I-Shift to the Cryogenic State: Inzuzo Yokuhlinzeka Ngoketshezi

Ngenkathi igesi ye-argon iyi-ejenti yokuvikela esebenzayo, indlela yokulethwa nokugcinwa idlala indima ebalulekile ekusebenzeni kahle kwezimboni nokulawula ubumsulwa. Kuzinhlelo eziningi zevolumu ephezulu noma ezihlanzekile, ukuhlinzeka nge-argon ngamasilinda egesi akunakwenzeka. Lokhu kusiletha ekubalulekeni kwesimo se-liquid.

Ukusebenza kahle Kwesitoreji Nezokuthutha

Amagesi athatha indawo enkulu. Ukuwacindezela abe amasilinda kuwumkhuba ojwayelekile, kodwa ngisho nasezingcindezini eziphakeme, umthamo wegesi oqukethwe uncane kakhulu. Isilinganiso sokunwetshwa kwe-argon sisuka kuketshezi siye kugesi singu-1 kuye ku-840.

Lokhu kusho ukuthi umthamo owodwa woketshezi uyanda ufinyelele kumavolumu angama-840 wegesi ezingeni lokushisa elijwayelekile nokucindezela.

Ngokugcina nokuthutha i-elementi esimweni sayo soketshezi lwe-cryogenic emazingeni okushisa angaphansi kuka -185.8°C (-302.4°F), amanani amakhulu angaphathwa ngendlela efanele. Ithangi elilodwa loketshezi oluwuketshezi lungangena esikhundleni samakhulu amasilinda egesi anomfutho ophezulu, lehlise kakhulu ubunzima bokusebenza, amaza okulethwa, kanye nomsebenzi ohambisana nokubamba amasilinda.

I-Purity Imperative

Inzuzo ebaluleke kakhulu yokusebenzisa uhlelo lokuhlinzeka ngoketshezi lwezinhlelo zokusebenza ezibucayi ukuthuthukiswa okungokwemvelo kokuhlanzeka.

Uma ukhiqiza igesi ehlanzeke kakhulu, umthombo owuketshezi usebenza njengesihlanzi semvelo. Inqubo ye-fractional distillation esetshenziselwa ukuhlukanisa umoya engxenyeni yawo yamagesi ngokwemvelo ikhiqiza imikhiqizo yoketshezi emsulwa kakhulu. Ngaphezu kwalokho, ukudonsa okuqhubekayo kusuka ethangini eliwuketshezi nge-vaporizer kuvimbela izinkinga ezivamile zokungcola ezihlobene nokushintshisana ngamasilinda egesi, njengokwethula umswakama womkhathi noma ukungcola phakathi nokuxhuma nokunqanyulwa.

Okwezimboni ezifunayo I-High-Purity Welding, i-argon yezinga lezimboni evamile ngokuvamile ayanele. Lezi zinhlelo zokusebenza zidinga i-argon ye-“Ultra-High Purity” (UHP), evame ukuziqhayisa ngamaleveli okuhlanzeka angu-99.999% (okuvame ukubizwa ngokuthi “ama-nines amahlanu”) noma ngaphezulu. Ukungcola komkhondo (umoya-mpilo, umswakama, ama-hydrocarbon esewonke) kufanele kugcinwe izingxenye ngesigidi (ppm) noma izingxenye ngebhiliyoni ngalinye (ppb) lamazinga. Ukugcina leli zinga lokuhlanzeka kusuka endaweni yokukhiqiza kuya ethoshi lokushisela kuyalawuleka kakhulu futhi kuthembekile uma kusetshenziswa ingqalasizinda ye-cryogenic liquid.

Izicelo Ezibalulekile: Lapho Ukuhlanzeka Kungaxoxiswana khona

Ukusetshenziswa kwalesi sihlangu esihlanzekile kakhulu, esifakwe umhwamuko akukona okomhlaba wonke; kuyisidingo esikhethekile emikhakheni lapho ukungasebenzi kahle kwe-weld kuyinhlekelele, ngokuphepha, ukulahleka kwezimali, noma ukungcoliswa komkhiqizo.

