Ndi kuphatikiza kwa IC kumtunda ndi kumtunda, mapazi a IC akuchulukirachulukira.Pamene ofukula malata kupopera mbewu mankhwalawa ndi kovuta kuwombetsa chabwino kuwotcherera PAd lathyathyathya, zomwe zimabweretsa zovuta SMT mounting;Komanso, alumali moyo wa malata kupopera mbale ndi lalifupi kwambiri.Komabe, mbale yagolide imathetsa mavuto awa:
1.) Pakuti pamwamba phiri luso, makamaka kwa 0603 ndi 0402 kopitilira muyeso-yaing'ono tebulo phiri, chifukwa flatness wa kuwotcherera PAD mwachindunji zogwirizana ndi khalidwe la solder phala ndondomeko yosindikiza, kumbuyo kwa kukonzanso otaya kuwotcherera khalidwe ali kukhudza kwambiri, kotero, mbale yonse yoyika golide mu kachulukidwe kwambiri komanso ukadaulo wokwera kwambiri wapa tebulo nthawi zambiri umawoneka.
2.) Mu gawo chitukuko, chikoka cha zinthu monga zigawo zogula zambiri si bolodi kuti kuwotcherera yomweyo, koma nthawi zambiri kudikira masabata angapo kapena miyezi isanagwiritse ntchito, alumali moyo wa golide yokutidwa bolodi ndi yaitali kuposa terne. zitsulo nthawi zambiri, kotero aliyense ali wokonzeka kutengera.Kupatula apo, PCB yokutidwa ndi golide mumadigiri amtengo wagawo lachitsanzo poyerekeza ndi mbale za pewter
3.)
4.) Koma ndi mawaya ochulukirachulukira, makulidwe a mzere, masitayilo afika 3-4MIL
Chifukwa chake, zimabweretsa vuto lalifupi la waya wagolide: ndi kuchuluka kwa ma frequency a siginecha, kukopa kwa ma siginecha mu zokutira zingapo chifukwa champhamvu ya khungu kumawonekera kwambiri.
(Skin effect : High frequency alternating current, panopa imakonda kuyang'ana pamwamba pa waya. Malinga ndi kuwerengera, kuya kwa khungu kumayenderana ndi ma frequency.)
Pa PCB kusindikiza, kaya pali mafuta permeating filimu pamwamba pa PAN, akhoza kuletsa zotsatira za malata;izi zikhoza kutsimikiziridwa ndi solder float test
Kaya malo okongoletsedwa a PAN angakwaniritse zofunikira za mapangidwe, ndiye kuti, ngati chowotcherera chingapangidwe kuti chitsimikizidwe kuthandizira zigawozo.
Chowotcherera chowotcherera sichidaipitsidwa, chomwe chingayesedwe ndi kuipitsidwa kwa ion;t
Za pamwamba:
Golide plating, kungapangitse PCB yosungirako nthawi yaitali, ndi kunja chilengedwe kutentha ndi chinyezi kusintha ndi yaing'ono (poyerekeza ndi mankhwala ena pamwamba), zambiri, akhoza kusungidwa kwa pafupifupi chaka;HASL kapena kutsogolera kwaulere HASL pamwamba mankhwala chachiwiri, OSP kachiwiri, awiri pamwamba mankhwala mu chilengedwe kutentha ndi chinyezi yosungirako nthawi kulabadira zambiri za
Nthawi zonse, chithandizo cha siliva padziko lapansi ndi chosiyana pang'ono, mtengo wake ndi wokwera kwambiri, kusungirako kumakhala kovuta kwambiri, kufunikira kosagwiritsa ntchito ma CD a sulfure!Ndipo sungani kwa miyezi itatu!Pamphamvu ya malata, golidi, OSP, kutsitsi kwa malata kumakhala kofanana, opanga amayenera kuganizira za mtengo wake!