem ntawm DC magnetic flux yuav raug tsim nyob rau hauv cov tub ntxhais hlau ntawm lub vuam transformer, thiab qhov no yog ib feem ntawm DC magnetic flux. DC magnetic flux yuav superimposed ntawm thawj alternating magnetic flux, ua rau cov hlau Cov tub ntxhais yuav ncav cuag magnetic saturation nyob rau hauv ib qho kev taw qhia, uas ua rau ib tug loj nce nyob rau hauv transformer excitation tam sim no.Nyob rau hauv txoj kev no, ntawm ib sab, cov hlau poob thiab tooj liab poob ntawm lub transformer yuav nce, efficiency yuav txo, thiab kub yuav nce;Ntawm qhov tod tes, lub waveform ntawm cov vuam tam sim no yuav raug cuam tshuam loj heev, thiab lub zog yuav raug txo.Cov no yuav muaj kev cuam tshuam tsis zoo rau qhov ruaj khov combustion ntawm arc.
Post lub sij hawm: May-08-2023
