Brazing na aiki karafa

1. Brazing abu

(1) Titanium da kayan haɗin gwiwar sa ba safai ake gogawa da solder mai laushi ba.Ƙarfan filler ɗin da ake amfani da shi don brazing galibi sun haɗa da tushe na azurfa, tushe na aluminum, tushe titanium ko tushe zirconium titanium.

Azurfa tushen solder ne yafi amfani ga aka gyara tare da aiki zafin jiki kasa da 540 ℃.Ƙungiyoyin da ke amfani da solder mai tsantsa na azurfa suna da ƙarancin ƙarfi, mai sauƙin fashe, da rashin juriya na lalata da juriya na iskar shaka.Matsakaicin zafin jiki na mai siyarwar Ag Cu ya yi ƙasa da na azurfa, amma jigon yana raguwa tare da haɓaka abun ciki na Cu.The Ag Cu solder dauke da karamin adadin Li iya inganta wettability da alloying digiri tsakanin solder da tushe karfe.AG Li solder yana da halayen ƙarancin narkewa da ƙarfi mai ƙarfi.Ya dace da brazing titanium da titanium gami a cikin yanayin tsaro.Koyaya, ƙwanƙwasa ƙura zai gurɓata tanderun saboda ƙawancen Li.Ag-5al- (0.5 ~ 1.0) Mn filler karfe shine mafificin filler karfe don abubuwan da aka gyara titanium alloy na bakin ciki.Haɗin haɗin gwiwa yana da kyakkyawan iskar shaka da juriya na lalata.Ƙarfin juzu'in titanium da haɗin gwiwa na titanium gami da ƙarfe mai filler tushe an nuna shi a cikin Tebura 12.

Table 12 brazing tsarin sigogi da haɗin gwiwa ƙarfin titanium da titanium gami

Table 12 brazing process parameters and joint strength of titanium and titanium alloys

Matsakaicin zafin jiki na tushen aluminium yana da ƙasa, wanda ba zai haifar da abin da ya faru na titanium alloy β Canjin lokaci yana rage buƙatun zaɓin kayan aikin brazing da sifofi ba.Mu'amalar da ke tsakanin karfen filler da karfen tushe ba su da yawa, kuma rushewar da yaduwa ba a bayyane yake ba, amma filastik na karfen filler yana da kyau, kuma yana da sauki a mirgina karfen filler da karfen tushe tare, don haka yana da kyau. ya dace sosai don brazing titanium alloy radiator, tsarin saƙar zuma da tsarin laminate.

Tushen titanium ko titanium zirconium tushen jujjuyawar gabaɗaya sun ƙunshi Cu, Ni da sauran abubuwa, waɗanda zasu iya yaɗuwa cikin matrix da sauri kuma suyi amsa da titanium yayin brazing, yana haifar da lalata matrix da samuwar Layer mai gatsewa.Don haka, ya kamata a kula sosai da zafin jiki na brazing da lokacin riƙewa a lokacin brazing, kuma bai kamata a yi amfani da shi don murƙushe sifofin bangon bakin ciki ba gwargwadon yiwuwa.B-ti48zr48be shine samfurin Ti Zr na yau da kullun.Yana da kyau wettability zuwa titanium, kuma tushe karfe ba shi da hali na hatsi girma a lokacin brazing.

(2) Brazing filler karafa ga zirconium da tushe gami brazing na zirconium da tushe gami yafi hada da b-zr50ag50, b-zr76sn24, b-zr95be5, da dai sauransu, wanda aka yadu amfani a brazing na zirconium gami bututu na nukiliya ikon reactors.

(3) Juyin juyayi da titanium mai karewa, zirconium da alloys na tushe na iya samun sakamako mai gamsarwa a cikin vacuum da inert yanayi (helium da argon).Dole ne a yi amfani da argon mai tsafta don yin garkuwar garkuwar argon, kuma raɓa dole ne ya zama -54 ℃ ko ƙasa.Dole ne a yi amfani da juzu'i na musamman mai ɗauke da fluoride da chloride na ƙarfe Na, K da Li don murƙushe wuta.

2. Fasahar Brazing

Kafin brazing, dole ne a tsaftace farfajiyar sosai, a shafe shi kuma a cire fim din oxide.Za a cire fim ɗin oxide mai kauri ta hanyar injina, hanyar fashewar yashi ko hanyar wankan gishiri narkakkar.Za a iya kawar da fim din oxide na bakin ciki a cikin maganin da ke dauke da 20% ~ 40% nitric acid da 2% hydrofluoric acid.

Ti, Zr da gaminsu ba a yarda su tuntuɓar saman haɗin gwiwa tare da iska yayin dumama brazing.Za a iya yin brazing a ƙarƙashin kariya ta iska ko inert gas.Ana iya amfani da dumama shigar da mitar ko dumama cikin kariya.Dumamar shigar da ita ita ce hanya mafi kyau don ƙananan sassa masu ma'ana, yayin da brazing a cikin tanderu ya fi fa'ida ga manyan abubuwa masu rikitarwa.

Ni Cr, W, Mo, Ta da sauran kayan za a zaɓi su azaman abubuwan dumama don brazing Ti, Zr da kayan haɗin gwiwa.Kayan aiki tare da fallasa graphite azaman abubuwan dumama ba za a yi amfani da su ba don guje wa gurɓataccen carbon.Za a yi kayan aikin brazing da kayan da ke da ƙarfin zafi mai kyau, irin wannan haɓakar haɓakar zafin jiki zuwa Ti ko Zr, da ƙarancin amsawa tare da ƙarfe tushe.


Lokacin aikawa: Juni-13-2022