Magulu a Magawo

Kusamalira zinthu zowotcherera

1. Kodi ma ratio a zigawo ndi ubwino wa magwiridwe antchito a solder wamba wopanda lead SAC305 ndi ati?

Kapangidwe kake: Sn96.5Ag3.0Cu0.5, malo osungunuka 217℃. Ubwino: 30% yolimba yolimbana ndi okosijeni, ikutsatira malangizo a RoHS, kudalirika kwamphamvu pa kutentha kwambiri, komanso kusunga mphamvu yamakina yoposa 85% itatha kukalamba pa 150℃ kwa maola 1000.
2. Kodi mfundo ya eutectic ya solder alloys imakhudza bwanji njira yowotcherera?

Ma solder a Eutectic (monga Sn63Pb37) alibe malo okhala ndi madzi olimba akasungunuka, okhala ndi zenera lopapatiza lotenthetsera kutentha, zomwe zimafuna kuti kutentha kwa soldering peak kukhale 50-70℃ kuposa malo osungunuka; ma solder omwe si a eutectic ali ndi malo okhala ndi madzi olimba, zomwe zimafuna kuwongolera kutentha kolondola kuti apewe kusungunuka kosakwanira.
3. Kodi mungasiyanitse bwanji zochitika za kugwiritsa ntchito flux ndi magawo osiyanasiyana a ntchito?

Giredi R (ntchito yochepa): Zochitika zaukhondo kwambiri monga ndege ndi zamankhwala, ndi kukana kutetezedwa kwa zotsalira ≥10¹²Ω;

Giredi ya RA (ntchito yapakati): Zipangizo zamagetsi zogwiritsidwa ntchito ndi ogula, zomwe zimatha kuwongolera kuchuluka kwa zolakwika zowotcherera ≤0.5%;

Gulu la SA (ntchito yamphamvu): Malo omwe ali ndi okosijeni kwambiri, omwe amafunika kutsukidwa mosamala kuti apewe dzimbiri.
4. Kodi miyezo ya kuchuluka kwa waya wothira ndi iti ndipo imakhudza bwanji kuwotcherera?

Kuchuluka kwa zinthu: 1.0%-3.0%. Kuchuluka kwambiri kwa zinthu kumapangitsa kuti mafilimu a oxide asachotsedwe mokwanira, zomwe zimapangitsa kuti chiwopsezo cha zinthuzo chiwonjezeke ndi 20%-30%; kuchuluka kwambiri kwa zinthu kumayambitsa zotsalira zambiri zomwe zimakhudza kutetezedwa kwa zinthu, ndipo 1.8%-2.2% imagwiritsidwa ntchito kwambiri popanga zinthu zamagetsi.
5. Kodi kufalikira kwa tinthu tating'onoting'ono ta ufa wachitsulo mu solder phala kumakhudza bwanji magwiridwe antchito osindikizira?

Mtundu 3 (25-45μm): Yoyenera ma pads okhala ndi mtunda woposa 0.5mm, chiwopsezo cha defect defitting printing defect
Mtundu 4 (20-38μm): Yoyenera mtunda wocheperako wa 0.3mm, yomwe imatha kutsekeka ndi stencil ndi magawo osayenera (mwayi +15%).
6. Kodi kutentha ndi chinyezi zomwe zimaloledwa kusinthasintha ndi ziti m'malo osungira zinthu zosungunulira?

Kutentha: 0-10℃ (mkati mwa ±2℃ kusinthasintha), chinyezi: RH≤60%. Kuchuluka kwa kusintha kwa kukhuthala kumawonjezeka ndi 5%-8% patsiku pamene kusinthasintha kwa kutentha kumapitirira ±2℃, ndipo chinyezi chochuluka chimafulumizitsa okosijeni.
7. Kodi nthawi yosungira waya wosatsegulidwa ndi yotani?

Waya wothira wopangidwa ndi lead: zaka 3-5 (15-25℃, RH≤60%);

Waya wosokera wopanda lead: zaka 2-3. Kuchuluka kwa okosijeni kumawonjezeka pakapita nthawi, ndipo ma pores amatha kukwera kufika pa 10%-15%.
8. N’chifukwa chiyani madzi otuluka ayenera kusungidwa kutali ndi kuwala?

