Yawancin nau'ikan kayan samarwa ana amfani da su a sarrafa facin SMT. Tinnote shine mafi mahimmanci. Ingancin facin kwano zai shafi ingancin walda kai tsaye na sarrafa facin SMT. Zabi nau'ikan tinnuts daban-daban. Bari in gabatar da rarrabuwa gama gari na man manna a taƙaice:
Weld manna wani nau'i ne na ɓangaren litattafan almara don haɗa foda mai walda tare da manna mai kama da walda (rosin, diluent, stabilizer, da dai sauransu) tare da aikin welded. Dangane da nauyin nauyi, 80 ~ 90% sune ƙarfe gami. Dangane da girma, ƙarfe da solder sun kai kashi 50%.
Hoto na 3 Manna granules goma (SEM) (sama)
Hoto 4 Takamaiman zane na murfin foda na kwano (ƙasa)
The solder manna ne m da gwangwani foda barbashi. Yana ba da mafi dacewa da ɓacin rai da zafi don haɓaka watsa zafi zuwa yankin SMT da rage tashin hankali na ruwa akan walda. Abubuwa daban-daban suna nuna ayyuka daban-daban:
1. Rarraba bisa ga sinadaran gwangwani
1. Lead welding paste: ya ƙunshi manyan abubuwan da ke da illa ga muhalli da jikin ɗan adam, amma tasirin walda yana da kyau kuma farashin ba shi da yawa. Ana iya amfani da shi ga wasu samfuran lantarki waɗanda ba su da buƙatun kare muhalli.
2. Lead-free welded manna: Bangaren yana da alaƙa da muhalli kuma yana da ƙaramin lahani. Ana amfani da shi a cikin samfuran lantarki masu dacewa da muhalli. Tare da haɓaka buƙatun kare muhalli don kariyar muhalli, fasahar da ba ta da gubar a cikin masana'antar sarrafa SMT za ta zama wani yanayi.
2. Rarraba bisa ga ma'aunin narkewar kwano
Gabaɗaya magana, za a iya raba wurin narkewar gwangwani zuwa nau'i uku: babban zafin jiki, matsakaicin zafin jiki, da ƙananan zafin jiki.
Babban zafin jiki da aka saba amfani dashi shine SN-G-CU 305, 0307; matsakaicin zafin jiki yana da SN-BI-AG; ƙananan zafin jiki da aka fi amfani da SN-BI. A cikin sarrafa facin SMT, kuna buƙatar zaɓar bisa ga halaye daban-daban na samfur.
3. Raba bisa ga fineness na tin foda
Dangane da diamita na barbashi na foda, za a iya raba kullin tin zuwa ruwan hoda na 1, 2, 3, 4, 5, da 6, wanda 3, 4, da 5 ne aka fi amfani da su. Abubuwan da suka fi dacewa, foda tin yana buƙatar ƙarami, amma ƙarami foda, wanda ya dace da yankin oxidation na tin foda zai karu. Bugu da ƙari, foda na zagaye na zagaye zai taimaka inganta ingancin bugawa.
No. 3 Fan: Farashin yana da ƙarancin arha, galibi ana amfani dashi a cikin manyan hanyoyin SMT;
No. 4 Fan: Yawanci ana amfani dashi a cikin sarrafa m ƙafafu IC da kwakwalwan kwamfuta na SMT;
Fan 5: Ana amfani da shi sau da yawa don ainihin abubuwan waldawa, wayoyin hannu, allunan, da sauransu, da manyan buƙatu don buƙatu masu girma; mafi wahalar aiwatar da samfurin SMT patch, mafi mahimmancin zaɓi na manna sacotic. Taimaka inganta tsarin sarrafa facin SMT.
Lokacin aikawa: Juni-21-2023
