Na mmepụta omume, alternating ugbu a na-ejikarị eme ihe mgbe ịgbado ọkụ aluminum, magnesium na ha alloys, nke mere na na usoro nke alternating ugbu a ịgbado ọkụ, mgbe workpiece bụ cathode, ọ nwere ike wepụ oxide film, nke nwere ike wepụ oxide film guzobere na. elu nke ọdọ mmiri a wụrụ awụ; tungsten dị oke oke Mgbe a na-eji cathode, tungsten electrode nwere ike mee ka ọ dị jụụ, n'otu oge ahụ, a na-emepụta electrons zuru ezu, nke na-eme ka nkwụsi ike nke arc ahụ dị mma, nke mere na ha abụọ nwere ike iburu n'uche, na ịgbado ọkụ. usoro nwere ike ịga n'ihu were were.
Otú ọ dị, mgbe ị na-eji ike AC, nsogbu ndị a na-ebilite: Nke mbụ, ọ ga-emepụta akụkụ DC, nke na-emerụ ahụ; nke abụọ, ike AC na-agafe ebe efu 100 ugboro kwa nkeji, na arc stabilization ga-emerịrị.
Ihe na-esonụ na-ebutekarị ọgbọ na mkpochapụ nke akụrụngwa DC.
N'ihe banyere AC arc, n'ihi ọdịiche dị na ọkụ eletrik na ọkụ anụ ahụ na akụkụ geometric nke electrode na metal base, arc kọlụm conductivity, ọkụ ọkụ eletrik na arc voltaji na nkeji abụọ nke ọkara nke AC ugbu a. asymmetrical, na-eme ka arc dị ugbu a Ọ bụghịkwa symmetrical. Na ọkara okirikiri nke tungsten pole cathode, conductivity nke arc kọlụm dị elu, ike ọkụ eletrik dị ntakịrị, voltaji arc dị ala na nke ugbu a dị ukwuu; na ọkara okirikiri mgbe metal ntọala bụ cathode, ọnọdụ dị nnọọ iche, arc voltaji dị elu na ugbu a dị obere. N'ihi asymmetry nke ugbu a na nkeji abụọ nke ọkara cycles, a na-ahụta AC arc dị ugbu a dị ka akụkụ abụọ mejupụtara, otu bụ AC ugbu a, nke ọzọ bụ DC ugbu a na-etinye na akụkụ AC, na nke ikpeazụ. bụ DC akụrụngwa. Ihe a na-eme na mpaghara DC na-emepụta na AC arc bụ nke a na-akpọ mmetụta mmezi nke tungsten AC argon arc welding. Mmetụta mmezi a abụghị naanị n'oge ịgbado ọkụ AC TIG nke aluminom, kamakwa ọ na-eme mgbe njirimara anụ ahụ nke ihe elektrọd abụọ ahụ dị nnọọ iche. Nsogbu a dịkwa mgbe ị na-agbado alloys dị ka ọla kọpa na magnesium nwere AC. Ọbụna mgbe a na-eji otu ihe ahụ maka ịgbado ọkụ AC, n'ihi ọdịiche dị n'etiti electrode na geometry workpiece na ọnọdụ ikpo ọkụ ọkụ, a ga-enwe akụkụ DC, ma uru ahụ dị ntakịrị ma ọ dịghị emetụta ọrụ nkịtị nke akụrụngwa.
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Ọ bụrụ na ihe ọkụ eletrik na thermophysical nke metal base na electrode dị iche, asymmetry ahụ a kpọtụrụ aha n'elu ga-adị njọ karị, akụkụ DC ga-ebuwanye ibu. N'ụzọ megidere nke ahụ, ihe ndị dị na eletriki na thermophysical nke metal base na electrode adịghị iche, na ọdịiche dị na ikpo ọkụ ọkụ dị n'etiti abụọ ahụ bụ nanị ihe dị iche iche geometric kpatara, na mmetụta nhazi adịghị egosi. Dịka ọmụmaatụ, na MIG ịgbado ọkụ, a na-emekarị waya ịgbado ọkụ na workpiece bụ otu ihe, ya mere asymmetry ahụ a kpọtụrụ aha n'elu abụghị ihe doro anya, na enwere ike ileghara obere akụkụ DC anya.
Ntuziaka nke akụkụ DC bụ otu ntụziaka dị ugbu a na ọkara okirikiri nke tungsten pole cathode, na-esi na ihe ndị dị na ya na-aga na tungsten pole, bụ nke kwekọrọ na ọkụ ọkụ DC dị mma na sekit n'oge ịgbado ọkụ. N'ihi ịdị adị nke akụkụ DC, nke mbụ, iwepụ ihe nkiri oxide site na cathode ga-ada mbà, na nke abụọ, a ga-emepụta akụkụ nke DC magnetik flux na ígwè isi nke mgbado ọkụ, na akụkụ a. na DC ndọta flux ga-n'elu mbụ alternating magnetik flux, na-eme ka ígwè The isi nwere ike iru magnetik saturation n'otu ụzọ, na-eme ka a nnukwu mmụba na transformer excitation ugbu a. N'ụzọ dị otú a, n'otu aka ahụ, mfu ígwè na ọla kọpa nke onye na-agbanwe agbanwe ga-abawanye, arụmọrụ ga-ebelata, mmụba okpomọkụ ga-abawanye; N'aka nke ọzọ, waveform nke ịgbado ọkụ ugbu a ga-akpaghasị njọ, na ike ihe ga-ebelata. Ndị a ga-enwe mmetụta na-adịghị mma na ọkụ ọkụ nke arc.
Oge nzipu: Mee-08-2023
