Welding stainless hlau yuav tsum tau xaiv cov roj shielding kom tswj nws cov metallurgical muaj pes tsawg leeg thiab txuam lub cev thiab txhua yam khoom.Common shielding gas ntsiab rau stainless hlau muaj xws li argon, helium, oxygen, carbon dioxide, nitrogen, thiab hydrogen (saib daim duab 1).Cov gases yog ua ke nyob rau hauv sib txawv ratios kom haum raws li cov kev xav tau ntawm txawv kev xa tawm hom, hlau hom, puag alloys thiab xav tau kev ceev.
Vim qhov tsis zoo thermal conductivity ntawm stainless hlau thiab qhov "txias" xwm ntawm luv luv-circuit hloov gas hlau arc vuam (GMAW), cov txheej txheem yuav tsum muaj ib tug "tri-mix" roj uas muaj 85% mus rau 90% helium (Nws), mus txog 10% Argon (Ar) thiab 2% mus rau 5% Carbon Dioxide (CO2% 9% sib tov, 7% Argon dioxide (CO2, 7%). thiab 2-1/2% CO2.Qhov siab ionization peev xwm ntawm helium txhawb arcing tom qab luv luv Circuit Court; Ua ke nrog nws cov thermal conductivity siab, kev siv Nws ua kom cov dej ntws ntawm lub pas dej molten.The Ar tivthaiv ntawm Trimix muab kev tiv thaiv dav dav ntawm cov pas dej da dej, thaum CO2 ua raws li cov khoom siv reactive kom stabilize lub arc (saib daim duab 2 rau qhov sib txawv shielding gases cuam tshuam rau weld hlaws profile).
Qee qhov sib xyaw ternary tuaj yeem siv cov pa oxygen los ua kom ruaj khov, thaum lwm tus siv He / CO2 / N2 sib tov kom ua tiav cov txiaj ntsig zoo ib yam.Qee cov khoom siv roj muaj cov khoom siv roj sib xyaw uas muab cov txiaj ntsig tau cog lus tseg. Cov tswv lag luam kuj pom zoo cov kev sib xyaw no rau lwm hom kev sib kis nrog cov txiaj ntsig zoo ib yam.
Qhov yuam kev loj tshaj plaws cov tuam txhab ua yog sim luv luv-circuit GMAW stainless hlau nrog tib cov roj sib tov (75 Ar / 25 CO2) raws li cov hlau me me, feem ntau yog vim lawv tsis xav tswj lub tog raj kheej ntxiv.Qhov sib xyaw no muaj cov pa roj carbon ntau dhau.Qhov tseeb, cov roj siv hluav taws xob siv rau cov khoom siv hlau yuav tsum muaj qhov siab tshaj ntawm 5% carbon dioxide.Siv cov khoom loj dua li cov hlau tsis muaj Lgrade. (L-qib muaj cov ntsiab lus carbon qis dua 0.03%). Cov pa roj carbon ntau dhau ntawm cov roj tiv thaiv tuaj yeem tsim cov chromium carbides, uas txo cov kev tiv thaiv corrosion thiab cov khoom siv kho tshuab.Soot tuaj yeem tshwm rau ntawm qhov chaw vuam.
Raws li ib sab ntawv, thaum xaiv cov hlau rau luv luv GMAW rau 300 series puag alloys (308, 309, 316, 347), manufacturers yuav tsum xaiv cov LSi qib.LSi fillers muaj ib tug tsawg carbon cov ntsiab lus (0.02%) thiab yog li tshwj xeeb tshaj yog pom zoo thaum muaj kev pheej hmoo ntawm intergranular corrosion.Higher silicon cov ntsiab lus ntawm cov khoom zoo xws li cov ntaub ntawv zoo nkauj, peb yuav txhim kho cov ntsiab lus ntawm cov ntaub ntawv zoo li qub. thiab txhawb fusion ntawm tus ntiv taw.
