Kuyini ukuxhumana okuqondile kwamanje, kuyini ukuxhumana okuqondile kwamanje, nokuthi ungakhetha kanjani lapho ushisela

1. Uxhumano oluya phambili lwe-DC (okungukuthi indlela yokuxhumana eya phambili):

Indlela yokuxhuma phambili ibhekisela endleleni yezintambo ezisetshenziselwa ukukala isici sokulahlekelwa kwe-dielectric ekuhlolweni kwesifunda sebhuloho le-Xilin. Isici sokulahlekelwa kwe-dielectric esilinganiswa ngendlela yokuxhuma phambili sincane, futhi isici sokulahlekelwa kwe-dielectric esikalwa ngendlela yokuxhumeka okuphambene sikhulu. Uma kuqhathaniswa nendlela yokuxhumeka okubuyela emuva, indlela yokuxhuma phambili inganciphisa ngempumelelo umthelela wokumelana nongqimba lwe-antihalo ku-dielectric loss factor test value.

2. Uxhumano lwe-DC reverse (okungukuthi indlela yokuhlehla yokuxhuma):

Kubhekiselwa endleleni yokuxhumana kwesekethe ngesikhathi sokushisela. Ku-tungsten arc welding, uxhumano lwe-DC reverse lunomthelela wokukhipha ifilimu ye-oxide, ebizwa ngokuthi "i-cathode fragmentation" noma "i-cathode atomization".

Umthelela wokukhipha amafilimu e-oxide nawo ukhona ku-reverse polarity half-wave ye-AC welding. Kuyisici esibalulekile ekushiseleni ngempumelelo i-aluminium, i-magnesium nama-alloys awo.

3. Lapho ushisela, udinga ukukhetha ngokuqondile uxhumano lwe-DC phambili noma uxhumano lwe-DC reverse ngokuvumelana nezidingo zezinto zokushisela.

Ukuzijwayeza kufakazele ukuthi lapho i-DC ixhunywe ngokuphambene, ifilimu ye-oxide ebusweni bomsebenzi womsebenzi ingasuswa ngaphansi kwesenzo se-arc ukuze kutholwe i-weld ekhanyayo, enhle futhi eyakhiwe kahle. Uma intambo yocingo ingahlukaniswa phansi, ukuhlolwa okusendaweni kufanele kusebenzise indlela yokuxhumana eqondile ngangokunokwenzeka.

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Ulwazi olunwetshiwe

Umgomo wokuxhumeka kwe-DC reverse:
Lapho i-DC iguqulwa, ifilimu ye-oxide ebusweni bomsebenzi womsebenzi ingasuswa ngaphansi kwesenzo se-arc ukuthola i-weld ekhanyayo, enhle futhi eyakhiwe kahle.

Lokhu kungenxa yokuthi ama-oxide ensimbi anemisebenzi emincane yokusebenza futhi akhipha ama-electron kalula, ngakho-ke amabala e-cathode kulula ukwakheka kufilimu ye-oxide futhi akhiqize ama-arcs. Amabala e-cathode anempahla yokusesha ngokuzenzakalelayo ama-oxide ensimbi.

Ubuningi bamandla bendawo ye-cathode buphezulu kakhulu, futhi ishaywa ama-ion amahle anesisindo esikhulu, esiphula ifilimu ye-oxide.

Kodwa-ke, umphumela wokushisa wokuxhuma kwe-DC reverse uyingozi ekushiseleni, ngoba i-anode ye-tungsten argon welding welding ishisa kakhulu kune-cathode. Lapho i-polarity ihlehliswa, ama-electron aqhumisa i-electrode ye-tungsten futhi akhulule inani elikhulu lokushisa, elingashisisa kalula futhi lincibilike i-electrode ye-tungsten. Ngalesi sikhathi, uma i-welding current engu-125A izodluliswa, induku ye-tungsten enobubanzi obungaba ngu-6mm iyadingeka ukuze kuvinjelwe i-electrode ye-tungsten ekuncibilikeni.

Ngesikhathi esifanayo, ngenxa yokuthi awekho amandla amaningi akhishwe ekushiseleni, ukujula kokungena kwe-weld akujulile futhi kubanzi, ukukhiqiza kuphansi, futhi amapuleti e-aluminium angu-3mm kuphela angashiselwa. Ngakho-ke, ukuxhumana okuhlanekezela kwe-DC akuvamile ukusetshenziswa ekushiseleni i-tungsten arc ngaphandle kwe-aluminium yokushisela namapuleti amancane e-magnesium.