Izinsimbi eziyigugu ikakhulukazi zibhekisela ku-Au, Ag, PD, Pt nezinye izinto, ezinokuhamba kahle, ukuguquguquka okushisayo, ukumelana nokugqwala kanye nezinga lokushisa eliphakeme lokuncibilika.Zisetshenziswa kakhulu ezintweni zikagesi ukwenza izingxenye zesekethe ezivulekile nezivaliwe.
(1) Izici ze-Brazing njengezinto zokuxhumana, izinsimbi eziyigugu zinezici ezivamile zendawo yokubethela encane, edinga ukuthi insimbi yokufaka insimbi ibe nokumelana nomthelela omuhle, amandla aphezulu, ukumelana okuthile kwe-oxidation, futhi ingamelana nokuhlasela kwe-arc, kodwa ayishintshi izici zezinto zokuxhumana kanye nezakhiwo zikagesi zezingxenye.Njengoba indawo ye-brazing yokuxhumana inqunyelwe, ukuchichima kwe-solder akuvunyelwe, futhi imingcele yenqubo yokubopha kufanele ilawulwe ngokuqinile.
Izindlela eziningi zokushisisa zingase zisetshenziselwe ukubrasa izinsimbi eziyigugu kanye nezinto ezithinta insimbi eyigugu.Ukubasa amalangabi kuvame ukusetshenziselwa izingxenye ezinkulu zokuxhumana;I-induction brazing ilungele ukukhiqizwa ngobuningi.I-Resistance brazing ingenziwa ngomshini wokushisela owejwayelekile wokumelana, kodwa kufanele kukhethwe isikhathi esincane samanje neside sokubhinca.I-Carbon block ingasetshenziswa njenge-electrode.Uma kudingekile ukugcoba inombolo enkulu yezingxenye zokuxhumana ngesikhathi esisodwa noma ukuqinisa othintana nabo abaningi engxenyeni eyodwa, ukufakwa kwesithando somlilo kungasetshenziswa.Lapho izinsimbi ezihlonishwayo zenziwa izindlela ezivamile emkhathini, ikhwalithi yamalunga impofu, kuyilapho i-vacuum brazing ingathola amalunga ekhwalithi ephezulu, futhi izakhiwo zezinto ngokwazo ngeke zithinteke.
(2) Igolide elikhangisayo kanye nengxubevange yalo kukhethwa njengezinsimbi zokugcwalisa.Izinsimbi zokugcwalisa ezisekelwe esiliva nezisekelwe ethusi zisetshenziselwa ikakhulukazi othintana naye, ezingagcini nje ngokuqinisekisa ukuqhutshwa kokuhlangana kwe-brazing, kodwa futhi kulula ukumanzisa.Uma izidingo ze-conductivity ezihlangene zingahlangatshezwana nazo, insimbi yokugcwalisa i-brazing equkethe i-Ni, PD, Pt nezinye izakhi ingasetshenziswa, futhi insimbi yokugcwalisa i-brazing ene-brazing nickel, i-diamond alloy kanye nokumelana okuhle kwe-oxidation nakho kungasetshenziswa.Uma i-Ag Cu Ti brazing filler metal ikhethiwe, izinga lokushisa lokubhoboza akufanele libe ngaphezu kuka-1000 ℃.
I-oxide eyisiliva eyakhiwe endaweni eyisiliva ayizinzile futhi kulula ukuyibhula.I-soldering yesiliva ingasebenzisa i-tin lead filler metal ene-zinc chloride aqueous solution noma i-rosin njenge-flux.Lapho i-brazing, insimbi yokugcwalisa isiliva ivame ukusetshenziswa, futhi i-borax, i-boric acid noma izingxube zayo zisetshenziswa njenge-brazing flux.Lapho i-vacuum brazing isiliva nesiliva ingxubevange oxhumana nabo, isiliva based brazing filler izinsimbi kusetshenziswa ikakhulukazi, ezifana b-ag61culn, b-ag59cu5n, b-ag72cu, njll.
