Zofunikira zikhalidwekugulitsa PCBmatabwa ozungulira

1.The weldment ayenera kukhala weldability wabwino

Zomwe zimatchedwa solderability zimatanthawuza kugwira ntchito kwa aloyi kuti zinthu zachitsulo zikhale zowotcherera ndi solder zimatha kupanga kuphatikiza bwino pa kutentha koyenera. Sizitsulo zonse zomwe zimakhala ndi weldability wabwino. Zitsulo zina, monga chromium, molybdenum, tungsten, ndi zina zotero, zimakhala ndi weldability wochepa kwambiri; zitsulo zina, monga mkuwa, mkuwa, ndi zina zotero, zimakhala ndi weldability bwino. Pa kuwotcherera, kutentha kwambiri kumapangitsa kuti filimu ya okusayidi ipangidwe pamwamba pazitsulo, zomwe zimakhudza kutsekemera kwa zinthuzo. Pofuna kukonza solderability, pamwamba malata plating, plating siliva ndi miyeso ina angagwiritsidwe ntchito kupewa makutidwe ndi okosijeni wa zinthu pamwamba.

2.Pamwamba pa weldment ayenera kukhala woyera

Kuti mukwaniritse kuphatikiza kwabwino kwa solder ndi kuwotcherera, malo owotcherera ayenera kukhala oyera. Ngakhale zowotcherera zomwe zimakhala ndi weldability wabwino, mafilimu a oxide ndi madontho amafuta omwe amawononga kunyowetsa amatha kupangidwa pamwamba pa kuwotcherera chifukwa chosungira kapena kuipitsidwa. Filimu yadothi iyenera kuchotsedwa musanawotchere, apo ayi mawonekedwe awotcherera sangathe kutsimikiziridwa. Zigawo zofatsa za oxide pazitsulo zitha kuchotsedwa ndi flux. Malo achitsulo omwe ali ndi okosijeni kwambiri ayenera kuchotsedwa ndi makina kapena njira za mankhwala, monga kukwapula kapena pickling.

3.Gwiritsani ntchito kusinthasintha koyenera

Ntchito ya flux ndikuchotsa filimu ya oxide pamwamba pa kuwotcherera. Njira zosiyanasiyana zowotcherera zimafunikira ma fluxes osiyanasiyana, monga nickel-chromium alloy, chitsulo chosapanga dzimbiri, aluminiyamu ndi zida zina. Ndizovuta kugulitsa popanda kusinthasintha kwapadera kwapadera. Mukawotcherera mwatsatanetsatane zinthu zamagetsi monga matabwa osindikizidwa, kuti kuwotchererako kukhala kodalirika komanso kokhazikika, flux yochokera ku rosin imagwiritsidwa ntchito. Nthawi zambiri, mowa umagwiritsidwa ntchito kusungunula rosin m'madzi a rosin.

4. Kuwotcherera kuyenera kutenthedwa mpaka kutentha koyenera

Pa kuwotcherera, ntchito ya mphamvu matenthedwe ndi kusungunula solder ndi kutentha kuwotcherera chinthu, kotero kuti malata ndi maatomu otsogolera kupeza mphamvu zokwanira kulowa mu kristalo lattice pamwamba zitsulo kuti welded kupanga aloyi. Ngati kutentha kwa kuwotcherera kuli kochepa kwambiri, kudzakhala kowononga kulowa kwa ma atomu a solder, zomwe zimapangitsa kuti zikhale zosatheka kupanga alloy, ndipo zimakhala zosavuta kupanga solder yonyenga. Ngati kuwotcherera kutentha kwambiri, solder adzakhala mu dziko sanali eutectic, kufulumizitsa kuwonongeka ndi volatilization mlingo wa flux, kuchititsa khalidwe la solder kuwonongeka, ndipo zikavuta kwambiri, Zingayambitse ziyangoyango pa kusindikizidwa. bolodi lozungulira kuti ligwe. Chomwe chiyenera kutsindika ndikuti osati solder iyenera kutenthedwa kuti isungunuke, koma kuwotcherera kuyeneranso kutenthedwa ndi kutentha komwe kungathe kusungunula solder.

5. Yoyenera kuwotcherera nthawi

Nthawi yowotcherera imatanthawuza nthawi yofunikira pakusintha kwakuthupi ndi kwamankhwala panthawi yonse yowotcherera. Zimaphatikizapo nthawi yopangira zitsulo kuti zifike kutentha kwazitsulo, nthawi yosungunuka, nthawi yoti zitsulo zigwire ntchito komanso nthawi yopangira zitsulo. Pambuyo pa kutentha kwa kuwotcherera kwatsimikiziridwa, nthawi yoyenera kuwotcherera iyenera kutsimikiziridwa malinga ndi mawonekedwe, chikhalidwe, ndi makhalidwe a zigawo zomwe ziyenera kuwotcherera. Ngati nthawi yowotcherera ndi yayitali kwambiri, zigawozo kapena zowotcherera zidzawonongeka mosavuta; ngati nthawi yowotcherera ili yochepa kwambiri, zofunikira zowotcherera sizidzakwaniritsidwa. Nthawi zambiri, nthawi yokwanira yolumikizira mgwirizano uliwonse wa solder sipitilira masekondi asanu.