Kodi mawonekedwe a reflow welding process ndi chiyani?

Reflow flow welding amatanthauza njira yowotcherera yomwe imazindikira kulumikizana kwamakina ndi magetsi pakati pa ma solder malekezero kapena mapini a zida zapamtunda ndi ma PCB solder pads posungunula phala la solder losindikizidwa kale pa PCB solder pads.
1. Njira yoyenda
Mayendedwe a reflow soldering: kusindikiza solder phala → chokwera → reflow soldering.

2. Makhalidwe a ndondomeko
Kukula kolumikizana kwa solder ndikosavuta.Kukula komwe kumafunidwa kapena mawonekedwe a ophatikizana a solder atha kupezeka kuchokera pamapangidwe amtundu wa pad ndi kuchuluka kwa phala losindikizidwa.
Paste wowotcherera nthawi zambiri amagwiritsidwa ntchito ndi makina osindikizira achitsulo.Pofuna kupeputsa ndondomeko otaya ndi kuchepetsa mtengo kupanga, kawirikawiri phala limodzi kuwotcherera amasindikizidwa aliyense padziko kuwotcherera.Izi zimafuna kuti zigawo zapamsonkhano uliwonse zizitha kugawa phala la solder pogwiritsa ntchito mauna amodzi (kuphatikiza mauna a makulidwe omwewo ndi mauna opondapo).

The reflow ng'anjo kwenikweni ndi Mipikisano kutentha ngalande ng'anjo amene ntchito yake yaikulu ndi kutentha PCBA.Zigawo zomwe zakonzedwa pansi (mbali B) ziyenera kukwaniritsa zofunikira zamakina, monga phukusi la BGA, chigawo cha chigawo ndi pini kukhudzana ndi malo ≤0.05mg/mm2, pofuna kuteteza kuti zigawo za pamwamba zisagwe pamene kuwotcherera.

Mu reflow soldering, chigawocho chikuyandama pa solder yosungunuka (solder joint).Ngati padiyo ndi yayikulu kuposa kukula kwa pini, mawonekedwe ake ndi olemera, ndipo mawonekedwe a piniwo ndi ocheperako, amatha kusuntha chifukwa cha kupsinjika kwa asymmetric molt solder pamwamba kapena kukakamizika kwa mpweya wotentha womwe ukuwomba mung'anjo ya reflow.

Nthawi zambiri, pazigawo zomwe zimatha kukonza malo awo pawokha, kuchuluka kwa kukula kwa pad ndi malo ophatikizika a kumapeto kwa kuwotcherera kapena pini, kumapangitsanso magwiridwe antchito a zigawozo.Ndi mfundo iyi yomwe timagwiritsa ntchito pamapangidwe enieni a mapepala okhala ndi zofunikira zoyika.

Mapangidwe a weld (malo) morphology makamaka zimadalira zochita za kunyowetsa mphamvu ndi kukangana pamwamba wa solder wosungunuka, monga 0.44mmqfp.Mtundu wosindikizidwa wa solder phala ndi wokhazikika wa cuboid.