Reflow flow welding inoreva nzira yewelding iyo inoona mechanic uye magetsi ekubatanidza pakati pesolder migumo kana mapini epamusoro pesevhisi zvikamu uye PCB solder pads nekunyungudutsa solder paste pre-yakadhindwa paPCB solder pads.
1. Kuyerera kwemaitiro
Maitiro ekuyerera kwe reflow soldering: kudhinda solder paste → mounter → reflow solder.
2. Maitiro maitiro
Saizi yejoint solder inodzoreka.Saizi yaidiwa kana chimiro chejoint solder inogona kuwanikwa kubva muhukuru dhizaini yepadhi uye huwandu hwepaste hwakadhindwa.
Welding paste inowanzo shandiswa nesimbi screen kudhinda.Kuti kurerutsa kuyerera kwemaitiro uye kuderedza mutengo wekugadzira, kazhinji paste imwe chete yewelding inodhindwa kune yega yega welding.Ichi chimiro chinoda kuti zvikamu zvemusangano wega wega zvikwanise kugovera solder paste uchishandisa mesh imwechete (kusanganisira mesh yehukobvu hwakafanana uye mesh yakatsikwa).
Iyo reflow choto ichokwadi yakawanda-tembiricha tembiricha yevira ine basa guru kupisa PCBA.Zvikamu zvakarongwa pamusoro pepasi (kudivi B) zvinofanirwa kusangana neyakagadziriswa mechanical zvinodiwa, zvakadai seBGA package, component mass uye pini contact area ratio ≤0.05mg/mm2, kuitira kudzivirira zvikamu zvepamusoro kuti zvisadonha kana welding.
Mu reflow soldering, chikamu chacho chiri kutenderera zvachose pane yakanyungudutswa solder (solder joint).Kana saizi yepedhi iri hombe kupfuura saizi yepini, dhizaini inorema, uye dhizaini yepini idiki, inotadzika kusimuka nekuda kweasymmetric yakanyungudutswa solder pamusoro tension kana kumanikidzwa convective inopisa mhepo ichivhuvhuta muchoto chekuyerera.
Kazhinji kutaura, kune zvikamu zvinogona kugadzirisa nzvimbo yazvo pachazvo, iyo yakakura chiyero chehukuru hwepadhi kusvika kune inopindirana nzvimbo yewelding end kana pini, iyo yakasimba yekumisikidza basa rezvikamu.Ndiyo iyi poindi yatinoshandisa kune chaiyo dhizaini yemapadhi ane zvinodiwa zvekuisa.
Kuumbwa kwe weld (spot) morphology inonyanya kuenderana nekuita kwekunyorova kugona uye tension yepasi ye solder yakanyungudutswa, senge 0.44mmqfp.Iyo yakadhindwa solder paste pateni inogara cuboid.
Nguva yekutumira: Zvita-30-2020