Kev paub me me ntawm qhov chaw nres tsheb soldering - dab tsi yog qhov cuam tshuam ncaj qha rau lub teeb ci ntawm cov pob qij txha?
Txawm hais tias qhov vuam taw tes yog qhov ci kuj yog qhov tseem ceeb hauv cov txheej txheem vuam. Txawm hais tias cov pob qij txha yog ci los yog tsis cuam tshuam rau qhov zoo ntawm cov khoom. Tam sim no ntau tus neeg siv khoom lag luam muaj qee qhov kev xav tau rau cov tsos ntawm cov khoom. Nws raug nquahu kom peb them sai sai rau qhov ci ntsa iab ntawm cov pob qij txha thaum ua tiav cov txheej txheem thiab soldering ntawm solder paste. Nyob rau hauv cov txheej txheem ntawm solder paste nti ua thiab vuam, nws tsis tau lees tias qhov ci ntsa iab ntawm txhua qhov sib koom ua ke tuaj yeem ua tau raws li qhov yuav tsum tau ua, yog li dab tsi yog qhov cuam tshuam ncaj qha rau qhov tsis txaus ci ntawm cov pob qij txha nyob rau hauv cov txheej txheem solder chips? Niaj hnub no, solder paste manufacturers yuav coj koj los nkag siab thiab txheeb xyuas:
Cov laj thawj uas cuam tshuam ncaj qha rau qhov ci ntsa iab ntawm cov pob qij txha yog tsis muaj dab tsi ntau tshaj li cov hauv qab no, uas yog vim li cas rau kev ua haujlwm ntawm cov txheej txheem tsim khoom thiab cov teeb meem ntawm cov khoom siv vuam.
ib qho, cov txheej txheem ua haujlwm hauv cov txheej txheem ntau lawm:
1. Thaum lub sij hawm tsim khoom, qhov kub thiab txias ua hauj lwm nyob rau hauv lub cub tawg yog nyob deb ntawm txaus los yog qhov kub ntawm lub cub tawg nce, uas yuav ua rau lub solder sib koom luminosity nyob deb ntawm txaus;
2. Yog hais tias lub sij hawm reflow yog ntev dhau lawm thiab lub preheating kub yog tsawg heev, nws tseem yuav ua rau discoloration ntawm solder pob qij txha, thiab nitrogen tiv thaiv yuav ntxiv.
3. Yog tias qhov cua txias ua tiav raws sijhawm lossis qhov txias txias qeeb, yuav muaj qhov dullness, thiab qhov ci ntawm cov pob qij txha tuaj yeem daws tau los ntawm kev ua kom txias txias.
Ob, qhov teeb meem ntawm cov khoom siv vuam:
1. Cov pob qij txha ntawm cov tin-lead alloy solder paste yuav ci dua li cov hlau lead-dawb solder paste, thiab cov npoo ntawm cov pob qij txha ntawm cov hlau lead-dawb solder paste yuav rougher. Thaum xav tau cov hmoov lead-free solder paste, nws tuaj yeem hloov kho rau cov khoom siv lead-free solder paste tuaj yeem txhim kho qhov ci ntawm cov pob qij txha;
2. Solder paste muaj nyiaj surfactant. Peb muaj ntau yam kev lag luam xav tau rau lub luminosity ntawm solder pob qij txha. Cov neeg feem coob zoo siab tos txais cov pob qij txha ci ntsa iab, tab sis qee cov neeg xav tias qhov ci ntsa iab tsis zoo cuam tshuam rau qhov kev soj ntsuam niaj hnub. Yog li ntawd, ib co solder pastes siv tag nrho cov neeg sawv cev matting. Nws raug nquahu kom koj them sai sai rau cov khoom siv flux ntawm cov tshuaj txhuam hniav thaum yuav cov tshuaj txhuam hniav.
3. Lub degree ntawm oxidation ntawm solder paste yog siab dhau. Nws raug nquahu kom siv tag nrho hauv 24 teev tom qab cov tshuaj txhuam hniav raug tshem tawm. Nws yuav tsum tau khaws cia ntawm 3-5 degree ua ntej cia.
