Thaum txuas hlau rau txhuas, cov tshuaj tiv thaiv ntawm Fe thiab Al atoms thaum lub sij hawm kev sib txuas txheej txheem tsim nkig intermetallic compounds (IMCs). Lub xub ntiag ntawm cov IMCs txwv cov neeg kho tshuab lub zog ntawm kev sib txuas, yog li nws yuav tsum tau tswj kom muaj nuj nqis ntawm cov khoom sib txuas. Yog vim li cas rau kev tsim ntawm IMCs yog qhov solubility ntawm Fe hauv Al tsis zoo. Yog tias nws tshaj ib qho nyiaj, nws yuav cuam tshuam rau cov khoom siv ntawm cov khoom siv vuam. IMCs muaj cov khoom tshwj xeeb xws li hardness, txwv ductility thiab toughness, thiab morphological nta. Kev tshawb fawb tau pom tias piv rau lwm yam IMCs, Fe2Al5 IMC txheej yog dav suav hais tias yog qhov nkig tshaj plaws (11.8± 1.8 GPa) IMC theem, thiab tseem yog qhov laj thawj tseem ceeb rau kev txo qis hauv cov khoom siv vim qhov vuam tsis ua haujlwm. Daim ntawv no tshawb xyuas cov txheej txheem laser welding tej thaj chaw deb ntawm IF steel thiab 1050 txhuas siv lub nplhaib adjustable hom laser, thiab tshawb xyuas qhov tob ntawm lub laser beam duab ntawm kev tsim ntawm intermetallic tebchaw thiab txhua yam khoom. Los ntawm kev kho cov tub ntxhais / lub nplhaib fais fab sib piv, nws tau pom tias nyob rau hauv kev coj ua hom, cov tub ntxhais / lub nplhaib fais fab sib piv ntawm 0.2 tuaj yeem ua tiav qhov sib txuas zoo sib txuas ntawm qhov chaw sib txuas thiab txo qhov tuab ntawm Fe2Al5 IMC, yog li txhim kho lub zog shear ntawm kev sib koom tes. .
Qhov tsab xov xwm no qhia txog kev cuam tshuam ntawm lub nplhaib adjustable hom laser ntawm kev tsim ntawm intermetallic tebchaw thiab txhua yam khoom thaum lub sij hawm tej thaj chaw deb laser vuam ntawm IF steel thiab 1050 txhuas. Cov txiaj ntsig kev tshawb fawb qhia tau hais tias nyob rau hauv kev coj ua hom, ib qho tseem ceeb / lub nplhaib fais fab sib piv ntawm 0.2 muab qhov loj dua qhov sib txuas ntawm qhov sib txuas ntawm qhov chaw, uas tau cuam tshuam los ntawm qhov siab tshaj plaws shear zog ntawm 97.6 N / mm2 (kev sib koom ua haujlwm ntawm 71%). Tsis tas li ntawd, piv rau Gaussian kab teeb nrog lub zog piv ntau dua 1, qhov no txo qhov tuab ntawm Fe2Al5 intermetallic compound (IMC) los ntawm 62% thiab tag nrho IMC thickness los ntawm 40%. Nyob rau hauv hom perforation, cov kab nrib pleb thiab qis shear zog raug soj ntsuam piv rau hom conduction. Nws yog ib qho tsim nyog sau cia tias qhov tseem ceeb ntawm cov nplej ua kom zoo dua qub tau pom nyob rau hauv cov vuam seam thaum lub zog ntawm cov tub ntxhais / lub nplhaib sib piv yog 0.5.
Thaum r = 0, tsuas yog lub voj voog lub zog tsim tawm, thaum thaum r = 1, tsuas yog lub zog tseem ceeb yog tsim.
Schematic daim duab ntawm lub zog piv r ntawm Gaussian beam thiab annular beam
(a) Welding device; (b) Qhov tob thiab dav ntawm qhov vuam profile; (c) Schematic daim duab qhia txog cov qauv thiab kev teeb tsa fixture
MC xeem: Tsuas yog nyob rau hauv cov ntaub ntawv ntawm Gaussian beam, lub weld seam yog pib nyob rau hauv ntiav conduction hom (ID 1 thiab 2), thiab ces hloov mus rau ib feem nkag mus rau hauv lockhole hom (ID 3-5), nrog pom tseeb tawg tshwm. Thaum lub nplhaib fais fab tau nce los ntawm 0 mus rau 1000 W, tsis muaj cov kab nrib pleb ntawm ID 7 thiab qhov tob ntawm hlau enrichment kuj me me. Thaum lub nplhaib fais fab nce mus rau 2000 thiab 2500 W (IDs 9 thiab 10), qhov tob ntawm thaj tsam hlau nplua nuj nce. Kev tawg ntau dhau ntawm 2500w lub nplhaib lub zog (ID 10).
MR xeem: Thaum lub zog tseem ceeb nyob nruab nrab ntawm 500 thiab 1000 W (ID 11 thiab 12), lub vuam seam yog nyob rau hauv hom conduction; Sib piv ID 12 thiab ID 7, txawm hais tias tag nrho lub zog (6000w) yog tib yam, ID 7 siv lub qhov xauv hom. Qhov no yog vim qhov txo qis hauv lub zog ceev ntawm ID 12 vim yog lub voj voog tseem ceeb (r = 0.2). Thaum tag nrho lub zog nce mus txog 7500 W (ID 15), kev nkag mus rau tag nrho cov hom tuaj yeem ua tiav, thiab piv rau 6000 W siv hauv ID 7, lub zog ntawm kev nkag mus rau tag nrho hom tau nce ntau.
