Zvikonzero zvekudonha kubva kune yakasvibira mafuta mukumiririra kutenderera kweye wedunhu bhodhi uye ndeapi matambudziko anozokonzerwa neakanyanya gobvu girini mafuta

Kazhinji, tinoona yakasvibirira pamusoro pefirimu pamusoro peiyo circuit board. Muchokwadi, iri ndiro redunhu bhodhi solder ramba inki. Iyo inodhindwa pane iyo pcb kunyanya kudzivirira kuwina, saka inonziwo solder kuramba ingi. Iyo yakajairika pcb solder inoramba inks ndeyakasvibira, bhuruu, chena, nhema, yero uye tsvuku, pamwe nemhando dzakasiyana dzemamwe mavara asingawanzo. Iyi diki yeingi inogona kuvhara isingatarisirwi makondakita kunze kwemapedhi, dzivisa kutenderera dunhu diki uye kuwedzera hupenyu hwebasa rePCB mukushandisa. Inowanzozodaidzwa kunzi Welding Weld kana anti Welding; Nekudaro, panguva yePBB yekugadzirisa, pane matambudziko mazhinji nguva nenguva, uye rimwe rematambudziko akajairika kudonha kwesodera kuramba mafuta akasvibira pane redunhu bhodhi. Ndeipi chikonzero chekudonha kweinki pabhodhi redunhu?

Pane zvikonzero zvitatu zvakakosha zvekudonha kwemafuta akasvibirira ekuramba nemwenje wedunhu bhodhi:

Imwe ndeyekuti kana uchidhinda inki paPCB, iyo yekudyira isati yaitwa munzvimbo. Semuenzaniso, kune mavara, guruva kana tsvina pamusoro pePCB, kana dzimwe nzvimbo dzakasanganiswa. Muchokwadi, iyo yakapusa nzira yekugadzirisa dambudziko iri kuita iyo pretreatment zvakare, asi edza kuchenesa mavara, tsvina kana oxide rukoko pamusoro pePCB;

Chikonzero chechipiri ndechekuti zvinogona kudaro nekuti bhodhi redunhu rakabikwa muchoto kwenguva pfupi kana kuti tembiricha haina kukwana, nekuti bhodhi redunhu rinofanira kubikwa panopisa kwazvo mushure mekudhinda inki ye thermosetting. Kana tembiricha yekubheka kana nguva isingakwani, simba reinki pabhodhi pamusoro rinenge risingakwani, uye pakupedzisira kushomeka kwesoder kwebhodhi redunhu kunodonha.

Chikonzero chechitatu idiki yemhando yeingi kana kupera kweingi. Zvese izvi zvikonzero zvinoita kuti inki iri padunhu bhodhi idonhe. Kugadzirisa dambudziko iri, isu tinogona chete kutsiva iyo inki mutengesi.

Iyo IPC chiyero cheiyo wedunhu bhodhi indasitiri haireve iyo yakasvibira oiri gobvu pachayo. Kazhinji, iyo yakasvibira mafuta gobvu pamutsara pamusoro inodzorwa pa10-35um; Kana iyo girini mafuta iri gobvu uye yakanyanyisa kukwirira kupfuura iyo pad, pachave nenjodzi mbiri dzakavanzika:

Imwe ndeyekuti ukobvu hweplate hunopfuura muyero. Ukobvu hwakasvibira hwemafuta hwakasvibira huchaendesa kune ukobvu hweplate hwakanyanya, izvo zvinonetsa kuisa kana kunyangwe hazvigone kushandiswa;

Chechipiri, iyo simbi mesh yakasungwa kumusoro nemafuta akasvibira panguva yeSMT, uye ukobvu hwesimbi yekunamatira yakadhindwa padhiza ibundu nebundu, izvo zviri nyore kukonzera pfupi dunhu pakati pembambo mushure mekudzosera soldering.