Ndeupi musiyano uripo pakati peTIG (DC) neTIG (AC)?

Yakananga ikozvino TIG (DC) welding ndipo iyo yazvino inoyerera munzira imwe chete.Kuenzaniswa neAC (Alternating Current) TIG welding iyo yazvino kana ichiyerera haiende kune zero kusvika welding yapera.Kazhinji TIG inverters ichave inokwanisa welding ingave DC kana AC/DC welding ine michina mishoma iri AC chete.

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DC inoshandiswa ku TIG welding Mild Steel/Stainless material uye AC yaizoshandiswa kupinza Aluminium.

Polarity

Iyo TIG welding process ine matatu sarudzo yewelding ikozvino zvichienderana nerudzi rwekubatanidza.Imwe neimwe nzira yekubatanidza ine zvese zvakanakira uye nekuipa.

Yakananga Yazvino - Electrode Negative (DCEN)

Iyi nzira yewelding inogona kushandiswa kune zvakasiyana-siyana zvezvinhu.Iyo TIG welding torch yakabatana kune yakashata yakabuda ye welding inverter uye tambo yekudzosera basa kune yakanaka kubuda.

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Kana iyo arc yakasimbiswa ikozvino inoyerera munharaunda uye kugoverwa kwekupisa muarc kwakapoteredza 33% mudivi rakashata rearc (the welding torch) uye 67% murutivi rwakanaka rwearc (chigamba chebasa).

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Iyi chiyero inopa yakadzika arc kupinza kwearc muchikamu chebasa uye inoderedza kupisa mu electrode.

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Izvi zvakadzikiswa kupisa mu electrode zvinobvumira yakawanda ikozvino kuti itakurwe nema electrode madiki kana ichienzaniswa nedzimwe polarity kubatana.Iyi nzira yekubatanidza inowanzonzi yakatwasuka polarity uye ndiyo inonyanya kubatanidza inoshandiswa muDC welding.

Yakananga Yazvino - Electrode Positive (DCEP)

Kana welding mune iyi modhi iyo TIG welding torch yakabatana kune yakanaka kubuda kweiyo welding inverter uye tambo yekudzosera basa kune yakashata yakabuda.

Kana iyo arc yakasimbiswa ikozvino inoyerera munharaunda uye kugoverwa kwekupisa muarc kwakapoteredza 33% mudivi rakashata rearc (basa rekushanda) uye 67% murutivi rwakanaka rwearc (the welding torch).

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Izvi zvinoreva kuti electrode iri pasi pepamusoro-soro yekupisa uye naizvozvo inofanira kuva yakakura kudarika neDCEN mode kunyange kana ikozvino inenge yakaderera kudzivirira electrode kupisa kana kunyunguduka.Iyo chidimbu chebasa chinoiswa kune yakaderera kupisa mwero saka iyo weld yekupinda ichave isina kudzika.

 

Iyi nzira yekubatanidza inowanzonzi reverse polarity.

Zvakare, neiyi modhi mhedzisiro yesimba remagineti inogona kutungamirira mukusagadzikana uye chiitiko chinozivikanwa searc blow apo iyo arc inogona kudzungaira pakati pezvinhu zvinosungirirwa.Izvi zvinogonawo kuitika muDCEN modhi asi zvakanyanya kuwanda muDCEP modhi.

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Zvinogona kubvunzwa kuti ndeipi nzira yekushandisa iyi kana welding.Chikonzero ndechekuti zvimwe zvisiri ferrous zvinhu zvakaita sealuminum pane zvakajairika kutarisana nemhepo zvinogadzira oxide pamusoro pepamusoro.Okisijeni iyi inogadzirwa nekuda kwekuita kweokisijeni mumhepo uye zvinhu zvakafanana nengura pasimbi.Zvakadaro okisidhi iyi yakaoma zvikuru uye ine nzvimbo yakakwira yekunyungudika kupfuura iyo chaiyo base material saka inofanira kubviswa pasati paitwa welding.

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Iyo okisijeni inogona kubviswa nekukuya, kubhurasha kana kumwe kucheneswa kwekemikari asi panongopera kuchenesa okisijeni inotanga kuumbwa zvakare.Naizvozvo, zvakanaka yaizocheneswa panguva welding.Mhedzisiro iyi inoitika kana yazvino ichiyerera muDCEP modhi apo maerekitironi anoyerera achipwanya nekubvisa okisidhi.Saka zvinogona kufungidzirwa kuti DCEP ingave iyo yakanakira nzira yewelding zvinhu izvi nerudzi urwu rweoxyde coating.Sezvineiwo nekuda kwekuratidzwa kwe electrode kune yakanyanya kupisa mazinga mune iyi modhi saizi yemagetsi yaizofanira kunge yakakura uye kupinda kwearc kunenge kwakadzikira.

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Mhinduro yemhando iyi yezvishandiso ingave yakadzika inopinda arc yeDCEN modhi pamwe nekucheneswa kweDCEP modhi.Kuti uwane aya mabhenefiti AC welding mode inoshandiswa.

Alternating Current (AC) Welding

Kana welding mu AC modhi ikozvino inopihwa neiyo welding inverter inoshanda pamwe nezvakanaka uye zvisina kunaka zvinhu kana hafu kutenderera.Izvi zvinoreva kuti ikozvino inoyerera neimwe nzira uyezve imwe panguva dzakasiyana saka izwi rekuchinjana ikozvino rinoshandiswa.Kubatanidzwa kwechimwe chinhu chakanaka uye chimwe chinhu chisina kunaka chinonzi denderedzwa rimwe.

