Kuti ubudirire solder surface Mount components kune redunhu bhodhi, kupisa kunofanira kuendeswa kune solder alloy paste kusvikira tembiricha yaro yasvika pakanyungudutswa (217°C yeSAC305 lead free solder).Iyo yemvura alloy ichasangana nePCB copper pads uye ive eutectic alloy musanganiswa.Iyo yakasimba solder joint inoumbwa mushure mekunge yatonhorera pasi penzvimbo yakanyungudutswa.
Pane nzira nhatu dzekutamisa kupisa kubva pakupisa kuenda kuzvinhu zvinopisa.
- Conduction: Thermal conduction inofambisa zvakananga kuburikidza nechinhu kana paine musiyano wetembiricha pakati penzvimbo dzakabatana, pasina kufamba kwechinhu.Zvinoitika kana zvinhu zviviri zviri patembiricha dzakasiyana zvasangana.Kupisa kunoyerera kubva painodziya kuenda kuchinhu chinotonhorera kusvika zvose zvave patembiricha imwe chete.
- Radiation: Kupisa kupisa kuburikidza nemwaranzi kunoitika muchimiro chemagetsi emagetsi kunyanya munzvimbo ye infrared.Radiation inzira yekufambisa kupisa isingatsamiri pane chero kubatana pakati penzvimbo yekupisa nechinhu chinopisa.Kudzivirirwa kwemwaranzi ndeyekuti muviri mutema unotora kupisa kwakawanda kupfuura chena muviri.
- Convection: Heat convection ndiko kutamisa kupisa kubva kune imwe nzvimbo kuenda kune imwe nekufamba kwemvura yakaita semhepo kana mhute gasi.Iyo zvakare nzira isingabatike yekufambisa kupisa zvakare.
Solder yemazuva anoreflow ovenshandisa pfungwa dzemwaranzi uye convection zvakabatanidzwa.Kupisa kunoburitswa neceramic heat element ine infrared radiation, asi haiendese kuPCB zvakananga.Iko kupisa kunozoenda kune inopisa regulator kutanga kuita kupisa kubuda kunyange.A convection fan inofuridzira mweya unopisa kukamuri yemukati.Iyo inonangwa PCB inogona kuwana kupisa kuenderana mune chero nzvimbo.
Nguva yekutumira: Jul-07-2022