Welding Stainless steel tubing uye piping zvinowanzoda kucheneswa kumashure neargon paunenge uchishandisa maitiro echinyakare akadai segasi tungsten arc welding (GTAW) uye shielded metal arc welding (SMAW) .Asi mari yegesi uye nguva yekuseta yekuchenesa nzira inogona kuve yakakosha, kunyanya sezvo pombi madhayamita uye urefu hunowedzera.
Kana welding 300 akatevedzana simbi isina tsvina, makondirakiti anogona kubvisa blowback mune yakavhurika midzi canal welds nekuchinja kubva yechinyakare GTAW kana SMAW kuenda kune yakagadziridzwa welding process, ichiri kuwana yakakwira weld mhando, kuchengetedza iyo corrosion kuramba, uye kusangana Iyo Welding Procedure Specification (WPS) inoda yekuwedzera-yedunhu gasi gasi mabhenefiti ekugadzirisa mapfupi arcMA-welding process. ivity, kunyatsoita uye nyore kushandisa, kubatsira kuvandudza purofiti.
Inofarirwa nekushomeka kwayo uye kusimba kwayo, simbi isina simbi alloys inoshandiswa mune dzakawanda pombi uye tubing application, kusanganisira mafuta negasi, petrochemical, uye biofuels.Kunyange zvazvo GTAW yagara ichishandiswa mune dzakawanda simbi isina tsvina, ine zvimwe zvipingamupinyi zvinogona kugadziriswa nekuvandudzwa kwenguva pfupi GMAW.
Kutanga, sezvo kushayikwa kwevashandi vane unyanzvi kunoramba kuchienderera mberi, kuwana vashandi vanoziva GTAW idambudziko rinoramba riripo.Chechipiri, GTAW haisi iyo inokurumidza welding process, iyo inodzivisa makambani anotarisa kuwedzera kubereka kuti asangane nezvinodiwa nevatengi.Chechitatu, inoda nguva yakawanda uye inodhura backflushing ye stainless steel tubing.
Chii chinonzi blowback?Purge ndiko kuiswa kwegasi panguva yewelding kuti ibvise zvinosvibisa uye kupa rubatsiro.Iyo yekuseri yekuchenesa inodzivirira kuseri kweweld kubva pakugadzira heavy oxides muhupo hweokisijeni.
Kana kuseri kusina kudzivirirwa panguva yakavhurika midzi canal welding, kukuvadzwa kwe substrate kunogona kuguma.Kuputsika uku kunonzi saccharification, iyo yakatumidzwa nokuti inoguma kune imwe nzvimbo yakaita seshuga mukati meweld.Kudzivirira mashing, welder inopinza gasi hose kune imwe mugumo wepombi uye inovhara kuguma kwepombi nedhamu rekuchenesa.Vakagadzirawo imwe kupera kwepipe yepipe inopoteredza tapey inopoteredza tape. vakasvuura chikamu chetepi chakatenderedza mubatanidzwa ndokutanga kuvhetemesa, vachidzokorora nzira yekukurura nekusonerera kusvikira mudzi webead wapera.
Bvisa blowback.Retraces inogona kudhura nguva yakawanda uye mari, mune dzimwe nguva kuwedzera zviuru zvemadhora kuprojekiti.Kuchinja kune yakagadziridzwa pfupi-circuit GMAW process yaita kuti kambani ipedze midzi inopfuura pasina backflushing mune dzakawanda Stainless simbi applications.Welding applications for 300 series stainless steels akanyatsokodzera izvi, ukuwo pass-inpurity duru yeGMAW inoda midzi yakakwirira.
Kuchengeta kupisa kwekupisa kwakaderera sezvinobvira kunobatsira kuchengetedza corrosion resistance ye workpiece.Kuderedza nhamba ye weld passes ndiyo imwe nzira yekuderedza kupisa.Improved short-circuit GMAW maitiro, akadai seRegulated Metal Deposition (RMD®), shandisa yakanyatsodzorwa kuendeswa kwesimbi kuti ipe uniform droplet deposition.Izvi zvinoita kuti zvive nyore kune welder, iyo inoderedza kupisa kwepuddle inobvumira kudzora kupisa kwepuddle. kuomesa chando nekukurumidza.