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Nhamba yenguva iyo kutenderera kunopedzwa mukati mesekondi imwe inonzi frequency.MuUK kuwanda kwekuchinjisa ikozvino kunopihwa ne mains network ndeye makumi mashanu kutenderera pasekondi uye inoratidzwa se50 Hertz (Hz)

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Izvi zvinoreva kuti ikozvino inochinja ka100 pasekondi yega yega.Huwandu hwekutenderera pasekondi (frequency) mumushini wakajairwa hunotarwa neiyo mains frequency iyo muUK iri 50Hz.

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Izvo zvakakosha kucherechedza kuti sezvo frequency inowedzera magineti mhedzisiro inowedzera uye zvinhu zvakaita sematransformer zvinowedzera kuita zvakanyanya.Uyezve kuwedzera kuwanda kweiyo welding ikozvino inoomesa arc, inovandudza arc kugadzikana uye inotungamira kune inodzoreka welding mamiriro.
Nekudaro, izvi ndezve theoretical sezvo kana welding muTIG modhi pane zvimwe zvinofurira pane arc.

Iyo AC sine wave inogona kukanganiswa neiyo oxide coating yezvimwe zvinhu izvo zvinoita seyekugadzirisa inorambidza kuyerera kweelectron.Izvi zvinozivikanwa searc rectification uye mhedzisiro yacho inoita kuti iyo yakanaka hafu kutenderera ibviswe kana kukanganisa.Mhedzisiro yeiyo weld zone ndeye erratic arc mamiriro, kushaikwa kwekuchenesa chiito uye zvinogona kuitika tungsten kukuvara.

Arc kugadzirisa kweiyo yakanaka hafu kutenderera

Alternating Current (AC) Waveforms

The Sine Wave

Iyo sinusoidal wave ine chinhu chakanaka chinovaka kusvika pakukwirira kwayo kubva pazero isati yadzokera ku zero (inowanzo kunzi chikomo).

Sezvo ichiyambuka zero uye yazvino inoshandura nzira yakananga kune yakanyanya kunaka kukosha kwayo isati yasimuka kusvika zero (inowanzo kunzi mupata) kutenderera kumwe kunopedzwa.

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Mazhinji echinyakare TIG welders aingove sine wave mhando michina.Nekuvandudzwa kwemazuva ano welding inverters ane kuwedzera kuwanda kwemagetsi kwakauya budiriro pakutonga uye kuumbwa kweiyo AC waveform inoshandiswa pakunama.

The Square Wave

Nekuvandudzwa kweAC/DC TIG welding inverters kuti ibatanidze mamwe emagetsi chizvarwa chemichina yemakona yemasaisai chakagadzirwa.Nekuda kweaya magetsi ekutonga muchinjiko kubva kune yakanaka kuenda kune yakaipa uye zvinopesana inogona kuitwa kanenge nekukasira izvo zvinotungamira kune yakawedzera inoshanda ikozvino muhafu yega yega kutenderera nekuda kwenguva yakareba pakukwirira.

 

Iko kushandiswa kunoshanda kwesimba remagineti rakachengetwa rinogadzira waveforms ari padyo neskweya.Kudzora kwekutanga magetsi emagetsi akabvumira kutonga kwe 'square wave'.Iyo sisitimu yaizobvumira kutonga kweyakanaka (kuchenesa) uye isina kunaka (kupinda) hafu kutenderera.

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Mamiriro ekuenzanisa angave akaenzana + akanaka uye asina kunaka hafu mitsetse ichipa yakagadzikana weld mamiriro.

Matambudziko anogona kusangana ndeokuti kana kucheneswa kwaitika mune isingasviki hafu yakanaka yenguva yekutenderera ipapo imwe yakanaka yehafu yenguva haibudisi uye inogonawo kuwedzera kukuvara kunogona kuitika kune electrode nekuda kwekupisa.Nekudaro, rudzi urwu rwemuchina waizovewo nechiyero chekudzora icho chaibvumira nguva yehafu yakanaka kutenderera kusiyanisa mukati menguva yekutenderera.

 

Maximum Penetration

Izvi zvinogona kuwanikwa nekuisa kutonga kune imwe nzvimbo iyo ichaita kuti nguva yakawanda ishandiswe mune yakaipa hafu yenguva maererano neiyo positive half cycle.Izvi zvinobvumira kushandiswa kwepamusoro kushandiswa nemagetsi maduku semamwe

yekupisa iri mune yakanaka (basa).Kuwedzera kwekupisa kunoguma nekudzika kwakadzika mukati kana welding panguva imwechete yekufamba kumhanya seyakaenzana mamiriro.
Iyo yakaderedzwa kupisa yakakanganiswa nzvimbo uye kushoma kukanganisa nekuda kweiyo nhete arc.

 

Maximum Cleaning

Izvi zvinogona kuwanikwa nekuisa kutonga kune chinzvimbo chinogonesa nguva yakawanda kuti ishandiswe mune yakanaka hafu kutenderera maererano neiyo yakaipa hafu kutenderera.Izvi zvinobvumira kushandiswa kwakanyanya kwekuchenesa ikozvino kushandiswa.Izvo zvinofanirwa kucherechedzwa kuti pane yakanakisa yekuchenesa nguva mushure meiyo yakawanda kuchenesa haizoitika uye mukana wekukuvadza kune electrode yakakura.Mhedzisiro paarc ndeyekupa yakafararira yakachena weld dziva rine kudzika kwekupinda.