Puas yog soldering hlau lom rau tib neeg?
Solder hlau yog ib yam khoom siv rau soldering nrog hluav taws xob soldering hlau. Txawm hais tias nws cov khoom tseem ceeb yog tin, nws kuj muaj lwm yam hlau. Feem ntau muab faib ua hmoov txhuas thiab tsis muaj hmoov txhuas (xws li ib puag ncig tus phooj ywg). Nrog rau kev taw qhia ntawm EU ROHS tus qauv, ntau thiab ntau PCB vuam factories tam sim no xaiv cov hlau lead-dawb thiab ib puag ncig tus phooj ywg solder xov hlau. Lead solder hlau kuj maj mam hloov, thiab ib puag ncig tus phooj ywg solder hlau tsis tuaj yeem raug xa tawm. Lead-free solder paste, lead-free solder wire, thiab lead-free solder bars yog cov khoom tseem ceeb tam sim no ntawm lub khw.
Txhawm rau muab nws yooj yim: Kev phom sij Feem ntau siv solder muaj qhov taw tes qis thiab muaj txog 60% txhuas thiab 40% tin, yog li lub solder nws tus kheej yog tshuaj lom. Feem ntau cov solders nyob rau hauv lub lag luam yog hollow thiab puv nrog rosin, yog li cov roj uas koj tau hais yog tej zaum emission thaum lub rosin nyob rau hauv lub solder melts thaum vuam. Cov pa tawm los ntawm rosin kuj yog tshuaj lom me ntsis thiab tsw tsw ntxhiab tsw. Qhov teeb meem tseem ceeb ntawm kev sib tsoo thaum lub sij hawm vuam yog txhuas fume. Txawm tias tsis muaj hlau lead-dawb solder muaj qee yam ntawm cov hlau lead. Tus nqi txwv ntawm cov pa luam yeeb hlau lead hauv GBZ2-2002 yog tsawg heev, nws muaj tshuaj lom heev thiab yuav tsum muaj kev tiv thaiv tshwj xeeb. Vim muaj kev puas tsuaj los ntawm cov txheej txheem vuam rau tib neeg lub cev thiab ib puag ncig, hauv Tebchaws Europe, kev tiv thaiv cov neeg ua haujlwm vuam thiab kev tiv thaiv ib puag ncig tau ua raws li kev cai lij choj. Vuam tsis muaj kev tiv thaiv yog tsis tso cai. ISO14000 tus qauv muaj cov kev cai meej ntawm kev kho thiab kev tiv thaiv cov pa phem hauv cov txheej txheem tsim khoom.
Tin tag nrho muaj cov hmoov lead. Yav dhau los, muaj cov hmoov txhuas nyob rau hauv cov hlau solder cais soldering raws li kev ua haujlwm txaus ntshai (hauv National Occupational Disease Catalog). Tam sim no feem ntau ntawm peb cov tuam txhab siv lead-free solder hlau. Cov khoom tseem ceeb yog tin, raws li ntsuas los ntawm Lub Chaw Tiv Thaiv Kab Mob thiab Tiv Thaiv. Nws yog tin dioxide; nws tsis yog nyob rau hauv National List of Occupational Diseases. Feem ntau hais lus, txhuas fumes yuav tsis tshaj tus qauv hauv cov txheej txheem tsis muaj txhuas, tab sis soldering kuj muaj lwm yam teeb meem. Piv txwv li, flux (rosin-zoo li tshuaj) muaj qee yam kev phom sij. Nws nyob ntawm qhov xwm txheej tshwj xeeb. Cov neeg ua haujlwm feem ntau tuaj yeem tshawb xyuas cov cim ntawm cov tin faib thiab cov pawg twg nws nyob, kom lawv tuaj yeem muaj pov thawj thiab thov kom lub tuam txhab ua kev kho dua tshiab (lawv tuaj yeem muab cov lus qhia rau lub koom haum ua haujlwm sab hauv). Yog tias cov tin siv muaj cov hmoov txhuas, nws yuav ua rau muaj kev phom sij rau lub cev. Nyob rau tib lub sijhawm, lawv khaws cia hauv lub cev thiab ua rau muaj kev puas tsuaj loj rau lub cev tsis muaj zog ntawm lub paj hlwb.
Lead-free solder hlau yog ib puag ncig tus phooj ywg, tab sis nws kuj yog teeb meem rau tib neeg lub cev. Cov ntsiab lus ntawm cov hlau lead uas tsis muaj hlau lead tsis tau txhais hais tias nws tsis muaj cov hlau lead. Piv nrog cov hlau lead uas muaj cov hlau lead, cov hlau tsis muaj hlau lead yog qhov teeb meem rau ib puag ncig thiab tib neeg lub cev. Kev kis kab mob tsawg dua cov hlau lead. Cov pa roj uas tsim tawm thaum lub sij hawm soldering yog tshuaj lom, nrog rau cov roj rosin, zinc chloride thiab lwm yam roj vapors.
