Withthecontinuousdevelopmentofhigh-techproductsinourcountry,theprocessdesignofcircuitboardsinmechanicalequipmentisbecomingincreasinglycomplex,andthespacingbetweenleadpinsisgettingdenseranddenser,whicheasilyleadstothephenomenonofsolderconnectionaftersoldering,thatis,shortcircuit.Forthisreason,howshouldweanalyzethecausesofwavesolderingandfindcorrespondingsolutions?Today,ShenzhenJJYSolderBarFactorywilllearnaboutthecausesofcontinuoussolderinwavesolderingandthesolutions:Continuoussolder,alsoknownasshortsolder......
ThephenomenonofpoortinpenetrationisPCBAItisworthourattention.Whetherthetinpenetrationisgooddirectlyaffectsthereliabilityofthesolderjoint.Ifthetinpenetrationeffectispoorafterwavesoldering,itiseasytocauseproblemssuchasfalsesoldering.Now,JJYsolderPasteManufacturerwillgiveyouabriefintroductionPCBACountermeasuresforpoortinpenetrationinwavesolderingduringprocessing:Requirementsfortinpenetrationrateinwavesoldering:Thetinpenetrationrateofwavesolderingpointsgenerallyneedstobeachieved75%Theabovemeansthatthetinpenetrationrateofthepanelappearanceinspectionshouldbehigherthanthatoftheboardthickness75%Thetinpenetrationrateis75%-100%......
I.SpecialPhenomenaofLead-freeSolderPasteWaveSoldering1,QFPThedeteriorationofheatedsolderjointsoccursincertainareasonthefrontofthecircuitboardQFPAfterthelead-freesolderpasteisfirmlyre-solderedonthepins,whentheyre-enterthebottomsurfaceforthesecondaryhighheatoflead-freewavesoldering,sometimesitisfoundthatafewpinswillexperiencetheundesirablephenomenonofmeltingandpeelingoff(infact,thesituationwillbeevenworsewhenthereversesideofthecircuitboardisre-solderedforthesecondtime).Method:Completelyeliminateanysourceofleadandavoidusingbismuth-containingpinmembranesor......
Duringtheuseoftinbars,thereisaconsiderableamountoftinslag,whichcanbeclassifiedintohandimmersionfurnacesandwavewavefurnaces(Wavepeakfurnacescomeinsemi-automaticandfullyautomatictypes)Let'sconductananalysis.Now,thesolderpastemanufacturerwillleadeveryonetoanalyzeit:1Generallyspeaking,forhandimmersionfurnaces,theissueofexcessivetinbarsandtinslagisunderstandableandoftenoccurs.Customershavereportedthatthetinsurfaceturnsyelloworpurple.Thissituationmightbeduetosignificanttemperaturedeviationsduringtheoperationofthefurnace,suchashightemperatureorpersistenttinfurnaces......
Duringtheentirewavesolderingprocess,tindrosswillbeproducedonthetinbar.However,sometimestheremaybeanexcessiveamountoftindross.Atthistime,itisnecessarytopayattentiontowhetherthereisaproblem.Now,thesolderpastemanufacturerwillexplainittoyou:Firstofall,wemustcorrectlydistinguishwhetherthefrequentlyoccurringtinslagisnormaltinslag.Undernormalcircumstances,tinslagthatisintheformofblackpowderisinanormalstateofproperties,whiletinslagthatisintheformoftofuresidueisabnormal.Forthiskindofsituation,weinferthatthereareproblemsasfollows......
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