Argon backflush nthawi zambiri chofunika kuwotcherera zitsulo zosapanga dzimbiri machubu ndi mapaipi ntchito njira ochiritsira monga mpweya shielded tungsten arc kuwotcherera (GTAW) ndi shielded zitsulo arc kuwotcherera (SMAW).Koma mtengo wa gasi ndi nthawi yokhazikitsira ndondomeko yotsuka ikhoza kukhala yofunikira, makamaka pamene ma diameter a chitoliro ndi kutalika kumawonjezeka.
Pamene kuwotcherera 300 Series zitsulo zosapanga dzimbiri, makontrakitala akhoza kuthetsa mmbuyo-kusweka mu lotseguka mizu ngalande welds ndi kusintha kuchokera chikhalidwe GTAW kapena SMAW kwa njira kuwotcherera patsogolo, pamene kukhalabe apamwamba welds, kukhalabe kukana dzimbiri, ndi kukumana ndi kuwotcherera ndondomeko Mfundo (WPS).) imafuna njira yaying'ono yowotcherera zitsulo (GMAW).Njira yowongolera ya GMAW yafupipafupi imaperekanso ntchito zowonjezera, zogwira mtima komanso zosavuta kugwiritsa ntchito kuti zithandizire kuchulukitsa phindu.
Chifukwa cha kukana kwa dzimbiri ndi mphamvu, ma aloyi achitsulo chosapanga dzimbiri amagwiritsidwa ntchito pamapaipi ambiri ndi mapaipi, kuphatikiza mafuta ndi gasi, mafuta a petrochemicals, ndi biofuel.Ngakhale kuti GTAW yakhala ikugwiritsidwa ntchito pazitsulo zambiri zosapanga dzimbiri, ili ndi zovuta zina zomwe zingathetseredwe ndi GMAW yafupipafupi yowongoka.
Choyamba, popeza pali kuchepa kwa owotcherera aluso, kupeza antchito odziwa GTAW ndizovuta nthawi zonse.Kachiwiri, GTAW si njira yowotcherera yothamanga kwambiri, yomwe imalepheretsa makampani omwe akufuna kuwonjezera zokolola kuti akwaniritse zomwe makasitomala amafuna.Chachitatu, pamafunika kubwezeredwa kwakutali komanso kokwera mtengo kwa mapaipi achitsulo chosapanga dzimbiri.
Ndemanga ndi chiyani?Purge ndikuyambitsa gasi panthawi yowotcherera kuti achotse zonyansa ndikupereka chithandizo.Back side purge imateteza kumbuyo kwa weld ku mapangidwe a heavy oxides pamaso pa okosijeni.
Ngati mbali yakumbuyo sikutetezedwa pakuwotcherera kwa ngalande yotseguka, maziko angawonongeke.Kuwonongeka kumeneku kumatchedwa saccharification chifukwa kumapangitsa kuti pakhale malo onga shuga mkati mwa weld.Pofuna kupewa kupsa mtima, wowotcherera amalowetsa payipi ya gasi kumapeto kwa chitoliro ndikumangirira kumapeto kwa chitoliro ndi valavu yoyeretsa.Anapanganso potulukira mbali ina ya chitolirocho.Nthawi zambiri amayika tepi pozungulira polumikizira.Atatha kuyeretsa chitolirocho, adachotsa kachidutswa kakang'ono kuzungulira cholumikizira ndikuyamba kuwotcherera, kubwereza kuvula ndi kuwotcherera mpaka mkanda wa mizu utatha.
Chotsani kubwezera.Kubwezera kungawononge nthawi ndi ndalama zambiri, nthawi zina kumawonjezera masauzande a madola ku ntchito.Kusinthira ku njira yachidule ya GMAW yomwe imalola kuti kampaniyo izidutsa muzu popanda kubweza zitsulo zambiri zosapanga dzimbiri.Kuwotcherera zitsulo zosapanga dzimbiri 300 ndizoyenera izi, pomwe kuwotcherera zitsulo zosapanga dzimbiri za duplex pakali pano kumafuna GTAW kuti mudutse muzu.
Kusunga kutentha kutsika momwe kungathekere kumathandiza kuti chogwirira ntchito chisamachite dzimbiri.Njira imodzi yochepetsera kutentha ndikuchepetsa kuchuluka kwa ziphaso zowotcherera.Njira zotsogola za GMAW zafupipafupi monga kuwongolera zitsulo (RMD®) zimagwiritsa ntchito kusamutsa zitsulo zoyendetsedwa bwino kuti zitsimikizire kuyika kwa madontho ofanana.Izi zimapangitsa kukhala kosavuta kuti wowotchera aziwongolera dziwe la weld, lomwe limayang'anira kutentha ndi liwiro la kuwotcherera.Kutentha kochepa kumapangitsa kuti dziwe la weld lizimitsidwe mwachangu.
