Peb yog EMS ua tus xa khoom，muab cov kev pabcuam tag nrho ntawm cov ntawv luam tawm Circuit board board (PCBA), cov cuab yeej sib dhos, lub thawv tsim thiab kuaj rau ntau qhov chaw ua haujlwm thiab kev lag luam rau 17 xyoo.
BQC tau mob siab los muab EMS daws teeb meem los ntawm cov khoom lag luam tsim kom paub tab ntau lawm. Los ntawm peb tus nqi qis thaum kev ntseeg tau zoo ntawm EMS cov kev pabcuam, peb ua kom peb cov qhua muaj peev xwm sib tw hauv kev ua lag luam.
Yuav ua li cas txhim kho txoj kev soldering ntawm PCBA board?
Nyob rau hauv cov txheej txheem ntawm PCBA ua tiav, muaj ntau cov txheej txheem ntau lawm thiab ntau yam teeb meem zoo tau tshwm sim. Lub sijhawm no, nws yog qhov yuav tsum tau txhim kho PCBA vuam txoj kev txuas ntxiv thiab txhim kho cov txheej txheem los txhim kho cov khoom lag luam kom zoo.
1. Txhim kho vuam kub thiab sijhawm
Lub intermetallic daim ntawv cog lus nruab nrab ntawm tooj liab thiab tin ua qauv siv lead ua nplej. Cov duab thiab qhov loj me ntawm cov kua siv lead ua siv nyob ntawm qhov ntev thiab lub zog ntawm qhov kub thaum vuam. Tsawg dua thaum tshav kub vuam tuaj yeem tsim cov qauv zoo crystalline, ua rau lub vuam txuas nrog qhov ua tau zoo tshaj plaws. PCBA thaj ua rau cov tshuaj tiv thaiv lub sijhawm ntev dhau, txawm tias vim lub sijhawm vuam ntev dhau los lossis vim qhov kub lossis ob qho tib si, nws yuav ua rau cov qauv crystalline ntxhib, uas yog gritty thiab nkig, thiab muaj lub zog shear siab. me me.
2. Txo qhov nro ntawm lub ntsej muag
Qhov sib xyaw ntawm tin-lead solder tseem ntau dua li cov dej, yog li cov nqaj dej yuav txo qis nws thaj chaw (hauv qab tib lub ntim, tus kheej muaj qhov thaj chaw me tshaj piv nrog lwm cov duab geometric kom tau raws li qhov xav tau ntawm cov qis tshaj zog lub xeev). Qhov cuam tshuam ntawm qhov cuam tshuam zoo ib yam li cov nyhuv ntawm qhov huv huv ntawm daim nplaim roj. Tsis tas li, qhov nro ntawm cov npoo kuj tseem cuam tshuam rau qhov huv thiab kub ntawm lub npoo. Tsuas yog thaum lub nplaum hluav taws xob muaj zog ntau dua li lub zog saum npoo av (cohesion) tuaj yeem zoo tagnrho adhesion tshwm sim. tin.
Peb, PCBA pawg thawj coj saib cov ces kaum
Thaum eutectic point kub ntawm ham yog kwv yees li 35 ° C siab dua, thaum poob kua muag tshuaj tso rau qhov kub flux-txheej saum npoo, ib qho meniscus tau tsim. Txhawm rau qee yam, muaj peev xwm ntawm cov hlau saum npoo los ntog tin Nws tuaj yeem raug ntsuas los ntawm cov duab ntawm cov meniscus. Yog hais tias cov cam meniscus muaj qhov pom tseeb hauv qab ntug, zoo li tus nqos dej ntawm lub tais hlau, lossis txawm tias zoo li kheej kheej, lub hlau tsis xeb. Tsuas yog cov meniscus ncav mus rau qhov loj me tsawg dua 30. Nws muaj qhov weldability zoo ntawm lub kaum sab xis me me.
Cim npe nrov: oem maub los pcba ntawm lub moos ntse, Tuam Tshoj, tuam ntxhab, lub Hoobkas, Mekas
