Teeb meem thiab kev ntsuas ntawm yoj soldering (3)
Nov 25, 2019| Shenzhen Shenchuang Hi-tech Electronics Co., Ltd (SChitec) yog lub tuam txhab ua haujlwm siab uas tshwj xeeb hauv xov tooj accessories ntau lawm thiab muag khoom. Peb cov khoom tseem ceeb muaj xws li kev mus ncig, chargers tsheb, USB cables, fais fab nyiaj hauv tuam txhab nyiaj thiab lwm yam khoom siv digital.Tag nrho cov khoom muaj kev nyab xeeb thiab txhim khu kev qha, nrog cov cim styles.products dhau daim ntawv pov thawj xws li CE, FCC, ROHS, UL, PSE, C-Tick, thiab lwm yam. , Yog tias koj txaus siab rau, koj tuaj yeem tiv tauj ceo@schitec.com ncaj qha.
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Teeb meem thiab kev ntsuas ntawm yoj soldering (3)
Solder pob (hli)
Yog hais tias lub preheating kub ntawm PCB yog tsawg dhau los yog lub sij hawm preheating yog luv luv, qhov hnyav thiab noo noo nyob rau hauv lub flux yuav tsis volatilize, uas yuav ua rau solder spatter thaum vuam. Ua kom lub preheating kub los yog ncua lub sij hawm preheating.
Ua rau ntawm spatter pob (bead):
1. PCB yog damped thaum lub sij hawm tsim khoom los yog cia.
2. Cov av noo ib puag ncig yog siab, cov dej noo condenses ntawm multi slit PCB, thiab tsis muaj noo noo soj ntsuam ntsuas nyob rau hauv cov nroj tsuag.
3. Cov txheej thiab flux yog insoluble, thiab flux tsis raug xaiv.
4. Cov flux raug tshem tawm lossis cov txheej txheej tsis haum rau hauv cheeb tsam, thiab cov flux absorbs noo noo thiab dej.
5. Cov txheej txheem vuam tsis zoo, nrog cov khoom seem.
6. Kev ua haujlwm tsis zoo ntawm lub hauv paus phaj thiab lub qhov ntxhib ntawm phab ntsa ua rau cov khoom ntim ntawm cov kua tank, uas tsis tau txheeb xyuas hauv PCB tsim.
7. Qhov kub tsis zoo preheating.
8. Nyiaj plated qhov chaw yog ntom.
9. Kev xaiv tsis raug ntawm solder crest zoo.
Spatter daws:
1. Hloov PCB cia tej yam kev mob kom txo tau noo noo.
2. Xaiv cov flux tsim nyog.
3. Txau flux tusyees thiab ua kom kub preheating.
4. Hloov cov txheej txheem tsim PCB thiab txheeb xyuas cov thermal uniformity.
5. Qhib tiaj yoj shaping PCB solder sib koom.
Cua qhov (npuas / pinhole)
Yog hais tias lub impurity ntawm solder tshaj tus qauv thiab cov ntsiab lus Al siab dhau lawm, lub solder sib koom yuav khoob. Hloov lub solder.
Qhov saum npoo oxide, residue thiab kuab paug ntawm solder yog loj. Cov khib nyiab yuav raug tshem tawm thaum kawg ntawm txhua hnub ua haujlwm.
Lub kaum sab xis nce toj ntawm PCB yog me me, uas tsis tsim nyog rau cov pa tawm. PCB nce lub kaum sab xis yog 3-7 degree
Lub ncov qhov siab yog qis dhau, uas tsis yog qhov tsim nyog rau kev tso pa tawm. Lub ncov siab yog feem ntau tswj ntawm 2/3 ntawm PCB thickness.