Koxhumana nabo be-brazing palladium, ama-solder asekelwe egolide nasekelwe ku-nickel alula ukwenza izixazululo eziqinile, noma ama-solder asekelwe esiliva, asekelwe ethusi noma asekelwe ku-manganese angasetshenziswa.Isisekelo sesiliva sisetshenziswa kakhulu ekubrazeni iplatinamu nokuxhumana kwe-platinum alloy.I-Copper esekelwe, igolide esekwe noma i-palladium based solder.Ukukhetha i-b-an70pt30 yensimbi yokugcwalisa i-brazing ayikwazi nje ukushintsha umbala we-platinum, kodwa futhi kuthuthukise ngokuphumelelayo izinga lokushisa elincibilikayo lokuhlangana kwe-brazing futhi kwandise amandla nobulukhuni be-brazing joint.Uma othintana naye weplatinamu ezoqiniswa ngqo ku-kovar alloy, i-b-ti49cu49be2 solder ingakhethwa.Kokuthintana neplatinamu ngezinga lokushisa elingeqile ku-400 ℃ endaweni engagqwali, i-solder yethusi engenawo umoya-mpilo ehlanzekile enezindleko eziphansi kanye nokusebenza kahle kwenqubo kuyokhethwa.
(3) Ngaphambi kokushisa, i-weldment, ikakhulukazi umhlangano wokuxhumana, izobhekwa.Othintana nabo abachotshozwe epuletini elincanyana noma elisikwe emgqeni akufanele bakhubazeke ngenxa yokushaywa nokusikwa.Ubuso obucwebezelayo bokuthintwa okwakhiwa ngokucasula, ukucindezela okuhle nokubunjwa kufanele kuqonde ukuze kuqinisekiswe ukuthintana okuhle nendawo eyisicaba yokusekela.Indawo egobile yengxenye ezoshiselwa noma ingaphezulu lanoma iyiphi irediyasi kufanele ilingane ukuze kuqinisekiswe umphumela ofanele we-capillary ngesikhathi sokubhula.
Ngaphambi kokushisa othintana nabo abahlukahlukene, ifilimu ye-oxide ebusweni be-weldment izosuswa ngezindlela zamakhemikhali noma zemishini, futhi ingaphezulu le-weldment lizohlanzwa ngokucophelela ngophethiloli noma utshwala ukuze kukhishwe amafutha, amafutha, uthuli nokungcola okuvimbela ukumanzisa. nokugeleza.
Ukuze uthole ama-welds amancane, i-adhesive izosetshenziselwa ukubeka ngaphambili ukuze kuqinisekiswe ukuthi ngeke ishintshe ngesikhathi sokuphatha ukushaja kwesithando somlilo kanye nokushaja kwensimbi yokugcwalisa, futhi i-adhesive esetshenzisiwe ngeke ibangele ukulimala.Ukuze uthole ukushisela okukhulu noma ukuthintana okukhethekile, ukuhlanganisa kanye nokubeka endaweni kufanele kube nge-fixture nomphathi noma i-groove ukwenza i-weldment ibe yisimo esizinzile.
Ngenxa ye-conductivity enhle yokushisa yezinto eziyigugu zensimbi, izinga lokushisa kufanele linqunywe ngokusho kohlobo lwezinto ezibonakalayo.Ngesikhathi sokupholisa, izinga kufanele lilawulwe kahle ukuze wenze umfaniswano wokucindezeleka ohlangene we-brazing;Indlela yokushisisa izovumela izingxenye ezishiselwe ukuthi zifinyelele izinga lokushisa lokubhula ngesikhathi esifanayo.Othintana nabo bensimbi encane eyigugu, ukushisa okuqondile kufanele kugwenywe futhi ezinye izingxenye zingasetshenziselwa ukushisa okwenziwayo.Ingcindezi ethile izosetshenziswa kothintana naye ukuze kulungiswe othintana naye lapho i-solder incibilika futhi igeleza.Ukuze kugcinwe ukuqina kosekelo lokuxhumana noma ukwesekwa, ukukhishwa kuzogwenywa.Ukushisa kungakhawulwa endaweni engaphezulu yokubhula, njengokulungisa indawo ngesikhathi sokubhula kwelangabi, i-induction brazing noma i-brazing brazing.Ukwengeza, ukuze kuvinjwe i-solder ekuqedeni izinsimbi eziyigugu, izinyathelo ezinjengokulawula inani le-solder, ukugwema ukushisa ngokweqile, ukukhawulela isikhathi sokushisa ekushiseni okushisayo, nokwenza ukushisa kusatshalaliswe ngokulinganayo kungathathwa.
Isikhathi sokuthumela: Jun-13-2022