Nekudzorwa kwesimbi kuchinjisa uye nekukurumidza weld dziva kutonhora, iyo weld dziva haina mhirizhonga uye inodzivirira gasi inosiya pfuti yeGMAW isinganetseki.Izvi zvinobvumira kudzivirira gasi kuti ipfuure nemumudzi wakashama, kubvisa mhepo uye kudzivirira saccharification kana oxidation kuseri kwe weld.Iyi gasi kufukidzwa kunongotora nguva pfupi yemahara nekuti puddle inokurumidza.
Kuedzwa kwakaratidza kuti yakagadziridzwa pfupi-circuit GMAW process inosangana ne weld quality miyero uku ichichengetedza kushora kwesimbi isina tsvina sepaya midzi bhedhi yakasungwa neGTAW.
Shanduko yewelding process inoda kuti kambani idzorese WPS yayo, asi shanduko yakadaro inogona kuunza yakakura nguva yekudzoka uye kuchengetedza mutengo webasa idzva rekugadzira nekugadzirisa.
Vhura midzi canal welding uchishandisa yakagadziridzwa pfupi-circuit GMAW maitiro inopa mamwe mabhenefiti mukubudirira, kushanda nesimba uye kudzidziswa welder.Izvi zvinosanganisira:
Inobvisa mukana wezvigero zvinopisa semugumisiro wekukwanisa kuisa simbi yakawanda kuwedzera kukora kwenzira yemidzi.
Yakanakisa kushivirira kwepamusoro uye yakaderera misalignment pakati pepombi zvikamu.Nekuda kwekufambiswa kwesimbi yakatsetseka, iyo nzira inogona nyore kuvhara mazambuko kusvika ku3⁄16 inches.
Kureba kweArc kunopindirana pasinei nekuwedzera kwe electrode, iyo inobhadhara vashandi vanonetseka kuti varambe vachiwedzera kuwedzera.
Deredza nguva yekuchinja kwemaitiro.Iyo tambo imwechete uye inodzivirira gasi inogona kushandiswa kumidzi, kuzadza uye cap channels.A pulsed GMAW process inogona kushandiswa chero nzira dzakazadzwa uye dzakavharwa neinenge 80% argon shielding gas.
Kune maoparesheni anotarisa kubvisa kumashure kwesimbi isina tsvina, zvakakosha kutevera matipi mashanu akakosha ekubudirira paunenge uchichinja kune yakagadziridzwa pfupi-circuit GMAW process.
Chenesa mukati nekunze kwepombi kuti ubvise chero tsvina.Shandisa tambo yewaya yakagadzirirwa simbi isina tsvina kuti uchenese kumashure kwejoini kanenge 1 inch kubva kumucheto.
Shandisa Stainless steel filler metal ine high silicon content, yakadai se316LSi kana 308LSi.Iyo yepamusoro yesilicon content inobatsira weld pool wetting uye inoita se deoxidizer.
Kuti uite zvakanakisisa, shandisa shielding gas musanganiswa wakanyatsogadzirirwa nzira, yakadai se90% helium, 7.5% argon, uye 2.5% carbon dioxide.Imwe sarudzo ndeye 98% argon uye 2% carbon dioxide.Mutengesi wegesi welding angave ane mamwe mazano.
Kuti uwane mibairo yakanakisa, shandisa muromo wakatemerwa uye muromo wemidzi yekugezera kuti uwane kuvharika kwegasi.Conical nozzle ine yakavakirwa-mukati gasi diffuser inopa kufukidzwa kwakanyanya.
Ziva kuti kushandisa yakagadziridzwa pfupi-circuit GMAW process pasina kutsigira gasi inoburitsa diki chiyero kuseri kweweld.Izvi zvinowanzoitika zvinoputika sezvo weld inotonhora uye inosangana nemhando yemhando yepetroleum, magetsi plant uye petrochemical application.
Jim Byrne ndiye Sales and Applications Manager weMiller Electric Mfg. LLC, 1635 W. Spencer St., Appleton, WI 54912, 920-734-9821, www.millerwelds.com.
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