Izimo ezidingekayo zei-PCB ehlanganisiweamabhodi wesifunda

1.I-weldment kumele ibe nokushisela okuhle

Okubizwa ngokuthi i-solderability ibhekisela ekusebenzeni kwe-alloy ukuthi impahla yensimbi okufanele ifakwe futhi i-solder ingakha inhlanganisela enhle ekushiseni okufanelekile. Akuzona zonke izinsimbi ezinokushisela okuhle. Ezinye izinsimbi, njenge-chromium, i-molybdenum, i-tungsten, njll., zinokushisela okubi kakhulu; ezinye izinsimbi, njengethusi, ithusi, njll., zinokushisela okungcono. Ngesikhathi sokushisela, izinga lokushisa eliphezulu libangela ukuba ifilimu ye-oxide yakheke phezu kwensimbi, okuthinta ukushisela kwezinto. Ukuze kuthuthukiswe i-solderability, i-surface tin plating, i-silver plating nezinye izinyathelo zingasetshenziswa ukuvimbela i-oxidation yendawo ebonakalayo.

2.Indawo yokushisela kufanele igcinwe ihlanzekile

Ukuze kuzuzwe inhlanganisela enhle ye-solder kanye ne-weldment, indawo yokushisa kufanele igcinwe ihlanzekile. Ngisho nama-weldments ane-weldability enhle, amafilimu e-oxide namabala kawoyela ayingozi ekumanziseni angase akhiqizwe ebusweni be-weldment ngenxa yokugcina noma ukungcola. Ifilimu yokungcola kufanele isuswe ngaphambi kokushisela, ngaphandle kwalokho ikhwalithi yokushisela ayikwazi ukuqinisekiswa. Izendlalelo ze-oxide ezimaphakathi ezindaweni zensimbi zingasuswa ngokushintshashintsha. Indawo yensimbi ene-oxidation eqinile kufanele isuswe ngezindlela zemishini noma zamakhemikhali, njengokukhuhla noma ukukha.

3.Sebenzisa i-flux efanele

Umsebenzi we-flux ukususa ifilimu ye-oxide ebusweni be-weldment. Izinqubo zokushisela ezihlukene zidinga ama-fluxes ahlukene, njenge-nickel-chromium alloy, insimbi engagqwali, i-aluminium nezinye izinto. Kunzima ukwenza i-solder ngaphandle kwe-flux ekhethekile ezinikezele. Lapho ushisela imikhiqizo ye-elekthronikhi enembile njengamabhodi wesekethe aphrintiwe, ukuze wenze ukushisela kuthembeke futhi kuzinzile, i-rosin-based flux ivame ukusetshenziswa. Ngokuvamile, utshwala busetshenziselwa ukuncibilikisa i-rosin emanzini e-rosin.

4. I-weldment kufanele ishiswe ekushiseni okufanelekile

Ngesikhathi sokushisela, umsebenzi wamandla ashisayo ukuncibilikisa i-solder nokushisa into yokushisela, ukuze ithini nama-athomu omthofu athole amandla anele ukuze angene ku-crystal lattice ebusweni bensimbi ezoshiswa ukuze yakhe ingxubevange. Uma izinga lokushisa le-welding liphansi kakhulu, liyoba yingozi ekungeneni kwama-athomu e-solder, okwenza kube nzima ukwenza i-alloy, futhi kulula ukwenza i-solder yamanga. Uma izinga lokushisa lokushisela liphezulu kakhulu, i-solder izoba sesimweni esingeyona i-eutectic, isheshisa ukubola kanye nezinga lokuguquguquka kwe-flux, okubangela ukuthi izinga le-solder liwohloke, futhi ezimweni ezinzima, Ingabangela amaphedi ephrintiwe. ibhodi lesifunda ukuze awe. Okufanele kugcizelelwe ukuthi akusiyo kuphela i-solder okumele ishiswe ukuze incibilike, kodwa i-weldment kufanele futhi ishise ekushiseni okungancibilikisa i-solder.

5. Isikhathi sokushisela esifanelekile

Isikhathi sokushisela sisho isikhathi esidingekayo sokushintsha ngokomzimba namakhemikhali phakathi nayo yonke inqubo yokushisela. Kuhlanganisa isikhathi sokuba insimbi ishiselwe ukuze ifinyelele izinga lokushisa lokushisela, isikhathi sokuncibilika kwe-solder, isikhathi sokusebenza kwe-flux kanye nesikhathi sokuba i-alloy yensimbi yakheke. Ngemuva kokuthi izinga lokushisa lokushisela selinqunyiwe, isikhathi esifanele sokushisela kufanele sinqunywe ngokusekelwe ekubunjweni, imvelo, nezici zezingxenye ezizoshiswa. Uma isikhathi se-welding side kakhulu, izingxenye noma izingxenye ze-welding zizolimala kalula; uma isikhathi sokushisela sisifushane kakhulu, izidingo zokushisela ngeke zifezwe. Ngokuvamile, isikhathi esiphezulu sokuba ijoyinti le-solder ngalinye lishiselwe asikho imizuzwana emi-5.