1. Ihe na-agba agba
(1) Ngwongwo ihe eji eme brazing na carbides cimented na-ejikarị ọla kọpa dị ọcha, ọla kọpa zinc na ọla ọla kọpa brazing ọla.Ọla kọpa dị ọcha nwere ezigbo mmiri mmiri maka ụdị carbide cimented niile, mana enwere ike nweta nsonaazụ kacha mma site na brazing na mbelata ikuku nke hydrogen.N'otu oge ahụ, n'ihi oke ọkụ brazing, nrụgide dị na nkwonkwo dị ukwuu, nke na-eduga n'ịbawanye ụba nke mgbawa.Ike ịkpụ nke nkwonkwo nke ejiri ọla kọpa dị ọcha mee ihe dị ka 150MPa, na nkwonkwo plasticity dịkwa elu, ma ọ dịghị adabara maka ọrụ okpomọkụ dị elu.
Ọla ọla kọpa zinc bụ metal filler a na-ejikarị eme ihe maka igwe brazing steels na carbides cimented.Iji meziwanye wettability nke onye na-ere ahịa na ike nke nkwonkwo, Mn, Ni, Fe na ihe ndị ọzọ na-emepụta ihe na-agbakwunye na solder.Dịka ọmụmaatụ, a na-agbakwunye w (MN) 4% na b-cu58znmn iji mee ka ike nke cemented carbide brazed nkwonkwo rute 300 ~ 320MPa na ụlọ okpomọkụ;Ọ ka nwere ike idowe 220 ~ 240mpa na 320 ℃.Ịgbakwunye obere ego nke CO na ndabere nke b-cu58znmn nwere ike ime ka ike ọkpụkpụ nke nkwonkwo brazed rute 350Mpa, ma nwee mmetụta siri ike na ike ike ọgwụgwụ, na-eme ka ndụ ọrụ dịkwuo mma nke ịkpụ ngwá ọrụ na ngwá ọrụ egwu nkume.
Ebe mgbaze dị ala nke ọla kọpa brazing filler metal na obere nrụgide okpomọkụ nke nkwonkwo brazed bara uru iji belata mgbawa nke carbide cimented n'oge brazing.Iji mee ka wettability nke onye na-ere ahịa dịkwuo mma ma melite ike na okpomọkụ na-arụ ọrụ nke nkwonkwo, Mn, Ni na ihe ndị ọzọ alloy na-agbakwunye na solder.Ka ihe atụ, b-ag50cuzncdni solder nwere magburu onwe wettability ka cemented carbide, na brazed nkwonkwo nwere ezi keukwu Njirimara.
Na mgbakwunye na ụdị atọ dị n'elu brazing filler metals, Mn based na Ni based brazing filler metals, dị ka b-mn50nicucrco na b-ni75crsib, enwere ike ịhọrọ maka carbide cimented na-arụ ọrụ karịa 500 ℃ ma na-achọ ike nkwonkwo dị elu.Maka brazing nke igwe na-agba ọsọ dị elu, a ga-ahọrọ metal brazing pụrụ iche nke nwere okpomọkụ na-adaba na okpomọkụ na-ekpo ọkụ.A na-ekewa metal filler a ụzọ abụọ: otu bụ ferromanganese ụdị filler metal, nke a na-emekarị nke ferromanganese na borax.Ike shiee nke nkwonkwo brazed n'ozuzu banyere 100MPa, ma nkwonkwo na-adịkarị mfe mgbawa;Ụdị ọla kọpa ọzọ pụrụ iche nke nwere Ni, Fe, Mn na Si adịghị mfe ịmepụta mgbawa na nkwonkwo brazed, na ike ịkpụ ya nwere ike ịbawanye ruo 300mpa.
(2) Nhọrọ nke brazing flux na ikpuchi gas brazing flux ga-adaba na metal ala na ndochi a ga-agbakọ.Mgbe brazing ngwá ọrụ ígwè na simenti carbide, brazing flux a na-ejikarị bụ borax na boric acid, na ụfọdụ fluorides (KF, NaF, CaF2, wdg) na-agbakwunyere.Fb301, fb302 na fb105 fluxes na-eji ọla kọpa solder, na fb101 ~ fb104 fluxes na-eji ọlaọcha ọla kọpa solder.A na-ejikarị borax flux mgbe a na-eji metal brazing pụrụ iche na-eme ka ígwè na-agba ọsọ dị elu.
