PCB Rework Tips nyob rau hauv kawg ntawm SMT PCBA

PCB Rework

 

Tom qab kev tshuaj xyuas PCBA tiav lawm, PCBA puas yuav tsum tau kho.Lub tuam txhab muaj ob txoj hauv kev los kho lubSMT PCBA.

Ib qho yog siv qhov kub thiab txias tsis tu ncua (kev tuav vuam) rau kev kho, thiab lwm qhov yog siv lub chaw ua haujlwm kho (cov cua kub vuam) los kho.Txawm hais tias txoj kev twg los xij, nws yuav tsum tsim kom muaj kev sib koom ua ke zoo hauv lub sijhawm luv.

Yog li ntawd, thaum siv ib tug soldering hlau, nws yuav tsum tau ua kom tiav lub soldering point nyob rau hauv tsawg tshaj li 3 vib nas this, nyiam dua li 2 vib nas this.

Txoj kab uas hla ntawm cov hlau solder yuav tsum tau ua ntej siv txoj kab uas hla φ0.8mm, lossis siv φ1.0mm, tsis yog φ1.2mm.

Soldering hlau kub qhov chaw: ib txwm vuam hlau mus rau 380 iav, kub kub vuam hlau mus rau 420 iav.

Ferrochrome rework txoj kev yog phau ntawv vuam

1. Kev kho cov hlau soldering tshiab ua ntej siv:

Cov hlau nplaum tshiab tuaj yeem siv tau ib txwm siv tom qab lub taub hau hlau yog plated nrog ib txheej ntawm solder ua ntej siv.Thaum cov hlau soldering siv rau ib lub sij hawm, ib txheej oxide yuav raug tsim nyob rau hauv thiab ib ncig ntawm cov hniav nto ntawm lub taub hau soldering, uas yuav ua rau nyuaj rau "noj mov".Nyob rau lub sijhawm no, txheej txheej oxide tuaj yeem ua ntaub ntawv, thiab cov hlau tuaj yeem rov ua dua.

 

2. Yuav ua li cas tuav cov hlau soldering:

Rov qab tuav: Siv tsib ntiv tes los tuav lub tes tuav ntawm koj lub xib teg.Txoj kev no yog tsim rau high-power hluav taws xob soldering hlau rau weld qhov chaw nrog loj tshav kub dissipation.

Ortho-grip: Tuav tus tuav ntawm cov hlau soldering nrog plaub ntiv tes tshwj tsis yog tus ntiv tes xoo, thiab nias tus ntiv tes xoo raws li kev taw qhia ntawm cov hlau soldering.Cov hlau soldering siv nyob rau hauv txoj kev no kuj tseem loj heev, thiab feem ntau ntawm lawv yog cov lus qhia ntawm cov hlau nplaum.

cwj mem tuav txoj kev: tuav ib tug hluav taws xob soldering hlau, zoo li tuav ib tug cwj mem, yog haum rau cov uas tsis muaj zog hluav taws xob soldering hlau rau welding me me qhov chaw yuav welded.

 

3. Vuam cov kauj ruam:

Thaum lub sij hawm vuam txheej txheem, cov cuab yeej yuav tsum tau muab tso rau kom huv si, thiab cov hluav taws xob soldering hlau yuav tsum ruaj khov kho.Feem ntau, nws yog qhov zoo tshaj plaws los siv cov yeeb nkab zoo li cov hlau uas muaj rosin rau soldering.Tuav cov hlau soldering nyob rau hauv ib tes thiab lub solder hlau nyob rau hauv lwm yam.

Ntxuav lub taub hau taub hau Kub lub qhov taw qhia soldering Melt lub solder Txav cov hlau taub hau Tshem cov hlau soldering

① Ceev nrooj kov cov rhuab thiab tinned soldering hlau taub rau lub cored hlau, ces kov lub solder sib koom cheeb tsam, siv lub molten solder los pab rau thawj lub tshav kub hloov ntawm lub soldering hlau mus rau lub workpiece, thiab ces txav mus rau lub solder hlau mus cuag lub soldering Qhov saum npoo ntawm cov hlau taub hau.

② Sib cuag lub taub hau rau tus pin / ncoo, thiab muab cov hlua khi ntawm lub taub hau thiab tus pin los ua tus choj thermal;tom qab ntawd ceev nrooj txav cov hlau soldering mus rau sab nraud ntawm qhov chaw soldering.

Txawm li cas los xij, feem ntau yog tshwm sim los ntawm qhov kub tsis zoo, siab dhau, ncua sij hawm khaws cia, lossis kev puas tsuaj rau PCB lossis cov khoom siv los ntawm peb ua ke.

 

4. Kev ceev faj rau vuam:

Qhov kub ntawm cov hlau taub hau yuav tsum tsim nyog.Cov lus qhia kub sib txawv ntawm cov hlau nplaum yuav tsim cov xwm txheej sib txawv thaum muab tso rau ntawm rosin thaiv.Feem ntau hais lus, qhov kub thiab txias thaum lub rosin melts sai dua thiab tsis tawm cov pa luam yeeb yog tsim nyog.

