Mukalumikiza chitsulo ndi aluminiyamu, zomwe zimachitika pakati pa ma atomu a Fe ndi Al panthawi yolumikizira zimapanga ma brittle intermetallic compounds (IMCs). Kukhalapo kwa ma IMC awa kumachepetsa mphamvu zamakina zamalumikizidwe, chifukwa chake ndikofunikira kuwongolera kuchuluka kwazinthuzi. Chifukwa chopangira ma IMC ndikuti kusungunuka kwa Fe mu Al ndi koyipa. Ngati izo zidutsa ndalama zina, zingakhudze makina a weld. Ma IMC ali ndi mawonekedwe apadera monga kuuma, kukhazikika pang'ono ndi kulimba, ndi mawonekedwe a morphological. Kafukufuku wapeza kuti poyerekeza ndi ma IMC ena, wosanjikiza wa Fe2Al5 IMC amadziwika kuti ndi wosalimba kwambiri (11.8)± 1.8 GPa) IMC gawo, komanso chifukwa chachikulu cha kuchepa kwa makina katundu chifukwa kuwotcherera kulephera. Pepalali limafufuza njira yowotcherera ya laser yakutali ya IF chitsulo ndi aluminiyamu 1050 pogwiritsa ntchito njira yosinthira mphete ya laser, ndikufufuza mozama mphamvu ya mawonekedwe a mtengo wa laser pakupanga kophatikizana kwa intermetallic ndi katundu wamakina. Ndi kusintha pachimake / mphete mphamvu chiŵerengero, anapeza kuti pansi conduction akafuna, pachimake / mphete mphamvu chiŵerengero cha 0.2 akhoza kukwaniritsa bwino weld mawonekedwe kugwirizana pamwamba dera ndi kuchepetsa kwambiri makulidwe a Fe2Al5 IMC, potero kuwongolera kukameta ubweya mphamvu ya olowa. .
Nkhaniyi imayambitsa chikoka cha laser chosinthika cha ring mode pakupanga mapangidwe a intermetallic ndi katundu wamakina panthawi yakutali ya laser kuwotcherera kwa chitsulo cha IF ndi aluminium 1050. Zotsatira zafukufuku zikuwonetsa kuti pansi pa conduction mode, mphamvu yapakati / mphete ya mphamvu ya 0.2 imapereka malo akuluakulu ogwirizanitsa mawonekedwe a weld, omwe amasonyezedwa ndi kumeta ubweya wambiri wa 97.6 N / mm2 (kuphatikizana kwa 71%). Kuonjezera apo, poyerekeza ndi matabwa a Gaussian omwe ali ndi chiwerengero cha mphamvu kuposa 1, izi zimachepetsa kwambiri makulidwe a Fe2Al5 intermetallic compound (IMC) ndi 62% ndi makulidwe onse a IMC ndi 40%. Mu njira yowonongeka, ming'alu ndi mphamvu zochepetsera zometa zinawonedwa poyerekeza ndi njira yoyendetsera. Ndizofunikira kudziwa kuti kuwongolera kwakukulu kwambewu kudawoneka mumsoko wowotcherera pomwe mphamvu yapakati / mphete inali 0.5.
Pamene r = 0, mphamvu ya loop yokha imapangidwa, pamene r = 1, mphamvu yokhayo imapangidwa.
Chithunzi chojambula cha chiŵerengero cha mphamvu r pakati pa mtengo wa Gaussian ndi mtengo wa annular
(a) Chida chowotcherera; (b) Kuzama ndi m'lifupi kwa mbiri ya weld; (c) Chojambula chowonetsera zitsanzo ndi zoikamo
Mayeso a MC: Pokhapokha pamtengo wa Gaussian, msoko wowotcherera umakhala mumayendedwe osaya (ID 1 ndi 2), ndiyeno umasinthira kunjira yolowera pang'ono (ID 3-5), ndi ming'alu yoonekeratu. Pamene mphamvu ya mphete inakula kuchokera ku 0 kufika ku 1000 W, panalibe ming'alu yoonekera pa ID 7 ndipo kuya kwa chitsulo cholemera kunali kochepa. Mphamvu ya mphete ikawonjezeka kufika 2000 ndi 2500 W (ID 9 ndi 10), kuya kwa chitsulo cholemera kumawonjezeka. Kusweka kwambiri pa mphamvu ya mphete ya 2500w (ID 10).
Mayeso a MR: Pamene mphamvu yaikulu ili pakati pa 500 ndi 1000 W (ID 11 ndi 12), msoko wowotcherera uli mumayendedwe; Poyerekeza ID 12 ndi ID 7, ngakhale mphamvu yonse (6000w) ndi yofanana, ID 7 imagwiritsa ntchito njira yotsekera. Izi zili choncho chifukwa cha kuchepa kwakukulu kwa kachulukidwe ka mphamvu pa ID 12 chifukwa cha mawonekedwe a loop (r=0.2). Mphamvu yonse ikafika pa 7500 W (ID 15), njira yolowera yonse ingathe kupezedwa, ndipo poyerekeza ndi 6000 W yomwe imagwiritsidwa ntchito mu ID 7, mphamvu yolowera mkati imakula kwambiri.