1. I-Aerospace kanye ne-Aviation

Imboni ye-aerospace isebenza ekugcineni kwesayensi yezinto ezibonakalayo. Izindiza nemikhumbi-mkhathi zisebenzisa ama-alloys angavamile—njenge-titanium, i-Inconel, namabanga akhethekile e-aluminium—ukukhulisa isilinganiso samandla nesisindo futhi imelane nezimo zokusebenza ezidlulele.

I-Titanium, ikakhulukazi, idume kabi. Ngisho namanani amancane okungcoliswa komoyampilo noma i-nitrogen ngesikhathi sokushisela azoholela e-embrittlement, ngokuvamile ekhonjwa ngokushintsha kombala okuluhlaza okwesibhakabhaka noma okuphuzi (okwaziwa ngele-“alpha case”). Ukuze ushise ngempumelelo izingxenye ze-titanium, njengamasistimu wokukhipha umoya wenjini noma amafreyimu esakhiwo, i-vacuum ephelele noma i-argon purge emsulwa iyadingeka.

2. Ukukhiqiza I-semiconductor

Ukwenziwa kwama-microchips kudinga indawo ehlanzekile kunegumbi lokuhlinzela esibhedlela. Amasistimu wamapayipi aletha amagesi enqubo yokuhlanzeka okuphezulu kakhulu kumathuluzi okukhiqiza kumele angabi nasici. Noma yikuphi ukungapheleli kwe-weld yangaphakathi, okufana nokuqhekeka okuncane kakhulu noma isiqephu se-oxidation (i-rouge), ingathwala ukungcola noma ichithe izinhlayiya ezizocekela phansi i-microscopery ekhiqizwayo.

Kule mboni, i-orbital welding isetshenziswa kakhulu. Le nqubo ezenzakalelayo incike kakhulu ku-UHP argon ukuze ihlanze kokubili ingaphandle nengaphakathi lamashubhu ahlanganiswayo, iqinisekisa ubushelelezi ngokuphelele, ubuso bangaphakathi obungenawo oksijini obungeke bonakalise inqubo yokwenziwa kwe-semiconductor.

3. I-Biopharmaceuticals kanye Nokudla/Isiphuzo

Ngokufana nokukhiqiza ama-semiconductor, izimboni zemithi nezokucubungula ukudla zibeka phambili inhlanzeko nobunyumba. Amapayipi ensimbi engagqwali kanye nemikhumbi esetshenziselwa ukuxuba nokuthutha izithako ezisebenzayo noma imikhiqizo yokudla kumele ihlanzeke kalula futhi ibulale amagciwane.

Uma i-weld ibushelelezi ngokuphelele futhi ingenayo i-oxidation ngenxa yokungavikeli okwanele, idala indawo encane ukuze kuthuthukiswe amagciwane nama-biofilms. Lezi “zicupho zeziphazamisi” azikwazi ukuqedwa yizinqubo ezijwayelekile zokuhlanzeka endaweni (CIP), okuholela ekungcolisweni okukhulu komkhiqizo. I-argon ye-high-purity iqinisekisa ukuthi ama-welds agcina ukumelana nokugqwala okufanayo kanye nokuqedwa kwendawo okubushelelezi njengesisekelo sensimbi engagqwali.

4. Imboni Yenuzi

Izidingo zemboni yenuzi ziyabonakala. Izingxenye ezisetshenziswa kuma-reactor namasistimu okuqukatha angaphansi kwemisebe enamandla, ukushisa, nengcindezi phakathi namashumi eminyaka esevisi. Ubuqotho besakhiwo balawa mashisela kumele bube buphelele. Izimiso eziqinile zokuqinisekisa ikhwalithi ekwenziweni kwezikhali zenuzi zigunyaza ukusetshenziswa kwezinto ezithengwayo zekhwalithi ephezulu kanye nezinqubo zokuvikela ukuze kuvinjelwe noma yimaphi amandla okwehluleka noma ukuvuza.

Umakhenikha Wokuvikela Okuphumelelayo

Ukumane ube negesi ehlanzekile etholakalayo akwanele; kufanele isetshenziswe ngendlela efanele ukuze kwakhiwe isihlangu esisebenzayo. Uhlelo lokulethwa kanye nenqubo esetshenzisiwe yizingxenye ezibalulekile zenqubo yokushisela.

