Kev ntsuam xyuas tsis zoo ntawm yoj soldering (2)

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Kev ntsuam xyuas tsis zoo ntawm yoj soldering (2)

Hluav taws xob to

(tsis zoo rwb thaiv tsev)

1. Flox tsim ion residue ntawm lub rooj tsavxwm; los yog Flox nqus dej thiab ua dej thiab hluav taws xob.

2. PCB tsim yog tsis tsim nyog, xaim ze dhau, thiab lwm yam.

3. PCB solder mask muaj qhov tsis zoo thiab yooj yim rau kev siv hluav taws xob.

Cov welding

1. Tsis txaus ua haujlwm flux.

2. Lub wettability ntawm flux tsis txaus.

3. Cov txheej txheej flux tsawg dhau.

4. Tsis sib xws txheej ntawm flux.

5. PCB cheeb tsam tsis tuaj yeem coated nrog flux.

⒍ thaj chaw PCB tsis yog xim av.

(5) qee cov ntaub qhwv los yog vuam taw yog oxidized tiag tiag.

8. Kev xaim PCB tsis tsim nyog (kev faib khoom ntawm cov khoom tsis tsim nyog).

⒐ Cov kev taw qhia ntawm lub phaj txav tsis raug, thiab preheating ntawm tin tsis txaus.

⒑ cov ntsiab lus tin tsis txaus, lossis cov tooj liab tshaj tus qauv; [qhov impurity tshaj tus qauv, ua rau lub melting point (liquidus) ntawm tin kua nce]

⒒ Cov yeeb nkab ua npuas dej raug thaiv thiab ua npuas dej tsis sib xws, ua rau tsis sib xws ntawm Flox ntawm PCB.

⒓ qhov teeb tsa ntawm rab riam cua tsis tsim nyog (flux tsis sib npaug).

Qhov ceev thiab preheating ntawm lub phaj tsis zoo sib xws.

14. Kev ua haujlwm tsis raug thaum lub sij hawm tin dipping.

Lub inclination lub kaum sab xis ntawm cov saw yog tsis tsim nyog.

Lub crest ntawm nthwv dej tsis sib xws.

Ci dhau los tsis yog

1. Qhov teeb meem ntawm flux: A. Nws tuaj yeem hloov tau los ntawm kev hloov cov khoom siv ntxiv (kev xaiv ntawm flux);

B. flux micro corrosion.

2. Cov tin tsis zoo (piv txwv li, cov ntsiab lus tin tsawg dhau).

luv luv

1. luv Circuit Court tshwm sim los ntawm tin kua:

A. nruam vuam tshwm sim tab sis tsis pom.

B. cov kua tin tsis ncav cuag qhov kub thiab txias ua haujlwm, thiab muaj "tin hlau" txuas ntawm cov pob qij txha.

C. Muaj cov hlaws me me ntawm cov pob qij txha.

D. yog tias txuas txuas txuas ntxiv, tus choj yuav raug tsim.

2. Cov teeb meem ntawm flux:

A. flux muaj kev ua haujlwm tsawg thiab tsis muaj dej tsis zoo, ua rau tin bonding ntawm cov pob qij txha.

B. qhov impedance ntawm flux tsis txaus, ua rau luv luv ntawm cov pob qij txha.

3. Cov teeb meem ntawm PCB: piv txwv li, luv luv Circuit Court tshwm sim los ntawm kev poob ntawm lub npog ntsej muag ntawm PCB nws tus kheej

Cov pa luam yeeb loj, saj loj

1. Teeb meem ntawm flux nws tus kheej

A. resin: yog siv cov resin zoo tib yam, cov pa luam yeeb loj heev

B. hnyav: qhov tsis hnov ​​tsw los yog pungent tsw ntawm cov kuab tshuaj siv nyob rau hauv flux tej zaum yuav loj

C. activator: pa taws loj thiab tsw ntxhiab tsw

2. Ua tsis tiav qhov system, txaws thiab cov hlaws dai:

1. Flux

A. Cov ntsiab lus dej hauv flux loj (lossis tshaj tus qauv)

Vuam soldering

Vuam soldering

B. muaj cov ntsiab lus kub kub hauv flux (tsis muaj qhov tsis zoo tom qab preheating)

2. Khoom siv tes ua

A. qis preheating kub (tsis tiav volatilization ntawm flux)

B. ceev ceev ntawm txav phaj tsis ncav cuag cov nyhuv preheating

C. qhov inclination ntawm cov saw tsis zoo, muaj npuas ntawm cov kua tin thiab PCB, thiab cov hlaws tin yog tsim tom qab cov npuas tawg.

D. Cov txheej txheej flux loj heev (tsis muaj riam cua lossis riam cua phem)

E. Kev ua haujlwm tsis raug thaum lub sij hawm tin dipping

F. ntub chaw ua haujlwm

3. PCB teeb meem

A. Lub rooj tsavxwm nto yog ntub, tsis muaj preheated, los yog ya raws yog generated

B. qhov tsim ntawm PCB roj to yog tsis tsim nyog, ua rau huab cua thaiv ntawm PCB thiab tin kua

C. PCB tsim yog tsis tsim nyog, thiab ib feem ntawm ko taw yog tuab heev, ua rau cavitation

D. PCB los ntawm qhov tsis zoo