Iji gbochie oxidation nke ígwè ngwá ọrụ n'oge brazing kpo oku na iji zere ihicha mgbe brazing, gas na-echebe brazing nwere ike iji.The na-echebe gas nwere ike ịbụ ma inert gas ma ọ bụ ibelata gas, na igirigi nke gas ga-adị ala karịa -40 ℃ Cemented carbide nwere ike brazed n'okpuru nchebe nke hydrogen, na igirigi nke hydrogen chọrọ ga-adị ala karịa -59 ℃
2. teknụzụ brazing
A ghaghị ihicha ígwè ngwá ọrụ ahụ tupu ịkwanye brazing, na elu igwe a na-arụ ọrụ ekwesịghị ịdị nro nke ukwuu iji mee ka mmiri na-agbasa ihe na ịgbasa brazing.N'elu nke cemented carbide ga-abụ ájá gbawara tupu a na-agbawa ya, ma ọ bụ jiri silicon carbide ma ọ bụ wheel egweri diamond na-egbu maramara iji wepụ carbon karịrị akarị n'elu, ka e wee mee ya site na brazing filler metal n'oge brazing.Carbide cemented nwere titanium carbide siri ike mmiri.A na-etinye ọla kọpa oxide ma ọ bụ nickel oxide paste n'elu ya n'ụzọ ọhụrụ wee sie ya na ikuku na-ebelata iji mee mgbanwe ọla kọpa ma ọ bụ nickel n'elu, ka ọ na-abawanye wettability nke solder siri ike.
Ekwesịrị ịme brazing nke ígwè ọrụ carbon n'ihu ma ọ bụ n'otu oge ahụ dị ka usoro nkwụsịtụ.Ọ bụrụ na a na-eme brazing tupu usoro nkwụsịtụ ahụ, okpomọkụ siri ike nke metal filler ejiri ga-adị elu karịa oke okpomọkụ na-ekpo ọkụ, nke mere na welded ka nwere ike zuru oke mgbe ọ na-ekpo ọkụ na okpomọkụ na-ekpo ọkụ na-enweghị ọdịda.Mgbe a na-ejikọta brazing na quenching, a ga-ahọrọ ígwè na-ejupụta na okpomọkụ siri ike dị nso na okpomọkụ quenching.
Alloy tool steel nwere ọtụtụ ihe dị iche iche.Kwesịrị ekwesị brazing filler metal, usoro ọgwụgwọ okpomọkụ na nkà na ụzụ nke ijikọta brazing na usoro ọgwụgwọ okpomọkụ dị ka ụdị ígwè a kapịrị ọnụ si dị, ka e wee nweta ezigbo nkwonkwo nkwonkwo.
The quenching okpomọkụ nke elu-ọsọ ígwè bụ n'ozuzu elu karịa agbaze okpomọkụ nke ọla kọpa ọla kọpa na ọla kọpa zinc solder, n'ihi ya, ọ dị mkpa quench tupu brazing na braze n'oge ma ọ bụ mgbe secondary tempering.Ọ bụrụ na a na-achọ ịnyụ anyụ ka emechara brazing, ọ bụ naanị igwe ndochi brazing pụrụ iche a kpọtụrụ aha n'elu ka a ga-eji mee brazing.Mgbe ị na-eme brazing ngwa ngwa nchara ígwè dị elu, ọ dị mma iji ọkụ ọkụ coke.Mgbe agbazere brazing filler metal, wepụta ngwá ọrụ ịkpụ ma pịa ya ozugbo, wepụ metal brazing ngafe, wee mebie mmanụ, wee were iwe na 550 ~ 570 ℃.
Mgbe ị na-eji ogwe ígwè eme ihe na-eme ka cimented carbide blade na-eji ígwè ígwè eme ihe, a ghaghị ịnakwere usoro nke ịbawanye ọdịiche nke brazing na itinye nkwụghachi ụgwọ plastik na oghere brazing, na ngwa ngwa oyi kwesịrị ime mgbe ịgbado ọkụ iji belata nrụgide brazing, gbochie mgbawa na mgbawa. ịgbatị ndụ ọrụ nke mgbakọ carbide cimented.
Mgbe eriri welding gachara, a ga-eji mmiri ọkụ na-asachapụ ihe fọdụrụ na weldment na mmiri ọkụ ma ọ bụ ngwakọta mkpochapụ slag n'ozuzu, wee were ngwọta pickling kwesịrị ekwesị wee wepụ ihe nkiri oxide na mkpanaka ngwaọrụ ntọala.Otú ọ dị, kpachara anya ka ị ghara iji ngwọta nitric acid iji gbochie corrosion nke metal brazing nkwonkwo.
Oge nzipu: Jun-13-2022