Koj tuaj yeem ci tsis muaj flux?

Brazing, tus txheej txheem uas koom tes uas muaj cov tub rog siv Molten flux} Cov ntaub ntawv tshem tawm cov oxide thiab txwv tsis pub rov} oxidation. Tab sis ib lo lus nug uas nquag muaj nyob hauv kev lag luam thiab hobbyist cov voj voos mob siab: Koj puas khav tsis muaj flux? Cov lus teb yog muaj, tab sis tsuas yog nyob rau hauv cov xwm txheej tshwj xeeb, raws li flux ua lub luag haujlwm tseem ceeb hauv cov xwm txheej tseem ceeb tshaj plaws. Nkag siab thaum twg thiab ua li cas flux - Kev ua haujlwm tshiab ua haujlwm yog qhov tseem ceeb kom tsis txhob ua pob qij txha tsis muaj zog, oxidation, lossis ua tiav kev ua tiav.
Thaum flux - brazing dawb yog ua tau: tswj ib puag ncig
Flux txoj haujlwm tseem ceeb yog los tawm tsam oxidation, yog li brazing tsis muaj flux ua tiav tsuas yog thaum oxidation lossis minimized. Feem ntau cov kev ntseeg siab tshaj plaws suav nrog kev thaiv cov kev sib koom tes los ntawm oxygen siv cov chaw tshwj xeeb lossis cov khoom tshwj xeeb:
• Hauv cov roj cua hauv siab (piv txwv li cov cua sov hauv cov cua (piv txwv li, ntshiab argon lossis nitrogen) yog ib hom flux- txoj kev ywj pheej. Cov kua roj teeb roj oxygen, tiv thaiv kev tsim cov oxide ntawm ob qho tib si ntawm cov hlau thiab cov tub lim. Qhov no yog dav siv nyob rau hauv Aerospace thiab hluav taws xob, xws li cov neeg nyob rau hauv turbine hniav lossis microchaips) yuav tsum tau xoom flux residue. Piv txwv li, brazing titanium Cheebtsam hauv kev sib cav-}}}} full rauv xiCation nkaus, cia tus muab tub lim alloy ntws thiab txoj kev sib koom tes yam tsis tau flux.
• Nqus xau: Hauv cov tshuab nqus tsev, cov pa oxygen tau txo qis kom ze rau - xoom, tshem tawm oxidation kev pheej hmoo. Hom qauv no yog qhov zoo tagnrho rau high {2} Tus nqi hlau zoo li stainless hlau zoo li qub, nickel alloys, lossis refractory hlau (piv txwv li, molybdenum). Lub tshuab nqus pas yog qhov tseem ceeb hauv kev tsim khoom semiconductor, qhov chaw uas muaj kev nkag siab zoo tuaj yeem ua paug. Tsis muaj Oxygen, cov muab tub lim alloy wets lub hauv paus tshiab ywj pheej, sib sau huv, siab {{{lub zog pob qij txha.
• Tus kheej - fluexing alloys: ib co tub lim alloys (piv txwv li}. Cov alloys muaj cov ntsiab lus uas hnov ​​cov oxides, tsoo lawv thaum lub sij hawm brazing. Lawv ua haujlwm zoo tshaj plaws nrog cov hlau tshwj xeeb xws li npib tsib xee lossis cobalt thiab feem ntau siv hauv kev kho ua haujlwm rau kev lag luam tshuab. Txawm li cas los xij, lawv cov txiaj ntsig tsuas yog txwv rau qee yam - Lawv tsis tuaj yeem hloov cov roj ntsha li tooj liab zoo li tooj liab los yog txhuas, uas tsim tawv ntoo oxides.
Vim li cas flux feem ntau tsim nyog: qhov pheej hmoo ntawm oxidation
Nyob rau hauv feem ntau qhib - huab cua brazing science (piv txwv li lub teeb caj dab hauv kev cob qhia), flux- Cov kab mob dawb yog qhov pheej hmoo. Cov hlau zoo li tooj liab zoo li tooj liab, tooj dag, lossis aluminium ua cov tshuaj oxides sai sai thaum ua kom sov siab rau brazing kub (600-1100 degree). Cov oxide no tsim cov nyom uas:
• Tiv thaiv cov tub lim cov tshuab nqus ntawm ntub cov hlau, ua rau tsis sib luag ntws los yog cov khoob hauv qhov sib koom ua ke.
• Cuab yeej cov roj npuas, tsis muaj zog rau daim ntawv cog lus thiab nce txoj kev pheej hmoo ntawm cov kua dej.
• Tsim brittle intermetallic tebchaw sib xyaw, ua pob qij txha muaj kev tawg ua kom tawg.