Zinthu zogwira ntchito za flux (monga organic acids) zimawonongeka mofulumira zikakumana ndi kuwala, ndipo ntchito zimachepa ndi 40% pambuyo pa mwezi umodzi kuchokera pamene kuwala kumaonekera, pomwe 10%-15% yokha imachepa pa miyezi 6 yosungira popanda kuwala.
9. N’chifukwa chiyani kusakaniza sikuloledwa panthawi yobwezeretsa kutentha kwa solder phala yotengedwa kuchokera ku malo ozizira?

Kusakaniza kumayambitsa kutentha kwa mkati kosafanana, zomwe zimapangitsa kuti kutentha kuzizire msanga kapena kusinthasintha kwa solvent. Kusinthasintha kwa kukhuthala kwa ≤5% pambuyo pa maola 4-6 kutentha kuchira, pomwe kusakaniza kosayenera (kusakaniza kosayenera) kungayambitse kusinthasintha kwa 20%.
10. Kodi nthawi yowerengera kutentha ndi chinyezi m'malo osungira solder ndi yotani?

Linganizani miyezi 6 iliyonse kuti muwonetsetse kuti kutentha kuli kolakwika ±1℃ ndi chinyezi ±3%RH, kupewa malo osungira zinthu osalamulirika.
11. Kodi nthawi yochuluka yogwiritsira ntchito phala lotseguka la solder pa makina osindikizira ndi iti?

Kugwiritsa ntchito kosalekeza sikuyenera kupitirira maola 8 kutentha kwa chipinda 20-25℃ ndi RH≤60%. Kukhuthala kumawonjezeka ndi 30%-50% ikapitirira, ndipo chilema chosindikizira chikukwera kufika pa 15%-20%.
12. Kodi mungadziwe bwanji momwe solder liquid imasinthira mu thanki yosungunula mafunde?

Dziwani kuchuluka kwa zinthu zomwe zapangidwa ndi kuchuluka kwa zinyalala za solder, sinthani PCB iliyonse ya 500-1000㎡ yopangidwa; sinthani pasadakhale pamene mulingo wa mkuwa >0.8%, apo ayi chilema chimawonjezeka ndi 25%-35%.
13. Kodi pali ubale wotani pakati pa kugwiritsidwa ntchito kwa waya wothira ndi kukula kwa cholumikizira cha solder pakuwotcherera kosankha?

Kugwiritsa ntchito kumawonjezeka ndi 15%-20% pa kuwonjezeka kulikonse kwa 0.1mm kwa m'mimba mwake wa cholumikizira cha solder. Kugwiritsa ntchito kumatha kukhala 预估 (kunenedweratu) powerengera kuchuluka kwa cholumikizira cha solder (SAC305 density 7.4g/cm³).
14. Kodi kuphatikiza kwabwino kwambiri kwa kutentha kwa nsonga ya chitsulo chosungunula ndi nthawi yosungunula powotcherera ndi manja ndi kotani?

Kutentha: 350-380℃, nthawi: masekondi 2-3. Kupitirira masekondi 400℃ kapena >5 kumawononga mosavuta zinthu,
15. Kodi ngodya ya squeegee imakhudza bwanji khalidwe la kusindikiza panthawi yosindikiza solder paste?

Ngodya ya 45°-60° ndi yabwino kwambiri. 60° kungathe kuphulika ndi kuzizira, ndipo chiwopsezo cha zolakwika chikuwonjezeka ndi 8%-10% pa kusintha kulikonse kwa 5°.
16. Kodi mungazindikire bwanji malo opanda kanthu mkati mwa malo olumikizirana pogwiritsa ntchito X-Ray?

X-Ray imatha kuzindikira malo opanda kanthu okhala ndi mainchesi ≥0.1mm. Muyezo wa IPC-A-610: malo opanda kanthu ≤25% pazinthu za kalasi B, ≤15% za kalasi C, ndi malo opanda kanthu ambiri omwe amakhudza kutentha ndi mphamvu.
17. Kodi mikhalidwe yokhazikika ndi mitundu yovomerezeka ya kupotoka poyesa kukhuthala kwa solder paste ndi iti?

Mikhalidwe: 25±0.5℃, liwiro lozungulira 5rpm, yesani kwa masekondi 60. Kukhuthala kokhazikika kwa SAC305: 80-120Pa·s, kusintha kumafunika ngati kupotoka kukupitirira ±15%.
18. Kodi njira zoyesera mphamvu yokoka ndi ziti zomwe zimagwiritsidwa ntchito poyesa malo olumikizirana ndi solder?

