Lapho uxhuma insimbi ku-aluminium, ukusabela phakathi kwama-athomu e-Fe kanye ne-Al phakathi nenqubo yokuxhuma kwenza ama-brittle intermetallic compounds (IMCs). Ukuba khona kwalawa ma-IMC kukhawulela amandla emishini yokuxhuma, ngakho-ke kuyadingeka ukulawula inani lalezi zinhlanganisela. Isizathu sokwakhiwa kwama-IMC ukuthi ukuncibilika kwe-Fe ku-Al kubi. Uma idlula inani elithile, ingase ithinte izakhiwo zemishini ye-weld. Ama-IMC anezinto ezihlukile ezinjengokuqina, ukudumba okulinganiselwe nokuqina, nezici ze-morphological. Ucwaningo luthole ukuthi uma kuqhathaniswa namanye ama-IMC, isendlalelo se-Fe2Al5 IMC sibhekwa kabanzi njenge-brittle kakhulu (11.8)± 1.8 GPa) isigaba se-IMC, futhi futhi iyisizathu esiyinhloko sokuncipha kwezakhiwo zemishini ngenxa yokwehluleka kokushisela. Leli phepha liphenya inqubo yokushisela i-laser yerimothi ye-IF steel ne-aluminium engu-1050 kusetshenziswa i-laser yemodi yokukhala elungisekayo, futhi liphenya ngokujula komthelela wokuma kwe-laser beam ekwakhekeni kwezinhlanganisela ze-intermetallic kanye nezakhiwo zemishini. Ngokulungisa isilinganiso samandla amaphakathi/endandatho, kutholwe ukuthi ngaphansi kwemodi yokuqhuba, isilinganiso samandla amaphakathi/sendandatho esingu-0.2 singafinyelela indawo engcono yokuhlanganisa i-weld interface futhi sinciphise kakhulu ukujiya kwe-Fe2Al5 IMC, ngaleyo ndlela kuthuthukise amandla okugunda okuhlangene. .
Lesi sihloko sethula umthelela we-laser yemodi eyindandatho elungisekayo ekwakhekeni kwezinhlanganisela ze-intermetallic kanye nezakhiwo zomshini ngesikhathi sokushiselwa kwe-laser okukude kwensimbi ye-IF kanye ne-aluminium engu-1050. Imiphumela yocwaningo ikhombisa ukuthi ngaphansi kwemodi yokuqhuba, isilinganiso samandla ayisisekelo/ esiyindandatho esingu-0.2 sinikeza indawo enkulu ye-weld interface bonding surface, eboniswa ngamandla amakhulu okushear angu-97.6 N/mm2 (ukusebenza ngokuhlanganyela okungu-71%). Ngaphezu kwalokho, uma kuqhathaniswa nemishayo ye-Gaussian enesilinganiso samandla esikhulu kuno-1, lokhu kunciphisa kakhulu ukujiya kwe-Fe2Al5 intermetallic compound (IMC) ngo-62% kanye nobukhulu be-IMC obuphelele ngo-40%. Kumodi ye-perforation, ukuqhekeka namandla okugunda okuphansi kwabonwa uma kuqhathaniswa nemodi yokuqhuba. Kuyaphawuleka ukuthi ukucolisiswa okubalulekile okusanhlamvu kwabonwa kumthungo wokushisela lapho isilinganiso samandla amaphakathi/endandatho sasingu-0.5.
Uma u-r=0, kukhiqizwa amandla e-loop kuphela, kuyilapho u-r=1, kukhiqizwa amandla ayinhloko kuphela.
Umdwebo wohlelo wesilinganiso samandla r phakathi kwe-Gaussian beam ne-annular beam
(a) Umshini wokushisela; (b) Ukujula nobubanzi bephrofayili yokushisela; (c) Umdwebo wohlelo lokubonisa izilungiselelo zesampula nesakhiwo
Ukuhlolwa kwe-MC: Kuphela esimweni se-Gaussian beam, i-weld seam ekuqaleni iba kumodi yokuqhuba engashoni (ID 1 kanye no-2), bese ishintshela kumodi yokukhiya engena kancane (ID 3-5), bese kuvela imifantu esobala. Lapho amandla endandatho ekhuphuka esuka ku-0 aye ku-1000 W, kwakungekho mifantu esobala ku-ID 7 futhi ukujula kokunothisa kwensimbi kwakukuncane uma kuqhathaniswa. Lapho amandla endandatho enyuka aze afike ku-2000 no-2500 W (ID 9 no-10), ukujula kwendawo yensimbi ecebile kuyanda. Ukuqhekeka okweqile kumandla endandatho angu-2500w (ID 10).
Ukuhlolwa kwe-MR: Uma amandla ayisisekelo ephakathi kuka-500 no-1000 W (ID 11 kanye no-12), i-weld seam ikumodi yokuqhuba; Ukuqhathanisa i-ID 12 ne-ID 7, nakuba amandla aphelele (6000w) afana, i-ID 7 isebenzisa imodi yembobo yokukhiya. Lokhu kungenxa yokwehla okuphawulekayo kokuminyana kwamandla ku-ID 12 ngenxa yesici esivelele se-loop (r=0.2). Uma amandla aphelele afinyelela ku-7500 W (ID 15), imodi yokungena egcwele ingafinyelelwa, futhi uma kuqhathaniswa ne-6000 W esetshenziswe ku-ID 7, amandla emodi yokungena egcwele akhuphuka kakhulu.
