Mapangidwe a SMT pad ndi gawo lofunikira kwambiri PCB kupanga. Zimatsimikizira malo a soldering a zigawo za PCB, kudalirika kwazitsulo za solder, zowonongeka zomwe zingatheke panthawi ya soldering, kumveka bwino, testability ndi maintainability Kudikirira kugwira ntchito yofunika kwambiri. Ngati mapangidwe a PCB pad ndi olondola, pang’ono skew panthawi yokwera imatha kuwongoleredwa chifukwa chodziwongolera pazovuta za solder yosungunuka pa reflow soldering. M’malo mwake, ngati mapangidwe a PCB pad siwolondola, ngakhale malo oyikawo ali olondola kwambiri, padzakhala zolakwika zogulitsira monga kusamuka kwa gawo ndi mwala wapamanda pambuyo pa kugulitsanso. Chifukwa chake, mapangidwe a pad ndi chimodzi mwazinthu zazikulu zomwe zimatsimikizira kupangidwa kwa zida zokwera pamwamba. Mapadi wamba ndi “matenda wamba komanso matenda omwe amapezeka pafupipafupi” mu kapangidwe ka PCB, komanso ndi chimodzi mwazinthu zazikulu zomwe zimayambitsa ngozi zobisika mumtundu wa PCB soldering.

Kodi zotsatira za mapepala wamba pa PCB soldering quality ndi chiyani

1. Pambuyo pazigawo za chip zimagulitsidwa pamtunda womwewo, ngati pini plug-in zigawo kapena mawaya amagulitsidwa kachiwiri, pali ngozi yobisika ya soldering yabodza panthawi yachiwiri.

2. Chiwerengero cha kukonzanso panthawi yotumizidwa, kuyesa ndi kukonzanso pambuyo pa malonda ndizochepa.

3. Pokonza, kutulutsa chigawo chimodzi, zigawo zozungulira za pad zomwezo zonse zimakhala zopanda unsoldered.

4. Pamene pad imagwiritsidwa ntchito mofanana, kupsyinjika kwa pad kumakhala kwakukulu kwambiri, kumapangitsa kuti pad iwonongeke panthawi ya soldering.

5. Pepala lomwelo limagawidwa pakati pa zigawo zikuluzikulu, kuchuluka kwa tini kumakhala kochuluka kwambiri, kugwedezeka kwapamwamba kumakhala kosasunthika pambuyo pa kusungunuka, zigawozo zimakokedwa kumbali imodzi, zomwe zimayambitsa kusamuka kapena miyala yamanda.

6. Mofanana ndi kusagwiritsidwa ntchito moyenera kwa mapepala ena, chifukwa chachikulu ndikuti mawonekedwe a dera okhawo amaganiziridwa ndipo dera kapena malo ndi ochepa, zomwe zimapangitsa kuti pakhale kuyika kwa zigawo zambiri ndi zolakwika za solder mu msonkhano ndi kuwotcherera. , zomwe pamapeto pake zimakhudza kudalirika kwa dera. Kukhudzidwa kwakukulu.