Argon backflush inowanzodiwa pakuisa simbi isina tsvina machubhu uye mapaipi uchishandisa zvakajairwa maitiro akadai segasi shielded tungsten arc welding (GTAW) uye shielded metal arc welding (SMAW).Asi mari yegesi uye nguva yekugadzirisa yekuchenesa inogona kuva yakakosha, kunyanya sezvo pombi madhayamita uye urefu hunowedzera.
Kana welding 300 Series Stainless simbi, makondirakiti anogona kubvisa back-breakout mune yakavhurika midzi canal welds nekuchinja kubva kuGTAW yechinyakare kana SMAW kuenda kune yepamusoro welding process, uku ichichengetedza emhando yepamusoro welds, kuchengetedza zvinhu corrosion kuramba, uye kusangana neWelding Procedure Specification (WPS).) inoda pfupi redunhu simbi arc welding (GMAW) maitiro.Iyo yakagadziridzwa pfupi-yedunhu GMAW maitiro inopawo kuwedzera kuita, kushanda nesimba uye nyore-kwe-kushandisa mabhenefiti kubatsira kuwedzera purofiti.
Nekuda kwekuramba kwecorrosion uye simba, simbi isina tsvina alloys anoshandiswa mumapombi akawanda uye pombi maapplication, anosanganisira oiri negasi, petrochemicals, uye biofuel.Nepo GTAW yagara ichishandiswa mumidziyo yakawanda yesimbi isina simbi, ine zvimwe zvayakaipira zvinogona kugadziriswa neyakagadziridzwa pfupi wedunhu GMAW.
Kutanga, sezvo paine kuperevedza kuri kuramba kuchienderera mberi kwevashandi vane hunyanzvi, kutsvaga vashandi vanozivana neGTAW idambudziko rinoramba riripo.Chechipiri, GTAW haisiriyo inokurumidza kumhanyisa maitiro, ayo anotadzisa makambani ari kutsvaga kuwedzera chigadzirwa kuti asangane nezvinodiwa nevatengi.Chechitatu, zvinoda kurebesa uye kunodhura backflushing yemapombi esimbi.
Chii chinonzi mhinduro?Purge ndiko kuunzwa kwegasi panguva yewelding process kubvisa zvinosvibisa uye kupa rutsigiro.Back side purge inodzivirira kuseri kweweld kubva pakuumbwa kwemaokisi anorema pamberi peokisijeni.
Kana rutivi rwekumashure rusina kudzivirirwa panguva yekuputira midzi yakashama canal, kukuvadzwa pachigadziko kunogona kuguma.Kuputsika uku kunonzi saccharification nekuti kunokonzeresa kuti pave neshuga mukati meweld.Kuti udzivise kusvuuka, welder anopinza pombi yegasi kune imwe magumo epombi uye anovhara panoperera pombi nevharuvhu yekuchenesa.Vakagadzirawo mhepo kune rumwe rutivi rwepombi.Ivo zvakare vanowanzoisa tepi kutenderedza kuvhurwa kwejoinhi.Mushure mekuchenesa pombi, vakabvisa chimedu chetepi kumativi ejoini uye vakatanga kusungira, vachidzokorora kupfekenura uye kuputika kusvikira midzi yemidzi yapera.
Bvisa backlash.Kutsvaga zvakare kunogona kudhura nguva yakawanda nemari, mune zvimwe zviitiko kuwedzera zviuru zvemadhora kupurojekiti.Kuchinjira kune yepamberi pfupi kutenderera GMAW maitiro anobvumira kambani kuita midzi yekupfuura pasina kudzoreredza mune akawanda simbi isina tsvina.Welding 300 akatevedzana Stainless simbi inonyatso kuenderana neizvi, ukuwo welding yakakwirira kuchena duplex Stainless simbi parizvino inoda GTAW yemudzi pass.
Kuchengeta kupisa kwekuisa kwakaderera sezvinobvira kunobatsira kuchengetedza corrosion resistance ye workpiece.Imwe nzira yekudzikisa kupisa kupinza ndeyekudzikisa huwandu hwewelding inopfuura.Yepamberi pfupi-yedunhu GMAW maitirwo akadai seanodzorwa simbi deposition (RMD®) shandisa yakanyatso kudzorwa kufambisa simbi kuti ive nechokwadi chekudonhedza yunifomu.Izvi zvinoita kuti zvive nyore kune welder kudzora weld pool, iyo inodzora kupisa kwekupinza uye welding kumhanya.Kupisa kushoma kupinza kunobvumira dziva re weld kutonhora nekukurumidza.
