Zoo siab txais tos rau peb lub vev xaib.

Qhov sib txawv tseem ceeb ntawm cov txheej txheem coj thiab tsis muaj cov hmoov txhuas hauv PCBA ua

Kev ua PCBA thiab SMT feem ntau muaj ob txoj hauv kev, ib qho yog txheej txheem tsis muaj cov hmoov txhuas thiab lwm qhov yog cov txheej txheem. Txhua tus paub tias txhuas muaj teeb meem rau tib neeg. Yog li ntawd, txheej txheem tsis muaj txhuas ua tau raws li qhov yuav tsum tau muaj ntawm kev tiv thaiv ib puag ncig, uas yog qhov dav dav thiab xaiv tsis tau ntawm keeb kwm. . Shenzhen Youqin Electronics koom nrog hauv kev ua lag luam ntawm SMT cov ntaub ntawv tsim khoom. Peb tsuas yog ua PCBA ua nrog cov thev naus laus zis tsis muaj hmoov txhuas. Los ntawm qhov pom ntawm qhov pom, raws li xyoo dhau los ntawm kev paub, peb tsis xav tias PCBA ua cov nroj tsuag qis dua qhov ntsuas (hauv qab 20 SMT kab) muaj peev xwm lees txais ob qho tib si tsis muaj hmoov txhuas thiab tsis muaj hmoov txhuas ua SMT ua xaj, vim tias khoom siv, khoom siv, thiab txheej txheem Qhov sib txawv tuaj yeem muab faib ua qhov nce tus nqi thiab nyuaj ntawm kev tswj hwm.

Hauv qab no, qhov sib txawv ntawm cov txheej txheem txhuas thiab cov txheej txheem tsis muaj cov hmoov txhuas yog cov ntsiab lus luv luv raws li hauv qab no, muaj qee qhov tsis txaus, Kuv vam tias koj tuaj yeem kho kuv.

The main difference between leaded and lead-free processes in PCBA processing

1 Cov hlau sib xyaw muaj qhov sib txawv: tin-lead muaj pes tsawg leeg ntawm cov txheej txheem txhuas yog 63/37, thaum tsis muaj cov hlau lead muaj pes tsawg leeg yog SAC 305, uas yog, Sn: 96.5%, Ag: 3%, Cu: 0.5%. Cov txheej txheem tsis muaj hmoov txhuas tsis tuaj yeem lav tau tias nws tsis muaj cov hmoov txhuas, tsuas yog muaj cov ntsiab lus qis heev ntawm cov hlau lead, xws li cov hlau lead hauv qab 500 PPM.

2. Cov ntsiab lus sib txawv: cov ntsiab lus yaj ntawm cov hlau lead yog 180 ° ~ 185 °, thiab qhov kub ua haujlwm yog li 240 ° ~ 250 °. Lub ntsiab lus yaj ntawm cov hlau tsis muaj hmoov txhuas yog 210 ° ~ 235 °, thiab ua haujlwm kub yog 245 ° ~ 280 °. Raws li kev paub dhau los, rau txhua 8% -10% nce hauv cov ntsiab lus tin, cov ntsiab lus melting nce txog 10 degrees, thiab qhov kub ua haujlwm nce 10-20 degrees.

3 Tus nqi sib txawv: tus nqi ntawm tin yog kim dua li cov hlau lead. Thaum cov khoom siv tseem ceeb sib npaug tau hloov nrog cov tin, tus nqi ntawm cov laug yuav nce sai. Yog li ntawd, tus nqi ntawm cov txheej txheem tsis muaj cov hlau lead ntau dua li cov txheej txheem txhuas. Cov ntaub ntawv qhia pom tias cov tin tin rau yoj yoj thiab cov xaim hlau rau kev siv lub tshuab ua kom huv, cov txheej txheem tsis muaj cov hmoov txhuas yog 2.7 npaug siab dua cov txheej txheem txhuas, thiab cov tshuaj txhuam txhuam rau rov ua kom rov zoo dua tus nqi tau nce li ntawm 1.5 npaug.

4 Cov txheej txheem sib txawv: txheej txheem txheej txheem thiab txheej txheem tsis muaj cov hlau lead tuaj yeem pom los ntawm lub npe. Tab sis tshwj xeeb rau cov txheej txheem, cov laug, cov khoom siv, thiab cov cuab yeej siv, xws li cov khoom siv hluav taws xob sib txuas, cov tshuab luam ntawv muab tshuaj txhuam, thiab cov hlau tsis zoo rau kev siv tshuaj txhuam, yog qhov sib txawv. Qhov no kuj yog qhov laj thawj tseem ceeb vim li cas nws thiaj li nyuaj rau tuav ob qho tib si ua thiab tsis muaj cov txheej txheem txhuas nyob rau tib lub sijhawm hauv kev ua haujlwm me me PCBA.

Lwm qhov sib txawv xws li txheej txheem txheej txheem, kev ua haujlwm tsis zoo, kev tiv thaiv ib puag ncig, thiab lwm yam kuj txawv. Cov txheej txheem txheej txheem ntawm cov txheej txheem txhuas yog loj dua thiab qhov ua kom muaj zog yuav zoo dua. Txawm li cas los xij, vim tias cov txheej txheem tsis muaj cov hmoov lead ntau nyob rau hauv txoj kab nrog kev tiv thaiv ib puag ncig, thiab nrog kev nce qib txuas ntxiv ntawm thev naus laus zis, cov txheej txheem thev naus laus zis tsis muaj hmoov txhuas tau dhau los ua kev ntseeg tau thiab paub tab.


Sijhawm Tshaj Tawm: Aug-26-2021