Kuyesa kwa IC: Njira yoyendetsera (ID 16 ndi 17) idakwaniritsidwa pa mphamvu yayikulu ya 1500w ndi mphamvu ya mphete ya 3000w ndi 3500w. Pamene mphamvu pachimake ndi 3000w ndi mphete mphamvu pakati 1500w ndi 2500w (ID 19-20), ming'alu zoonekeratu kuonekera pa mawonekedwe pakati wolemera chitsulo ndi zotayidwa wolemera, kupanga m'deralo olowerera yaing'ono bowo chitsanzo. Pamene mphete mphamvu 3000 ndi 3500w (ID 21 ndi 22), kukwaniritsa zonse malowedwe keyhole mode.
Zithunzi zoyimilira zapakatikati pa chizindikiritso chilichonse chowotcherera pansi pa microscope ya kuwala
Chithunzi 4. (a) Ubale pakati pa mphamvu yomaliza (UTS) ndi chiŵerengero cha mphamvu pamayesero a kuwotcherera; (b) Mphamvu zonse zoyesa zowotcherera
Chithunzi 5. (a) Ubale pakati pa gawo ndi UTS; (b) Ubale pakati pa kukulitsa ndi kuya kwa kulowa ndi UTS; (c) Kachulukidwe kamphamvu pamayesero onse owotcherera
Chithunzi 6. (ac) Mapu a Vickers microhardness indentation; (df) Zowoneka bwino za SEM-EDS zamankhwala zowotcherera oyimilira; (g) Chithunzi chojambula cha mawonekedwe pakati pazitsulo ndi aluminiyamu; (h) Fe2Al5 ndi makulidwe onse a IMC a ma welds opangira ma conductive
Chithunzi 7. (ac) Mapu a Vickers microhardness indentation; (df) Zogwirizana ndi SEM-EDS chemical sipekitiramu zowotcherera oyimilira m'deralo zolowera perforation
Chithunzi 8. (ac) Mapu a Vickers microhardness indentation; (df) Yogwirizana ndi SEM-EDS chemical sipekitiramu kwa woyimilira kwathunthu perforation mode kuwotcherera
Chithunzi 9. Chiwembu cha EBSD chikuwonetsa kukula kwa tirigu wachigawo cholemera chachitsulo (mbale yapamwamba) pamayesero amtundu wa perforation, ndikuwerengera kukula kwa mbewu.
Chithunzi 10. SEM-EDS mawonekedwe a mawonekedwe pakati pa chitsulo cholemera ndi aluminiyamu wolemera
Kafukufukuyu adafufuza zotsatira za laser ya ARM pakupanga, microstructure, ndi makina a IMC mu IF steel-1050 aluminium alloy dissimilar lap welded joints. Kafukufukuyu adawona njira zitatu zowotcherera (machitidwe oyendetsa, njira yolowera, ndi kulowa kwathunthu) ndi mawonekedwe atatu osankhidwa a laser (mtengo wa Gaussian, mtengo wa annular, ndi mtengo wa Gaussian annular). Zotsatira zafukufuku zikuwonetsa kuti kusankha chiŵerengero choyenera cha mphamvu ya mtengo wa Gaussian ndi mtengo wa annular ndi gawo lofunikira pakuwongolera mapangidwe ndi microstructure ya carbon modal mkati, potero kukulitsa mphamvu zamakina a weld. Mumayendedwe a conduction, mtengo wozungulira wokhala ndi mphamvu ya 0,2 umapereka mphamvu yabwino kwambiri yowotcherera (71% yolumikizana bwino). Munjira yobowoleza, mtengo wa Gaussian umatulutsa kuya kwakukulu kowotcherera komanso mawonekedwe apamwamba, koma mphamvu yowotcherera imachepetsedwa kwambiri. Mtengo wa annular wokhala ndi mphamvu ya 0,5 umakhudza kwambiri kukonzanso kwazitsulo zam'mbali zazitsulo mumsoko wowotcherera. Izi zimachitika chifukwa cha kutentha kwapansi kwa mtengo wa annular womwe umatsogolera ku kuzizira kofulumira, komanso kuletsa kukula kwa Al solute migration kupita kumtunda kwa seam yowotcherera pamapangidwe ambewu. Pali kulumikizana kwamphamvu pakati pa Vickers microhardness ndi kulosera kwa Thermo Calc kwa gawo la gawo. Kukula kwa kuchuluka kwa voliyumu ya Fe4Al13, kumapangitsa kukula kwa microhardness.
Nthawi yotumiza: Jan-25-2024
