Aluminium Tubes Induction Brazing

Txhawm rau txhawm rau txhim kho kev ua haujlwm thiab txo cov nyhuv thermal ntawm cov cua sov hlau, lub induction brazing technology yog npaj. Qhov zoo ntawm cov thev naus laus zis no feem ntau yog nyob rau hauv qhov tseeb ntawm cov cua sov nkag mus rau cov pob qij txha brazed. Raws li cov txiaj ntsig ntawm cov lej simulation nws yog tom qab ntawd tuaj yeem tsim qhov tsis tsim nyog kom ua tiav qhov kub thiab txias hauv lub sijhawm xav tau. Lub hom phiaj yog kom txo qis lub sij hawm no kom tsis txhob muaj qhov tsis zoo thermal cuam tshuam rau cov hlau thaum lub sij hawm metallurgical koom..Cov txiaj ntsig ntawm cov lej simulation qhia tau hais tias kev nce zaus tam sim no ua rau muaj qhov siab tshaj plaws ntawm qhov kub thiab txias hauv thaj chaw ntawm cov hlau sib koom. Nrog kev nce tam sim no, qhov txo qis ntawm lub sijhawm xav tau kom ncav cuag qhov kub ntawm brazing tau pom.

Qhov zoo ntawm induction brazing ntawm aluminium vs. torch los yog nplaim brazing

Qhov qis melting kub ntawm aluminium puag hlau ua ke nrog qhov nqaim txheej txheem qhov rais ntawm braze alloys siv yog ib qho kev sib tw thaum lub teeb brazing. Qhov tsis muaj xim hloov thaum cua sov aluminium tsis muab cov neeg ua haujlwm braze ib qho kev pom pom tias txhuas tau mus txog qhov kub thiab txias. Cov tswv lag luam braze qhia ntau qhov sib txawv thaum lub teeb ci ntsa iab. Ntawm no muaj xws li teeb taws teeb thiab nplaim taws; nyob deb ntawm lub teeb mus rau qhov chaw yog brazed; qhov chaw ntawm nplaim taws txheeb ze rau qhov chaw raug koom nrog; thiab ntau dua.

Yog vim li cas xav txog kev siv induction cua sov Thaum brazing aluminium muaj xws li:

  • Ceev ceev, cua kub ceev
  • Tswj tau, meej thaum tshav kub kub tswj
  • Xaiv (localized) tshav kub
  • Cov kab ntau lawm adaptability thiab kev koom ua ke
  • Txhim kho fixture lub neej thiab simplicity
  • Repeatable, txhim khu kev qha brazed pob qij txha
  • Txhim kho kev nyab xeeb

Kev vam meej induction brazing ntawm aluminium Cheebtsam yog nyob ntawm kev tsim induction cua coils txhawm rau tsom cov hluav taws xob hluav taws xob hluav taws xob hluav taws xob rau hauv cov cheeb tsam yuav tsum tau brazed thiab kom sov lawv uniformly kom lub braze alloy melts thiab ntws zoo. Induction coils tsim tsis raug tuaj yeem ua rau qee qhov chaw raug overheated thiab lwm qhov chaw tsis tau txais hluav taws xob txaus uas ua rau muaj kev sib txuas tsis tiav.

Rau ib tug raug brazed aluminium raj sib koom tes, tus neeg teb xov tooj nruab ib lub nplhaib aluminium braze, feem ntau muaj flux, nyob rau hauv lub txhuas raj thiab ntxig rau qhov no mus rau lwm lub raj txuas los yog ib qho thaiv. Tom qab ntawd cov khoom yog muab tso rau hauv ib qho induction kauj thiab rhuab. Nyob rau hauv cov txheej txheem ib txwm, lub braze muab tub lim hlau yaj thiab ntws mus rau hauv kev sib koom ua ke vim kev ua haujlwm ntawm capillary.

Vim li cas induction braze vs. torch braze aluminium Cheebtsam?

