Kalubalen rarrauna ko "sanyi" welds{0}inda rashin isassun haɗakarwa ke haifar da rashin isasshen ƙarfin haɗin gwiwa{1}} ya kasance babban matsala wajen ƙirƙira aluminum. Kamar yadda masana'antu kamar kera motoci, na'urorin lantarki, da sararin samaniya ke ƙara dogaro da sifofin aluminum masu nauyi, tabbatar da amincin haɗin gwiwa yana da mahimmanci. Wannan jagorar tana ba da dabaru masu amfani, masana'antu{4}} don kawar da walda mai sanyi ta inganta nakuinji waldida sarrafa tsari.
Fahimtar Kalubalen: Me yasa Aluminum Spot Welds ya gaza
Don samun nasarar walda aluminum, dole ne mutum ya fara fahimtar ƙayyadaddun kaddarorin na zahiri waɗanda ke sa ya zama ƙalubale idan aka kwatanta da ƙarfe. "Cold weld" haɗin gwiwa ne wanda ke bayyana sautin tsari a saman ƙasa amma ya rasa haɗin da ake buƙata na ciki (samuwar nugget), yana haifar da rauni, haɗin da ba a dogara ba.
Ma'anar Cold Weld
Weld mai sanyi, sau da yawa ana kiranta da "ƙarya weld" ko "kwanciyar walƙiya," yana faruwa ne lokacin da zafin da ake samu yayin aikin waldawar tabo mai juriya bai isa ya haifar da narkakken narkakkar da ke tsakanin zanen karfe biyu ba. Wannan rashin haɗuwa yana nufin haɗin gwiwa yana dogara ne kawai akan matsa lamba na inji da haɗin kai na sama, wanda ke haifar da gazawar da wuri a ƙarƙashin damuwa.
Ka'idar Aiki na gazawa
Abubuwan farko na welds sanyi a cikin aluminum sun samo asali ne a cikin ilimin kimiyyar kayan aiki:
- 1.Insulating Oxide LayerAluminum a dabi'ance yana samar da sirara mai ƙarfi na aluminum oxide (Al₂O₃) akan samansa. Wannan oxide yana da wurin narkewa wanda ya wuce digiri 2,000 (digiri 3,632 F), wanda ya fi girma fiye da ma'aunin narkewar tushe na aluminum na kusan digiri 660 (digiri 1,220 F). Wannan Layer mai juriya yana aiki azaman insulator, yana hana waldawar halin yanzu gudana akai-akai kuma yana samar da ingantaccen zafi don haɗuwa.
- 2.Matsanancin Zafi: Aluminum yana alfahari da haɓakar wutar lantarki mai girma (sau huɗu na ƙarfe) da ƙarfin wutar lantarki mai girma (sau uku na ƙarfe). Zafin da aka samar a wurin sadarwa yana gudana da sauri daga yankin walda. Idan ba a isar da makamashin walda tare da ɗimbin yawa na yanzu da ɗan gajeren lokaci ba, zafi zai bace kafin narkakkar nut ɗin ta samu.
- 3.Sarrafa Matsalolin da ba daidai ba: Launuka na aluminum yana sa ya zama mai mahimmanci ga ƙarfin lantarki. Ƙarfi mai yawa yana rage juriyar lamba, yana haifar da rashin isasshen zafi. Ƙarfi kaɗan zai iya haifar da wuce gona da iri (fitarwa) da mannewar lantarki.
Magani: Inganta Injin Welding Spot don Aluminum
Kawar da welds sanyi yana buƙatar cikakkiyar hanya wacce ta fara da kayan aiki masu dacewa da daidaitaccen sarrafa tsari.
Amfanin Fasahar Matsakaicin Mitar DC (MFDC).
Domin ingancin walda tabo mai inganci na aluminum, ma'aunin masana'antu ya koma daga na'urar walda AC na gargajiya zuwa fasahar inverter na yanzu (MFDC). Abubuwan amfani suna da mahimmanci:
- Daidaitawa da Gudu: Tsarin MFDC yana aiki a manyan mitoci (yawanci 1,000 Hz zuwa 4,000 Hz), yana ba da damar lokacin amsawa na ƙasa da 0.5 milliseconds. Wannan saurin, daidaitaccen isar da makamashi yana da mahimmanci don shawo kan babban ƙarfin wutar lantarki na aluminum.
- Ingantaccen Makamashi: Fitowar DC tana rage hasara mai ƙima, yana sa tsarin ya zama mafi ƙarfi{0}} inganci da kwanciyar hankali idan aka kwatanta da tsarin AC.