Isilinganiso sokugeleza kanye Nokufakwa

Izinga lokugeleza kwegesi liyisenzo esibucayi sokulinganisa.

• Phansi kakhulu: Igesi ngeke iwususe kahle umoya osemkhathini, okuholela ekungcoleni nasekuqineni.

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• Iphakeme kakhulu: Izinga lokugeleza elidlulele lingabangela isiyaluyalu, empeleni lidonsele umoya ozungezile endaweni yokushisela ngomthelela we-Venturi, kwehlule injongo yesihlangu.

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Amazinga okugeleza alungile ancike kusayizi we-nozzle, inqubo yokushisela, idizayini ehlanganyelwe, nezimo ze-ambient (ezifana nokusalungiswa endaweni yokusebenza). Abashiseli basebenzisa amamitha okugeleza kwegesi ukuze balinganise ngokunembile ukulethwa.

Amalensi egesi

Ukuze kuthuthukiswe ukumbozwa nokunciphisa isiyaluyalu, izingxenye zethoshi ezikhethekile ezibizwa ngokuthi amalensi egesi zivame ukusetshenziswa, ikakhulukazi ekushiseleni kwe-TIG. Ilensi yegesi iqukethe izendlalelo ezinhle zensimbi engagqwali esebenza njenge-diffuser. Esikhundleni segesi enyakazayo ephuma emlonyeni, ilensi yegesi ikhiqiza ukugeleza kwe-laminar okubushelelezi, okuhambisanayo. Le kholomu ye-laminar inweba phambili ukusuka ku-nozzle, ihlinzeka ngokuvikeleka okuphezulu futhi ivumele i-welder ukuthi inwebe i-electrode ye-tungsten ukuze ibonakale kangcono emajoyini aqinile.

Ukuhlanza: Ukuvikela Izimpande

Ngenkathi ithoshi livikela indawo engaphezulu ye-weld, uhlangothi olungemuva (noma "impande") yejoyinti kufanele lucatshangelwe, ikakhulukazi uma amapayipi okushisela noma imikhumbi evalekile. Uma ingemuva le-weld lichayeka emoyeni ngenkathi lincibilikile, lizokhipha i-oxidize kakhulu, lidale isici esaziwa ngokuthi “ushukela.”

Ukuvimbela lokhu, umthamo wangaphakathi wepayipi noma umkhumbi ugcwele igesi ye-inert ngaphambi nangesikhathi senqubo yokushisela. Le ndlela, eyaziwa ngokuthi ukuhlanzwa emuva, ibalulekile ezinhlelweni zokusebenza zokuhlanzeka okuphezulu. Ngokushiselwa kwensimbi engagqwali ebalulekile noma i-titanium pipe, igesi yokuhlanza yangaphakathi ivamise ukugadwa nge-oxygen analyzer ukuze kuqinisekiswe ukuthi amazinga omoya-mpilo ehlele kumazinga amukelekayo e-ppm ngaphambi kokuba i-arc ishaywe.

Amagesi Ahlanganisiwe: Ukuthunga Isihlangu

Nakuba i-argon ehlanzekile iyindinganiso ye-TIG yokushisela izinsimbi ezingezona ayoni kanye nokuhlanzwa, ngezinye izikhathi ihlanganiswa namanye amagesi ukuze kuthuthukiswe izici ze-arc zezinhlelo ezithile zokusebenza, ikakhulukazi ekushiseleleni kwe-MIG.

• I-Argon/Helium Blends: I-Helium, enye igesi ehloniphekile, inamandla aphezulu e-ionization kanye ne-thermal conductivity ephakeme kune-argon. Ukwengeza i-helium ekuhlanganiseni kwenyusa okokufaka kokushisa kwe-arc, okuholela ekungeneni okujulile nesivinini sokuhamba esisheshayo. Lokhu kuvame ukusetshenziselwa ukushisela izingxenye ze-aluminium eziwugqinsi noma zethusi.

• I-Argon/CO2 Blends: Ngokushisela kwe-MIG ye-carbon steel, i-argon ehlanzekile ijwayele ukukhiqiza iphrofayili yokungena encane, efana nomunwe kanye ne-arc engaqondakali. Ukwengeza iphesenti elincane le-Carbon Dioxide (imvamisa engu-5% ukuya ku-25%) kuzinzisa i-arc, kuthuthukisa uketshezi lwe-weld pool, futhi kwandise iphrofayili yokungena.

