Brazing ntawm cov hlau cam khwb cia

1. Cov khoom siv sib txhuam

(1) Kev siv cov hlau cam khwb cia hlau brazing filler feem ntau yog siv cov hlau tooj liab zinc brazing filler thiab cov hlau nyiaj tooj liab brazing filler. Cov hom hlau tooj liab zinc brazing filler feem ntau yog b-cu62znnimusir, b-cu60zusnr thiab b-cu58znfer. Lub zog tensile ntawm cov hlau cam khwb cia sib koom ua ke feem ntau ncav cuag 120 ~ 150MPa. Raws li cov hlau tooj liab zinc brazing filler, Mn, Ni, Sn, AI thiab lwm yam ntsiab lus raug ntxiv los ua kom cov hlau sib koom ua ke muaj tib lub zog nrog cov hlau hauv paus.

Qhov kub yaj ntawm cov hlau nyiaj tooj liab brazing filler yog qis. Cov qauv tsis zoo tuaj yeem zam tau thaum brazing hlau cam khwb cia. Lub pob qij brazing muaj kev ua tau zoo, tshwj xeeb tshaj yog cov hlau brazing filler uas muaj Ni, xws li b-ag50cuzncdni thiab b-ag40cuznsnni, uas ua rau lub zog sib txuas ntawm cov hlau brazing filler thiab hlau cam khwb cia txhim kho. Nws yog qhov tshwj xeeb tshaj yog rau kev brazing ntawm cov hlau cam khwb cia nodular, uas tuaj yeem ua rau lub pob qij muaj tib lub zog nrog cov hlau hauv paus.

(2) Thaum siv tooj liab thiab zinc rau brazing hlau cam khwb cia, fb301 thiab fb302 feem ntau yog siv, uas yog, borax lossis sib tov ntawm borax thiab boric acid. Tsis tas li ntawd, cov flux muaj h3bo340%, li2co316%, na2co324%, naf7.4% thiab nac112.6% zoo dua.

Thaum brazing hlau cam khwb cia nrog nyiaj tooj liab filler hlau, fluxes xws li fb101 thiab fb102 tuaj yeem xaiv tau, piv txwv li qhov sib tov ntawm borax, boric acid, potassium fluoride thiab potassium fluoroborate.

2. Kev siv tshuab txhuam

Ua ntej yuav siv hlau cam khwb cia, yuav tsum tshem tawm cov graphite, oxide, xuab zeb, roj av thiab lwm yam khoom seem ntawm qhov chaw cam khwb cia. Yuav tsum siv cov organic solvent scrubbing los tshem tawm cov roj av, thiab siv cov txheej txheem tshuab xws li xuab zeb blasting lossis shot blasting, lossis electrochemical los tshem tawm graphite thiab oxides. Tsis tas li ntawd, graphite tuaj yeem tshem tawm los ntawm kev hlawv nrog nplaim oxidizing.

Cov hlau cam khwb cia tuaj yeem ua kom sov los ntawm nplaim taws, cua sov lossis induction. Vim tias SiO2 yooj yim tsim rau ntawm qhov chaw ntawm cov hlau cam khwb cia, qhov cuam tshuam brazing hauv huab cua tiv thaiv tsis zoo. Feem ntau, brazing flux yog siv rau brazing. Thaum brazing cov khoom loj nrog tooj liab zinc brazing filler hlau, ib txheej ntawm brazing flux yuav tsum tau txau rau ntawm qhov chaw ntxuav ua ntej, thiab tom qab ntawd cov khoom ua haujlwm yuav tsum tau muab tso rau hauv lub cub tawg rau cua sov lossis cua sov nrog lub teeb vuam. Thaum cov khoom ua haujlwm raug cua sov txog li 800 ℃, ntxiv cov flux ntxiv, cua sov nws mus rau qhov kub brazing, thiab tom qab ntawd khawb cov khoom siv koob ntawm ntug ntawm qhov sib koom ua ke kom yaj cov solder thiab sau qhov sib txawv. Txhawm rau txhim kho lub zog ntawm brazed sib koom ua ke, kev kho mob annealing yuav tsum tau ua ntawm 700 ~ 750 ℃ ​​rau 20 feeb tom qab brazing, thiab tom qab ntawd qeeb qeeb txias yuav tsum tau ua.

Tom qab brazing, cov dej ntws ntau dhau thiab cov khoom seem tuaj yeem tshem tawm los ntawm kev ntxuav nrog dej sov. Yog tias nws nyuaj rau tshem tawm, nws tuaj yeem ntxuav nrog 10% sulfuric acid aqueous solution lossis 5% ~ 10% phosphoric acid aqueous solution, thiab tom qab ntawd ntxuav nrog dej huv.