Welding Stainless simbi inoda kusarudzwa kwekudzivirira gasi kuchengetedza metallurgical kuumbwa uye kubatanidzwa kwemuviri uye michina zvinhu.Common shielding gasi zvinhu zvesimbi isina tsvina zvinosanganisira argon, helium, okisijeni, carbon dioxide, nitrogen, uye hydrogen (ona Mufananidzo 1) .Magasi aya akabatanidzwa muzvikamu zvakasiyana kuti aenderane nezvinodiwa zvakasiyana-siyana zvekufambisa, tambo dzekufambisa, tambo yekufambisa, tambo yekufambisa, wire, tambo yekufambisa, tambo yekufambisa, wire, tambo yekufambisa, wire, speed bases.
Nekuda kwekusashanda zvakanaka kwekupisa kwesimbi isina tsvina uye "inotonhora" hunhu hwepfupi-circuit kufambisa gasi simbi arc welding (GMAW), iyo nzira inoda "tri-mix" gasi rine 85% kusvika 90% helium (He), kusvika 10 % Argon (Ar) uye 2% kusvika 5% CO2 musanganiswa weCarbon 0%, A9% inosanganisirwa Carbon Dioxide). , uye 2-1 / 2% CO2. Iyo yakakwirira ionization inokwanisa ye helium inokurudzira arcing mushure mechinguva chiduku;yakabatanidzwa nepamusoro-soro yekupisa kwayo, kushandiswa kweAnowedzera kunyunguduka kwedziva rakanyungudutswa.Iri chikamu cheAr cheTrimix chinopa kudzivirirwa kwakawanda kweweld puddle, nepo CO2 inoshanda sechinhu chinogadzirisa kugadzirisa arc (ona Mufananidzo 2 kuti magasi ekudzivirira akasiyana sei anokanganisa weld bead profile).
Mimwe misanganiswa ye ternary inogona kushandisa oxygen seyakagadzikana, asi vamwe vanoshandisa He / CO2 / N2 musanganiswa kuti vabudirire zvakafanana.Vamwe vanogovera gasi vane proprietary gas blends inopa zvikomborero zvakavimbiswa.
Chikanganiso chikuru chinoitwa nevagadziri ndechekuedza kupfupisa GMAW simbi isina tsvina ine gasi musanganiswa wakafanana (75 Ar/25 CO2) sesimbi yakapfava, kazhinji nekuti havadi kubata imwe humburumbira.Musanganiswa uyu une kabhoni yakawandisa.Kutaura zvazviri, chero gasi rekudzivirira rinoshandiswa pawaya yakasimba rinofanira kunge riine huwandu hunosvika 5% carbon dioxide.Kushandisa giredhi hombe ine carbonlloy-grade inofungidzirwa kuti carbonlloy giredhi yakawanda-yepamusoro yesimbi L inoguma nekabhoni-giredhi yakakura. pasi pe 0.03%).Kabhoni yakawandisa mukudzivirira gasi inogona kuumba chromium carbides, iyo inoderedza kusagadzikana kwekuora uye mechanical properties.Soot inogonawo kuonekwa pane weld surface.
Sechinyorwa chepadivi, pakusarudza simbi dzekupfupisa GMAW ye300 series base alloys (308, 309, 316, 347), vagadziri vanofanira kusarudza LSi giredhi.LSi fillers vane low carbon content (0.02%) uye saka zvinonyanya kukurudzirwa kana paine njodzi ye intergranular corrosion. pachigunwe.
Vagadziri vanofanira kungwarira pavanenge vachishandisa pfupi-circuit kufambisa maitiro.Isina kukwana fusion inogona kuguma nekuda kwekudzima kwearc, zvichiita kuti nzira yacho iite sub-par yezvikumbiro zvakakosha.Mumamiriro ezvinhu epamusoro-soro, kana zvinhu zvinogona kutsigira kupisa kwaro (≥ 1/16 inch inenge iyo thinnest material welded uchishandisa pulse spray mode), kuva zvinhu zvinotsigira kupfapfaidza nzira, iyo pulseld sprayed inosarudza nzvimbo, GW inosarudza kupfapfaidza. sezvo inopa fusion inowirirana.
Aya maitiro ekupisa kupisa haadi He shielding gas.Nekuda kwespray transfer welding ye 300 series alloys, a common choice is 98% Ar uye 2% reactive zvinhu zvakadai se CO2 kana O2.Mimwe misanganiswa yegasi inogonawo kunge iine zvishoma zveN2.N2 ine yakakwirira ionization inogona uye thermal conductivity, iyo inokurudzira wetting uye inobvumira kukurumidza kufamba;zvinoderedzawo kukanganisa.
For pulsed spray transfer GMAW, 100% Ar inogona kuva sarudzo inogamuchirwa.Nekuda kwekuti pulsed current inogadzirisa arc, gasi haidi nguva dzose zvinhu zvinoshanda.