Cov neeg tsim khoom yuav tsum tau ceev faj thaum siv cov txheej txheem luv luv-circuit.Incomplete fusion tuaj yeem tshwm sim vim arc extinguishing, ua cov txheej txheem sub-par rau cov ntaub ntawv tseem ceeb.Nyob rau hauv qhov ntim siab, yog tias cov khoom tuaj yeem txhawb nws cov cua sov input (≥ 1/16 ntiv tes yog kwv yees li cov khoom siv thinnest welded siv cov mem tes xaiv hom), cov khoom siv pulse sprayld Where yuav yog ib qho kev hloov pauv ntawm pulse. yog qhov zoo dua vim nws muab kev sib xyaw ua ke ntau dua.
Cov hom kev hloov hluav taws xob siab no tsis tas yuav tsum muaj nws shielding gas.Rau tshuaj tsuag hloov welding ntawm 300 series alloys, ib qho kev xaiv yog 98% Ar thiab 2% reactive ntsiab xws li CO2 lossis O2.Qee cov roj sib tov kuj tseem muaj me me ntawm N2.N2 muaj peev xwm ionization ntau dua thiab thermal conductivity, uas txhawb kev ntub dej thiab tso cai rau kev mus los sai dua; nws kuj txo cov distortion.
Rau kev hloov pauv cov tshuaj txau GMAW, 100% Ar tej zaum yuav yog qhov kev xaiv tau.
Lub pas dej molten qeeb qeeb rau ferritic stainless hlau thiab duplex stainless hlau (50/50 piv ntawm ferrite rau austenite).Rau cov alloys, cov roj sib tov xws li ~ 70% Ar / ~ 30% He / 2% CO2 yuav txhawb kev ntub dej zoo dua thiab nce kev mus ncig ceev (saib daim duab 3). Zoo sib xws cov khoom sib tov yuav siv tau rau cov hlau nplaum, tab sis cov hlau sib tov yuav siv tau rau nickel oxide. weld nto (piv txwv li, ntxiv 2% CO2 lossis O2 txaus kom nce cov ntsiab lus oxide, yog li cov tuam txhab yuav tsum zam lawv lossis npaj siv sijhawm ntau rau lawv). Abrasive vim tias cov oxides no nyuaj heev uas cov hlau txhuam feem ntau yuav tsis tshem lawv).
Cov neeg tsim khoom siv flux-cored stainless hlau xaim rau qhov vuam tawm ntawm qhov chaw vuam vim tias cov txheej txheem slag hauv cov xov hlau no muab "txuas" uas txhawb nqa lub pas dej ua ke thaum nws khov kho.Vim cov flux muaj pes tsawg leeg txo cov teebmeem ntawm CO2, flux-cored stainless hlau xaim yog tsim los siv nrog 75% Ar / 25% CO2 thiab CO2 / corx cov nqi sib tov. Ntxiv rau ib phaus, nws tsim nyog sau cia tias siab dua txhua txoj haujlwm vuam nrawm thiab cov nqi tso tawm tuaj yeem txo cov nqi vuam tag nrho.Ntxiv mus, cov xaim flux-cored siv cov pa hluav taws xob tsis tu ncua DC tso zis, ua rau cov txheej txheem vuam yooj yim tsis tshua muaj nqi thiab tsis yooj yim dua li cov tshuab GMAW.
Rau 300 thiab 400 series alloys, 100% Ar tseem yog tus qauv kev xaiv rau roj tungsten arc vuam (GTAW).Thaum GTAW ntawm qee cov nickel alloys, tshwj xeeb tshaj yog nrog cov txheej txheem mechanized, me me ntawm hydrogen (txog 5%) tuaj yeem raug ntxiv kom nrawm nrawm (nco ntsoov tias tsis zoo li carbon hlau, npib tsib xee rau hydrogen tawg).
