Qhov cuam tshuam ntawm lub zog hloov kho tau annular spot laser rau ntawm kev tsim thiab cov khoom siv kho tshuab ntawm cov khoom sib xyaw intermetallic hauv cov hlau txhuas laser welded lap joints

Thaum txuas hlau rau txhuas, qhov kev sib xyaw ntawm Fe thiab Al atoms thaum lub sijhawm txuas tsim cov khoom sib xyaw ua ke (IMCs). Qhov muaj cov IMCs no txwv tsis pub lub zog ntawm kev sib txuas, yog li nws yog qhov tsim nyog los tswj qhov ntau ntawm cov tshuaj no. Qhov laj thawj rau kev tsim cov IMCs yog tias qhov solubility ntawm Fe hauv Al tsis zoo. Yog tias nws tshaj qhov ntau, nws yuav cuam tshuam rau cov khoom siv kho tshuab ntawm qhov vuam. IMCs muaj cov khoom tshwj xeeb xws li qhov nyuaj, kev txwv ductility thiab toughness, thiab cov yam ntxwv morphological. Kev tshawb fawb tau pom tias piv rau lwm cov IMCs, Fe2Al5 IMC txheej yog suav tias yog qhov brittle tshaj plaws (11.8± 1.8 GPa) IMC theem, thiab kuj yog qhov laj thawj tseem ceeb rau kev txo qis ntawm cov khoom siv kho tshuab vim yog kev vuam tsis ua haujlwm. Daim ntawv no tshawb nrhiav cov txheej txheem vuam laser deb ntawm IF hlau thiab 1050 txhuas siv lub nplhaib hloov kho hom laser, thiab tshawb nrhiav tob txog kev cuam tshuam ntawm cov duab laser beam rau kev tsim cov khoom sib xyaw thiab cov khoom siv kho tshuab. Los ntawm kev kho qhov sib piv ntawm lub zog tseem ceeb / nplhaib, nws tau pom tias nyob rau hauv hom conduction, lub zog tseem ceeb / nplhaib ntawm 0.2 tuaj yeem ua tiav qhov zoo dua ntawm qhov sib txuas ntawm qhov chaw sib txuas thiab txo qhov tuab ntawm Fe2Al5 IMC, yog li txhim kho lub zog shear ntawm qhov sib koom ua ke.

Tsab xov xwm no qhia txog kev cuam tshuam ntawm lub nplhaib hloov kho laser rau kev tsim cov khoom sib xyaw thiab cov khoom siv kho tshuab thaum lub sijhawm vuam laser deb ntawm IF hlau thiab 1050 txhuas. Cov txiaj ntsig tshawb fawb qhia tau tias nyob rau hauv hom conduction, lub zog ntawm lub hauv paus / lub nplhaib ntawm 0.2 muab qhov loj dua ntawm qhov sib txuas ntawm qhov chaw sib txuas, uas tau cuam tshuam los ntawm lub zog siab tshaj plaws ntawm 97.6 N / mm2 (kev ua haujlwm sib koom ua ke ntawm 71%). Tsis tas li ntawd, piv rau Gaussian beams nrog lub zog piv ntau dua 1, qhov no txo ​​​​​​qhov tuab ntawm Fe2Al5 intermetallic compound (IMC) los ntawm 62% thiab tag nrho IMC tuab los ntawm 40%. Hauv hom perforation, cov kab nrib pleb thiab qis dua shear zog tau pom piv rau hom conduction. Nws yog ib qho tsim nyog sau cia tias qhov kev ua kom zoo dua ntawm cov noob tau pom hauv qhov vuam seam thaum lub zog ntawm lub hauv paus / lub nplhaib yog 0.5.

Thaum r = 0, tsuas yog lub zog voj voog xwb, thaum thaum r = 1, tsuas yog lub zog tseem ceeb xwb.

Daim duab kos ntawm lub zog piv r ntawm Gaussian beam thiab annular beam

(a) Lub cuab yeej vuam; (b) Qhov tob thiab dav ntawm qhov profile vuam; (c) Daim duab qhia txog kev tso saib cov qauv thiab cov khoom siv teeb tsa

Kev xeem MC: Tsuas yog nyob rau hauv rooj plaub ntawm Gaussian beam, lub weld seam yog thawj zaug nyob rau hauv hom kev sib txuas lus ntiav (ID 1 thiab 2), thiab tom qab ntawd hloov mus rau qee qhov nkag mus rau hom qhov rooj xauv (ID 3-5), nrog rau cov kab nrib pleb pom tseeb. Thaum lub zog ntawm lub nplhaib nce ntxiv los ntawm 0 txog 1000 W, tsis muaj cov kab nrib pleb pom tseeb ntawm ID 7 thiab qhov tob ntawm cov hlau nplua nuj yog qhov me me. Thaum lub zog ntawm lub nplhaib nce mus txog 2000 thiab 2500 W (IDs 9 thiab 10), qhov tob ntawm thaj chaw nplua nuj hlau nce ntxiv. Kev tawg ntau dhau ntawm 2500w lub zog ntawm lub nplhaib (ID 10).

