ʻElua mau kaʻina hana PCBA a me SMT, hoʻokahi kaʻina alakaʻi ʻole a ʻo kekahi kaʻina alakaʻi. Ua ʻike nā kānaka a pau he mea ʻino ke kēpau i ke kanaka. No laila, ʻo ke kaʻina hana alakaʻi ʻole e hoʻokō i nā koi o ka mālama ʻana i ke kaiapuni, he ʻano maʻamau a he koho hiki ʻole i ka mōʻaukala. . ʻAʻole mākou manaʻo he hiki i nā mea kanu hana PCBA ma lalo o ka pālākiō (ma lalo o 20 mau laina SMT) ke hiki ke ʻae i nā kauoha hoʻoponopono SMT alakaʻi ʻole a me ke alakaʻi ʻole, no ka mea, ʻo ka ʻokoʻa ma waena o nā mea waiwai, nā lako, a me nā kaʻina hana e hoʻonui nui i ke kumukūʻai a me ka paʻakikī. o ka hooponopono ana. ʻAʻole maopopo iaʻu ka maʻalahi o ka hana pololei ʻana i ke kaʻina alakaʻi ʻole.
Ma lalo iho nei, ua hōʻuluʻulu ʻia ka ʻokoʻa ma waena o ke kaʻina alakaʻi a me ke kaʻina alakaʻi ʻole e like me kēia. Aia kekahi mau hemahema, a ke manaʻo nei au e hiki iā ʻoe ke hoʻoponopono iaʻu.
1. 'Oko'a ka hui 'ana: 'o ke ka'ina alaka'i ma'amau he 63/37, a 'o ka hui 'ana o ke alaka'i 'ole he SAC 305, 'o ia ho'i, Sn: 96.5%, Ag: 3%, Cu: 0.5%. ʻAʻole hiki i ke kaʻina hana kepau ke hōʻoiaʻiʻo ʻaʻole loa ia i ke kēpau, aia wale nō ka haʻahaʻa haʻahaʻa o ke kēpau, e like me ke alakaʻi ma lalo o 500 PPM.
2. ʻO nā helu hoʻoheheʻe ʻokoʻa: ʻo ka helu hoʻoheheʻe o ke kēpau-tin he 180 ° ~ 185 °, a ʻo ka mahana hana ma kahi o 240 ° ~ 250 °. ʻO ka helu hoʻoheheʻe o ke kēpau ʻole he 210 ° ~ 235 °, a ʻo ka mahana hana he 245 ° ~ 280 °. Wahi a ka ʻike, no 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 okoa ke kumu kuai: ua oi aku ke kumukuai o ke tini ma mua o ke kepau. Ke hoʻololi ʻia ka solder like nui me ka tin, e piʻi nui ke kumukūʻai o ka solder. No laila, ʻoi aku ka kiʻekiʻe o ke kumukūʻai o ke kaʻina hana alakaʻi ma mua o ke kaʻina alakaʻi. Hōʻike nā helu ʻikepili i ka pahu tin no ka hoʻoheheʻe ʻana i ka nalu a me ka uea tin no ka soldering manual, ʻo ke kaʻina alakaʻi ʻole he 2.7 manawa kiʻekiʻe ma mua o ke kaʻina alakaʻi, a ʻo ka solder paste no ka reflow soldering Ua hoʻonui ʻia ke kumukūʻai ma kahi o 1.5 mau manawa.
4. Heʻokoʻa ke kaʻina hana: hiki keʻikeʻia ke kaʻina alakaʻi a me ke kaʻina alakaʻiʻole mai ka inoa. Akā, ʻokoʻa ka solder, nā ʻāpana, a me nā mea hana i hoʻohana ʻia, e like me nā kapuahi hoʻoheheʻe nalu, nā mea paʻi paʻi solder, a me nā hao hao no ke kūʻai lima lima. ʻO kēia hoʻi ke kumu nui e paʻakikī ai ka mālama ʻana i nā kaʻina alakaʻi a me ke alakaʻi ʻole i loko o kahi mea kanu PCBA liʻiliʻi.
ʻOkoʻa nā ʻokoʻa ʻē aʻe e like me ka puka makani kaʻina hana, solderability, a me nā koi palekana kaiapuni. ʻOi aku ka nui o ka puka aniani kaʻina 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 hana alakaʻi, a ke hoʻomau nei ka ʻenehana i ka hoʻomaikaʻi ʻana, ua lilo ka ʻenehana alakaʻi ʻole i ka hilinaʻi a me ka makua.