Khokahano e tobileng ea hona joale ke efe, khokahano e tobileng ea morao-rao ke efe, le mokhoa oa ho khetha ha u cheselletsa

1. Khokahano ea pele ea DC (e leng mokhoa oa khokahanyo ea pele):

Mokhoa oa ho hokahanya o ka pele o bolela mokhoa oa wiring o sebelisetsoang ho lekanya ntlha ea tahlehelo ea dielectric tekong ea potoloho ea borokho ba Xilin. Ntho ea tahlehelo ea dielectric e lekantsoeng ka mokhoa oa khokahanyo ea pele e nyenyane, 'me ntlha ea tahlehelo ea dielectric e lekantsoeng ka mokhoa oa ho kopanya ka morao e kholo. Ha ho bapisoa le mokhoa oa ho hokahanya ka morao, mokhoa oa ho hokahanya o ka pele o ka fokotsa ka katleho phello ea antihalo layer surface resistance holim'a boleng ba tlhahlobo ea tahlehelo ea dielectric.

2. Khokahano ea reverse ea DC (e leng mokhoa oa khokahanyo ea reverse):

E bua ka mokhoa oa ho hokahanya ha potoloho nakong ea welding. Ka tungsten arc welding, DC reverse connection e na le phello ea ho tlosa filimi ea oxide, e bitsoang "cathode fragmentation" kapa "cathode atomization".

Phello ea ho tlosa lifilimi tsa oxide e boetse e teng ho reverse polarity half-wave ea AC welding. Ke ntho ea bohlokoa ho tjheseletsa aluminium ka katleho, magnesium le lisebelisoa tsa bona.

3. Ha o tjheseletsa, o hloka ho khetha ka ho khetheha khokahanyo ea DC ea pele kapa khokahanyo ea reverse ea DC ho latela litlhoko tsa lisebelisoa tsa ho tjheseletsa.

Ho itloaetsa ho ipakile hore ha DC e hokahane ka mokhoa o fapaneng, filimi ea oxide e holim'a sebaka sa mosebetsi e ka tlosoa tlas'a ketso ea arc ho fumana weld e khanyang, e ntle le e entsoeng hantle. Haeba molamu oa terata o ka aroloa fatše, tlhahlobo ea setšeng e lokela ho sebelisa mokhoa o motle oa ho hokahanya ka hohle kamoo ho ka khonehang.

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Boitsebiso bo atolositsoeng

Molao-motheo oa DC reverse connection:
Ha DC e khutlisetsoa morao, filimi ea oxide e holim'a sebaka sa mosebetsi se ka tlosoa tlas'a ketso ea arc ho fumana weld e khanyang, e ntle le e entsoeng hantle.

Lebaka ke hobane li-oxide tsa tšepe li na le mesebetsi e menyenyane ea mosebetsi 'me li ntša li-electrone habonolo, kahoo matheba a cathode a bonolo ho theha filimi ea oxide le ho hlahisa li-arcs. Matheba a cathode a na le thepa ea ho batla li-oxide tsa tšepe ka bo eona.

Matla a matla a sebaka sa cathode a phahame haholo, 'me a otloa ke li-ion tse ntle tse nang le boima bo boholo, tse senyang filimi ea oxide.

Leha ho le joalo, phello ea mocheso ea khokahanyo ea reverse ea DC e kotsi ho welding, hobane anode ea tungsten argon arc welding e chesa ho feta cathode. Ha polarity e khutlisetsoa morao, lielektrone li otla electrode ea tungsten ebe li ntša mocheso o mongata, o ka futhumatsang habonolo le ho qhibilihisa electrode ea tungsten. Nakong ena, haeba motlakase oa 125A o tla fetisoa, ho hlokahala molamu oa tungsten o bophara ba 6mm ho thibela electrode ea tungsten ho qhibiliha.

Ka nako e ts'oanang, hobane ha ho na matla a mangata a lokolloang holim'a cheseletso, botebo ba ho kenella ha weld ha bo teba ebile bo pharaletse, tlhahiso e tlase, 'me ke lipoleiti tsa aluminium tse ka bang 3mm tse teteaneng feela tse ka chesetsoang. Ka hona, khokahanyo ea reverse ea DC ha e sebelisoe hangata ho tungsten arc welding ntle le aluminium ea welding le lipoleiti tse tšesaane tsa magnesium.