Ua rau ntawm qhov tsim ntawm huab cua qhov (npuas los yog pinhole):
1. Ntau dhau flux lossis ntim tsis txaus ua ntej vuam.
2. Lub hauv paus phaj yog damped.
3. Qhov sib txawv ntawm qhov chaw thiab cov hlau lead yog qhov loj thiab cov pa tawm ntawm lub hauv paus phaj tsis du.
4. Lub qhov hlau tsis zoo.
Thaum lub sij hawm yoj soldering, lub peev xwm ntawm lub rhuab matrix yog loj heev. Txawm hais tias soldering dhau lawm, nws tseem tsis tau txias. Vim lub thermal inertia, qhov kub thiab txias tseem nce. Nyob rau lub sijhawm no, sab nraud ntawm qhov sib koom ua ke pib ua kom muaj zog, thaum qhov kub thiab txias ntawm qhov sib koom ua ke txo qis, thiab cov roj seem txuas ntxiv nthuav dav. Extruding txheej txheej yuav tsuag tawm lub solidified solder los tsim cov puab puab thiab pores ntawm lub solder sib koom.
Pore (npuas los yog pinhole) tov:
1. Ua kom kub preheating thiab muab tag nrho ua si rau flux.
2. Txo lub substrate ua ntej cia lub sij hawm.
3. Tsim vuam ncoo kom raug kom huv si kom huv si
4. Tiv thaiv oxidation thiab muaj kuab paug ntawm cov ntaub qhwv hlau.
Kev ntub dej tsis zoo < cov ntaub ntawv tsis zoo ntawm cov weldability tsis zoo vim muaj cov kab mob loj heev. Tsis wetting thiab semi wetting coexist nyob rau tib qhov chaw tib lub sijhawm
Lub adhesion ntawm cov hlau electrode nyob rau hauv qhov kawg ntawm cov khoom nti yog cov tsis zoo los yog ib txheej txheej electrode yog siv, uas ua rau decapping phenomenon nyob rau hauv lub vuam kub. Peb txheej txheej kawg yog siv nyob rau hauv yoj soldering ntawm nto mount Cheebtsam, uas muaj peev xwm tiv tau ob los yog ntau tshaj 260 degree yoj soldering kub shocks.
PCB tsim yog tsis tsim nyog, duab ntxoov ntxoo nyhuv nyob rau hauv yoj soldering ua rau solder ploj. Ua tau raws li DFM tsim cov cai
PCB warps, ua rau PCB warping txoj hauj lwm nyob rau hauv kev sib cuag tsis zoo nrog yoj crest. PCB warpage tsawg dua {{0}} 8-1.0%
Ob sab ntawm txoj siv conveyor tsis sib npaug, yog li PCB thiab yoj crest kev sib cuag tsis yog sib npaug. Kho cov qib.
Lub yoj crest tsis du, thiab qhov siab ntawm ob sab ntawm yoj crest tsis yog sib npaug. Tshwj xeeb tshaj yog, yog hais tias lub tin yoj nozzle ntawm lub tshuab electromagnetic twj yoj soldering yog thaiv los ntawm oxide, lub yoj crest yuav tshwm serration, uas yog ib qho yooj yim ua rau ploj welding thiab tsis muaj vuam. Ntxuav lub tin yoj nozzle.
Kev ua dej tsis zoo ua rau muaj dej tsis zoo. Hloov cov flux.
PCB preheating kub yog siab dhau lawm, kom cov flux carbonization, poob ntawm kev ua si, ua rau tsis zoo wetting. Teem lub preheating kub kom zoo.
Tsis wetting thiab anti wetting
Tsis ntub dej: nruam solder zaj duab xis yog tsim los ntawm cov hlau yooj yim tom qab yoj soldering. Nyob rau ntawm qhov chaw tsis ntub, lub solder tsis sib cuag nrog lub hauv paus hlau, tab sis lub hauv paus hlau nto tuaj yeem pom los ntawm paj rwb xov.
Anti wetting: yoj soldering solder thawj moistens lub hauv paus hlau nto thiab ces retracts nrog tsis txaus wetting tawm ib txheej ntawm heev yoj solder nyob rau hauv lub hauv paus hlau nto. Nyob rau tib lub sijhawm, muaj qee cov khoom sib cais sib cais. Lub pob loj loj muaj lub kaum sab xis loj ntawm qhov chaw sib cuag ntawm lub hauv paus hlau.
Anti wetting zoo ib yam li qhov tshwm sim ntawm semi wetting ntawm qhov chaw ntawm cov hlau tsis ntub dej
Thaum cov hlau impurity concentration nyob rau hauv lub solder zawj mus txog ib tug tej yam nqi, semi wetting kuj tshwm sim.