Mubvunzo: Munguva pfupi yapfuura takatanga kuita rimwe basa rinoda kuti zvimwe zvikamu zvigadzirwe kunyanya giredhi 304 simbi isina tsvina, iyo yakashongedzerwa pachayo uye kune simbi yakapfava.Takambosangana nedambudziko rekutsemuka pasimbi isina tsvina kune simbi isina tsvina inopinza kusvika 1.25" gobvu.Zvakanzi tine ferrite yakaderera kuverenga.Ungatsanangura sei izvi?
A: Uyu mubvunzo wakanaka. Hongu, tinogona kukubatsira kunzwisisa kuti ferrite yakaderera inorevei uye nzira yekudzivirira nayo.
Kutanga, ngationgororei tsananguro yesimbi isina tsvina (SS) uye kuti ferrite inobata sei kune akasungwa majoini.Simbi yakasviba uye alloys ine zvinopfuura 50% iron.Izvi zvinosanganisira zvose kabhoni uye simbi isina tsvina uye mamwe mapoka anotsanangurwa.Aluminium, mhangura uye titanium haina simbi, saka iyo mienzaniso yakanaka kwazvo yeasina-ferrous alloys.
Zvikuru zvinoumba alloy iyi carbon simbi ine kanenge 90% iron uye SS ine 70 kusvika 80% iron.Kuti SS, inofanira kunge iine kanenge 11.5% chromium yakawedzerwa.Chromium mazinga pamusoro peiyi mizinga inosimudzira kugadzirwa kwechromium oxide mafirimu panzvimbo dzesimbi uye kudzivirira kugadzirwa kweoxid oriron (oxid). kurwisa.
SS inonyanya kugoverwa mumapoka matatu: austenite, ferrite uye martensite.Zita ravo rinobva mukamuri-temperature crystal structure inovaita.Rimwe boka rinowanzozivikanwa ndiro duplex SS, iyo inowirirana pakati peferrite uye austenite muchimiro chekristani.
Austenitic grade, iyo 300 series, ine 16% kusvika 30% chromium uye 8% kusvika 40% nickel, ichiita austenitic crystal structure. 347.Inopa kurwisa kwakanaka kwekuora; inonyanya kushandiswa muzvokudya, basa remakemikari, mishonga uye cryogenic applications.Kudzora kwekugadzirwa kweferrite kunopa kusimba kwekushisa kwakanyanya.
Ferritic SS i400 series giredhi ine magineti akazara, ine 11.5% kusvika 30% chromium, uye ine ferritic predominant crystal structure.Kukurudzira kuumbwa kweferrite, stabilizers zvinosanganisira chromium, silicon, molybdenum, uye niobium panguva yekugadzirwa kwesimbi.Idzi mhando dzemagetsi emagetsi eSS anoshandiswa zvakanyanya uye masystem anopisa eSSmo. maapplication.Marudzi akawanda anowanzo shandiswa anoti 405, 409, 430 ne446.
Martensitic mamakisi, anozivikanwawo ne400 akatevedzana akadai 403, 410 uye 440, ane magineti, ane 11.5% kusvika 18% chromium, uye ane martensite sekristaro chimiro.Kusanganiswa uku kune goridhe rakadzikira, izvo zvinoita kuti dzisanyanya kudhura kugadzira.Vanopa kumwe kushora kwegora; simba guru; uye anowanzoshandiswa mumatafura, mazino uye zvekuvhiya, cookware, uye mamwe marudzi ematurusi.
Kana iwe weld SS, mhando ye substrate uye yayo-mu-sevhisi application ichasarudza yakakodzera filler simbi yekushandisa.Kana iwe ukashandisa gasi shielding process, ungangoda kutarisisa kuvharira gasi musanganiswa kudzivirira mamwe matambudziko ane chekuita newelding.
Kuti utengese 304 pachayo, iwe uchada E308 / 308L electrode. "L" inomiririra low carbon, iyo inobatsira kudzivirira intergranular corrosion.Ma electrode aya ane carbon content pazasi 0.03%; chero chinhu chiri pamusoro peizvi chinowedzera njodzi yecarbon precipitating kusvika kumiganhu yezviyo uye kubatanidza nechromium kuti iite chromium carbides, zvinobudirira kuderedza kushorwa kwesimbi yesimbi.Izvi zvinova pachena kana kuparara kunoitika munzvimbo inopisa inopisa (HAZ) yeSS welded joints.Kumwe kufunga kweL grade grade SS simba rekushanda kweSS kune simba rakadzika rekushanda kweSS.
