PCB is an indispensable part of modern electronics and the carrier of electrical connection of electronic components. Nekuenderera mberi kwekuvandudza tekinoroji yemagetsi, kuwanda kwePCB kuri kuwedzera nekukwira, saka kune zvakawanda uye zvakawanda zvinodiwa zvewelding process. Naizvozvo, zvinodikanwa kuongorora uye kutonga izvo zvinokanganisa PCB welding mhando uye kuona zvikonzero zvekuremara kwewelding, kuitira kuti uvandudze kwakanangwa uye uvandudze huwandu hwese hwePCB board. Let’s take a look at the causes of welding defects on Pcb bhodhi.

Why do PCB boards have welding defects

1. The weldability yedunhu bhodhi gomba kunokanganisa welding quality

Yuankun “core” with the world for 20 years true “core” sincere service, the choice of 500,000 customers

Iyo gomba weldability yedunhu bhodhi haina kunaka, ichaburitsa hurema hwakakwana, hunokanganisa maparameter ezvikamu mudunhu, zvinotungamira mukusagadzikana kweiyo multilayer bhodhi zvikamu uye yemukati mutsara conduction, kukonzeresa kutadza kwebasa redunhu rose.

Izvo zvakakosha zvinhu zvinokonzeresa kutapisa kwemapepa akadhindwa edunhu ndeaya:

(1) kuumbwa kweiyo solder uye chimiro cheiyo solder. Solder chikamu chakakosha chekugadzira kemikari kurapwa maitiro, inoumbwa nemakemikari zvinhu zvine flux, inowanzoshandiswa yakaderera kunyungudika eutectic simbi ndeye Sn-Pb kana Sn-Pb-Ag. Izvo zviri mukati metsvina zvinofanirwa kudzorwa kudzivirira iyo oxide inogadzirwa netsvina kubva pakunyungudutswa nekuyerera. Basa rekuyerera nderokubatsira iyo inonamira kunyorovesa padunhu replate yakagadziriswa nekutamisa kupisa uye kubvisa ngura. White rosin uye isopropyl doro rinowanzoshandiswa.

(2) Welding tembiricha uye simbi ndiro pamusoro pehutsanana inokanganisawo weldability. Tembiricha yakanyanyisa, iyo solder diffusion kumhanya inomhanyisa, panguva ino ine basa rakakwirira kwazvo, ichaita kuti redunhu bhodhi uye solder zvinyunguduke pamusoro nekukurumidza oxidation, welding defects, redunhu bhodhi pamusoro kusvibiswa kuchakanganisawo weldability kuburitsa kuremara, kusanganisira mabheji emarata, mabhora emarata, dunhu rakavhurika, gloss hazvina kunaka.

2. Welding defects zvinokonzerwa ne warping

Mabhodhi edunhu uye zvikamu zvakamonyoroka panguva yewelding, zvichikonzera kukanganisa kwakadai senge welding uye pfupi pfupi nekuda kwekunetseka kwekunetseka. Kukundwa kunowanzo kukonzerwa nekusaenzana kwetembiricha pakati pezvikamu zvepamusoro nezvepasi zvebhodhi redunhu. Kune yakakura PCBS, kurwa kunoitikawo kana bhodhi rikawira pasi pehuremu hwayo. Zvakajairika PBGA zvishandiso zvinenge 0.5mm kure kubva kudhindwa redunhu bhodhi. Kana zvikamu pabhodhi redunhu zvakakura, mubatanidzwa we solder uchange uri pasi pekunetseka kwenguva yakareba sezvo bhodhi redunhu rinodzokera kune chimiro chayo mushure mekutonhora. Kana chinhu ichocho chikakwidziridzwa ne0.1mm, zvichave zvakakwana kukonzera iyo chaiyo yekutenderera yakavhurika redunhu.

3, dhizaini yebhodhi redunhu inokanganisa iwo mhando yekutenderera

Muchigadziro, saizi yebhodhi redunhu yakakura kwazvo, kunyangwe iyo welding iri nyore kudzora, asi mutsara wekudhinda wakareba, iyo impedance inowedzera, iyo anti-ruzha kugona inoderera, mutengo unowedzera; Kunyanya kudiki, kupisa kwekupisa kunodzikira, welding haisi nyore kudzora, nyore kuoneka mitsetse yakatarisana inopindirana, senge electromagnetic kupindira kwedunhu redunhu. Naizvozvo, PCB bhodhi dhizaini inofanirwa kuvandudzwa:

(1) Pfupisa kuwirirana pakati pe-high-frequency components uye kuderedza kupindira kweEMI.

(2) Zvikamu zvine huremu hukuru (zvakadai kupfuura 20g) zvinofanirwa kugadziriswa nerutsigiro uye zvobva zvasungwa.

(3) Kupisa kwekupisa kwezvinhu zvekupisa kunofanirwa kutariswa kudzivirira hombe δ T pamusoro pekukanganisika uye kushandazve, uye zvinhu zvinodziya kupisa zvinofanirwa kuchengetedzwa kure nezvinopisa.

. 4∶3 rectangular redunhu bhodhi dhizaini yakanakisa. Usashandura hupamhi hwewaya kudzivirira discontinuities mu wiring. Apo bhodhi redunhu rinopisa kwenguva yakareba, foil yemhangura iri nyore kuwedzera uye kudonha. Nokudaro, foil yakakura yemhangura inofanira kudziviswa.

Mukupfupisa, kuitira kuverengera huwandu hwese hwePCBboard, zvinodikanwa kuti ushandise zvakanakisa solder, kuvandudza kutengesa kwebhodhi rePCB, uye kudzivirira kurwisa kudzivirira hurema mukugadzirwa kwemaitiro.