Ua ntej, me ntsis keeb kwm yav dhau ntawm cov txhuas alloys uas niaj hnub no thiab cov txhuas txhuas braze thiab solders siv rau kev koom ua ke. Brazing aluminium Cheebtsam yog qhov nyuaj dua li cov khoom siv tooj liab. Tooj liab melts ntawm 1980 ° F (1083 ° C) thiab nws hloov xim raws li nws yog rhuab. Aluminium alloys feem ntau siv nyob rau hauv HVAC systems pib yaj ntawm kwv yees li 1190 ° F (643 ° C) thiab tsis muab ib qho kev pom cues, xws li xim hloov, vim nws heats.

Kev tswj qhov kub thiab txias yog qhov yuav tsum tau muaj qhov sib txawv ntawm qhov sib txawv ntawm cov melting thiab brazing kub rau txhuas, nyob ntawm seb cov aluminium puag hlau, braze muab tub lim hlau, thiab qhov loj ntawm cov khoom yuav tsum tau brazed. Piv txwv li, qhov sib txawv ntawm qhov kub thiab txias ntawm ob qho txhuas txhuas alloys, 3003 series txhuas, thiab 6061 series txhuas, thiab cov kua kub ntawm BAlSi-4 braze alloy feem ntau yog 20 ° F - lub qhov rais nqaim heev kub txheej txheem, yog li tsim nyog. tswj tau meej. Kev xaiv ntawm lub hauv paus alloys yog qhov tseem ceeb heev nrog cov tshuab aluminium uas tau raug brazed. Qhov kev coj ua zoo tshaj plaws yog txhawm rau txhawm rau ntawm qhov kub thiab txias uas qis dua qhov kub ntawm cov hlau alloys ua rau cov khoom sib xyaw ua ke.

AWS A5.8 ClassificationNominal Chemical CompositionSolidus ° F (° C)Liquidus ° F (° C)Brazing Kub
BAIS-386% Al 10% Si 4% Cu970 (521)1085 (855)1085 ~ 1120 ° F
BAISI-488% aL 12% Si1070 (577)1080 (582)1080 ~ 1120 ° F
78 Zn 22% Al826 (441)905 (471)905 ~ 950 ° F
98% Zn 2% Al715 (379)725 (385)725 ~ 765 ° F

Nws yuav tsum raug sau tseg tias galvanic corrosion tuaj yeem tshwm sim ntawm thaj chaw zinc nplua nuj thiab txhuas. Raws li tau sau tseg hauv daim duab galvanic hauv daim duab 1, zinc tsis tshua muaj txiaj ntsig thiab zoo li anodic piv rau txhuas. Qhov qis dua qhov muaj peev xwm sib txawv, qhov qis dua ntawm corrosion. Qhov muaj peev xwm sib txawv ntawm zinc thiab txhuas yog tsawg heev piv rau qhov muaj peev xwm ntawm txhuas thiab tooj liab.

Lwm qhov tshwm sim thaum aluminium yog brazed nrog zinc alloy yog pitting. Hauv zos cell lossis pitting corrosion tuaj yeem tshwm sim ntawm ib qho hlau. Aluminium feem ntau tiv thaiv los ntawm ib qho nyuaj, nyias zaj duab xis uas ua rau ntawm qhov chaw thaum lawv raug oxygen (aluminium oxide) tab sis thaum lub flux tshem tawm cov txheej tiv thaiv oxide no, kev tawg ntawm txhuas tuaj yeem tshwm sim. Ntev npaum li cas cov hlau muab tub lim tseem molten, qhov loj dua qhov tawg.

Aluminium tsim cov txheej txheej tawv oxide thaum lub sij hawm brazing, yog li kev siv cov flux yog qhov tseem ceeb. Fluxing aluminium Cheebtsam tuaj yeem ua tiav nyias ua ntej brazing lossis aluminium brazing alloy uas muaj flux tuaj yeem muab tso rau hauv cov txheej txheem brazing. Nyob ntawm seb hom flux siv (corrosive vs. non-corrosive), ib kauj ruam ntxiv yuav tsum tau yog tias cov flux residue yuav tsum tau muab tshem tawm tom qab brazing. Tham nrog lub chaw tsim khoom braze thiab flux kom tau txais kev pom zoo ntawm brazing alloy thiab flux raws li cov ntaub ntawv tau koom nrog thiab qhov xav tau ntawm brazing kub.

 

Aluminium Tubes Induction Brazing