Yesani ndi choyezera chokoka pa liwiro la 5mm/min. ≥0.5N pa phukusi la 0603, ≥1.5N pa ma lead a QFP, mphamvu zosakwanira zomwe zimatha kulephera mukagwedezeka.
19. Kodi tingayang'ane bwanji kapangidwe kake ka ma solder joints pogwiritsa ntchito metallographic sectioning?

Yang'anani pogwiritsa ntchito maikulosikopu mutamaliza kupukuta ndi kupukuta, poyang'ana makulidwe a IMC layer (1-3μm ya SAC305), >5μm imapangitsa kuti zolumikizira za solder zikhale zofooka ndipo zimafupikitsa moyo ndi nthawi yoposa 50%.
20. Kodi muyezo woyesera kuyera kwa ayoni pa zotsalira za flux ndi wotani?

Kuyesa pogwiritsa ntchito ion chromatography, zotsalira za ion pa gawo lililonse ≤1.5μg/cm² (mu NaCl yofanana), kupitirira muyeso kumayambitsa kusamuka kwa ma electrochemical short circuits.
21. Kodi kutentha kwa kutentha mu gawo lokonzekera kutentha kwa soldering kumakhudza bwanji kuwotcherera?

Mlingo wa 1-3℃/s ndi woyenera. >5℃/s yomwe imakhala ndi kutentha kwambiri,
22. Mu ndondomeko yosokera mafunde awiri, kodi ntchito ndi makonda a mafunde akutsogolo ndi akumbuyo ndi otani?

Mafunde akutsogolo (mafunde ogwedezeka): Kutalika kwa mafunde 30-50mm, liwiro 2-3m/min, kumatuluka madzi ndi mpweya;

Mafunde akumbuyo (mafunde osalala): Kutalika kwa mafunde 20-30mm, liwiro 1.5-2.5m/min, kumapanga malo olumikizirana.
23. Kodi mungachepetse bwanji kugwa kwa solder phala mwa kukonza kapangidwe ka stencil?

Gwiritsani ntchito mipata yolowera ndi ngodya zozungulira zodulidwa ndi laser. Chepetsani kutseguka kwa QFP kwa 0.3mm pitch ndi 10%-15% ndikuwonjezera ngodya zozungulira za 0.05mm, kuchepetsa kuchuluka kwa kugwa kuchokera pa 12% mpaka 3%-5%.
24. Kodi chitetezo cha nayitrogeni chimakhudza bwanji ubwino wa kuwotcherera pakuwotcherera kosankha?

Malo okhala nayitrogeni (kuchuluka kwa mpweya
25. Kodi mungasinthe bwanji kuchuluka kwa kuzizira kwa soldering malinga ndi makulidwe a PCB?

Pakuwonjezeka kulikonse kwa makulidwe a PCB a 0.5mm, chepetsani kuzizira ndi 1-2℃/s. Kuzizira mofulumira kwambiri (>5℃/s) kwa matabwa okhuthala omwe amatha kusweka, ochedwa kwambiri kumakhudza magwiridwe antchito ndipo kumayambitsa kukhuthala.
26. Kodi mfundo yofananira pakati pa liwiro la kuchotsera makina osindikizira ndi kukhuthala kwa solder paste ndi iti?

Kukhuthala kwakukulu, liwiro lotulutsa limachepa. Kukhuthala kwakukulu (>150Pa·s): 1-2mm/s, kukhuthala kochepa (
27. Kodi pali ubale wotani pakati pa kuchuluka kwa malo otentha osinthira kutentha ndi kuwotcherera kwa bolodi la circuit board?

Zipangizo zokhala ndi madera 8 kapena kuposerapo kutentha ndizoyenera kwambiri ma circuit board okhala ndi kuchuluka kwakukulu, zomwe zimapangitsa kuti chiŵerengero cha kutentha chiwonjezeke kuchoka pa 85% kufika pa 95% poyerekeza ndi zida zokhala ndi madera 6, ndi kuwongolera kutentha kolondola kwambiri.
28. Kodi chipangizo chosakaniza mu thanki yosungunula mafunde chimakhudza bwanji kufanana kwa madzi osungunula?