Lub sij hawm soldering yuav tsum tsim nyog, los ntawm cua sov lub solder sib koom mus rau lub solder melting thiab sau lub solder sib koom, feem ntau yuav tsum tau ua kom tiav nyob rau hauv ob peb vib nas this.Yog hais tias lub sij hawm soldering ntev dhau lawm, cov flux ntawm cov pob qij txha yuav ua rau tsis muaj zog, thiab cov nyhuv fluxing yuav ploj mus.

Yog hais tias lub sij hawm soldering yog luv luv, qhov kub ntawm qhov taw tes soldering yuav tsis ncav cuag qhov kub ntawm soldering, thiab lub solder yuav tsis yaj txaus, uas yuav yooj yim ua rau cuav soldering.

Tus nqi ntawm solder thiab flux yuav tsum tau siv kom tsim nyog.Feem ntau, kev siv cov solder ntau dhau los yog tsawg dhau thiab flux ntawm qhov sib koom ua ke yuav muaj kev cuam tshuam zoo rau qhov zoo ntawm soldering.

Txhawm rau tiv thaiv cov solder ntawm cov sib koom ua ke los ntawm kev ntws los ntawm qhov tsis sib xws, qhov zoo tshaj plaws soldering yuav tsum yog tias cov solder tsuas yog soldered qhov twg nws yuav tsum tau soldered.Nyob rau hauv lub lag luam soldering, lub solder yuav tsum tsawg dua thaum pib.Thaum lub soldering point ncav cuag lub soldering kub thiab cov solder ntws mus rau hauv qhov sib txawv ntawm soldering point, lub solder yuav tsum refilled kom tiav cov soldering sai sai.

Tsis txhob kov cov pob qij txha thaum lub sij hawm soldering.Thaum lub vuam ntawm cov pob qij txha tsis tau ua tiav, cov khoom siv thiab cov xov hlau ntawm cov pob qij txha yuav tsum tsis txhob txav mus, txwv tsis pub cov pob qij txha yuav raug deformed thiab vuam virtual yuav tshwm sim.

Tsis txhob scald cov khoom nyob ib puag ncig thiab cov xov hlau.Thaum soldering, yuav tsum ceev faj tsis txhob scald cov yas rwb thaiv tsev txheej ntawm ib puag ncig cov xov hlau thiab qhov chaw ntawm lub Cheebtsam, tshwj xeeb tshaj yog rau cov khoom uas compact welding qauv thiab complex duab.

Ua haujlwm tu tom qab vuam hauv lub sijhawm.Tom qab vuam tiav lawm, lub taub hau hlau txiav thiab cov tin slag poob thaum lub vuam yuav tsum tau muab tshem tawm hauv lub sijhawm kom tsis txhob muaj kev puas tsuaj los ntawm kev poob rau hauv cov khoom.

 

5. Kev kho mob tom qab vuam:

Tom qab welding, koj yuav tsum tau xyuas:

Seb puas muaj qhov ploj lawm.

Puas yog qhov gloss ntawm cov pob qij txha zoo?

Lub solder sib koom tsis txaus.

Seb puas muaj cov dej seem nyob ib ncig ntawm cov pob qij txha.

Seb puas muaj kev txuas txuas ntxiv.

Seb lub ncoo tau poob lawm.

Seb puas muaj cov kab nrib pleb hauv cov pob qij txha.

Puas yog qhov sib koom ua ke tsis sib xws?

Seb cov pob qij txha yog ntse.

Rub txhua feem nrog tweezers kom pom tias muaj qhov xoob.

 

6. Kev txiav txim siab:

Thaum lub taub hau hlau yog rhuab los ntawm qhov taw tes desoldering, sai li sai tau thaum lub solder melts, cov hlau lead ntawm cov khoom yuav tsum tau rub tawm nyob rau hauv cov kev taw qhia perpendicular mus rau lub Circuit Court board nyob rau hauv lub sij hawm.Txawm hais tias lub installation txoj hauj lwm ntawm lub tivthaiv, txawm nws yog ib qho yooj yim mus nqa tawm, tsis txhob quab yuam los yog twist lub tivthaiv.Yog li tsis txhob ua kom puas lub rooj tsav xwm Circuit Court thiab lwm yam khoom.

Tsis txhob siv lub zog ntau dhau thaum desoldering.Kev xyaum ntawm prying thiab co kev sib cuag nrog ib tug hluav taws xob soldering hlau yog heev phem.Feem ntau, kev sib cuag tsis raug tso cai los ntawm rub, co, twisting, thiab lwm yam.

Ua ntej muab cov khoom siv tshiab, cov khoom siv nyob rau hauv lub ncoo hlau qhov yuav tsum tau muab ntxuav, txwv tsis pub lub ncoo ntawm lub rooj tsav xwm Circuit Court yuav warped thaum ntxig cov hlau lead ntawm cov khoom tshiab.