Rau vuam superduplex thiab superduplex stainless hlau, 98% Ar / 2% N2 thiab 98% Ar / 3% N2 yog cov kev xaiv zoo, ntsig txog.Helium kuj tuaj yeem ntxiv los txhim kho wettability li ntawm 30%. Qhov tsim ntawm microstructure nyob ntawm qhov txias txias, thiab vim tias TIG weld pas dej txias sai sai, ntau tshaj ferrite tseem nyob thaum siv 100% Ar.Thaum siv cov roj sib xyaw uas muaj N2, N2 nplawm rau hauv lub pas dej molten thiab txhawb kev tsim austenite.
Stainless hlau yuav tsum tau tiv thaiv ob sab ntawm qhov sib koom ua ke los tsim ib qho kev sib txuas ua tiav nrog kev tiv thaiv corrosion siab tshaj plaws. Kev tiv thaiv lub nraub qaum tuaj yeem ua rau "saccharification," los yog oxidation uas nws kim heev uas tuaj yeem ua rau solder tsis ua haujlwm.
Tight pob tw fittings nrog zoo heev haum los yog nruj nreem kaw nyob rau hauv lub rear ntawm lub haum tej zaum yuav tsis xav tau kev txhawb nqa gas.Ntawm no, qhov teeb meem tseem ceeb yog los tiv thaiv ntau heev discoloration ntawm lub tshav kub-cuam tshuam cheeb tsam vim oxide build-up, uas ces yuav tsum tau tshem tawm txhua yam.Technically, yog hais tias lub backside kub tshaj 500 degrees Fahrenheit, ib tug shielding 3 degrees yuav tsum tau siv roj. Fahrenheit raws li qhov chaw pib.Qhov zoo tshaj plaws, kev thim rov qab yuav tsum qis dua 30 PPM O2.Qhov kev zam yog yog tias lub nraub qaum ntawm cov vuam yuav raug khawb, hauv av thiab welded kom ua tiav qhov kev nkag mus rau qhov vuam.
Ob qhov kev txhawb nqa gases ntawm kev xaiv yog N2 (pheej yig tshaj) thiab Ar (nqi kim dua).Rau cov rooj sib tham me me lossis thaum Ar cov chaw tau yooj yim, nws yuav yooj yim dua los siv cov roj no thiab tsis tsim nyog rau N2 txuag. Txog li 5% hydrogen tuaj yeem ntxiv los txo oxidation.Muaj ntau yam kev lag luam muaj, tab sis kev txhawb nqa hauv tsev thiab purification dams muaj ntau.
Qhov sib ntxiv ntawm 10.5% lossis ntau dua ntawm chromium yog dab tsi muab cov hlau tsis muaj stainless nws cov khoom tsis zoo.Kev tuav cov khoom no yuav tsum muaj cov txheej txheem zoo hauv kev xaiv qhov tseeb vuam shielding roj thiab tiv thaiv lub nraub qaum ntawm qhov sib koom ua ke. Stainless hlau yog kim, thiab muaj cov laj thawj zoo rau kev siv nws.Nws tsis muaj qhov taw tes rau kev sim txiav cov fab thaum nws los txog rau shielding roj los yog xaiv cov khoom siv hlau ua haujlwm rau qhov kev nkag siab zoo rau qhov no. distributor thiab muab tub lim hlau tshwj xeeb thaum xaiv cov roj thiab muab tub lim hlau rau vuam stainless hlau.
Khaws cov xov xwm tshiab, xwm txheej thiab thev naus laus zis ntawm txhua yam hlau los ntawm peb ob tsab ntawv xov xwm txhua hli sau tshwj xeeb rau cov tuam txhab Canadian!
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm Canadian Metalworking, yooj yim nkag mus rau cov peev txheej tseem ceeb hauv kev lag luam.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm Made in Canada thiab Vuam, yooj yim nkag mus rau cov khoom lag luam muaj txiaj ntsig.