• I-Argon/Oxygen Blends: Ukwengezwa okuncane kakhulu kwe-oxygen (1% kuya ku-2%) kungasetshenziswa ekushiseleni kwe-MIG yensimbi engagqwali ukuze kuzinzise i-arc futhi kuthuthukiswe isenzo sokumanzisa se-weld pool ngaphandle kokubangela i-oxidation ebalulekile.

• I-Argon/Hydrogen Blends: Kuzinhlelo zokusebenza zokushisela ze-TIG ezicacile, njengokushisela okuzenzakalelayo kwe-austenitic stainless steel tubing, iphesenti elincane le-hydrogen (2% kuya ku-5%) lingengezwa. I-Hydrogen isebenza njenge-ejenti eyehlisayo, isiza ekuthungatheni i-oksijini futhi ikhiqize amashisela ahlanzekile, agqamile anokufaka kancane ukushisa.

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Ngisho nakulezi zingxube ezikhethekile, i-argon ihlala iyingxenye yesisekelo, ihlinzeka ngesivikelo esiyinhloko se-inert kuyilapho igesi elengeziwe lishuna kahle izici ezibonakalayo ze-arc.

Ukucatshangelwa Kwemvelo Nokuphepha

Njengegesi ye-inert, i-argon ayinobuthi, iyavutha, noma iyagqwala. Ngokombono wemvelo, ayifaki isandla ekwakhekeni kwentuthu noma ekuncipheni kwe-ozone. Imane ibolekwe emkhathini futhi ekugcineni ibuyele kuwo.

Kodwa-ke, izimiso zokuphepha kufanele zilandelwe ngokuqinile, ikakhulukazi mayelana nokuphefumulelwa umoya.

Ingozi Yokuphefumula

Ngenxa yokuthi inzima kunomoya, le gesi inganqwabelana ezindaweni eziphansi, emigodini, emiseleni, noma ezindaweni ezivalekile (njengangaphakathi komkhumbi omkhulu ohlanzwayo). Isusa umoya-mpilo. Njengoba ingenambala futhi ingenaphunga, isisebenzi esingena endaweni engenawo umoya-mpilo ngeke siqaphele ukuthi sisengozini size singakwazi ukusebenza.

Izinqubo eziqinile zokungena endaweni evalekile, ukungena komoya okuqhubekayo, kanye nokusetshenziswa kweziqapha komoyampilo womuntu kuyimpoqo lapho usebenza ngamavolumu amakhulu amagesi angasebenzi ezindaweni ezivalekile.

Izingozi ze-Cryogenic

Lapho usebenzisana nesistimu yokuhlinzeka ngoketshezi, kunezingozi ezithile ezihlobene nokubanda okukhulu. Ukuthintana noketshezi lwe-cryogenic noma amapayipi angavaliwe kungabangela isithwathwa esinamandla. Izinto Ezisetshenziswayo Zokuzivikela Ezifanelekile (i-PPE), okuhlanganisa amagilavu ​​e-cryogenic nezihlangu zobuso, kufanele zigqokwe lapho kusetshenziswa amavalvu noma kuxhunywa amapayipi emfucumfucu noma amathangi ayinqwaba.

Ukwengeza, isilinganiso esikhulu sokwanda okukhulunywe ngaso ekuqaleni sisho ukuthi uma uketshezi luvaleleke engxenyeni yepayipi phakathi kwamavalvu amabili avaliwe ngaphandle kwamathuluzi okusiza ukucindezela, njengoba kufudumala futhi kuhwamuka, ukucindezela okuba umphumela kungabangela ukwehluleka okuyinhlekelele kwesistimu yamapayipi.

Ikusasa Lokwenziwa Okuhlanzekile Okuphakeme

Njengoba ubuchwepheshe buthuthuka, izinto esizisebenzisayo ziba yinkimbinkimbi, futhi ukubekezelela ukwehluleka kuncipha ngokusondela kuqanda. Isidingo sezinqubo zokukhiqiza ezingenasici siyaqhubeka nokukhuphuka kuyo yonke imikhakha yobuchwepheshe obuphezulu.

