I-Reflow flow welding ibhekisela kwinqubo yokushisela eqaphela ukuxhumana kwemishini nokukagesi phakathi kweziphetho ze-solder noma izikhonkwane zezingxenye zokuhlanganisa ezingaphezulu kanye namaphedi e-PCB e-solder ngokuncibilikisa unamathisele we-solder ophrintwe ngaphambili kumaphedi okuthengisa we-PCB.
1. Ukugeleza kwenqubo
Inqubo yokugeleza kwe-reflow soldering: ukunamathisela i-solder yokuphrinta → isikhwezi → i-reflow soldering.
2. Izici zenqubo
Usayizi ohlangene we-solder uyalawuleka.Usayizi oyifunayo noma umumo wejoyinti le-solder ungatholakala ekwakhiweni kosayizi wephedi kanye nenani lokunamathisela eliphrintiwe.
I-Welding paste ngokuvamile isetshenziswa ngokuphrinta isikrini sensimbi.Ukuze kube lula ukugeleza kwenqubo futhi kuncishiswe izindleko zokukhiqiza, imvamisa ukunamathisela okushisela okukodwa kuphrintiwe endaweni ngayinye yokushisela.Lesi sici sidinga ukuthi izingxenye ezisebusweni bomhlangano ngamunye zikwazi ukusabalalisa ukunamathisela kwe-solder kusetshenziswa i-mesh eyodwa (okuhlanganisa i-mesh yogqinsi olufanayo kanye ne-mesh enezinyathelo).
Isithando somlilo sokugeleza kabusha empeleni siwumlilo wokushisa wokushisa omningi omsebenzi wawo oyinhloko uwukushisa i-PCBA.Izingxenye ezihlelwe endaweni engaphansi (uhlangothi B) kufanele zihlangabezane nezidingo zemishini engaguquki, njengephakheji ye-BGA, isisindo sengxenye nendawo yokuxhumana yephinikhodi ≤0.05mg/mm2, ukuze kuvinjelwe izingxenye ezingaphezulu ukuthi zingawi lapho zishiswa.
Ku-reflow soldering, ingxenye intanta ngokuphelele ku-solder encibilikisiwe (i-solder joint).Uma usayizi wephedi mkhulu kunosayizi wephini, isakhiwo sengxenye sisinda kakhulu, futhi isakhiwo sephinikhodi sincane, sijwayele ukususwa ngenxa yengcindezi ye-solder encibilikisiwe ye-asymmetric noma komoya oshisayo ophoqekayo ovunguza esithandweni somlilo.
Ngokuvamile, ezingxenyeni ezikwazi ukulungisa indawo yazo ngokwazo, isilinganiso esikhulu sosayizi wephedi endaweni egqagqene yesiphetho se-welding noma iphini, umsebenzi wokumisa wezingxenye uqina.Yileli phuzu esilisebenzisela ukwakheka okukhethekile kwamaphedi anezidingo zokuma.
Ukwakheka kwe-weld (indawo) morphology ikakhulukazi kuncike esenzweni sekhono lokumanzisa kanye nokushuba kwendawo ye-solder encibilikisiwe, njengo-0.44mmqfp.Iphethini yokunamathisela ye-solder ephrintiwe i-cuboid evamile.
Isikhathi sokuthumela: Dec-30-2020