Insimbi engaphekiwe isetshenziswa kakhulu ekwakhiweni kwezimoto, izinto zikagesi zasendlini, amakhabethe okugcina amandla, ama-switchgear, kanye nezibiyelo zensimbi ngenxa yokumelana nokugqwala okuhle kakhulu kanye nokubumbeka okuhle. Nokho, uma kuziwa ukumelanaukushisela indawo, insimbi ebilisiwe yaziwa nangokuthi enye yezinto eziyinselele kakhulu ukushisela njalo.
Izinkinga ezijwayelekile ezifana ne-spatter eningi, ama-weld nuggets angazinzile, i-porosity, ukunamathela kwe-electrode, nempilo emfushane yama-electrode kuvame ukuvela emigqeni yokukhiqiza. Abashiseli bendawo be-AC bendabuko bavame ukuthwala kanzima ukulinganisa amandla e-weld nokuzinza ngaphansi kwalezi zimo. Uma kuqhathaniswa, i-MFDC (Medium Frequency DC) indawo yokushisela isiphenduke isixazululo esithandwayo sokushisela insimbi ngenxa yokulawula kwayo kwamanje kanye nokusebenza kahle kwamandla.
Ukuze uthole ukushisela okuzinzile, okuphezulu{0}}okuphezulu, kanye{1}}nokuphansi kwe-spatter kunsimbi yama-galvanized, akwanele ukuthembela ezintweni zokusebenza kuphela. Ukuqonda okuphelele kokuziphatha kwezinto ezibonakalayo, isu lepharamitha yokushisela, kanye nokumiswa kwenqubo kubalulekile.
Kungani Kunzima Insimbi Yensimbi Ukubona I-Weld?
Ubunzima bokushisela bensimbi ethathiwe ikakhulukazi buvela ezicini ezingokomzimba ze-zinc enamathela. Lezi zinto ezine zichaza amaphutha amaningi e-weld abonakala ekukhiqizeni:
- Iphuzu eliphansi lokubilisa le-zinc
I-Zinc ihwamuka cishe ku-907 degree, kuyilapho insimbi incibilika ngaphezu kwe-1450 degree. Ngesikhathi sokushisela, i-zinc ihwamuka kakhulu ngaphambi kokuba insimbi incibilike. Uma umhwamuko we-zinc ungakwazi ukuphunyuka ngokushelela, udala i-spatter enobudlova kanye ne-porosity yangaphakathi.
- High conductivity ezishisayo kanye ongaphakeme kagesi ukumelana ungqimba zinc
I-zinc coating isakaza ukushisa kude nendawo yokushisela, okwenza kube nzima ukugxilisa amandla endaweni efaying. Lokhu kuvame ukuholela kuma-weld nuggets abuthakathaka noma angahambisani.
- Ukupholisa okusheshayo kwe-weld nugget
I-Zinc isheshisa ukunqanyulwa kokushisa, okwenza i-nugget iqine ngaphambi kokukhula ngokugcwele, okunciphisa amandla omshini.
- Ukungcoliswa okukhulu kwama-electrode
Umhwamuko we-zinc unamathela kalula ichopho le-electrode, ubangele ukuguquguquka kwamanje okungazinzile, ukunamathela kwe-electrode, nokugqoka njalo. Emafekthri amaningi, ukuphila kwe-electrode kungafinyezwa ngo-40-60% lapho kushiselwa izinto ezisetshenziswayo.
Ngaphandle kokulawulwa okufanele kwenqubo, izinga lokungasebenzi kahle lokushisela indawo yensimbi ethathiwe lingafinyelela kalula ku-8%–15%, kukhinyabeze kakhulu ukukhiqiza nokuthembeka komkhiqizo.
KunganiI-MFDC Spot WeldersYenza Kangcono Ngensimbi Enguthayela (Ukuqhathaniswa Kwedatha)
Isizathu sokuthi abashiseli bendawo be-MFDC basebenze kangcono kunabashiseli be-AC bendabuko ilele kweyabookukhiphayo-okuphezulu, akukho uziro wamanje-ukuwela, kanye nokulawula kwamanje okunembe kakhulu. Izinzuzo ziba sobala kakhulu uma ziqhathaniswa nezinhlangothi:
| Into |
I-AC Spot Welder |
I-MFDC Spot Welder | Umthelela ku-Galvanized Steel |
| Ukuvama kokuphumayo
|
50/60 Hz | 800–2000 Hz | Imvamisa ephezulu=ukushisisa okuqhubekayo |
| I-waveform yamanje
|
Sine wave | Eduze{0}}i-square wave | Ukwakheka kwe-nugget okuzinzile |
| Ukuwela iqanda
|
Kusobala | Cishe akukho | Iqeda ukuphazamiseka kokushisa |
| Ukusebenza kahle kokushisa
|
Phansi | 15-25% ngaphezulu | Ukulahlekelwa ukushisa okuncane nge-zinc |
| Ukunemba kokulawula kwamanje
|
±8–10% | ±1–2% | Ukuvumelana okungcono kakhulu |
| Ukulawula i-spatter
|
Isilinganiso | I-spatter engaphansi ngo-30-50%.
|
Ukubukeka kwe-weld ehlanzekile |
| Ukuhambisana okuzenzakalelayo
|
Inomkhawulo | Kuhle kakhulu | Ilungele i-EV nemigqa yokukhiqiza yebhethri |
Kafushane:
Inhlanganisela yefrikhwensi ephezulu, imanje eqhubekayo, kanye nokulawula okunembile kuvumela i-MFDC spot welder ukuthi ixazulule ngokuqondile amaphuzu amathathu ezinhlungu ezinkulu zokushisela insimbi{0}}i-spatter, ama-nuggets abuthakathaka, nokungaguquguquki okubi.