Kulesi landscape, indima ethembekile, eliphezulu I-Shielding Gas ibucayi kakhulu kunakuqala. Ushintsho olusuka kumasilinda omfutho ophezulu ngamunye ukuya kumasistimu wokuphakela uketshezi lwe-cryogenic lumelela ukuvuthwa kwezinqubo zokukhiqiza, ukubeka phambili ukusebenza kahle, ukungaguquguquki, kanye, ngaphezu kwakho konke, ubumsulwa obungantengantengi obudingekayo ukuze kuhlangatshezwane nezindinganiso zesimanje zobunjiniyela.

Isihlangu esingabonakali sinikezwe ngu I-argon ewuketshezi izoqhubeka nokuba yinto eyisisekelo ekwakheni ikusasa—kusuka kuma-microchips anika amandla umhlaba wethu wedijithali kuya endishini yasemkhathini ehlola i-cosmos, iqinisekisa ukuthi ukuxhumana okubalulekile okukubambe ndawonye kuhlala kuqinile, kumsulwa, futhi akunakunqamuka.

Imibuzo Evame Ukubuzwa

1. Ngingakwazi ukusebenzisa igesi evamile ye-argon yezimboni esikhundleni se-argon enoketshezi lwezinhlelo zokusebenza zokuhlanzeka okuphezulu?

Nakuba i-argon evamile yezimboni ifaneleka emisebenzini eminingi yokwenziwa okuvamile, ngokuvamile iqukethe ukungcola komkhondo (njengomoya-mpilo kanye nomswakama) okungamukeleki ekusetshenzisweni kokuhlanzeka okuphezulu. Ukuthola okuvela kuketshezi oluwuketshezi nokusebenzisa ama-vaporizer kuqinisekisa isisekelo esiphezulu kakhulu sokuhlanzeka, njengoba ukudonsa okuqhubekayo kuvimbela ukungcoliswa okuvame ukwethulwa ngesikhathi sokushintshwa kwesilinda segesi. Ezimbonini ezibucayi njengama-semiconductors noma i-aerospace, ukusebenzisa amamaki e-ultra-high purity (UHP) atholakala kumasistimu oketshezi lwenqwaba kuyanconywa kakhulu futhi kuvame ukugunyazwa.

2. Kungani i-argon ikhethwa kune-nitrogen njengendawo evikelayo engasebenzi?

Nakuba i-nitrogen ingabizi futhi yenza u-78% womkhathi, ayingenisi ngempela emazingeni okushisa aphezulu e-arc yokushisela. I-nitrogen ingasabela ngezinsimbi eziningi, ikakhulukazi izinsimbi ne-titanium, yakhe ama-nitride. Lawa ma-nitride angancibilika ku-weld pool, okubangela ukuqina okubalulekile futhi kwehlise kakhulu amandla okusebenza welunga. I-Argon, eyigesi ehloniphekile, ihlala ingenamakhemikhali ngisho nasemazingeni okushisa e-plasma, iqinisekisa ukuthi akukho ukusabela kwamakhemikhali okungafuneki okwenzeka ngensimbi encibilikisiwe.

3. Kuyini ‘ukuhlanzwa emuva,’ futhi kungani kudingekile?

Ukuhlanza emuva kuyinqubo yokugcwalisa umgodi wangaphakathi wepayipi noma umkhumbi ngegesi ye-inert (imvamisa i-argon) ngaphambi nangesikhathi senqubo yokushisela. Ngenkathi ithoshi yokushisela ivikela indawo engaphezulu yelunga ukusuka emkhathini, ukushisa kungena endaweni engaphakathi (impande). Uma ingaphakathi lepayipi ligcwele umoya ovamile, impande encibilikisiwe izosabela nomoya-mpilo, idale isici esimangelengele, esine-oxidized kakhulu eyaziwa ngokuthi “ushukela.” Ukuhlanzwa emuva kuqinisekisa ukuthi ingaphambili nengemuva le-weld lihlala endaweni ehlanzekile, okubalulekile ekusetshenzisweni kwamapayipi ahlanzekile kanye nezicelo zokucindezeleka okuphezulu.