Cov yam ntxwv cuam tshuam rau qhov tsis xws luag hauv pcb

1. Lub solderability ntawm Circuit Court board qhov cuam tshuam rau vuam zoo

Tsis zoo solderability ntawm Circuit Court board qhov yuav ua rau solder tsis xws luag, cuam tshuam rau qhov tsis xws luag ntawm cov khoom nyob rau hauv lub Circuit Court, ua rau unstable conduction ntawm multi-txheej board Cheebtsam thiab cov xov hlau sab hauv, thiab ua rau tag nrho cov Circuit Court tsis ua hauj lwm. Lub npe hu ua weldability yog hais txog cov cuab yeej ntawm cov hlau saum npoo yog wetted los ntawm molten solder, uas txhais tau hais tias lub solder tsim ib tug kuj zoo ib yam thiab nruam du nplaum zaj duab xis ntawm cov hlau nto.

Lub ntsiab yam tseem ceeb uas cuam tshuam rau lub solderability ntawm cov ntawv luam Circuit Court boards yog: (1) muaj pes tsawg leeg ntawm cov solder thiab cov khoom ntawm cov khoom soldered. Solder yog ib qho tseem ceeb hauv cov txheej txheem kev kho tshuaj ntawm vuam, muaj cov khoom siv tshuaj muaj kuab lom. Feem ntau siv cov ntsiab lus melting tsawg eutectic hlau yog Sn-Pb lossis Sn-Pb-Ag. Cov ntsiab lus impurity yuav tsum tau tswj nyob rau hauv ib qho kev faib ua feem los tiv thaiv cov oxide generated los ntawm impurities los ntawm yaj los ntawm cov flux. Lub luag haujlwm ntawm solder yog los pab ntub dej ntawm lub rooj tsav xwm hauv Circuit Court los ntawm kev hloov cov cua sov thiab tshem tawm xeb. Feem ntau, cov rosin dawb thiab isopropanol cov kuab tshuaj yog siv. (2) Vuam kub thiab qhov chaw huv ntawm cov hlau phaj kuj tuaj yeem cuam tshuam rau weldability. Yog hais tias qhov kub thiab txias heev, qhov diffusion ceev ntawm solder yuav ceev. Nyob rau lub sijhawm no, nws muaj kev ua haujlwm siab, uas yuav ua rau oxidation sai ntawm lub rooj tsavxwm Circuit Court thiab solder melting nto, uas ua rau vuam tsis xws luag. Qhov saum npoo ntawm lub rooj tsav xwm Circuit Court kuj tseem yuav kis tau, uas yuav cuam tshuam rau kev ua haujlwm thiab ua rau muaj qhov tsis xws luag, suav nrog cov hlaws hlaws, cov khoom siv, cov khoom qhib, tsis zoo glossiness, thiab lwm yam.

2. Weld tsis xws luag los ntawm warping

Lub rooj tsav xwm hauv Circuit Court thiab cov khoom tsim ua warping thaum lub sijhawm vuam, ua rau muaj qhov tsis xws luag xws li cov pob qij txha thiab lub voj voog luv vim muaj kev ntxhov siab deformation. Warping feem ntau yog tshwm sim los ntawm qhov kub thiab txias ntawm qhov nruab nrab thiab qis ntawm lub rooj tsavxwm. Rau cov PCBs loj, qhov hnyav ntawm lub rooj tsavxwm nws tus kheej kuj yuav ua rau muaj kev sib hloov. Ib qho khoom siv ib txwm yog li ntawm {{0}}.5 hli ntawm lub rooj tsav xwm luam tawm. Yog hais tias lub cuab yeej ntawm lub rooj tsav xwm Circuit Court yog loj, raws li lub Circuit Court board txias thiab rov qab mus rau nws zoo li qub, lub solder sib koom yuav nyob rau hauv kev ntxhov siab rau lub sij hawm ntev. Yog hais tias lub cuab yeej tau tsa los ntawm 0.1 hli, nws yuav txaus los ua kom tsis muaj qhov tsis muaj tseeb qhib Circuit Court.

3. Cov qauv tsim ntawm Circuit Court boards cuam tshuam rau vuam zoo

Nyob rau hauv cov nqe lus ntawm layout, thaum lub Circuit Court board loj dhau lawm, txawm hais tias vuam yog yooj yim los tswj, cov ntawv luam tawm cov kab ntev dua, impedance nce, lub suab nrov kuj txo, thiab tus nqi nce; Thaum lub sij hawm, lub tshav kub dissipation txo, ua rau nws nyuaj rau tswj vuam thiab nquag cuam tshuam ntawm cov kab uas nyob ib sab, xws li electromagnetic cuam tshuam los ntawm Circuit Court boards.

Yog li ntawd, nws yog ib qho tsim nyog los txhim kho PCB pawg thawj coj saib: (1) ua kom luv luv ntawm kev sib txuas ntawm cov khoom siv ntau zaus thiab txo EMI cuam tshuam.

(2) Cov khoom siv nrog qhov hnyav loj (xws li ntau dua 20g) yuav tsum tau kho nrog cov hlua khi thiab tom qab ntawd welded.

(3) Cov khoom siv cua sov yuav tsum xav txog cov teeb meem ntawm cov cua kub dissipation, thiab cov thermal rhiab heev yuav tsum tau ceev kom deb ntawm qhov chaw kub.

(4) Cov txheej txheem ntawm cov khoom yuav tsum ua tib yam li qhov ua tau, uas tsis yog tsuas yog ua kom zoo nkauj xwb tab sis kuj yooj yim rau vuam, ua rau nws tsim nyog rau ntau lawm. Qhov zoo tshaj plaws qauv tsim rau lub rooj tsav xwm Circuit Court yog 4: 3. Tsis txhob ua tam sim ntawd hloov ntawm cov hlau dav kom tsis txhob muaj kev cuam tshuam ntawm kev xaim. Thaum lub Circuit Court board yog rhuab rau ib ntev lub sij hawm, tooj liab foil yog nquag mus nthuav thiab detachment, yog li ntawd, yuav tsum tsis txhob siv cov cheeb tsam loj ntawm tooj liab ntawv ci.