Liwiro lozungulira la 20-40rpm limapereka kufanana kwabwino kwa solder liquid. Mukasiya kusakaniza, kusiyana kwa kutentha pakati pa zigawo zapamwamba ndi zotsika kumawonjezeka ndi 3-5℃ pa ola limodzi, ndi kuwonjezeka kwa kupotoka kwa kapangidwe ndi chilema ndi 10%-15%.
29. Kodi kulondola kwa kuchuluka kwa tin spray ya nozzle yosankha yolumikizira zinthu pa malo olumikizirana ang'onoang'ono olumikizira zinthu kumakhudza bwanji?

Kulondola kuyenera kulamulidwa mkati mwa ±0.01mg. Pa ma paketi a 0201, kupotoka >±0.02mg kumawonjezera mwayi woti soldering ikhale yochepa/yosakwanira ndi 40%-50%, zomwe zimakhudza kwambiri phindu.
30. Kodi mphamvu yolamulira mphamvu ya makina odyetsera waya wothira magetsi ndi yotani?

Kupsinjika kwa 0.8-1
31. Kodi njira yokhazikika komanso njira zodzitetezera pokonzanso solder yopanda lead ndi ziti?

Njira: Kusonkhanitsa kwapadera → kusungunula ndi kuchotsa zinyalala → kusintha kapangidwe kake. Kutentha kwa kusungunula 280-320℃, kuchuluka kwa zitini ≥99.5% mutachotsa zinyalala. Pewani kuipitsa zitsulo zolemera; madzi otayira ayenera kuchepetsedwa mphamvu ndikuwotchedwa kuti akwaniritse miyezo ya GB 8978-1996 yotulutsira zinyalala.
32. Kodi zigawo zazikulu za mpweya wosasunthika womwe umatuluka ndi ziti komanso malire ake owonekera pantchito?

Muli abietic acid ndi isopropanol. Malire a kukhudzana ndi ntchito: abietic acid 5mg/m³ (nthawi yoyezedwa), isopropanol 980mg/m³. Khalani ndi mpweya wabwino kwambiri kuti mupewe kukwiya kwa kupuma komanso mitsempha.
33. Kodi malamulo okhudza kugawa zinyalala zoopsa ndi zofunikira pa zinthu zosungunulira zinyalala ndi ziti?

Yolembedwa kuti HW49 (code 900-041-49), iyenera kutayidwa ndi mayunitsi oyenerera, kutsatira Miyezo Yoyang'anira Zinyalala Zoopsa, komanso kuletsa mwamphamvu kusakaniza ndi zinyalala zapakhomo.
34. Kodi zofunikira za kalasi yosaphulika m'malo osungiramo zinthu zotayidwa ndi ziti?

Galimoto ya Ex dⅡBT4 yosaphulika imafunika posungira mphamvu yoyaka. Gwiritsani ntchito magetsi/maswichi osaphulika ndipo muletse zida zopangira nthunzi. Kusatsatira malamulo kumawonjezera chiopsezo cha moto/kuphulika ndi 30%-50%.
35. Kodi mungapewe bwanji kusungunuka kwa zinyalala za solder panthawi yosungira?

Sungani m'zidebe zouma zotsekedwa bwino zokhala ndi 0.5%-1.0% BHT antioxidant. Kuchuluka kwa okosijeni kumawonjezeka ndi 50% mkati mwa maola 24 mukakhala pamalo otsekedwa; kusungidwa kotsekedwa kumawonjezera nthawi yobwezeretsanso zinthu mpaka miyezi 3-6.
36. Kodi mungachepetse bwanji ndalama pokonza makulidwe a kusindikiza kwa solder phala?

Chepetsani makulidwe kuyambira 0.15mm mpaka 0.12mm potsatira malamulo a khalidwe, kuchepetsa kugwiritsa ntchito ndi 20%-25%. Kukonza bwino kwa DOE kumachepetsa mtengo wa PCB iliyonse ndi 0.3-0.5 RMB.
37. Kodi kuchuluka kwa kutayika kwa waya wosokera ndi njira zochepetsera ndi kotani m'makampani?

Avereji ya mafakitale: 8%-12%. Njira: Kudyetsa mawaya okha (kumachepetsa kutayika ndi 3-5%), njira zabwino (kumachepetsa kusungunula kopanda kanthu ndi 15%-20%), kubwezeretsanso zinyalala za mawaya (70%-80% kuchira), kungachepetse kufika pa 5%-8%.
38. Kodi njira yowerengera mtengo ndi magwiridwe antchito a ma solder phala ochokera ku mitundu yosiyanasiyana ndi iti?