I-Core Logic ye-Welding Parameters: "Ukususwa kwe-Zinc - I-Nugget Formation - Solidification"
Iphutha elivamile emafekthri amaningi ukumane ukwandise i-welding current lapho izinga lokushisela lensimbi liphansi. Eqinisweni, lokhu kuvame ukuholela ekutheni kube ne-spatter esindayo, ukugqoka ama-electrode okusheshayo, kanye nokungaguquguquki okubi nakakhulu. Inkinga yangempela akuwona amandla aphelele ngokwawo, kodwa ukuthi lawo mandla akhululwa kanjani ngokuhamba kwesikhathi.
Inqubo yokushisela esebenza ngempumelelo ye-galvanized steel ilandela-izigaba ezintathu ze-thermal logic:
Isigaba sokuqala - Ukulawulwa kwe-zinc vaporization
Ukufakwa kokushisa okumaphakathi kuhlanganiswe namandla afanele e-electrode kuvumela ungqimba lwezinc ukuthi luhwamuke futhi luphume ngendlela elawulwayo.
Isiteji esimaphakathi - Ukwakheka kwe-nugget yensimbi esheshayo
Amandla agxilile akha i-nugget encibilikisiwe ezinzile kusisekelo sensimbi.
Isigaba sokugcina - Isikhathi esanele sokubamba sokuqinisa
Ingcindezi yokubamba eyandisiwe iqinisekisa ukwakheka kwama-nugget aminyene ngesikhathi sokupholisa.
Ngobukhulu obujwayelekile beshidi elinothayela obungu-0.5–1.5 mm, ukulungiswa okunconyiwe uma kuqhathaniswa nensimbi emnene kuvame:
- I-welding current yehliswe ngo-20–30%
- Isikhathi sokushisela sifinyezwe ngo-10–20%
- Isikhathi sokubamba sikhuphuke ngo-15–25%
Okubaluleke ngokufanayo isimo esingaphezulu. Amashidi anamafutha, ama-oxidized coatings, noma ama-electrode angcoliswe kakhulu angakwazi ukuphika ngokuphelele izilungiselelo ezilungile zepharamitha.
-Ukuzinza Kwenqubo Yesikhathi Eside Kuncike Ekuphathweni Okumisiwe Kwe-Welding
Ngisho nemishini yokushisela indawo ye-MFDC, izimboni eziningi zisabhekana nokuguquguquka kwekhwalithi phakathi kwamashifu noma amaqoqo okukhiqiza. Ezimweni eziningi, umnyombo awukona amandla emishini, kodwa ukuntuleka kokumiswa kwenqubo kwangempela.
- Okokuqala, amapharamitha wokushisela kufanele asuke kokuthi "isipiliyoni somsebenzisi" aye kumafasitela enqubo engaguquki. Ubukhulu beshidi obuhlukene nezinhlobo zokumboza i-zinc zidinga ububanzi bepharamitha echazwe ngokucacile okungafanele ilungiswe ngokukhululeka.
- Okwesibili, ama-electrode kufanele aphathwe njengento esebenzisekayo ngesu-lomjikelezo wempilo kunokuba ashintshwe kuphela ngemva kokwehluleka. Ukungcoliswa okuqhubekayo nokugqoka kwehlisa kancane ikhwalithi yokushisela kudala ngaphambi kokuba ama-electrode abonakale "alimele."
- Okokugcina, -ukuhlola ucezu lokuqala kanye{1}}nokuqapha kwenqubo kwenza ukuzivikela okuphumelelayo ngokumelene nokwehluleka kwenqwaba. Ukuhlolwa kokudonsa, ukuhlolwa kosayizi we-nugget, kanye nokulawula kwe-SPC kusiza ekutholeni ukukhukhuleka kumapharamitha, isimo se-electrode, noma i-coating yento ngaphambi kokusabalala kwamaphutha.
Ekuphetheni:
Ukushisela indawo yensimbi eqinile akufinyelelwa ngomshini owodwa, kodwa ngohlelo oluphelele oluhlanganisa amapharamitha, ama-electrode, nokulawula ikhwalithi.
Isiphetho
Insimbi ephehliwe ibhekwa njengokunzima ukuyishisela ngoba i-zinc ihwamuka kusenesikhathi, isakaza ukushisa ngokushesha, inciphe iwindi lokwakheka kwe-nugget, futhi ingcolise ama-electrode ezingeni lokushisa eliphezulu. Lezi zici zenza izindlela zokushisela ezimahhadlahhadla, zendabuko zingazinzi ngokwemvelo.
I-MFDC spot welderidala iwindi lokushisela elilawulekayo ngokukhipha{0}}imvamisa ephezulu, i-DC ezinzile, kanye nokulawulwa kwamandla okunembile. Uma kuhlanganiswa nokulawulwa kwepharamitha yesayensi, ukuphathwa okufanele kwama-electrode, nezinqubo zokukhiqiza ezisezingeni, ukushisela indawo yensimbi enamagqabhagqabha kuyashintsha kusuka emthonjeni omkhulu onesici kube inqubo yokukhiqiza ezinzile, eyingozi kakhulu.