- Weld Consistance: Mafi girman iko akan tsarin igiyar ruwa na yanzu yana tabbatar da daidaitaccen shigarwar zafi, wanda ke da mahimmanci don kiyaye ingancin nugget a cikin babban aikin samar da ƙarar{0}.
Madaidaicin Ma'aunin Sarrafa
Aluminum walda yana buƙatar sigogi waɗanda suka bambanta sosai da ƙarfe - yawanci sau 2 zuwa sau 3 na yanzu da kuma gajeriyar lokutan walda, kamar yadda aka ƙayyade ta ma'auni kamar AWS C1.1 da ISO 18595.
| Kaurin Abu (mm) | Ƙarfin Electrode (kN) | Welding Current (kA) | Lokacin Weld (Cycles/60Hz) | Diamita Nugget Nugget (mm) |
| 0.8 | 2.0 - 3.0 | 18 - 22 | 3 - 5 | 4.5 - 5.0 |
| 1.2 | 3.0 - 4.5 | 24 - 30 | 5 - 8 | 5.5 - 6.0 |
| 1.5 | 4.0 - 5.5 | 28 - 35 | 6 - 10 | 6.0 - 7.0 |
Mafi Kyawun Ayyuka: Aiwatar da jaddawalin walda mai yawa{0}. Za a iya amfani da bugun bugun farko na walda don karye ta cikin Layer oxide, sannan a biyo babban bugun bugun bugun jini don fusion, da bugun bugun zuciya{3}} don rage saurin sanyi da rage fashewa.
Muhimmanci Pre{0}Shiri saman saman Weld
Tsaftataccen fili ba shi da -. Ko da mafi ci-gaba tabo waldi inji ba zai iya rama ga matalauta yanayin yanayi.
- Injiniyan Tsaftace: Yi amfani da gogashin goga na bakin karfe ko tsarin abrasion mai sarrafa kansa don cire Layer oxide.
- Chemical Cleaning: Yi amfani da matsakaicin acid ko alkaline mafita don lalata sinadarai.
- Lokacin Hankali: Aluminum fara sake - oxidize nan da nan. Dole ne a yi walda a cikin sa'o'i 2 zuwa 8 na shirye-shiryen saman don tabbatar da daidaiton juriyar lamba.
Gudanar da Electrode da Kulawa
Na'urorin lantarki na jan karfe da aluminium a shirye suke a yanayin zafi mai zafi, suna haifar da gurɓataccen fuska da canza siffar (sanne).
- Siffar Electrode: Yi amfani da na'urori masu siffa - tare da radius na fuska na 50mm zuwa 100mm.
- Tufafin atomatik: Aiwatar da tsarin suturar lantarki mai sarrafa kansa. Ya kamata a yi ado da kayan lantarki da sauƙi bayan kowane 50 zuwa 100 welds don kiyaye daidaitaccen lissafi da aiki, tabbatar da aikin injin walda ɗin ku ya kasance mafi kyau.
Tabbatar da Inganci da Ci gaba da Ingantawa
Don tabbatar da inganci mai dorewa, aiwatar da ingantaccen tsarin tabbatarwa:
- Gwajin lalata: Gwajin kwasfa na yau da kullun suna da mahimmanci don tabbatar da diamita na walda ya dace da ƙaramin girman da ake buƙata.
- Gwaji mara lalacewa (NDT) ba {{0}: Don aikace-aikace masu mahimmanci, yi amfani da gwajin ultrasonic ko saka idanu mai ƙarfi don bincika lahani na ciki ba tare da lalata ɓangaren ba.
- Shigar da bayanaiYi amfani da tsarin IoT na Masana'antu (IIoT) don shiga cikin halin yanzu, ƙarfi, da madaidaicin lokaci don kowane weld, samar da cikakkiyar ganowa da sauƙaƙe ci gaba da haɓaka tsari.
Kammalawa
Kawar da welds masu sanyi a cikin aluminium na buƙatar sadaukar da kai ga daidaito a duk matakan tsari. Ta hanyar saka hannun jari a fasahar MFDC, bin tsauraran ƙa'idodin sigina, da kiyaye tsauraran saman da sarrafa wutar lantarki, masana'antun za su iya samun abin dogaro, ƙaƙƙarfan haɗin gwiwa mai ƙarfi{{1} waɗanda suka cika ko wuce ƙa'idodin masana'antu.
