Yuav ua li cas txog qhov vuam nyhuv ntawm lub tshuab nqus tsev brazing rauv

Yuav ua li cas txog qhov vuam nyhuv ntawm lub tshuab nqus tsev brazing rauv

Txoj kev brazing hauv lub tshuab nqus tsev yog ib txoj kev tshiab brazing tsis muaj flux nyob rau hauv lub tshuab nqus tsev.Vim hais tias lub brazing yog nyob rau hauv ib qho chaw nqus, qhov teeb meem ntawm huab cua ntawm lub workpiece tuaj yeem raug tshem tawm zoo, yog li lub brazing tuaj yeem ua tiav yam tsis siv cov flux.Nws yog tsuas yog siv rau brazing hlau thiab alloys uas nyuaj rau braze, xws li txhuas alloys, titanium alloys, high-temperature alloys, refractory alloys thiab ceramics.Lub brazed sib koom yog ci thiab compact, nrog zoo txhua yam khoom thiab corrosion kuj.Lub tshuab nqus tsev brazing feem ntau tsis siv rau koob vuam ntawm cov hlau thiab cov hlau tsis tshua muaj hlau.

Cov khoom siv brazing hauv lub tshuab nqus tsev yog tsim los ntawm lub tshuab nqus tsev vacuum thiab lub tshuab nqus tsev.Muaj ob hom kev siv lub tshuab nqus tsev vacuum: qhov cub kub thiab qhov cub txias.Ob hom furnaces tuaj yeem ua kom sov los ntawm cov nkev lossis hluav taws xob cua sov, thiab tuaj yeem tsim rau sab mounted rauv, hauv qab mounted rauv lossis sab saum toj mounted rauv (Kang hom) qauv.Lub tshuab nqus tsev tuaj yeem siv dav dav.

Lub tshuab nqus tsev feem ntau suav nrog lub tshuab nqus tsev, lub tshuab nqus tsev, lub tshuab nqus tsev vacuum, thiab lwm yam. Lub tshuab nqus tsev feem ntau yog tsim los ntawm lub tshuab nqus tsev twj tso kua mis thiab roj diffusion twj tso kua mis.Lub tshuab twj tso kua mis ib leeg tsuas tuaj yeem tau txais tsawg dua 1.35 × Nqus qib ntawm 10-1pa qib.Yuav kom tau txais lub tshuab nqus tsev siab, cov roj diffusion twj tso kua mis yuav tsum tau siv tib lub sijhawm.Lub sijhawm no, nws tuaj yeem ncav cuag 1.35 × Nqus tsev kawm ntawv qib 10-4Pa.Cov roj siab hauv qhov system yog ntsuas nrog lub tshuab nqus tsev vacuum.

Brazing nyob rau hauv lub tshuab nqus tsev rauv yog braze nyob rau hauv lub cub tawg los yog brazing chamber nrog cua muab rho tawm.Nws yog tshwj xeeb tshaj yog haum rau brazing loj thiab nruam pob qij txha, thiab kuj haum rau txuas ib co tshwj xeeb hlau, xws li titanium, zirconium, niobium, molybdenum thiab tantalum.Nws muaj ntau yam kev siv.Txawm li cas los xij, lub tshuab nqus tsev brazing kuj muaj qhov tsis zoo hauv qab no:

① Cov hlau yog yooj yim rau volatilize nyob rau hauv lub tshuab nqus tsev vacuum, yog li nws tsis tsim nyog siv lub tshuab nqus tsev brazing rau lub hauv paus hlau thiab muab tub lim hlau ntawm volatile ntsiab.Yog tias tsim nyog siv, cov txheej txheem sib txuas ua ke yuav tsum tau txais yuav.

② Nqus brazing yog rhiab heev rau qhov roughness ntawm qhov chaw, kev sib dhos zoo thiab haum rau kev ua siab ntev ntawm cov khoom brazed, thiab yuav tsum muaj kev ntseeg siab ntawm qhov chaw ua haujlwm thiab cov neeg ua haujlwm.

③ Cov khoom siv nqus tsev vacuum yog qhov nyuaj, nrog kev nqis peev loj ib zaug thiab cov nqi kho mob siab.

Yog li, yuav ua li cas siv cov txheej txheem brazing hauv lub tshuab nqus tsev vacuum?Thaum brazing yog nqa tawm nyob rau hauv lub tshuab nqus tsev vacuum, lub weldment yuav tsum welded yuav tsum tau loaded rau hauv lub cub tawg (los yog mus rau hauv lub brazing hlab), lub qhov cub yuav tsum tau kaw (los yog lub brazing nkoj cover yuav tsum tau kaw), thiab pre vacuumized ua ntej. cua sov.Pib lub tshuab twj tso kua mis ua ntej, tig lub steering valve tom qab lub tshuab nqus tsev kawm ntawv nce mus txog 1.35pa, kaw txoj kev ncaj nraim ntawm lub tshuab twj tso kua mis thiab lub qhov cub brazing, ua rau cov kav dej txuas nrog lub cub tawg los ntawm lub tshuab nqus tsev twj tso kua mis, cia siab rau lub tshuab twj tso kua mis thiab lub diffusion twj tso kua mis mus ua hauj lwm nyob rau hauv ib tug tsawg lub sij hawm, tso lub brazing rauv mus rau qhov yuav tsum tau lub tshuab nqus tsev degree, thiab ces pib lub hwj chim ntawm cua sov.

Thaum lub sij hawm tag nrho cov txheej txheem ntawm kub nce thiab cua sov, lub tshuab nqus tsev yuav tsum ua hauj lwm mus ntxiv kom lub nqus tsev kawm ntawv nyob rau hauv lub cub tawg, offset cov huab cua to ntawm ntau yam interfaces ntawm lub tshuab nqus tsev system thiab lub brazing rauv, tso tawm cov pa roj thiab chav adsorbed ntawm lub tshuab nqus tsev vacuum system. furnace phab ntsa, fixture thiab weldment, volatilization ntawm hlau thiab oxide, thiab lwm yam, thiaj li yuav txo tau qhov tseeb huab cua.Muaj ob hom nqus brazing: siab nqus brazing thiab ib nrab nqus tsev (nqus nqus tsev vacuum) brazing.Lub tshuab nqus tsev siab yog qhov tsim nyog rau brazing lub hauv paus hlau uas nws oxide nyuaj rau decompose (xws li npib tsib xee puag superalloy).Ib nrab lub tshuab nqus tsev brazing yog siv rau lub sijhawm uas lub hauv paus hlau los yog muab tub lim hlau volatilizes nyob rau hauv qhov kub thiab txias thiab lub tshuab nqus tsev siab.

Thaum muaj kev ceev faj tshwj xeeb yuav tsum tau ua kom ntseeg tau siab purity, lub tshuab nqus tsev purification txoj kev yuav tsum tau saws ua ntej qhuav hydrogen brazing.Ib yam li ntawd, siv cov hydrogen qhuav los yog inert gas purification txoj kev ua ntej lub tshuab nqus tsev yuav pab kom tau txais txiaj ntsig zoo hauv lub tshuab nqus tsev siab.

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Post lub sij hawm: Jun-21-2022