1, tshuaj ntxuav tu
Kev tu tshuaj yog ua kom muaj kev nyab xeeb thiab ruaj khov, tsim kev tu lub voj hlau thiab me me, kev ua haujlwm ntawm cov khoom ua haujlwm. Muaj ob txoj hauv kev, kev tiv thaiv kev tu thiab txhuam. Acetone, roj, kerosene thiab lwm cov organic solvents tuaj yeem siv los tshem tawm cov roj nplaum, ntxuav 3 min ~ 7 min (ntshiab txhuas lub sijhawm me ntsis, tiam sis tsis tshaj 20 min) nrog 40 ℃ ~ 70 ℃ 5% ~ 10% NaOH kua alkaline. Tso dej yaug. ces muab khaws cia 1 min ~ 3 feeb nrog 30% HNO 3 hauv chav sov li 60 ℃, dej yaug. Thaum kawg, ua kom nws qhuav.
2. Ntxuav txhua yam
Nyob rau hauv cov loj loj, voj voog ntev, ntau txheej vuam khoom lossis paug tom qab tshuaj ntxuav tu, feem ntau siv tshuaj ntxuav vaj tse. Ua ntej, siv cov acetone, roj av thiab lwm cov tshuaj organic los so kom tshem tawm cov roj tawm, kom txhuam kom ncaj qha mus txog lub tshuab ntsuas kub ntawm 0.15mm ~ 0.2 hli copper hlau txhuam los yog hlau tsis txhuam txhuam. Feem ntau, nws tsis yog tswv yim los siv kev sib tsoo los yog cov xuab zeb tsoo rau txhuam, kom tsis txhob xuab zeb dua seem ntawm cov hlau. Tsis tas li no, scraper thiab cov ntaub ntawv tseem muaj los ntxuav cov nplaum yuav tsum tau welded.
Tom qab tu, yog lub sijhawm ntev tshaj (ntev dua 24 h), nws yuav tsum tau muab tso rau.
3. Cov phaj qaum
Aluminium alloy lub zog ntawm kub yog qhov qis qis, kua txhuas cov txheej txheem ua tau zoo, thaum welding weld hlau nws cov dej khov tshwm sim. Yuav kom paub meej tias qhov nkag mus ntawm qhov vuam tsoo thiab tsis vau, feem ntau siv ncoo los txhawb lub pas dej thiab cov hlau ze. Cov phom thaub qab yuav yog graphite phaj, stainless hlau phaj, cov hlau phaj, tooj liab lossis tooj liab. Ua ib daim phiaj zom zaws ntawm lub phaj qaum sab nraud kom paub meej tias lub pob weld yog tsim. Nws tuaj yeem tsim tau yam tsis muaj thaub qab, tab sis nws yuav tsum tau siv kev lag luam los sis cov tswv yim tsis nrawm heev ntawm kev siv fais fab thiab lwm cov kev ua haujlwm tshaj tawm.
Preheating ua ntej welding. Feem ntau, nyias, me me txhim khu daim yuav tsum tsis preheat. Aluminium nrog cov thickness ntawm 10mm ~ 15 hli yuav preheated ua ntej welding. Raws li qhov sib txawv ntawm aluminium alloy preheating kub yog 100 ℃ ~ 200 ℃. Nws muaj peev xwm raug rhuav tshem los ntawm oxyacetylene nplaim taws, hluav taws xob rauv taws lossis hluav taws xob. Kev Preheating tuaj yeem ua rau lub vuam qhov txo qis deformation thiab xws li porosity.
4. Kev kho mob tom qab
1. Tom qab welding, residual flux thiab slag tshuav nyob rau ntawm qhov chaw ntawm lub weld yuav ua kev puas tsuaj zaj duab xis ntawm lub txhuas ntom thiab qee zaus corrode aluminium qhov chaw, yog li yuav tsum ntxuav qhov chaw tom qab welding. Cov khoom ua haujlwm uas muaj cov qauv yooj yim thiab cov kev cai yuav raug muab ntxuav los ntawm kev yooj yim xws li cov dej kub ntxuav los yog cov thoob ntub dej.Thaum yuav tsum ua thiab txoj kev zoo aluminium, tom qab txhuam nrog bristle txhuam hauv dej kub, Ces immersion huv si 2% ~ 3 % ntawm chromic anhydride lossis potassium dichromate immersion 5 min ~ 10 min ntawm 60-80 ℃. Txhuam nrog txhuam bristle txhuam, ces yaug hauv dej kub. Thaum kawg, ua kom nws qhuav.
2, Feem ntau, Aluminium daim ntawv tsis yuav tsum tau kho cua sov tom qab welding.