Ukuhlolwa kwe-IC: Imodi eyenziwe (ID 16 kanye ne-17) ifinyelelwe ngamandla angu-1500w ayinhloko kanye namandla angu-3000w kanye nama-3500w. Uma amandla ayisisekelo engu-3000w futhi amandla endandatho ephakathi kuka-1500w no-2500w (ID 19-20), ukuqhekeka okusobala kubonakala kusixhumi esibonakalayo phakathi kwensimbi ecebile ne-aluminium ecebile, okwenza iphethini yembobo encane engena endaweni. Uma amandla endandatho engu-3000 no-3500w (ID 21 kanye no-22), finyelela imodi yokhiye wokungena ogcwele.
Izithombe ezimele izingxenye ezihlukene zesibonakaliso ngasinye sokushisela ngaphansi kwesibonakhulu esibonakalayo
Umfanekiso 4. (a) Ubudlelwano phakathi kwamandla okugcina amandla (i-UTS) kanye nesilinganiso samandla ekuhlolweni kokushisela; (b) Amandla aphelele azo zonke izivivinyo zokushisela
Umfanekiso 5. (a) Ubudlelwano phakathi kwe-aspect ratio ne-UTS; (b) Ubudlelwano phakathi kwesandiso nokujula kokungena kanye ne-UTS; (c) Ukuminyana kwamandla kuzo zonke izivivinyo zokushisela
Umfanekiso 6. (ac) Vickers microhardness indentation map; (df) I-SEM-EDS chemical spectra ehambisanayo yokushisela okumele imodi yokuqhuba; (g) Umdwebo owuhlelo wokuxhumana phakathi kwensimbi ne-aluminium; (h) I-Fe2Al5 kanye nobukhulu obuphelele be-IMC bokushisela kwemodi yokuqhuba
Umfanekiso 7. (ac) Vickers microhardness indentation map; (df) I-SEM-EDS i-spectrum yamakhemikhali ehambisanayo yokushisela okumele indawo yokungena kwe-perforation
Umfanekiso 8. (ac) Vickers microhardness indentation map; (df) I-SEM-EDS chemical spectrum ehambisanayo yokushisela okumele okugcwele kwemodi yokungena
Umfanekiso 9. Isakhiwo se-EBSD sibonisa usayizi wokusanhlamvu wendawo ecebile yensimbi (ipuleti eliphezulu) ekuhlolweni okugcwele kwemodi yokubhoboza yokungena, futhi ilinganisela ukusatshalaliswa kosayizi wokusanhlamvu.
Umfanekiso 10. Umbono we-SEM-EDS wesixhumi esibonakalayo phakathi kwensimbi ecebile ne-aluminium ecebile
Lolu cwaningo luphenye imiphumela yelaser ye-ARM ekwakhekeni, ukwakheka kwe-microstructure, kanye nezakhiwo zemishini ze-IMC ku-IF steel-1050 aluminium alloy alloy dissimilar lap welded joints. Ucwaningo lucubungule izindlela ezintathu zokushisela (imodi yokuqhuba, imodi yokungena yendawo, nemodi yokungena egcwele) kanye nezimo ezintathu ezikhethiwe ze-laser beam (ugongolo lwe-Gaussian, i-annular beam, ne-Gaussian annular beam). Imiphumela yocwaningo ibonisa ukuthi ukukhetha isilinganiso esifanele samandla se-Gaussian beam kanye ne-annular beam kuyipharamitha ebalulekile yokulawula ukwakheka kanye ne-microstructure yekhabhoni ye-modal yangaphakathi, ngaleyo ndlela kukhulisa izakhiwo zemishini ye-weld. Kumodi yokuqhuba, ugongolo oluyisiyingi olunesilinganiso samandla esingu-0.2 lunikeza amandla angcono kakhulu okushisela (71% ukusebenza kahle okuhlangene). Kumodi yokubhoboza, ugongolo lwe-Gaussian lukhiqiza ukujula okukhulu kwe-welding kanye ne-aspect ratio ephakeme, kodwa ukuqina kokushisela kuyancipha kakhulu. I-annular beam enesilinganiso samandla esingu-0.5 sinomthelela omkhulu ekucwengisisweni kwezinhlamvu zensimbi eziseceleni kwe-weld seam. Lokhu kungenxa yezinga lokushisa eliphakeme eliphansi le-annular beam eliholela esilinganisweni sokupholisa esisheshayo, kanye nomphumela okhawulelwe wokukhula wokufuduka kwe-Al solute ukuya engxenyeni engenhla ye-weld seam esakhiweni sokusanhlamvu. Kukhona ukuhlobana okuqinile phakathi kwe-Vickers microhardness kanye nokuqagela kwe-Thermo Calc kwephesenti levolumu yesigaba. Ubukhulu bephesenti yevolumu ye-Fe4Al13, bukhuphula ubulukhuni obuncane.
Isikhathi sokuthumela: Jan-25-2024