Kev xeem MR: Thaum lub zog tseem ceeb nyob nruab nrab ntawm 500 thiab 1000 W (ID 11 thiab 12), qhov vuam seam yog nyob rau hauv hom conduction; Piv rau ID 12 thiab ID 7, txawm hais tias tag nrho lub zog (6000w) yog tib yam, ID 7 siv hom xauv qhov. Qhov no yog vim muaj qhov txo qis ntawm lub zog ceev ntawm ID 12 vim yog lub voj voog tseem ceeb (r = 0.2). Thaum tag nrho lub zog ncav cuag 7500 W (ID 15), hom kev nkag mus tag nrho tuaj yeem ua tiav, thiab piv rau 6000 W siv hauv ID 7, lub zog ntawm hom kev nkag mus tag nrho tau nce ntxiv ntau.

Kev sim IC: Hom kev ua haujlwm (ID 16 thiab 17) tau ua tiav ntawm 1500w lub zog tseem ceeb thiab 3000w thiab 3500w lub zog nplhaib. Thaum lub zog tseem ceeb yog 3000w thiab lub zog nplhaib yog nruab nrab ntawm 1500w thiab 2500w (ID 19-20), cov kab nrib pleb pom tseeb tshwm sim ntawm qhov sib txuas ntawm cov hlau nplua nuj thiab cov txhuas nplua nuj, tsim cov qauv me me nkag mus rau hauv zos. Thaum lub zog nplhaib yog 3000 thiab 3500w (ID 21 thiab 22), ua tiav hom qhov nkag mus tag nrho.

Cov duab sawv cev ntawm txhua qhov kev txheeb xyuas vuam hauv qab lub tshuab microscope

Daim Duab 4. (a) Kev sib raug zoo ntawm lub zog tensile kawg (UTS) thiab lub zog piv hauv kev sim vuam; (b) Tag nrho lub zog ntawm txhua qhov kev sim vuam

Daim Duab 5. (a) Kev sib raug zoo ntawm qhov sib piv thiab UTS; (b) Kev sib raug zoo ntawm qhov ntev thiab qhov tob nkag mus thiab UTS; (c) Lub zog ceev rau txhua qhov kev sim vuam

Daim Duab 6. (ac) Daim Ntawv Qhia Txog Vickers microhardness indentation contour; (df) Cov tshuaj SEM-EDS sib xws rau cov qauv vuam conduction sawv cev; (g) Daim duab kos ntawm qhov sib txuas ntawm hlau thiab txhuas; (h) Fe2Al5 thiab tag nrho IMC tuab ntawm cov qauv vuam conductive

Daim Duab 7. (ac) Daim Ntawv Qhia Txog Vickers microhardness indentation contour; (df) Cov tshuaj lom neeg SEM-EDS sib xws rau cov qauv vuam perforation hauv zos.

Daim Duab 8. (ac) Daim Ntawv Qhia Txog Vickers microhardness indentation contour; (df) Cov tshuaj lom neeg SEM-EDS sib xws rau kev sawv cev tag nrho kev nkag mus rau hauv hom kev vuam.

Daim Duab 9. Daim duab EBSD qhia txog qhov loj ntawm cov noob ntawm thaj chaw nplua nuj hlau (phaj sab saud) hauv qhov kev sim hom kev nkag mus tag nrho, thiab ntsuas qhov kev faib tawm ntawm cov noob.

Daim Duab 10. SEM-EDS spectra ntawm qhov sib txuas ntawm cov hlau nplua nuj thiab cov txhuas nplua nuj

Daim ntawv tshawb fawb no tau tshawb nrhiav txog cov teebmeem ntawm ARM laser rau kev tsim, microstructure, thiab cov khoom siv kho tshuab ntawm IMC hauv IF steel-1050 aluminium alloy dissimilar lap welded joints. Daim ntawv tshawb fawb tau xav txog peb hom vuam (hom conduction, hom nkag mus hauv zos, thiab hom nkag mus tag nrho) thiab peb cov duab laser beam xaiv (Gaussian beam, annular beam, thiab Gaussian annular beam). Cov txiaj ntsig tshawb fawb qhia tau tias kev xaiv qhov sib piv zog ntawm Gaussian beam thiab annular beam yog qhov tseem ceeb rau kev tswj hwm kev tsim thiab microstructure ntawm cov pa roj carbon sab hauv, yog li ua kom cov khoom siv kho tshuab ntawm qhov vuam zoo tshaj plaws. Hauv hom conduction, lub beam voj voog nrog lub zog piv ntawm 0.2 muab lub zog vuam zoo tshaj plaws (71% kev ua haujlwm sib koom ua ke). Hauv hom perforation, lub beam Gaussian tsim qhov tob vuam ntau dua thiab qhov sib piv siab dua, tab sis qhov sib zog vuam raug txo qis heev. Lub beam annular nrog lub zog piv ntawm 0.5 muaj qhov cuam tshuam loj rau kev ua kom zoo ntawm cov hlau sab hauv cov hlau vuam. Qhov no yog vim qhov kub qis dua ntawm lub annular beam ua rau qhov txias sai dua, thiab qhov cuam tshuam kev loj hlob ntawm Al solute migration mus rau sab saud ntawm lub weld seam ntawm cov qauv noob. 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.