Argon backflush inowanzodiwa pakusanganisa machubhu esimbi isina ngura nemapombi uchishandisa nzira dzechinyakare dzakadai segas shielded tungsten arc welding (GTAW) uye shielded metal arc welding (SMAW). Asi mutengo wegesi nenguva yekuisa nzira yekuchenesa zvinogona kukosha, kunyanya sezvo dhayamita nemarefu epombi zvichiwedzera.
Pakusanganisa simbi isingatsvi ye300 Series, makambani anogona kubvisa kuputika kwemugero wevhu wakavhurika nekuchinja kubva kuGTAW kana SMAW yechinyakare kuenda kune welding yepamusoro, ukuwo vachichengetedza welds dzemhando yepamusoro, kuchengetedza ngura yezvinhu, uye kusangana neWelding Procedure Specification (WPS). ) inoda welding yesimbi pfupi yedunhu (GMAW). Maitiro ekuvandudzwa kweGMAW edunhu pfupi anopawo mamwe mashandiro, kushanda zvakanaka uye mabhenefiti ari nyore kushandisa kuti abatsire kuwedzera purofiti.
Nekuda kwekudzivirira ngura uye kusimba kwayo, simbi dzisina ngura dzinoshandiswa mumapaipi akawanda nemapombi, kusanganisira mafuta negasi, petrochemicals, uye biofuels. Kunyange zvazvo GTAW yagara ichishandiswa mumapaipi akawanda esimbi dzisina ngura, ine zvimwe zvakaipa zvinogona kugadziriswa nekuvandudzwa kwe short circuit GMAW.
Chekutanga, sezvo paine kushomeka kuri kuramba kuchiita vanhu vane hunyanzvi hwekuwedera, kuwana vashandi vanoziva GTAW idambudziko riripo. Chechipiri, GTAW haisiyo nzira yekukurumidza yekuwedera, iyo inotadzisa makambani ari kutsvaga kuwedzera kugona kuita kuti zvienderane nezvinodiwa nevatengi. Chechitatu, inoda kudzoreredzwa kwenguva refu uye kunodhura kwemapombi esimbi isina ngura.
Chii chinonzi mhinduro? Purge zvinoreva kuisa gasi panguva yekunamira kuti ubvise tsvina uye utsigire. Kunamira kumashure kunodzivirira musana we weld kubva pakuumbwa kwema oxide anorema kana paine oxygen.
Kana rutivi rwekumashure rusina kudzivirirwa panguva yekusveta mugero wemidzi wakavhurika, kukuvara kwehwaro kunogona kuitika. Kuputsika uku kunonzi saccharification nekuti kunoita kuti pave nechinhu chakaita seshuga mukati meweld. Kuti vadzivise kukweshwa, welder anoisa hose yegesi mune rimwe divi repombi uye anovhara mugumo wepombi nevharuvhu yekupukuta. Vanogadzirawo mhepo kune rimwe divi repombi. Vanowanzoisawo tepi yakatenderedza gonhi rejoini. Mushure mekuchenesa pombi, vakabvisa chidimbu chetepi yakatenderedza gonhi ndokutanga kusveta, vachidzokorora maitiro ekusveta nekusveta kusvika bead remidzi rapera.
Bvisa kudzoreredza. Kudzoreredza kunogona kutora nguva yakawanda nemari, dzimwe nguva zvichiwedzera zviuru zvemadhora kupurojekiti. Kuchinja kuita nzira yeGMAW pfupi inoenderera mberi kunobvumira kambani kuita root pass pasina backflushing mumabasa akawanda esimbi isingatsvedzi. Kuwelda 300 series stainless steels kwakakodzera izvi, nepo welding high purely duplex stainless steels parizvino ichida GTAW yeroot pass.
Kuchengeta kupisa kwakaderera sezvinobvira kunobatsira kuchengetedza kuramba kwesimbi yekushanda. Imwe nzira yekuderedza kupisa kwacho ndeyekuderedza huwandu hwemawelding passes. Maitiro epamusoro eGMAW akadai se controlled metal deposition (RMD®) anoshandisa simbi inodzorwa nemazvo kuti ave nechokwadi chekuti madonhwe akaenzana aiswa. Izvi zvinoita kuti zvive nyore kuti welder adzore dziva rekuweld, izvo zvinozodzora kupisa kwacho uye kumhanya kwekuweld. Kupisa kwakaderera kunobvumira dziva rekuweld kuti riome nekukurumidza.
