PCBA,ʻElua ʻano kaʻina hana ʻo SMT, ʻo ke kaʻina alakaʻi ʻole, ʻo ke kaʻina alakaʻi ʻē aʻe, ʻike mākou a pau he mea pōʻino ke alakaʻi i nā kānaka, no laila ke hoʻokō nei ke kaʻina alakaʻi ʻole i nā koi o ka mālama ʻana i ke kaiapuni, ʻo ia ke ʻano o ka manawa, ka inevitable koho o ka mōʻaukala.
Ma lalo iho nei, ua hōʻuluʻulu pōkole nā ʻokoʻa ma waena o ke kaʻina alakaʻi a me ke kaʻina alakaʻi ʻole penei.Inā ʻaʻole i pau ka ʻenehana honua SMT chip processing analysis, manaʻolana mākou hiki iā ʻoe ke hana hou aku i nā hoʻoponopono.
1. 'Oko'a ka haku mele 'ana: 63 / 37 o ka tin a me ke kepau ka mea ma'amau i ke ka'ina alaka'i, a'o ka sac 305 i loko o ke kaula kepau, 'o ia ho'i, SN: 96.5%, Ag: 3%, Cu: 0.5% .ʻAʻole hiki i ke kaʻina hana kepau ke hōʻoiaʻiʻo ʻaʻole loaʻa ke alakaʻi, aia wale nō ka haʻahaʻa haʻahaʻa o ke kēpau, e like me ke alakaʻi ma lalo o 500 ppm.
2. Heʻokoʻa nā helu hoʻoheheʻe: 180 ° a hiki i 185 ° ke kēpau pahu hoʻoheheʻe a me ka mahana hana ma kahi o 240 ° a 250 °.ʻO ka helu hoʻoheheʻe o ke kēpau ʻole he 210 ° a 235 ° a ʻo ka mahana hana ʻo 245 ° a 280 ° pakahi.Wahi a ka ʻike, ʻo kēlā me kēia 8% - 10% ka piʻi ʻana o ka ʻike tin, piʻi ka helu heheʻe ma kahi o 10 degere, a piʻi ka mahana hana ma 10-20 degere.
3. He ʻokoʻa ke kumu kūʻai: ʻoi aku ka pipiʻi o ke kēpau ma mua o ke kēpau, a ke hoʻololi ʻia ka solder like nui e alakaʻi i ke tin, piʻi nui ke kumukūʻai o ka solder.No laila, ʻoi aku ka kiʻekiʻe o ke kumukūʻai o ke kaʻina alakaʻi ma mua o ke kaʻina alakaʻi.Hōʻike nā ʻikepili i ke kumu kūʻai o ke kaʻina alakaʻi ʻole he 2.7 manawa kiʻekiʻe ma mua o ke kaʻina hana kepau, a ʻo ke kumukūʻai o ka solder paste no ka reflow soldering ma kahi o 1.5 mau manawa kiʻekiʻe ma mua o ke kaʻina alakaʻi.
4. Heʻokoʻa ke kaʻina hana: aia nā hana alakaʻi a me ke alakaʻiʻole, hiki keʻikeʻia mai ka inoa.Akā, kiko'ī i ke kaʻina hana, ʻo ia ka hoʻohana ʻana i ka solder, nā ʻāpana a me nā mea hana, e like me ka umu hoʻoheheʻe nalu, ka mīkini paʻi paʻi solder, ka hao hao no ka wili lima lima, a me nā mea ʻē aʻe. manuahi a alakaʻi i nā kaʻina hana PCBA liʻiliʻi.
ʻOkoʻa nā ʻokoʻa i nā ʻano ʻē aʻe, e like me ka puka aniani kaʻina, weldability a me nā koi palekana kaiapuni.ʻOi aku ka nui o ka puka aniani o ke kaʻina alakaʻi a ʻoi aku ka maikaʻi o ka solderability.Eia nō naʻe, no ka mea, ʻoi aku ka maikaʻi o ke kaʻina alakaʻi me ka mālama ʻana i ke kaiapuni, a me ka holomua mau o ka ʻenehana i kēlā me kēia manawa, ua lilo ka ʻenehana alakaʻi ʻole i ka hilinaʻi a me ka makua.
Ka manawa hoʻouna: Iulai-29-2020