Piv txwv li, brazing tooj liab kav hlau nrog ib qho nyiaj alloy nyob rau hauv qhib pa tsis tooj liab ua rau tooj liab oxide (cuo) sib sau rau saum npoo. Cov Molten nyiaj alloy yuav hlaws ntsoov tias yuav tsum tau nthuav tawm, uas ua rau muaj kev sib koom ua ke uas yuav ua tsis tau qhov siab- tseem ceeb hauv cov kav dej los yog hVAC.
Kev txwv ntawm flux - dawb crazing: dhau ntawm oxidation
Txawm hais tias thaum oxidation tswj, flux -} Tsis muaj cov teeb meem dawb uas tsis muaj kev siv:
• Cov nqi siv roj: inert roj furnaces lossis nqus plua plav yuav kim heev rau kev yuav me me {{free {{{- baderms ua haujlwm. Torch brazing nrog flux, los ntawm kev sib piv, yuav tsum muaj tsuas yog cov cuab yeej yooj yim.
• Cov khoom siv txwv: flux - Txoj kev ywj pheej ua haujlwm zoo tshaj plaws nrog cov hlau tsis zoo tshaj plaws (piv txwv li cov uas tsis muaj tshuaj oxides. Lawv tawm tsam nrog hlau zoo li txhuas, uas ua rau ntom ntom, cua sov}- oxide (al₂o₃) uas txawm tias cov roj ntsha tsis tuaj yeem tiv thaiv ib txwm.
• Cov qauv tsim qauv: Cov pob qij txha sib koom ua ke nrog cov kab mob nruj lossis crevices cuab huab cua, txawm tias nyob rau hauv inert olosceres, ua rau cov hauv zos oxidation. Flux, uas ntws mus rau hauv cov khoob, yog qhov zoo dua ntawm kev ncav tes cov chaw no kom yaj oxides.
Kev coj ua zoo tshaj plaws rau flux -} dawb crazing (thaum ua tau)
Rau cov uas siv flux -} txoj kev dawb, nruj txheej txheem tswj yog qhov tseem ceeb:
• Purge roj kom huv si: hauv inert gas brazing, xyuas kom lub chamber tau puv ntawm oxygen ua ntej cua sov. Txawm tias cov pa roj uas tsawg tuaj yeem ua rau oxidation hauv pob qij txha tseem ceeb.
• Tswj cov nqi cua sov: cua sov sai heev tuaj yeem tso cua hauv kev sib koom ua ke. Qeeb, cov cua sov niaj hnub tso cai ua pa roj ua pa tawm kom tshem tawm cov pa oxygen los ntawm crevices.
• Sib phim alloys rau substrates: Siv tus kheej -} fluexing alloys tsuas yog rau cov hlau tau tshaj. Piv txwv li, nickel - raws tus kheej {3} flux fluxing ua haujlwm tab sis tsis yog tooj liab.
Xaus: flux -} Dawb crazing - ichhe tov
Thaum brazing tsis muaj flux yog ua tau nyob rau hauv cov roj tswj tau xws li inert roj lossis nqus av, nws tsis yog txoj kev xaiv thoob ntiaj teb rau flux. Flux nyob tsis tseem ceeb rau feem ntau qhib- huab cua brazing cov ntawv thov, qhov twg nws ua kom ntseeg tau cov tshuaj oxidation. Flux - Txoj kev dawb Excel qhov chaw huv si {4 4} {{5 4} {{5 4} {{5 4} Tsis muaj nuj nqis, tab sis lawv hloov tsis tau zoo, tab sis lawv hloov tsis tau zoo, tab sis lawv hloov tsis tau zoo, tab sis lawv hloov tsis tau zoo, tab sis lawv hloov tsis tau, tab sis lawv hloov tsis tau zoo nkauj, tab sis lawv hloov tsis tau, tab sis lawv hloov tsis tau zoo nkauj, tab sis lawv hloov tsis tau, tab sis lawv hloov tsis tau zoo, tab sis lawv hloov tsis tau zoo, tab sis lawv hloov tsis tau zoo, tab sis lawv hloov tsis tau, tab sis lawv hloov tsis tau zoo, tab sis lawv hloov tsis tau, thiab lawv tsis tuaj yeem hloov flux hauv txhua hnub brazing scenarios.
Nkag siab txog cov lag luam {{}}} bets {1} Pab tau thaum brazing yog siv tau. Rau feem ntau cov neeg siv, flux tseem nyob ntawm cov tswv yim, nqi -}} Xaiv tau zoo, sib koom ua ke tau zoo nkauj.