Zizindikiro: Mtengo wa chinthu, kuchuluka kwa chitsulo (+5% mtengo pa +1%), kuchuluka kwa zolakwika zosindikizira (-0.5 RMB/PCB pa -1%), nthawi yosungira (-3% mtengo wosungira pa +1 mwezi), kuwerengedwa ndi index yolemera.
39. Kodi mungachepetse bwanji zinyalala za mafunde pogwiritsa ntchito njira yokonza zinthu?

Njira: Kuteteza nayitrogeni (kumachepetsa zinyalala ndi 40%-60%), mafuta oletsa kusungunuka kwa okosijeni (kumachepetsa kuchuluka kwa kusungunuka kwa okosijeni ndi 50%-70%), kuwongolera kutentha ±2℃, kungathandize kuchepetsa zinyalala kuchokera pa 5kg/kits kufika pa 2-3kg/kits.
40. Kodi pali ubale wotani pakati pa kusintha kwa zinthu zomwe zagulitsidwa ndi kugulitsa zinthu m'makampani?

Kuwonjezeka kwa ndalama zomwe zagwiritsidwa ntchito kuyambira nthawi 4 mpaka 6 pachaka kumachepetsa ndalama zomwe zimagwiritsidwa ntchito ndi 33%. Kupititsa patsogolo magwiridwe antchito kudzera mu kugula zinthu za JIT, zinthu zomwe zasungidwa bwino (kuchepetsa 20%-30%), ndi kuchepetsa nthawi yogwirira ntchito (kuchepetsa masiku 15-20).
41. Ndi njira ziti zofunika zomwe ziyenera kuganiziridwa panthawi ya kafukufuku wa satifiketi ya ISO 9001 ya ogulitsa solder?

Kuyang'ana Kwambiri: Kuyang'anira zinthu zopangira (kuphimba 100%), kuwongolera kupanga (monga, nthawi yosakaniza phala la solder ≤5%), kuyesa zinthu zomalizidwa (≥zinthu 10 pa gulu lililonse), kusamalira zinthu kosatsatira nthawi (nthawi yake ≥95%).
42. Kodi mungawunikire bwanji luso la wopereka kafukufuku ndi chitukuko kudzera mu kafukufuku wa pamalopo?

Zizindikiro zowunikira: Zipangizo za kafukufuku ndi chitukuko (DSC, kupezeka kwa SEM), chiŵerengero cha ogwira ntchito za kafukufuku ndi chitukuko (≥15%), chiwerengero cha ma patent (≥3 atsopano pachaka), nthawi yopangira zinthu zatsopano (avereji ya ≤miyezi 6).
43. Kodi mungadziwe bwanji kuchuluka kwa ndalama zomwe zimaperekedwa kwa ogulitsa solder?

Chiŵerengero: 5%-10% ya ndalama zomwe zagulidwa pachaka. Kuchotsera pa chiwopsezo cha batch defect rate >3%, kubweza pambuyo pa ma batch atatu otsatizana kuti mulimbikitse kuwongolera khalidwe.
44. Ndi magawo ati ofunikira aukadaulo omwe ayenera kuphatikizidwa mu mgwirizano waukadaulo ndi ogulitsa solder?

Zikuphatikizapo: Kapangidwe ka aloyi (monga, kulekerera kwa SAC305 Sn±0.5%, Ag±0.2%, Cu±0.1%), malo osungunuka (217℃±3℃), kukhuthala (50-150Pa·s±10%), mulingo wa ntchito (monga, RA grade halide ≤0.5%), zofunikira pa chilengedwe (RoHS 2.0), ndi zina zotero.
45. Kodi mungasamalire bwanji chidziwitso cha gulu la solder pogwiritsa ntchito njira yotsatirira bwino?

Zolemba za dongosolo: Nambala ya gulu, tsiku lopanga, kapangidwe kake, nthawi yosungiramo zinthu, ndi zina zotero, zolumikizidwa ndi zizindikiro zapadera za PCBA. Nthawi ya malo amavuto yachepetsedwa kuchoka pa maola 24 kufika pa ≤2.
46. Kodi mitundu yosiyanasiyana ya solder paste squeegees imakhudza bwanji ubwino wa kusindikiza?