Nekuda kwekudzorwa kwesimbi kuchinjisa uye nekukasira kutonhora kwedziva re weld, iyo weld pool haina mhirizhonga uye gasi rekudzivirira rinobuda muGMAW torch zviri nani.Izvi zvinobvumira gasi rekudzivirira kuti ripfuure nepakati pemudzi wakavhurika, richimanikidza kunze kwemhepo uye kudzivirira shugaring kana oxidation pasi peiyo weld.Uku kufukidzwa kwegasi kunotora nguva pfupi nekuti madhiri anooma nekukasira.
Kuyedzwa kwakaratidza kuti yakagadziridzwa pfupi yedunhu GMAW maitiro anosangana newelding mhando zviyero uku ichichengetedza simbi isina simbi inodzivirira yeGTAW midzi bead welding.
Kuchinja maitirwo ewelding kunoda kuti kambani idzosere WPS, asi shanduko yakadaro inogona kuguma nekuwana kwakakosha nguva uye kuderedzwa kwemutengo pane nyowani yekugadzira nekugadzirisa basa.
Welding yakavhurika midzi migero uchishandisa iyo yepamusoro pfupi yedunhu GMAW maitiro inopa mamwe mabhenefiti mukubudirira, kushanda nesimba uye welder dzidzo.Izvi zvinosanganisira:
Inobvisa mukana wematanho anopisa nekuda kwekukwanisa kukwira simbi yakawanda kuti iwedzere kukora kwemudziyo.
Kupokana kwakanakisa kune yakakwirira uye yakaderera displacements pakati pombi zvikamu.Nekufambiswa kwesimbi kwakatsetseka, maitiro aya anogona nyore kuvhara mabhuroko anosvika 3⁄16 inches.
Kureba kwearc kunoramba kuripo pasinei nekuwedzera kwe electrode, iyo inobhadhara kuoma kwevashandi vanoona zvakaoma kuchengetedza nguva dzose kuwedzera.Iri nyore kudzorwa weld dziva uye yunifomu yesimbi kutamisa kunogona kuderedza nguva yekudzidzira kune mawelder matsva.
Yakaderedzwa nguva yekuchinja kwemaitiro.Iyo imwechete waya uye inodzivirira gasi inogona kushandiswa midzi, kuzadza uye kuvhara migero.Iyo pulsed GMAW process inogona kushandiswa chero nzira dzazadzwa uye dzakavharwa kanenge 80% ne argon shielding gasi.
Kune Stainless simbi backflush operations, zvakakosha kutevera matipi mashanu akakosha ekubudirira kuchinjika kune yakagadziridzwa pfupi wedunhu GMAW maitiro.
Geza mapaipi mukati nekunze kuti ubvise chero tsvina.Shandisa bhurashi rewaya rakagadzirirwa simbi isina tsvina kuti uchenese seri kwejoini ingangoita 1 inch kubva kumucheto.
Shandisa yakakwira silicon isina simbi yekuzadza simbi yakadai se316LSi kana 308LSi.Iyo yakakwira silicon yemukati inosimudzira kunyorova kweweld pool uye inoita se deoxidizer.
Kuti uwane mhedzisiro yakanaka, shandisa shield gasi musanganiswa wakanyatso kugadzirirwa maitiro, senge 90% helium, 7.5% argon, uye 2.5% carbon dioxide.Imwe nzira ndeye 98% argon uye 2% carbon dioxide.Welding gasi mutengesi anogona kunge aine mamwe mazano.
Kuti uwane mhedzisiro yakanakisa, shandisa iyo conical tip uye midzi canal tip kuti uwane iyo gasi kufukidzwa.Conical nozzle ine yakavakirwa-mukati gasi diffuser inopa yakanakisa kufukidzwa.
Ziva kuti kushandisa yakagadziridzwa short circuit GMAW process isina back-up gas inokonzeresa marara mashoma ari pasi pe weld.Iyo inowanzo bhururuka sezvo weld inotonhora uye inosangana nemhando yemhando yeindasitiri yemafuta, zvidyarwa zvemagetsi uye petrochemicals.
Jim Byrne mutengesi uye maneja wezvikumbiro weMiller Electric Mfg. LLC, 1635 W. Spencer St., Appleton, WI 54912, 920-734-9821, www.millerwelds.com.
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