Ukushisa kwensimbi

1. I-brazing material

(1) I-brazing filler metal cast iron brazing ikakhulukazi isebenzisa i-copper zinc brazing filler metal kanye nensimbi yokugcwalisa ithusi yethusi. Izinhlobo zensimbi ezivame ukusetshenziswa ze-copper zinc brazing filler yi-b-cu62znnimusir, b-cu60zusnr kanye ne-b-cu58znfer. Amandla aqinile we-brazed cast iron joint ngokuvamile afinyelela ku-120 ~ 150MPa. Ngesisekelo se-copper zinc brazing filler metal, i-Mn, i-Ni, i-Sn, i-AI nezinye izakhi zengezwa ukwenza i-brazed joint ibe namandla afanayo nensimbi yesisekelo.

Izinga lokushisa elincibilikayo lensimbi yokugcwalisa i-copper brazing liphansi. Isakhiwo esilimazayo singagwenywa lapho ubhula insimbi. I-brazing joint isebenza kahle, ikakhulukazi i-brazing filler metal equkethe i-Ni, efana ne-b-ag50cuzncdni kanye ne-b-ag40cuznsnni, ethuthukisa amandla okubopha phakathi kwensimbi yokugcwalisa i-brazing ne-cast iron. Ifaneleka ngokukhethekile ukubhula kwe-nodular cast iron, engenza ukuhlangana kube namandla afanayo nesisekelo sensimbi.

(2) Lapho ithusi ne-zinc kusetshenziswa i-brazing cast iron, i-fb301 ne-fb302 isetshenziswa kakhulu, okungukuthi, i-borax noma ingxube ye-borax ne-boric acid. Ngaphezu kwalokho, i-flux eyakhiwe nge-h3bo340%, li2co316%, na2co324%, naf7.4% kanye ne-nac112.6% ingcono.

Lapho kugaywa insimbi ensimbi ngesiliva yethusi yokugcwalisa insimbi, ama-fluxes afana ne-fb101 ne-fb102 angakhethwa, okungukuthi ingxube ye-borax, i-boric acid, i-potassium fluoride ne-potassium fluoroborate.

2. Ubuchwepheshe be-Brazing

Ngaphambi kokusansimbi okusansimbi, i-graphite, i-oxide, isihlabathi, ibala likawoyela nokunye okusesikhundleni sokuphonsa kuzosuswa ngokucophelela. Ukukhuhla kwe-organic solvent kungasetshenziswa ukususa amabala kawoyela, kuyilapho izindlela zemishini ezifana nokuqhunyiswa kwesihlabathi noma ukuqhuma kwesibhamu, noma izindlela ze-electrochemical zingasetshenziswa ukususa igraphite nama-oxide. Ngaphezu kwalokho, i-graphite ingasuswa ngokuyishisa ngelangabi le-oxidizing.

I-Brazing cast iron ingashiswa ngelangabi, isithando somlilo noma ukungeniswa. Njengoba i-SiO2 kulula ukwakha phezu kwe-cast iron, umphumela wokugqama endaweni yokuzivikela awumuhle. Ngokuvamile, i-brazing flux isetshenziselwa ukuqinisa. Lapho ubhula ama-workpieces amakhulu nge-copper zinc brazing filler metal, ungqimba lwe-brazing flux luzofafazwa endaweni ehlanziwe kuqala, bese izinto zokusebenza zizofakwa esithandweni ukuze zishiswe noma zishiswe ngethoshi yokushisela. Uma i-workpiece ishisiswe ibe cishe ku-800 ℃, engeza ukugeleza okungeziwe, ukushisisa ekushiseni okushisayo, bese uklwebha impahla yenaliti emaphethelweni elunga ukuze uncibilikise i-solder futhi uvale igebe. Ukuze kuthuthukiswe amandla elunga le-brazed, ukwelashwa kwe-annealing kuzokwenziwa ku-700 ~ 750 ℃ ​​imizuzu engu-20 ngemva kokubhula, bese ukupholisa kancane kuzokwenziwa.

Ngemuva kokugcoba, ukugeleza ngokweqile kanye nezinsalela kungasuswa ngokugeza ngamanzi afudumele. Uma kunzima ukuyisusa, ingahlanzwa nge-10% sulfuric acid aqueous solution noma 5% ~ 10% phosphoric acid aqueous solution, bese ihlanzwa ngamanzi ahlanzekile.