Chokokera cha polyurethane: Chosinthasintha, choyenera kukhuthala pang'ono komanso kukhuthala pang'ono (mapini
Chotsukira chachitsulo: Kuuma kwambiri, koyenera kugwiritsa ntchito mafilimu okhuthala kwambiri komanso okhuthala (mapepala okwana >0.8mm, kulekerera makulidwe ±5μm).
47. Kodi tingawunikire bwanji kuchuluka kwa momwe njira zoyendetsera solder zimagwirira ntchito?

Zizindikiro: Kuchuluka kwa katundu wogulitsidwa (mlingo wabwino kwambiri nthawi 8-10 pachaka), nthawi yochokera pakutenga katundu kupita pa mzere (≤ ola limodzi), chiŵerengero cha nthawi yopuma chifukwa cha mavuto oyang'anira (
48. Momwe mungathetsere mavuto potengera momwe zinthu zosonkhanitsira zimagwirira ntchito pamene kusweka kosakwanira (kusweka kosakwanira) kumachitika pambuyo pa PCBA welding?

Mfundo zothanirana ndi mavuto:

1. Yang'anani ngati chitsulo chosungunula chili ndi ≥90% (muyezo wopanda lead), kusowa kwake kumawonjezera chiopsezo chosakwanira cha soldering ndi 40%+.

2. Onetsetsani kuti ntchito ya flux ikukwaniritsa RA grade, kusagwira ntchito mokwanira kumabweretsa kusanyowa bwino;

3. Tsimikizirani ngati solder phala yatha ntchito (kukhuthala/kuwonongeka kwa ntchito).
49. Kodi mungasankhe bwanji zinthu zoyenera zosokera kuti zitsimikizidwe panthawi yopanga PCBA yoyeserera pang'ono?

Njira:

1. Ikani patsogolo chitsanzo chomwecho cha solder monga kupanga zinthu zambiri kuti muwonetsetse kuti njira ikupitilira;

2. Pazinthu zovuta, sankhani mitundu iwiri kapena itatu yomwe ili ndi magwiridwe ofanana kuti muyerekeze;

3. Yesani pogwiritsa ntchito chiwongola dzanja cha chilema, deta ya mphamvu yolumikizirana ndi solder, ndi mtengo wake wonse.
50. Kodi tingawunikire bwanji momwe malo osungira solder amakhudzira nthawi yake yosungiramo zinthu?

Zinthu zazikulu:

- Kukhalitsa kwa alumali kumafupikitsidwa ndi 20% pa kutentha kulikonse kwa 5℃ kuposa muyezo (monga, phala >10℃);

- Kuchuluka kwa okosijeni kumawonjezeka ndi 15% pa 10% iliyonse ya chinyezi cha RH;

Unikani kuyanjana kwa deta pogwiritsa ntchito zojambulira kutentha/chinyezi kuti mulosere nthawi yeniyeni yosungiramo zinthu.
51. Kodi mungadziwe bwanji ngati mungayikenso bafa yothira madzi panthawi yokonza thanki yothira madzi nthawi zonse?

Zofunikira zosinthira:

1. Zodetsa zimaposa muyezo (monga, Cu >0.8%, IPC-J-STD-006B), mphamvu ya solder joint imachepa ndi 20%-30%;

2. Zinyalala za solder zimaphimba pamwamba pa 20% ya malo osambira, zomwe zimakhudza ubwino wake;

3. Chiwopsezo cha kuotcherera chimawonjezeka nthawi zonse chifukwa cha mavuto a bafa losokera.
52. Kodi mungakonze bwanji mapulani ogulira pogwiritsa ntchito kusanthula kwakukulu kwa deta poyang'anira zinthu zosokera?

Njira:

1. Kusanthula momwe zinthu zinalili kale, nthawi yogulira zinthu, ndi kusinthasintha kwa mitengo kuti zidziwike kufunikira;

2. Kugulitsa zinthu pasadakhale kutengera zomwe zachitika nyengo iliyonse kuti muchepetse zoopsa zoti katundu atha;

3. Tsatirani momwe mitengo ikuyendera kuti muwongolere nthawi yogulira. Deta ikuwonetsa mtengo wa zinthu zomwe zili m'sitolo ndi kuchepetsa mtengo wa kugula ndi 8%-12%.
53. Kodi kugwiritsa ntchito mitundu yosiyanasiyana ya solder yokonzanso zinthu kumakhudza bwanji kudalirika kwa zinthu panthawi yokonzanso PCBA?

