Tsis muaj kub, tsis muaj leej twg zoo tag nrho", yog li PCB board.Hauv PCB vuam, vim muaj ntau yam laj thawj, ntau yam tsis xws luag feem ntau tshwm sim, xws li kev vuam virtual, overheating, bridging thiab lwm yam.Kab lus no, Peb piav qhia meej txog cov yam ntxwv zoo li, kev phom sij thiab ua rau kev tsom xam ntawm 16 hom PCB soldering tsis xws luag.

01
Vuam

Cov yam ntxwv tshwm sim: Muaj ib thaj tsam dub meej ntawm cov khoom siv thiab cov hlau lead ntawm cov khoom siv los yog nrog cov ntawv ci tooj liab, thiab cov khoom siv tau rov qab mus rau qhov ciam teb.
Kev puas tsuaj: tsis ua haujlwm zoo.
Ua rau Analysis:
Cov hlau lead ntawm cov khoom tsis raug ntxuav, tinned los yog oxidized.
Cov ntawv luam tawm tsis huv, thiab cov tshuaj txau yog qhov tsis zoo.
02
Solder tsub zuj zuj

Cov yam ntxwv tshwm sim: Cov qauv sib koom ua ke yog xoob, dawb thiab npub.
Hazard: Tsis muaj zog txhua yam, tejzaum nws tsis raug vuam.
Ua rau Analysis:
Qhov zoo ntawm solder tsis zoo.
Qhov kub ntawm soldering tsis txaus.
Thaum lub solder tsis solidified, cov hlau lead ntawm cov khoom yuav xoob.
03
Ntau dhau solder

Cov yam ntxwv tshwm sim: Lub npoo npoo yog convex.
Hazard: Cov khoom siv khib nyiab, thiab tej zaum yuav muaj qhov tsis xws luag.
Yog vim li cas tsom xam: solder rho tawm yog lig dhau lawm.
04
Me ntsis solder

Cov yam ntxwv tshwm sim: thaj chaw soldering tsawg dua 80% ntawm lub ncoo, thiab lub solder tsis tsim ib qho kev hloov ntawm qhov chaw.
Kev phom sij: tsis muaj zog txhua yam.
Ua rau Analysis:
Lub solder fluidity tsis zoo los yog lub solder yog tshem tawm ntxov dhau.
Tsis txaus flux.
Lub sijhawm vuam yog luv heev.
05
Rosin vuam

Cov yam ntxwv tshwm sim: Rosin slag muaj nyob rau hauv lub vuam.
Hazard: Tsis muaj zog txaus, tsis zoo txuas ntxiv, thiab tuaj yeem hloov mus rau thiab tawm.
Ua rau Analysis:
Muaj ntau cov welders los yog ua tsis tiav.
Lub sijhawm vuam tsis txaus thiab cua sov tsis txaus.
Cov yeeb yaj kiab oxide nto tsis raug tshem tawm.

06
overheat

Cov yam ntxwv tshwm sim: dawb solder pob qij txha, tsis muaj xim hlau luster, ntxhib nto.
Hazard: Lub ncoo yog yooj yim tev tawm thiab lub zog txo.
Yog vim li cas tsom xam: lub zog ntawm cov hlau soldering yog loj heev, thiab lub sij hawm cua sov yog ntev heev.
07
Txias vuam

Cov yam ntxwv tshwm sim: qhov saum npoo ua tau zoo li tofu, thiab qee zaum yuav muaj kab nrib pleb.
Kev puas tsuaj: Tsawg zog thiab tsis zoo conductivity.
Yog vim li cas tsom xam: lub solder jitters ua ntej nws solidifies.
08
Tsis zoo infiltration

Cov yam ntxwv tshwm sim: Kev sib cuag ntawm cov solder thiab vuam yog loj heev thiab tsis du.
Hazard: Tsis tshua muaj zog, tsis muaj lossis cuam tshuam rau ntawm thiab tawm.
Ua rau Analysis:
Lub vuam yog tsis huv.
Tsis txaus flux lossis tsis zoo.
Lub vuam yog tsis rhuab txaus.
09
Asymmetry

Cov yam ntxwv tshwm sim: solder tsis ntws hla lub ncoo.
Kev puas tsuaj: tsis muaj zog.
Ua rau Analysis:
Lub solder muaj tsis zoo fluidity.
Tsis txaus flux lossis tsis zoo.
Cov cua sov tsis txaus.
10
Lov

Cov yam ntxwv tshwm sim: Cov hlau lossis cov khoom siv lead ua tuaj yeem txav tau.
Kev phom sij: Tsis zoo los yog tsis ua haujlwm.
Ua rau Analysis:
Cov hlau lead txav ua ntej lub solder yog solidified thiab ua rau lub void.
Cov hmoov txhuas tsis ua tiav zoo (tsis zoo lossis tsis ntub).
11
Ntsej muag

Cov yam ntxwv tsos: ntse.
Kev puas tsuaj: Cov tsos mob tsis zoo, yooj yim rau kev hla.
Ua rau Analysis:
Lub flux tsawg dhau thiab lub sijhawm cua sov yog ntev dhau.
Kev khiav tawm lub kaum sab xis ntawm cov hlau tsis raug.
12
hla kev

Cov yam ntxwv tshwm sim: cov kab uas nyob ib sab txuas nrog.
Hazard: Hluav taws xob luv luv Circuit Court.
Ua rau Analysis:
Ntau dhau solder.
Kev khiav tawm lub kaum sab xis ntawm cov hlau tsis raug.

13
Pinhole

Cov tsos mob tshwm sim: kev tshuaj xyuas qhov muag lossis lub tshuab hluav taws xob qis tuaj yeem pom qhov.
Hazard: Tsis muaj zog txaus thiab yooj yim corrosion ntawm cov pob qij txha.
Yog vim li cas tsom xam: qhov sib txawv ntawm cov hlau lead thiab lub ncoo qhov loj heev.
14
npuas

Cov yam ntxwv tshwm sim: muaj qhov hluav taws kub ua pa tawm ntawm lub hauv paus ntawm cov hlau lead, thiab cov kab noj hniav yog muab zais rau hauv.
Hazard: Kev ua haujlwm ib ntus, tab sis nws yooj yim ua rau tsis zoo rau lub sijhawm ntev.
Ua rau Analysis:
Muaj qhov sib txawv loj ntawm cov hlau lead thiab lub ncoo qhov.
Tsis zoo txhuas infiltration.
Lub sijhawm vuam ntawm ob sab phaj ntsaws lub qhov los ntawm lub qhov yog ntev, thiab cov cua hauv lub qhov nthuav dav.
15
Copper ntawv ci cocked

Cov yam ntxwv tshwm sim: Cov ntawv ci tooj liab yog tev tawm ntawm cov ntawv luam tawm.
Hazard: Cov ntawv luam tawm puas lawm.
Yog vim li cas tsom xam: lub vuam lub sij hawm ntev dhau lawm thiab kub siab heev.
16
Tshem tawm

Cov yam ntxwv tshwm sim: cov pob qij txha tev tawm ntawm cov ntawv ci tooj liab (tsis yog cov ntawv ci tooj liab thiab cov ntawv luam tawm tev tawm).
Hazard: Qhib Circuit Court.
Yog vim li cas tsom xam: tsis zoo hlau plating ntawm lub ncoo.