Sezvo 304 iri austenitic rudzi rweSS, iyo inopindirana weld simbi ichava neakawanda eaustenite.Zvisinei, electrode pachayo ichange iine ferrite stabilizer, yakadai se molybdenum, kukurudzira kuumbwa kweferrite mu weld metal.Vagadziri vanowanzonyora mazita emhando yakawanda ye ferrite yakawanda ye austenite, simbi carbonbilizer yakataurwa pamusoro pezvikonzero izvi, simbi uye stabilizer. zvakakosha kudzivirira kuti isawedzerwa kune weld simbi.
Nhamba dzeFerrite dzinotorwa kubva padhiyagiramu yeSchaeffler uye dhayagiramu yeWRC-1992, inoshandisa nickel nechromium mafomula akaenzana kuverenga kukosha, iyo kana yakarongwa pamufananidzo inoburitsa nhamba yakajairwa. zvisinei, pazvikamu zvepamusoro, nhamba yeferrite inowedzera nekukurumidza.Yeuka kuti ferrite muSS haina kufanana nekabhoni simbi ferrite, asi chikamu chinonzi delta ferrite.Austenitic SS haina kushanduka kwechikamu kunobatanidza nepamusoro-soro maitiro akadai sekurapa kwekupisa.
Kuumbwa kweferrite kunodiwa nekuti ine ductile yakawanda kupfuura austenite, asi inofanirwa kudzorwa.Low ferrite counts inogona kuburitsa welds ine yakanakisa corrosion resistance mune mamwe maapplication, asi inonyanyo konzeresa kupisa panguva yewelding.Nekuda kwemamiriro ekushandiswa kwese, iyo ferrite count inofanira kunge iri pakati pe5 ne10, asi kune mamwe maapplication anogona kuderedzwa kana kukwirira kukosha kwebasa. chiratidzo cheferrite.
Sezvo wakataura kuti une nyaya dzekuputika uye nhamba yakaderera yeferrite, unofanirwa kunyatsotarisa pane simbi yako yekuzadza uye iva nechokwadi chokuti inobereka zvakakwana ferrite count - kumativi 8 inofanira kubatsira. Uyezve, kana uri kushandisa flux cored arc welding (FCAW), masimbi aya anozadza anowanzo shandisa 100% carbon dioxide shielding gas kana 725% musanganiswa, iyo inogona kukonzera 2% musanganiswa we carbon dioxide. simbi.Ungada kuchinjira kune gas metal arc welding (GMAW) process woshandisa 98% argon/2% musanganiswa weokisijeni kuderedza mukana wekutora kabhoni.
To weld SS to carbon steel unofanira kushandisa E309L filler material.Iyi simbi yekuzadza iyi inonyanya kushandiswa kugadzira simbi dzakasiyana uye inoita imwe chiyero cheferrite mushure mekunge kabhoni simbi yanyungudutswa mu weld.Sezvo imwe kabhoni yakanyudzwa mucarbon steel, ferrite stabilizers inowedzerwa kune filler simbi kuti irwisane nemaitiro eiyo kabhoni application.
Muchidimbu, kana uchida kubvisa kutsemuka kunopisa pa austenitic SS welded joints, simbisa simbi yakakwana yeferrite filler uye uteedzere tsika yakanaka yewelding. Chengeta kupisa kupinza kuri pasi pe50 kJ/inch, chengetedza tembiricha iri pakati nepakati kusvika yakaderera, uye ona kuti majoini ekutengesa haana kusvibiswa asati atengeswa. 5 kusvika ku10.
WELDER, yaichimbova Practical Welding Nhasi, inoratidza vanhu chaivo vanogadzira zvigadzirwa zvatinoshandisa uye kushanda nazvo zuva nezuva. Magazini ino yakashandira nharaunda yewelding muNorth America kwemakore anopfuura 20.
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