Iityhubhu zeAluminiyam zokungeniswa kweBrazing

Ukuze kwandiswe ukusebenza kakuhle kunye nokunciphisa isiphumo thermal ukufudumeza metal, i ukukhangela ibhondi iteknoloji iyacetywa. I-advanteji yale teknoloji iqulethe ubukhulu becala kwindawo echanekileyo yokufudumeza enikezelwa kumalungu adibeneyo. Ngokusekelwe kwiziphumo zokulinganisa kwamanani kwakunokwenzeka ukuyila iiparitha eziyimfuneko ukufezekisa amaqondo okushisa okutshisa ngexesha elifunwayo. Injongo yayikukucutha eli xesha ukunqanda isiphumo sobushushu esingafunekiyo kwiintsimbi ngexesha lokudibanisa i-metallurgical..Iziphumo zokulinganisa amanani zibonise ukuba ukonyuka kobuninzi bangoku kukhokelele kugxininiso lwamaqondo obushushu aphezulu kwiindawo ezingaphezulu zeentsimbi ezidityanisiweyo. Ngokunyuka kwangoku, ukuncitshiswa kwexesha elifunekayo ekufikeleleni kwiqondo lokushisa lokutshisa kwabonwa.

Izinto eziluncedo zokubrashiswa kwe-aluminiyam ngokuchasene netotshi okanye ukuvutha komlilo

Ubushushu obuphantsi bokunyibilika besiseko sesinyithi se-aluminiyam zidityaniswe nefestile yenkqubo yobushushu emxinwa yealloyi zobhedu ezisetyenzisiweyo ngumngeni xa itotshi ikhanyisa. Ukungabikho kokutshintsha kombala ngelixa i-aluminium yokufudumala ayiboneleli ngabaqhubi bebraze nayiphi na into ebonisa ukuba i-aluminium ifikelele kwiqondo lokushisa elifanelekileyo. Abaqhubi beBraze bazisa inani lezinto ezahlukeneyo xa kukhanyisa itotshi. Phakathi kwezi ziquka ukusetwa kwetotshi kunye nohlobo lomlilo; umgama ukusuka kwitotshi ukuya kwiindawo ezifakwe ibrazed; indawo yedangatye xa kuthelekiswa namalungu adityanisiweyo; kunye nokuninzi.

Izizathu zokuqwalasela ukusebenzisa lokutshisa xa brazing aluminiyam ziquka:

  • Ukufudumala ngokukhawuleza, ngokukhawuleza
  • Ukulawula ubushushu obuchanekileyo
  • Ukushisa okukhethiweyo (okwasekhaya).
  • Ukulungelelanisa umgca wemveliso kunye nokudibanisa
  • Ubomi obuphuculweyo bomdlalo kunye nokulula
  • Amalungu aphindaphindiweyo, athembekileyo ebrazed
  • Ukuphuculwa kokhuseleko

Ukuphumelela ukunyanzeliswa kwebrashi yezinto zealuminiyam kuxhomekeke kakhulu kuyilo iikhoyili zokufudumala ukujolisa amandla obushushu be-electromagnetic kwiindawo eziza kugalelwa kunye nokuzifudumeza ngokufanayo ukuze ialloy yebraze inyibilike kwaye ihambe kakuhle. Iikhoyili ze-induction eziyilwe ngendlela engafanelekanga zinokukhokelela ekubeni ezinye iindawo zitshiswe ngokugqithisileyo kwaye ezinye iindawo zingafumani mandla obushushu aneleyo okukhokelela ekudibaneni kwebraze okungaphelelanga.

Kwijoyinti yetyhubhu yealuminiyam eqhelekileyo, umsebenzi ufaka iringi ye-aluminiyam yebraze, ehlala iqulethe i-flux, kwityhubhu ye-aluminiyam kwaye ayifake kwenye ityhubhu eyandisiweyo okanye ibhloko ehambelanayo. Emva koko iinxalenye zifakwe kwikhoyili ye-induction kwaye zishushu. Kwinkqubo eqhelekileyo, iintsimbi zokuzalisa i-braze ziyanyibilika kwaye zigeleze kwi-joint interface ngenxa yesenzo se-capillary.

Kutheni ibraze yoveliso vs.