Dziva rakanyungudutswa rinononoka kune ferritic Stainless steels uye duplex Stainless steels (50/50 ratio ye ferrite kune austenite) .Kune aya alloys, gasi musanganiswa wakadai ~ 70% Ar / ~ 30% He / 2% CO2 ichakurudzira kunyorova uye kuwedzera kukurumidza kufamba (ona Mufananidzo 3) . pamusoro (semuenzaniso, kuwedzera 2% CO2 kana O2 yakakwana kuti iwedzere oxide yemukati, saka vanogadzira vanofanira kuvadzivisa kana kugadzirira kupedza nguva yakawanda pavari).Abrasive nekuti ma oxides aya akaomarara zvekuti wire brush kazhinji haabvise).
Vagadziri vanoshandisa flux-cored stainless wires for out-of-situ welding because the slag system in these wires inopa "sherufu" inotsigira weld pool sezvainosimba.Nekuda kwekuti flux composition inoderedza migumisiro ye CO2, flux-cored stainless steel wire yakagadzirirwa kushandiswa ne 75% CO2 % 0 0 0 0 0 0 0 CO2 musanganiswa we CO2, CO2, CO2, 2W, CO2, uye CO2. waya inogona kudhura pakirogiramu imwe neimwe, zvakakosha kuziva kuti yakakwirira-yepamusoro-yenzvimbo yekumhanyisa kumhanya uye deposition mitengo inogona kudzikisa huwandu hwese welding cost.In Uyezve, iyo flux-cored wire inoshandisa yakajairika voltage DC kubuda, ichiita iyo yekutanga welding system isingadhure uye isinganyanyi kuomarara pane pulsed GMAW masisitimu.
Kune 300 uye 400 series alloys, 100% Ar inoramba iine sarudzo yegasi tungsten arc welding (GTAW) .Panguva yeGTAW yemamwe nickel alloys, kunyanya nemakanika maitiro, zvishoma zvehydrogen (kusvika ku5%) zvinogona kuwedzerwa kuwedzera kukurumidza kufamba (cherechedza kuti kusiyana necarbon steels, nickel kune hydrogen alloys haisi cracking).
Kune welding superduplex uye superduplex Stainless steels, 98% Ar/2% N2 uye 98% Ar/3% N2 isarudzo dzakanaka, zvichiteerana.Helium inogonawo kuwedzerwa kuti ivandudze wettability neanenge 30%.Kana welding super duplex kana super duplex stainless steels, chinangwa ndechekugadzira chibatanidza chine aurricaite% inenge 50 % fraformation. ye microstructure inobva pahuwandu hwekutonhora, uye nokuti iyo TIG weld pool inotonhora nokukurumidza, ferrite yakawandisa inoramba iripo kana 100% Ar inoshandiswa.Kana gasi rinosanganiswa rine N2 rinoshandiswa, N2 inopinda mudziva yakanyungudutswa uye inokurudzira kuumbwa kwe austenite.
Simbi isina tsvina inoda kuchengetedza mativi maviri emubatanidzwa kuti ibudise weld yakapedzwa neyakaomarara kusagadzikana.
Tight butt fittings ine zvinogara zvakanakisa kuenderana kana kusimba kwemukati kumashure kweiyo fitting ingasada tsigiro gasi.Pano, nyaya huru ndeyekudzivirira yakawandisa discoloration yenzvimbo inobatwa nekupisa nekuda kwe oxide build-up, iyo inoda kubviswa kwemagetsi. renheit sechikumbaridzo.Zvakanaka, kutsigirwa kunofanira kuva pasi pe 30 PPM O2. Kunze kwekuti kana mushure we weld ichave yakagochwa, pasi uye yakasungirirwa kuti iwane kupindira kwakakwana kwe weld.
Magasi maviri anotsigira esarudzo ndiN2 (yakachipa) uye Ar (inodhura zvakanyanya) .Kumagungano maduku kana kana maAr sources aripo nyore nyore, zvingava zviri nyore kushandisa gasi iri uye zvisingakodzeri kuchengetedza N2.Kusvika ku5% hydrogen inogona kuwedzerwa kuderedza oxidation.Kune zvakasiyana-siyana zvekutengeserana zvinosarudzwa zviripo, asi zvitsigiro zvekumba uye madhamu ekuchenesa zvinowanzoitika.
Kuwedzerwa kwe10.5% kana kupfuura kwechromium ndiko kunopa simbi isina tsvina.Kuchengetedza zvinhu izvi kunoda unyanzvi hwakanaka pakusarudza gasi rakakodzera rekudzivirira shielding nekudzivirira kuseri kwekubatana.Stainless steel inodhura, uye pane zvikonzero zvakanaka zvekuishandisa.Hapana chikonzero mukuedza kutema makona kana zvasvika kune iyi shielding inogadzirisa ruzivo. distributor uye filler simbi nyanzvi pakusarudza gasi uye filler simbi ye welding Stainless simbi.
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