Ka tlhahiso ea tlhahiso, alternating jwale e sebediswa ka kakaretso ha tjheseletsa aluminium, magnesium le alloys bona, e le hore tshebetso ya ho chenchana tjheseletsa hona joale, ha workpiece ke cathode, e ka tlosa oxide filimi, e ka tlosa oxide filimi thehoa ka. bokaholimo ba letamo le entsoeng ka ho qhibilihisoa; tungsten e feteletseng Ha cathode e sebelisoa, electrode ea tungsten e ka pholile, 'me ka nako e ts'oanang, li-electrone tse lekaneng li ka ntšoa, e leng se loketseng ho tsitsisa ha arc, e le hore ka bobeli li ka tsotelloa, le ho cheselletsa. tshebetso e ka tsoela pele hantle.
Leha ho le joalo, ha u sebelisa matla a AC, mathata a latelang a boetse a hlaha: Pele, e tla hlahisa karolo ea DC, e leng kotsi; ea bobeli, matla a AC a feta sebakeng sa zero ka makhetlo a 100 ka motsotsoana, 'me mehato ea ho tsitsisa arc e tlameha ho nkoa.
Tse latelang haholo-holo li hlahisa tlhahiso le pheliso ea karolo ea DC.
Tabeng ea AC arc, ka lebaka la phapang ea thepa ea motlakase le ea mocheso le litekanyo tsa geometric tsa electrode le tšepe ea motheo, arc column conductivity, matla a tšimo ea motlakase le arc voltage ka mekhahlelo e 'meli ea AC hona joale. asymmetrical, ho etsa hore arc current Hape e se be symmetrical. Halofo ea potoloho ea tungsten pole cathode, conductivity ea arc column e phahame, matla a motlakase a matla a nyenyane, arc voltage e tlaase 'me hona joale e kholo; ka halofo ea potoloho ha tšepe botlaaseng ke cathode, boemo e mpa e le ka tsela e fapaneng, arc gagamalo e phahameng 'me hona joale e nyenyane. Ka lebaka la asymmetry ea hona joale lipotolohong tse peli tsa halofo, hona joale ha arc ea AC e ka nkuoa e entsoe ka likarolo tse peli, e 'ngoe ke ea AC ea hajoale,' me e 'ngoe ke ea hona joale ea DC e kentsoeng karolong ea AC,' me ea morao-rao ke ea morao-rao. ke karolo ea DC. Ketsahalo ea hore karolo ea DC e hlahisoa ka har'a AC arc e bitsoa phello ea tokiso ea tungsten AC argon arc welding. Phello ena ea tokiso ha e fumanehe feela nakong ea AC TIG welding ea aluminium, empa hape e etsahala ha thepa ea 'mele ea lisebelisoa tse peli tsa elektrode e fapane haholo. Bothata bona bo boetse bo teng ha li-alloys tsa welding tse kang koporo le magnesium e nang le AC. Esita le ha thepa e tšoanang e sebelisoa bakeng sa ho tjheseletsa AC, ka lebaka la phapang pakeng tsa electrode le workpiece geometry le maemo a ho senya mocheso, ho tla ba le karolo ea DC, empa boleng bo nyenyane haholo 'me ha bo ame ts'ebetso e tloaelehileng ea thepa.
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Haeba lisebelisoa tsa motlakase le tsa thermophysical tsa tšepe ea motheo le electrode li fapane, li-asymmetry tse boletsoeng ka holimo li tla ba tse tebileng haholoanyane, 'me karolo ea DC e tla ba kholoanyane. Ho e-na le hoo, thepa ea motlakase le ea thermophysical ea tšepe ea motheo le electrode ha e fapane haholo, 'me phapang ea ho senya mocheso pakeng tsa tse peli e bakoa feela ke litekanyo tse fapaneng tsa geometri,' me phello ea ho lokisa ha e totobetse. Ka mohlala, ka MIG welding, terata ea welding le workpiece hangata li entsoe ka thepa e tšoanang, kahoo asymmetry e boletsoeng ka holimo ha e totobetse, 'me karolo e nyenyane ea DC e ka hlokomolohuoa.
Tataiso ea karolo ea DC e ts'oana le tataiso ea hajoale ea potoloho ea halofo ea "tungsten pole cathode", e phallang ho tloha motheong ho ea poleiting ea tungsten, e lekanang le phepelo e ntle ea motlakase ea DC ho potoloha nakong ea welding. Ka lebaka la ho ba teng ha karolo ea DC, pele, ho tlosoa ha filimi ea oxide ka cathode ho tla fokola, 'me ea bobeli, karolo ea DC magnetic flux e tla hlahisoa mokokotlong oa tšepe oa transformer ea welding,' me karolo ena the DC magnetic flux tla superimposed holim'a pele alternating magnetic flux, ho etsa tšepe The konokono ka 'na fihla khoheli saturation ka tataiso e le' ngoe, ho fella ka keketseho e kholo ea ho excitation transformer jwale. Ka tsela ena, ka lehlakoreng le leng, tahlehelo ea tšepe le tahlehelo ea koporo ea transformer e tla eketseha, katleho e tla fokotseha, 'me ho phahama ha mocheso ho tla eketseha; ka lehlakoreng le leng, leqhubu la maqhubu a motlakase le tla sotheha haholo, 'me matla a tla fokotseha. Tsena li tla ba le liphello tse mpe ho tukang ho tsitsitseng ha arc.
Nako ea poso: May-08-2023