Okokuqala, imvelaphi encinci yealluminiyam eqhelekileyo exhaphakileyo namhlanje kunye nebraze ye-aluminium eqhelekileyo kunye nee-solder ezisetyenziselwa ukujoyina. Amacandelo e-aluminiyam e-Brazing anzima kakhulu kunezixhobo zobhedu. Ubhedu lunyibilika ngo-1980°F (1083°C) kwaye lutshintsha umbala xa lufudunyezwa. I-alloys ye-aluminiyam ehlala isetyenziswa kwiinkqubo ze-HVAC iqala ukunyibilika malunga ne-1190 ° F (643 ° C) kwaye ayiboneleli naziphi na iimpawu ezibonakalayo, ezifana nokutshintsha kombala, njengoko ishushu.

Ulawulo lweqondo lobushushu oluchanekileyo kakhulu luyafuneka njengomahluko kwiqondo lobushushu lokunyibilika kunye nokubeka i-aluminiyam, ngokuxhomekeke kwisiseko sesinyithi se-aluminiyam, isinyithi sokugcwaliswa kwebraze, kunye nobunzima bamacandelo amele ukugaywa. Umzekelo, Umahluko weqondo lobushushu phakathi kobushushu be-alloyidi ezimbini eziqhelekileyo ze-aluminium, i-3003 series aluminium, kunye ne-6061 series aluminium, kunye nobushushu bolwelo obusetyenziswa rhoqo kwi-BAlSi-4 ialloy ye-braze yi-20 ° F - ifestile yenkqubo yobushushu emxinwa kakhulu, ngaloo ndlela iyimfuneko. ulawulo oluchanekileyo. Ukukhethwa kwe-alloys yesiseko kubaluleke kakhulu kunye neenkqubo ze-aluminium ezixutywayo. Olona qheliselo lungcono kukugada kwiqondo lobushushu elingaphantsi kobushushu be-solidus ye-alloys ukwenza amacandelo adityaniswe kunye.

AWS A5.8 Ukuhlelwa Ukuqulunqwa kweMichiza okuSibizo I-Solidus °F (°C) Ulwelo °F(°C) Ubushushu beBrazing
BASI-3 86% Al 10%Si 4%Cu 970 (521) 1085 (855) 1085~1120 °F
I-BAISI-4 88% L 12%Si 1070 (577) 1080 (582) 1080~1120 °F
78 Zn 22%Al 826 (441) 905 (471) 905~950 °F
98% Zn 2%Al 715 (379) 725 (385) 725~765 °F

Kufuneka kuqatshelwe ukuba i-galvanic corrosion ingenzeka phakathi kweendawo ezityebileyo ze-zinc kunye ne-aluminium. Njengoko kuphawuliwe kwitshathi yegalvanic kuMfanekiso 1, i-zinc ayihloniphekanga kwaye ithande ukuba yi-anodic xa ithelekiswa ne-aluminium. Okukhona usezantsi umahluko onokwenzeka, kokukhona usezantsi isantya sokudleka. Umahluko onokubakho phakathi kwe-zinc kunye ne-aluminiyam incinci xa kuthelekiswa namandla phakathi kwe-aluminiyam kunye nobhedu.

Enye into eyenzekayo xa i-aluminiyam ibrazed nge-alloy ye-zinc yi-pitting. Iseli yendawo okanye i-corrosion ye-pitting ingenzeka nakweyiphi na isinyithi. I-aluminiyam ngokuqhelekileyo ikhuselwe yifilimu eqinile, ebhityileyo eyenza phezulu xa idibene neoksijini (i-aluminium oxide) kodwa xa i-flux isusa le maleko ye-oxide ekhuselayo, ukuchithwa kwe-aluminium kunokwenzeka. Ixesha elide isinyithi sokuzalisa sihlala sinyibilikisiwe, ukuchithwa kubi kakhulu.

I-Aluminiyam yenza umaleko we-oxide onzima ngexesha lokuqhaqha, ngoko ke ukusetyenziswa kwe-flux kubalulekile. Amacandelo e-aluminium e-fluxing angenziwa ngokwahlukileyo ngaphambi kokutshiza okanye i-aluminium brazing alloy equkethe i-flux inokufakwa kwinkqubo yokuqhafaza. Ngokuxhomekeke kuhlobo lwe-flux esetyenzisiweyo (i-corrosive vs. non-corrosive), inyathelo elongezelelweyo linokufuneka ukuba i-residu ye-flux kufuneka isuswe emva kokuqhaqha. Qhagamshelana nomenzi webraze kunye ne-flux ukuze ufumane iingcebiso malunga ne-alloy ye-brazing kunye ne-flux esekelwe kwizinto ezidityanisiweyo kunye namaqondo okushisa alindelekileyo.

 

Iityhubhu zeAluminiyam zokungeniswa kweBrazing