A cikin aikin samarwa, ana amfani da alternating current lokacin walda aluminum, magnesium da gami da su, don haka a cikin aiwatar da walƙiya na yanzu, lokacin da aikin aikin shine cathode, zai iya cire fim ɗin oxide, wanda zai iya cire fim ɗin oxide da aka kafa akan. fuskar tafkin narkakkar; Tungsten yana da matuƙar mahimmanci Lokacin da aka yi amfani da cathode, za a iya sanyaya wutar lantarki ta tungsten, kuma a lokaci guda ana iya fitar da isassun electrons, wanda ke taimakawa ga kwanciyar hankali na baka, ta yadda za a iya la'akari da duka biyun, da walda. tsari na iya ci gaba lafiya.
Duk da haka, lokacin amfani da wutar lantarki na AC, matsalolin masu zuwa suna tasowa: Na farko, zai haifar da wani abu na DC, wanda yake da illa; na biyu, ikon AC yana wucewa ta wurin sifili sau 100 a cikin daƙiƙa, kuma dole ne a ɗauki matakan daidaitawa.
Mai zuwa yafi gabatar da tsarawa da kawar da bangaren DC.
Dangane da AC arc, saboda bambance-bambance a cikin kayan lantarki da thermal na zahiri da ma'auni na geometric na lantarki da ƙarfe na tushe, aikin arc shafi, ƙarfin filin lantarki da ƙarfin ƙarfin baka a cikin rabi biyu na zagayowar AC na yanzu. asymmetrical, yin baka na halin yanzu Haka kuma ba daidai ba. A cikin rabin sake zagayowar tungsten pole cathode, ƙaddamarwar ginshiƙi na arc yana da girma, ƙarfin wutar lantarki yana da ƙananan, ƙarfin ƙarfin arc yana da ƙananan kuma na yanzu yana da girma; a cikin rabin sake zagayowar lokacin da tushe karfe ne cathode, halin da ake ciki ne kawai akasin haka, da arc ƙarfin lantarki ne high da kuma halin yanzu ne kananan. Saboda asymmetry na halin yanzu a cikin zagayowar rabi biyu, ana iya ɗaukar halin yanzu na AC arc ɗin da ya ƙunshi sassa biyu, ɗaya shine AC na yanzu, ɗayan kuma shine DC na yanzu wanda aka mamaye akan ɓangaren AC, na ƙarshe kuma. shine bangaren DC. Al'amarin da aka samar da bangaren DC a cikin AC arc ana kiransa tasirin gyaran fuska na tungsten AC argon arc waldi. Wannan tasirin gyaran ba wai kawai yana wanzuwa a lokacin walda AC TIG na aluminium ba, har ma yana faruwa lokacin da kaddarorin jiki na kayan lantarki guda biyu sun bambanta sosai. Wannan matsalar kuma tana kasancewa ne a lokacin walda gami kamar jan ƙarfe da magnesium tare da AC. Ko da lokacin da aka yi amfani da wannan abu don waldawar AC, saboda bambancin da ke tsakanin electrode da workpiece geometry da yanayin zafi mai zafi, za a sami bangaren DC, amma darajar yana da ƙananan ƙananan kuma baya rinjayar aikin yau da kullum na kayan aiki.
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Idan kayan lantarki da thermophysical na karfen tushe da lantarki sun bambanta, asymmetry da aka ambata a sama zai fi tsanani, kuma bangaren DC zai fi girma. Sabanin haka, kayan lantarki da na thermophysical na tushe da na'urar lantarki ba su bambanta da yawa ba, kuma bambancin yanayin zafi tsakanin su biyun yana haifar da ma'auni daban-daban na geometric kawai, kuma tasirin gyarawa ba a bayyane yake ba. Misali, a cikin walda na MIG, wayan walda da kayan aikin yawanci ana yin su ne da abu ɗaya, don haka asymmetry da aka ambata a sama ba a bayyane yake ba, kuma ana iya yin watsi da ƙaramin ɓangaren DC.
Jagoran bangaren DC daidai yake da shugabanci na yanzu a cikin rabin sake zagayowar tungsten pole cathode, yana gudana daga kayan tushe zuwa sandar tungsten, wanda yayi daidai da ingantaccen wutar lantarki na DC a cikin kewaye yayin waldi. Saboda kasancewar bangaren DC, na farko, cire fim din oxide da cathode zai yi rauni, na biyu kuma, za a samar da wani bangare na magnetic flux a cikin tsakiyar karfe na injin walda, kuma wannan bangaren. za a sanya jujjuyawar maganadisu na DC akan asalin juzu'in maganadisu mai canzawa, yana yin baƙin ƙarfe Ainihin na iya kaiwa ga saturation na maganadisu ta hanya ɗaya, yana haifar da haɓakar haɓakar haɓakar wutar lantarki a halin yanzu. Ta haka ne, a gefe guda, asarar ƙarfe da asarar tagulla na na'urar za ta karu, aikin zai ragu, kuma zafi zai ƙaru; a daya hannun, da waveform na walda halin yanzu za a tsanani gurbata, da kuma ikon factor za a rage. Wadannan za su yi mummunan tasiri a kan bargawar konewar baka.
Lokacin aikawa: Mayu-08-2023