Nekuda kwekutamiswa kwesimbi kwakadzorwa uye kukurumidza kuomesa kwedziva rekuweld, dziva rekuweld harina kuvhunduka zvakanyanya uye gasi rekudzivirira rinobuda mumwenje weGMAW zviri nyore. Izvi zvinobvumira gasi rekudzivirira kuti ripfuure nepakati pemudzi wakafumurwa, zvichidzinga mhepo uye zvichidzivirira shuga kana oxidation pasi peweld. Kufukidzwa kwegasi uku kunotora nguva pfupi nekuti madziva anoomesa nekukurumidza.
Kuedzwa kwakaratidza kuti maitiro ekugadzirisa mapfupi eGMAW anosangana nezvinodiwa zvemhando yewelding ukuwo achiramba achidzivirira ngura yesimbi isina ngura yeGTAW root bead welding.
Kuchinja maitiro ekunamira kunoda kuti kambani idzorezve WPS, asi kuchinja kwakadaro kunogona kukonzera kuwedzera kwenguva uye kuchengetedza mari pamabasa matsva ekugadzira nekugadzirisa.
Kubatanidza migero yemidzi uchishandisa nzira yepamusoro yeGMAW yekufambisa mvura kunowedzera mabhenefiti mukubudirira, kushanda zvakanaka uye dzidzo yekubatanidza mvura. Izvi zvinosanganisira:
Inobvisa mukana wekuti pave nemigero inopisa nekuda kwekugona kuisa simbi yakawanda kuti iwedzere ukobvu hwemugero wemidzi.
Kudzivirira kwakanyanya kuchinjika kwakakwirira nekwakaderera pakati pezvikamu zvepombi. Nekutamiswa kwesimbi kwakapfava, maitiro aya anogona kuvhara zviri nyore mipata inosvika 3⁄16 inches.
Kureba kwearc hakuchinji pasinei nekuwedzerwa kweelectrode, izvo zvinotsiva kuoma kwevashandisi vanoona zvakaoma kuchengetedza kuwedzerwa kusingagumi. Dziva rekuwelda rinodzorwa zviri nyore uye kutamiswa kwesimbi kwakafanana zvinogona kuderedza nguva yekudzidzira kune vanowelda vatsva.
Nguva shoma yekushanda kwemagetsi yekuchinja mashandiro. Waya imwe chete negasi rekudzivirira zvinogona kushandiswa pamidzi, kuzadza uye kufukidza migero. Maitiro eGMAW anoputika anogona kushandiswa chero bedzi migero yakazadzwa uye yakavharwa kanenge 80% negasi rekudzivirira reargon.
Pakushanda kwesimbi isina ngura, zvakakosha kutevedzera mazano mashanu akakosha ekubudirira kwekuchinja kuenda kune yakagadziriswa nzira yeGMAW yekuchinja mafambiro mapfupi.
Chenesa mapaipi mukati nekunze kubvisa chero tsvina. Shandisa bhurashi rewaya rakagadzirirwa simbi isingatsvi kuti uchenese kumashure kwejoini iri chinhambwe cheinenge 1 inch kubva kumucheto.
Shandisa simbi isina ngura ine silicon yakawanda yakaita se316LSi kana 308LSi. Iyo silicon yakawanda inokurudzira kunyorovesa kwedziva rekuwelda uye inoshanda se deoxidizer.
Kuti uwane mhedzisiro yakanaka, shandisa musanganiswa wegesi rekudzivirira rakagadzirwa zvakanangana nemaitiro acho, senge 90% helium, 7.5% argon, uye 2.5% carbon dioxide. Imwe sarudzo ndeye 98% argon uye 2% carbon dioxide. Mupi wegesi rekudzivirira anogona kunge aine mamwe mazano.
Kuti uwane mhedzisiro yakanaka, shandisa muromo wekona nemuromo wemugero wemidzi kuti uwane nzvimbo inofukidza gasi. Mugero wekona une gasi rakaiswa mukati unopa nzvimbo inofukidza gasi zvakanaka.
Ziva kuti kushandisa nzira yeGMAW yakachinjwa isina gasi rekuchengetedza kunoguma netsvina shoma pasi pe weld. Inowanzo pera kana weld ichitonhora uye ichisangana nezvinodiwa zvemhando yepamusoro zveindasitiri yemafuta, mafekitori emagetsi uye mapetrochemicals.
Jim Byrne ndiye maneja wekutengesa uye maapplication eMiller Electric Mfg. LLC, 1635 W. Spencer St., Appleton, WI 54912, 920-734-9821, www.millerwelds.com.
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