Xa kudibanisa intsimbi kwi-aluminium, impendulo phakathi kwee-athomu ze-Fe kunye ne-Al ngexesha lenkqubo yokudibanisa yenza ii-brittle intermetallic compounds (IMCs). Ubukho bezi IMC buthintela amandla oomatshini onxibelelwano, ngoko ke kuyimfuneko ukulawula ubungakanani bezi compounds. Isizathu sokwenziwa kwee-IMC kukuba ukunyibilika kwe-Fe kwi-Al akusebenzi kakuhle. Ukuba kudlula isixa esithile, kunokuchaphazela iimpawu zoomatshini ze-weld. Ii-IMC zineempawu ezizodwa ezifana nobunzima, ukuguquguquka okuncinci kunye nokuqina, kunye neempawu zemo. Uphando lufumanise ukuba xa kuthelekiswa nezinye ii-IMC, umaleko we-Fe2Al5 IMC uthathwa njengowona ubuthathaka kakhulu (11.8).± 1.8 GPa) IMC phase, kwaye ikwasisizathu esiphambili sokwehla kweempawu zoomatshini ngenxa yokusilela kwe-welding. Eli phepha liphanda inkqubo ye-remote laser welding yentsimbi ye-IF kunye ne-1050 aluminium kusetyenziswa i-adjustable ring mode laser, kwaye liphanda nzulu impembelelo yesimo se-laser beam ekwakhiweni kwee-intermetallic compounds kunye neempawu zoomatshini. Ngokulungisa umlinganiselo wamandla e-core/ring, kufunyenwe ukuba phantsi kwe-conduction mode, umlinganiselo wamandla e-core/ring we-0.2 unokufezekisa indawo engcono yokudibanisa i-weld interface kwaye unciphise kakhulu ubukhulu be-Fe2Al5 IMC, ngaloo ndlela uphucula amandla e-shear ejoyintini.
Eli nqaku lizisa impembelelo yelaser yemo yeringi ehlengahlengiswayo ekwakhiweni kweekhompawundi ze-intermetallic kunye neempawu zoomatshini ngexesha lokuwelda kwe-laser ekude yentsimbi ye-IF kunye ne-aluminium eyi-1050. Iziphumo zophando zibonisa ukuba phantsi kwemo ye-conduction, umlinganiselo wamandla e-core/ring we-0.2 ubonelela ngendawo enkulu yokudibanisa i-weld interface, ebonakaliswa ngamandla aphezulu okucheba angama-97.6 N/mm2 (ukusebenza kakuhle kwe-joint ye-71%). Ukongeza, xa kuthelekiswa nemisebe yeGaussian enomlinganiselo wamandla angaphezu kwe-1, oku kunciphisa kakhulu ubukhulu be-Fe2Al5 intermetallic compound (IMC) ngama-62% kunye nobukhulu be-IMC iyonke ngama-40%. Kwimo ye-perforation, imifantu kunye namandla aphantsi okucheba kwabonwa xa kuthelekiswa nemo ye-conduction. Kubalulekile ukuqaphela ukuba ukucocwa okubalulekileyo kwengqolowa kwabonwa kumthungo we-weld xa umlinganiselo wamandla e-core/ring wawuyi-0.5.
Xa r=0, kuveliswa amandla oluphu kuphela, ngelixa xa r=1, kuveliswa amandla angundoqo kuphela.
Umzobo weskimu womlinganiselo wamandla r phakathi komqadi weGaussian kunye nomqadi we-annular
(a) Isixhobo sokuwelda; (b) Ubunzulu nobubanzi beprofayili yokuwelda; (c) Umzobo weskimu wokubonisa izicwangciso zesampulu kunye nezixhobo
Uvavanyo lwe-MC: Kuphela kwimeko yeGaussian beam, umthungo we-weld uqala kwimo yokuqhuba engaphantsi (ID 1 kunye no-2), uze emva koko utshintshele kwimo yokutshixa engene kancinci (ID 3-5), apho kuvela khona imingxunya ecacileyo. Xa amandla endandatho enyuka ukusuka kwi-0 ukuya kwi-1000 W, bekungekho mingxunya icacileyo kwi-ID 7 kwaye ubunzulu bokutyetyiswa kwesinyithi babubuncinci. Xa amandla endandatho enyuka ukuya kwi-2000 kunye ne-2500 W (IDs 9 kunye no-10), ubunzulu bendawo yesinyithi etyebileyo buyanda. Ukuqhekeka okugqithisileyo kumandla endandatho angama-2500w (ID 10).
Uvavanyo lwe-MR: Xa amandla angundoqo ephakathi kwe-500 kunye ne-1000 W (ID 11 kunye ne-12), umthungo we-weld ukwimo yokuqhuba; Ukuthelekisa i-ID 12 kunye ne-ID 7, nangona amandla ewonke (6000w) efanayo, i-ID 7 isebenzisa imo ye-lock hole. Oku kungenxa yokwehla okukhulu koxinano lwamandla kwi-ID 12 ngenxa yempawu ye-dominant loop (r=0.2). Xa amandla ewonke efikelela kwi-7500 W (ID 15), imo ye-full penetration inokufezekiswa, kwaye xa kuthelekiswa ne-6000 W esetyenzisiweyo kwi-ID 7, amandla emo ye-full penetration anda kakhulu.