Chifukwa cha kusamutsidwa kwachitsulo komanso kuzizira kwambiri kwa dziwe la weld, dziwe la weld silikhala chipwirikiti ndipo mpweya wotchinga umatuluka muuni wa GMAW bwino.Izi zimathandiza kuti mpweya wotetezera udutse muzu wowonekera, kukakamiza kunja kwa mlengalenga ndi kuteteza shuga kapena oxidation pansi pa weld.Kuphimba gasiku kumatenga nthawi yochepa chifukwa madziwa amaundana mwachangu kwambiri.
Kuyezetsa kwawonetsa kuti njira yosinthidwa ya GMAW yosinthidwa imakumana ndi miyezo yowotcherera pomwe ikusunga kukana kwachitsulo chosapanga dzimbiri cha GTAW mizu yowotcherera.
Kusintha njira yowotcherera kumafuna kuti kampaniyo ivomerezenso WPS, koma kusintha kotereku kumatha kubweretsa phindu lalikulu komanso kupulumutsa mtengo pantchito yatsopano yopangira ndi kukonza.
Kuwotcherera mizu yotseguka pogwiritsa ntchito njira yachidule ya GMAW yoyendera kumapereka maubwino owonjezera pakupanga, kuchita bwino komanso maphunziro owotcherera.Izi zikuphatikizapo:
Amathetsa kuthekera kwa ngalande zotentha chifukwa chotheka kuyika zitsulo zambiri kuti muwonjezere makulidwe a mizu.
Kukana kwabwino kwambiri pakusamuka kwapamwamba ndi kotsika pakati pa magawo a chitoliro.Ndi kusamutsa kwachitsulo kosalala, njirayi imatha kutsekereza mipata mpaka mainchesi 3⁄16.
Kutalika kwa arc kumakhala kosalekeza mosasamala kanthu za kufalikira kwa electrode, zomwe zimabweretsa zovuta za ogwira ntchito omwe amavutika kuti apitirize kukulitsa nthawi zonse.Dziwe la weld lowongolera mosavuta komanso kusamutsa zitsulo zofananira kungachepetse nthawi yophunzitsira ma welder atsopano.
Kuchepetsa nthawi yochepetsera kusintha kwa ndondomeko.Waya womwewo ndi mpweya wotchinga ungagwiritsidwe ntchito pamizu, kudzaza ndi kuphimba ngalande.Njira ya pulsed GMAW ingagwiritsidwe ntchito pokhapokha ngati njirazo zadzazidwa ndi kutsekedwa osachepera 80% ndi mpweya woteteza argon.
Pazochita zazitsulo zosapanga dzimbiri, ndikofunikira kutsatira malangizo asanu ofunikira kuti musinthe bwino kupita ku njira yachidule ya GMAW yosinthidwa.
Tsukani mapaipi mkati ndi kunja kuti muchotse zodetsa zilizonse.Gwiritsani ntchito burashi yawaya yopangira chitsulo chosapanga dzimbiri kuti mutsuke kumbuyo kwa cholumikizira osachepera inchi imodzi kuchokera m'mphepete.
Gwiritsani ntchito zitsulo zosapanga dzimbiri za silicon zosapanga dzimbiri monga 316LSi kapena 308LSi.Zomwe zili pamwamba pa silicon zimalimbikitsa kunyowetsa dziwe la weld ndikuchita ngati deoxidizer.
Kuti mupeze zotsatira zabwino, gwiritsani ntchito chishango cha gasi wosakaniza wopangidwa mwapadera kuti agwire ntchitoyi, monga 90% helium, 7.5% argon, ndi 2.5% carbon dioxide.Njira ina ndi 98% argon ndi 2% carbon dioxide.Wopereka gasi wowotcherera akhoza kukhala ndi malingaliro ena.
Kuti mupeze zotsatira zabwino, gwiritsani ntchito nsonga ya conical ndi nsonga ya ngalande kuti mupeze mpweya.Conical nozzle yokhala ndi diffuser yomangidwa mkati imapereka chivundikiro chabwino kwambiri.
Dziwani kuti kugwiritsa ntchito njira yachidule ya GMAW yosinthidwa popanda mpweya wobwezeretsa kumabweretsa nyenyeswa pang'ono pansi pa chowotcherera.Nthawi zambiri zimayaka pamene weld akuzizira ndikukwaniritsa miyezo yapamwamba yamakampani amafuta, mafakitale amagetsi ndi mafuta a petrochemicals.
Jim Byrne ndi woyang'anira malonda ndi ntchito kwa Miller Electric Mfg. LLC, 1635 W. Spencer St., Appleton, WI 54912, 920-734-9821, www.millerwelds.com.
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