Zotsatira:

- Chosungunula chomwe chili ndi kapangidwe kameneka: Kugwira ntchito bwino kwa cholumikizira, kudalirika kofanana ndi koyambirira;

- Chosungunula chopangidwa mosiyanasiyana (monga chosungunula chotsika kutentha chochokera ku bismuth): Kusagwirizana kwakukulu kwa CTE (chochokera ku bismuth ≈2x SAC305), chomwe chimayamba kusweka nthawi ya kutentha, kudalirika kumachepetsedwa ndi 50%+.

Kusamalira zinthu zowotcherera

1. Kodi ma ratio a zigawo ndi ubwino wa magwiridwe antchito a solder wamba wopanda lead SAC305 ndi ati?

2. Kodi mfundo ya eutectic ya solder alloys imakhudza bwanji njira yowotcherera?

3. Kodi mungasiyanitse bwanji zochitika za kugwiritsa ntchito flux ndi magawo osiyanasiyana a ntchito?

4. Kodi miyezo ya kuchuluka kwa waya wothira ndi iti ndipo imakhudza bwanji kuwotcherera?

5. Kodi kufalikira kwa tinthu tating'onoting'ono ta ufa wachitsulo mu solder phala kumakhudza bwanji magwiridwe antchito osindikizira?

6. Kodi kutentha ndi chinyezi zomwe zimaloledwa kusinthasintha ndi ziti m'malo osungira zinthu zosungunulira?

7. Kodi nthawi yosungira waya wosatsegulidwa ndi yotani?

8. N’chifukwa chiyani madzi otuluka ayenera kusungidwa kutali ndi kuwala?

9. N’chifukwa chiyani kusakaniza sikuloledwa panthawi yobwezeretsa kutentha kwa solder phala yotengedwa kuchokera ku malo ozizira?

10. Kodi nthawi yowerengera kutentha ndi chinyezi m'malo osungira solder ndi yotani?

11. Kodi nthawi yochuluka yogwiritsira ntchito phala lotseguka la solder pa makina osindikizira ndi iti?

12. Kodi mungadziwe bwanji momwe solder liquid imasinthira mu thanki yosungunula mafunde?

13. Kodi pali ubale wotani pakati pa kugwiritsidwa ntchito kwa waya wothira ndi kukula kwa cholumikizira cha solder pakuwotcherera kosankha?

14. Kodi kuphatikiza kwabwino kwambiri kwa kutentha kwa nsonga ya chitsulo chosungunula ndi nthawi yosungunula powotcherera ndi manja ndi kotani?

15. Kodi ngodya ya squeegee imakhudza bwanji khalidwe la kusindikiza panthawi yosindikiza solder paste?

16. Kodi mungazindikire bwanji malo opanda kanthu mkati mwa malo olumikizirana pogwiritsa ntchito X-Ray?

17. Kodi mikhalidwe yokhazikika ndi mitundu yovomerezeka ya kupotoka poyesa kukhuthala kwa solder paste ndi iti?

18. Kodi njira zoyesera mphamvu yokoka ndi ziti zomwe zimagwiritsidwa ntchito poyesa malo olumikizirana ndi solder?

19. Kodi tingayang'ane bwanji kapangidwe kake ka ma solder joints pogwiritsa ntchito metallographic sectioning?

20. Kodi muyezo woyesera kuyera kwa ayoni pa zotsalira za flux ndi wotani?

21. Kodi kutentha kwa kutentha mu gawo lokonzekera kutentha kwa soldering kumakhudza bwanji kuwotcherera?

22. Mu ndondomeko yosokera mafunde awiri, kodi ntchito ndi makonda a mafunde akutsogolo ndi akumbuyo ndi otani?

23. Kodi mungachepetse bwanji kugwa kwa solder phala mwa kukonza kapangidwe ka stencil?

24. Kodi chitetezo cha nayitrogeni chimakhudza bwanji ubwino wa kuwotcherera pakuwotcherera kosankha?

25. Kodi mungasinthe bwanji kuchuluka kwa kuzizira kwa soldering malinga ndi makulidwe a PCB?

26. Kodi mfundo yofananira pakati pa liwiro la kuchotsera makina osindikizira ndi kukhuthala kwa solder paste ndi iti?

27. Kodi pali ubale wotani pakati pa kuchuluka kwa malo otentha osinthira kutentha ndi kuwotcherera kwa bolodi la circuit board?

