1, Hluav taws xob vuam. Siv ib txheej ntawm flux rau ntawm phab ntsa ntxuav cov yeeb nkab, hlua cov fins rau hauv cov yeeb nkab, thiab tom qab ntawd txuas lub hwj chim ntawm ob qhov kawg ntawm lub raj fin. Qhov kub thiab txias txhawb lub melting ntawm cov hlau nyob rau hauv lub flux, welding cov yeeb nkab thiab fins ua ke.
2, Dipping txoj kev. Ua ntej immersion, oxide thiab roj stains nyob rau saum npoo ntawm lub raj thiab fins yuav tsum tau muab tshem tawm tag nrho. Nws tuaj yeem ntxuav nrog hydrochloric acid, sulfuric acid, thiab oxidants (xws li nitric acid). Nco ntsoov tias tis tooj liab yuav tsum tsuas yog ntxuav nrog dilute sulfuric acid. Tom qab ntxuav tag nrho cov finned tube, nws tuaj yeem muab tso rau hauv ib qho ammonium chloride tov uas muaj stannous chloride ua ntej muab tso rau hauv lub molten zinc (los yog tin) da dej (lub melting point ntawm zinc yog 400 degree, thiab cov tin yog 230 degree) . Cov molten zinc (los yog tin) tov ntws mus rau hauv qhov sib txawv ntawm cov fins thiab lub raj, tsis yog tsuas yog sau qhov sib txawv, tab sis kuj tsim ib txheej txheej tom qab txias. Txoj kev no yog kim thiab siv li ntawm 1.25-1.30kg ntawm zinc ib square meter ntawm tshav kub exchanger cheeb tsam.
3, Tiv tauj vuam. Weld ib sab ntawm txoj hlua (los yog winding) rau ib sab ntawm cov yeeb nkab. Thaum lub sij hawm vuam txheej txheem, cov yeeb nkab yuav tsum tsis txhob deform thiab feem ntau yuav tsum tau muab tso rau hauv lub core ncej. Lub perforation ntawm fins yuav tsum muaj ib tug folded ntug. Qhov tsis zoo yog tias nws yuav tsum muaj cov cuab yeej tshwj xeeb ntau dua thiab siv cov khoom siv vuam tshwj xeeb.
4, Expansion tube txoj kev. Siv txoj kev hydraulic (feem ntau yog nias rau siab tshaj 30 MPa) kom nthuav dav cov finned tube channel uas twb muaj lawm, kom tag nrho cov finned raj yog nruj nreem clamped rau hauv lub raj. Tsis haum rau cov kav dej steel, haum rau cov hlau tsis muaj hlau finned tub nrog zoo ductility.