Uvavanyo lwe-IC: Imo eqhutywayo (ID 16 kunye ne-17) ifikelelwe kumandla engundoqo angama-1500w kunye namandla endandatho angama-3000w kunye nama-3500w. Xa amandla engundoqo engama-3000w kwaye amandla endandatho ephakathi kwama-1500w kunye nama-2500w (ID 19-20), kuvela imingxunya ecacileyo kwindawo ephakathi kwesinyithi esityebileyo kunye ne-aluminium etyebileyo, zenze ipateni yomngxuma omncinci ongenayo kwindawo. Xa amandla endandatho engama-3000 kunye nama-3500w (ID 21 kunye nama-22), fumana imo yesitshixo sokungena esipheleleyo.
Imifanekiso emele amacandelo ahlukeneyo esibonakaliso ngasinye se-welding phantsi kwe-microscope ebonakalayo
Umfanekiso 4. (a) Ubudlelwane phakathi kwamandla okuqina koxinzelelo (UTS) kunye nomlinganiselo wamandla kwiimvavanyo zokudibanisa; (b) Amandla apheleleyo azo zonke iimvavanyo zokudibanisa
Umfanekiso 5. (a) Ubudlelwane phakathi komlinganiselo wembonakalo kunye ne-UTS; (b) Ubudlelwane phakathi kolwandiso kunye nobunzulu bokungena kunye ne-UTS; (c) Uxinano lwamandla kuzo zonke iimvavanyo zokuwelda
Umfanekiso 6. (ac) Imephu ye-contour ye-indentation ye-Vickers microhardness; (df) Ii-spectra zekhemikhali ze-SEM-EDS ezihambelanayo zokuwelda imo yokuqhuba; (g) Umzobo we-schematic womdibaniso phakathi kwentsimbi kunye ne-aluminium; (h) I-Fe2Al5 kunye nobukhulu be-IMC iyonke yee-welds zemo yokuqhuba
Umfanekiso 7. (ac) Imephu ye-contour ye-indentation ye-Vickers microhardness; (df) I-SEM-EDS chemical spectrum ehambelanayo yokudibanisa imo yokugqobhoza kokungena kwendawo
Umfanekiso 8. (ac) Imephu ye-contour ye-indentation ye-Vickers microhardness; (df) I-SEM-EDS chemical spectrum ehambelanayo yokuwelda i-full penetration perforation mode welding
Umfanekiso 9. Iploti ye-EBSD ibonisa ubungakanani bengqolowa yendawo etyebileyo yesinyithi (ipleyiti ephezulu) kuvavanyo lwendlela yokugqobhoza ngokupheleleyo, kwaye ilinganisa usasazo lobungakanani bengqolowa
Umfanekiso 10. Iispectra ze-SEM-EDS zomdibaniso phakathi kwesinyithi esityebileyo kunye ne-aluminium etyebileyo
Olu phononongo luphande ngemiphumo ye-laser ye-ARM ekubunjweni, kwisakhiwo esincinci, nakwiempawu zoomatshini ze-IMC kwi-IF steel-1050 aluminium alloy dissimilar lap welded joints. Olu phononongo luqwalasele iindlela ezintathu zokudibanisa (imo yokuqhuba, imo yokungena yendawo, kunye nemo yokungena epheleleyo) kunye neemilo ezintathu ze-laser beam ezikhethiweyo (iGaussian beam, i-annular beam, kunye neGaussian annular beam). Iziphumo zophando zibonisa ukuba ukukhetha umlinganiselo wamandla ofanelekileyo weGaussian beam kunye ne-annular beam yiparameter ephambili yokulawula ukwakheka kunye nesakhiwo esincinci sekhabhoni yangaphakathi ye-modal, ngaloo ndlela kwandisa iipropati zoomatshini ze-weld. Kwimo yokuqhuba, umqadi ojikelezayo onomlinganiselo wamandla we-0.2 ubonelela ngamandla angcono kakhulu e-welding (71% ukusebenza kakuhle kwejoyinti). Kwimo yokuvula, umqadi weGaussian uvelisa ubunzulu obukhulu be-welding kunye nomlinganiselo ophezulu we-aspect ratio, kodwa amandla e-welding ancitshiswa kakhulu. Umqadi we-annular onomlinganiselo wamandla we-0.5 unempembelelo ebalulekileyo ekuphuculeni iinkozo zecala lentsimbi kumthungo we-weld. Oku kungenxa yobushushu obuphantsi bencochoyi yomqadi we-annular okhokelela kwisantya sokupholisa esikhawulezayo, kunye nesiphumo sokuthintela ukukhula kokufuduka kwe-Al solute ukuya kwinxalenye ephezulu yomthungo we-weld kwisakhiwo sengqolowa. Kukho ulwalamano oluqinileyo phakathi kobunzima be-Vickers kunye nokuqikelelwa kwe-Thermo Calc yepesenti yevolumu yesigaba. Okukhona ipesenti yevolumu ye-Fe4Al13 inkulu, kokukhona ubunzima be-micro.
Ixesha leposi: Jan-25-2024