28. Kodi chipangizo chosakaniza mu thanki yosungunula mafunde chimakhudza bwanji kufanana kwa madzi osungunula?

29. Kodi kulondola kwa kuchuluka kwa tin spray ya nozzle yosankha yolumikizira zinthu pa malo olumikizirana ang'onoang'ono olumikizira zinthu kumakhudza bwanji?

30. Kodi mphamvu yolamulira mphamvu ya makina odyetsera waya wothira magetsi ndi yotani?

31. Kodi njira yokhazikika komanso njira zodzitetezera pokonzanso solder yopanda lead ndi ziti?

32. Kodi zigawo zazikulu za mpweya wosasunthika womwe umatuluka ndi ziti komanso malire ake owonekera pantchito?

33. Kodi malamulo okhudza kugawa zinyalala zoopsa ndi zofunikira pa zinthu zosungunulira zinyalala ndi ziti?

34. Kodi zofunikira za kalasi yosaphulika m'malo osungiramo zinthu zotayidwa ndi ziti?

35. Kodi mungapewe bwanji kusungunuka kwa zinyalala za solder panthawi yosungira?

36. Kodi mungachepetse bwanji ndalama pokonza makulidwe a kusindikiza kwa solder phala?

37. Kodi kuchuluka kwa kutayika kwa waya wosokera ndi njira zochepetsera ndi kotani m'makampani?

38. Kodi njira yowerengera mtengo ndi magwiridwe antchito a ma solder phala ochokera ku mitundu yosiyanasiyana ndi iti?

39. Kodi mungachepetse bwanji zinyalala za mafunde pogwiritsa ntchito njira yokonza zinthu?

40. Kodi pali ubale wotani pakati pa kusintha kwa zinthu zomwe zagulitsidwa ndi kugulitsa zinthu m'makampani?

41. Ndi njira ziti zofunika zomwe ziyenera kuganiziridwa panthawi ya kafukufuku wa satifiketi ya ISO 9001 ya ogulitsa solder?

42. Kodi mungawunikire bwanji luso la wopereka kafukufuku ndi chitukuko kudzera mu kafukufuku wa pamalopo?

43. Kodi mungadziwe bwanji kuchuluka kwa ndalama zomwe zimaperekedwa kwa ogulitsa solder?

44. Ndi magawo ati ofunikira aukadaulo omwe ayenera kuphatikizidwa mu mgwirizano waukadaulo ndi ogulitsa solder?

45. Kodi mungasamalire bwanji chidziwitso cha gulu la solder pogwiritsa ntchito njira yotsatirira bwino?

46. ​​Kodi mitundu yosiyanasiyana ya solder paste squeegees imakhudza bwanji ubwino wa kusindikiza?

47. Kodi tingawunikire bwanji kuchuluka kwa momwe njira zoyendetsera solder zimagwirira ntchito?

48. Momwe mungathetsere mavuto potengera momwe zinthu zosonkhanitsira zimagwirira ntchito pamene kusweka kosakwanira (kusweka kosakwanira) kumachitika pambuyo pa PCBA welding?

49. Kodi mungasankhe bwanji zinthu zoyenera zosokera kuti zitsimikizidwe panthawi yopanga PCBA yoyeserera pang'ono?

50. Kodi tingawunikire bwanji momwe malo osungira solder amakhudzira nthawi yake yosungiramo zinthu?

51. Kodi mungadziwe bwanji ngati mungayikenso bafa yothira madzi panthawi yokonza thanki yothira madzi nthawi zonse?

52. Kodi mungakonze bwanji mapulani ogulira pogwiritsa ntchito kusanthula kwakukulu kwa deta poyang'anira zinthu zosokera?

53. Kodi kugwiritsa ntchito mitundu yosiyanasiyana ya solder yokonzanso zinthu kumakhudza bwanji kudalirika kwa zinthu panthawi yokonzanso PCBA?

46. Kodi mitundu yosiyanasiyana ya solder paste squeegees imakhudza bwanji ubwino wa kusindikiza?