IC xeem: Ua hom (ID 16 thiab 17) tau ua tiav ntawm 1500w tub ntxhais lub zog thiab 3000w thiab 3500w lub nplhaib lub zog. Thaum lub zog tseem ceeb yog 3000w thiab lub nplhaib lub zog yog nyob nruab nrab ntawm 1500w thiab 2500w (ID 19-20), pom tseeb cov kab nrib pleb tshwm nyob rau ntawm qhov sib cuam tshuam ntawm cov nplua nuj hlau thiab nplua nuj aluminium, tsim ib lub zos nkag mus rau qhov me me qauv. Thaum lub nplhaib fais fab yog 3000 thiab 3500w (ID 21 thiab 22), ua tiav kev nkag mus rau qhov tseem ceeb ntawm lub qhov.
Cov neeg sawv cev hla cov duab ntawm txhua qhov kev txheeb xyuas qhov vuam nyob rau hauv lub tshuab ntsuas qhov muag
Daim duab 4. (a) Kev sib raug zoo ntawm qhov kawg tensile lub zog (UTS) thiab lub zog piv hauv kev ntsuas vuam; (b) Tag nrho lub zog ntawm txhua qhov kev ntsuas vuam
Daim duab 5. (a) Kev sib raug zoo ntawm nam piv thiab UTS; (b) Kev sib raug zoo ntawm kev txuas ntxiv thiab kev nkag mus tob thiab UTS; (c) Lub zog ntom ntom rau txhua qhov kev ntsuas vuam
Daim duab 6. (ac) Vickers microhardness indentation contour daim ntawv qhia; (df) Sib txuam SEM-EDS tshuaj spectra rau cov neeg sawv cev conduction hom vuam; (g) Schematic daim duab ntawm kev sib tshuam ntawm cov hlau thiab txhuas; (h) Fe2Al5 thiab tag nrho IMC thickness ntawm conductive hom welds
Daim duab 7. (ac) Vickers microhardness indentation contour daim ntawv qhia; (df) Sib txuam SEM-EDS tshuaj spectrum rau cov neeg sawv cev hauv zos nkag mus rau perforation hom vuam
Daim duab 8. (ac) Vickers microhardness indentation contour daim ntawv qhia; (df) Sib txuam SEM-EDS tshuaj spectrum rau cov neeg sawv cev tag nrho kev nkag mus rau perforation hom vuam
Daim duab 9. EBSD zaj duab xis qhia txog cov nplej loj ntawm thaj tsam hlau nplua nuj (sab sauv phaj) hauv qhov kev ntsuam xyuas tag nrho ntawm kev nkag mus rau perforation hom, thiab ntsuas qhov loj ntawm cov nplej.
Daim duab 10. SEM-EDS spectra ntawm kev sib tshuam ntawm cov hlau nplua nuj thiab nplua nuj txhuas
Txoj kev tshawb no tshawb xyuas qhov cuam tshuam ntawm ARM laser ntawm kev tsim, microstructure, thiab cov khoom siv tshuab ntawm IMC hauv IF steel-1050 aluminium alloy dissimilar lap welded pob qij txha. Txoj kev tshawb no tau txiav txim siab peb hom kev sib txuas (kev coj ua, hom kev nkag mus hauv zos, thiab hom nkag mus puv) thiab peb xaiv laser beam duab (Gaussian beam, annular beam, thiab Gaussian annular beam). Cov txiaj ntsig kev tshawb fawb qhia tau hais tias xaiv qhov tsim nyog lub zog piv ntawm Gaussian beam thiab annular beam yog qhov tseem ceeb rau kev tswj kev tsim thiab microstructure ntawm cov pa roj carbon monoxide, yog li ua kom cov khoom siv zoo tshaj plaws ntawm vuam. Nyob rau hauv hom conduction, lub voj voog nrog lub zog piv ntawm 0.2 muab qhov zoo tshaj plaws vuam lub zog (71% kev sib koom ua haujlwm). Nyob rau hauv hom perforation, lub Gaussian beam tsim vuam qhov tob thiab ntau dua nam piv, tab sis qhov vuam siv tau txo qis. Cov kab hluav taws xob annular nrog lub zog piv ntawm 0.5 muaj qhov cuam tshuam loj rau kev ua kom zoo ntawm cov hlau sab hauv cov khoom siv weld seam. Qhov no yog vim qhov qis qis qis ntawm cov nqaj nqaj hlau ua rau lub zog txias sai dua, thiab kev loj hlob txwv ntawm Al solute tsiv teb tsaws mus rau sab sauv ntawm weld seam ntawm cov qauv nplej. Muaj kev sib raug zoo ntawm Vickers microhardness thiab Thermo Calc qhov kev kwv yees ntawm theem ntim feem pua. Qhov loj dua qhov ntim feem pua ntawm Fe4Al13, qhov siab dua qhov microhardness.
Post lub sij hawm: Jan-25-2024
