Laser vuamtuaj yeem ua tiav siv cov kab nrib pleb lossis cov kab teeb ci laser. Cov ntsiab cai ntawmlaser vuamtuaj yeem muab faib ua cua sov conduction vuam thiab laser sib sib zog nqus nqus vuam. Thaum lub zog ceev yog tsawg dua 104 ~ 105 W / cm2, nws yog cov cua sov conduction vuam. Lub sijhawm no, qhov nkag mus tob yog qhov ntiav thiab qhov vuam nrawm nrawm; Thaum lub zog ceev yog ntau dua 105 ~ 107 W / cm2, hlau nto yog concave rau hauv "qhov" vim cua sov, sib sib zog nqus nqus vuam, uas muaj nws cov yam ntxwv ntawm ceev vuam ceev thiab loj nam piv. Lub hauv paus ntsiab lus ntawm thermal conductionlaser vuamyog: laser hluav taws xob heats saum npoo yuav tsum tau ua, thiab cov nplaim hluav taws kub diffuses rau sab hauv los ntawm thermal conduction. Los ntawm kev tswj cov laser tsis xws li laser mem tes dav, lub zog, lub zog siab tshaj plaws, thiab rov ua dua zaus, lub workpiece yog melted los tsim ib lub pas dej ua ke.
Laser sib sib zog nqus nkag welding feem ntau siv ib tug nruam laser beam kom tiav cov kev twb kev txuas ntawm cov ntaub ntawv. Nws cov txheej txheem metallurgical lub cev zoo ib yam li electron beam welding, uas yog, lub zog hloov tshuab ua tiav los ntawm "qhov tseem ceeb-qhov" qauv.
Nyob rau hauv laser irradiation nrog lub siab txaus lub zog ceev, cov khoom evaporates thiab me me qhov yog tsim. Lub qhov me me uas muaj vapor zoo li lub cev dub, absorbing yuav luag txhua lub zog ntawm qhov teeb meem kab teeb. Qhov sib npaug ntawm qhov kub ntawm lub qhov mus txog 2500°C. Cov cua sov yog hloov los ntawm cov phab ntsa sab nraud ntawm qhov kub kub, ua rau cov hlau nyob ib puag ncig lub qhov kom yaj. Lub qhov me me yog ntim nrog cov cua kub siab uas tsim los ntawm cov evaporation tas li ntawm cov khoom siv phab ntsa hauv qab irradiation ntawm cov nqaj. Cov phab ntsa ntawm lub qhov me me yog nyob ib puag ncig los ntawm cov hlau molten, thiab cov hlau ua kua yog nyob ib puag ncig los ntawm cov khoom siv (hauv feem ntau cov txheej txheem vuam thiab laser conduction vuam, lub zog ua ntej tso rau ntawm qhov chaw ua haujlwm thiab tom qab ntawd thauj mus rau sab hauv los ntawm kev hloov pauv. ). Cov kua dej ntws tawm sab nraud ntawm lub qhov phab ntsa thiab qhov nro ntawm phab ntsa txheej yog nyob rau theem nrog lub zog ua haujlwm tsis tu ncua hauv lub qhov kab noj hniav thiab tswj kom muaj qhov sib npaug. Lub teeb lub teeb tsis tu ncua nkag mus rau hauv lub qhov me me, thiab cov khoom siv sab nraud ntawm lub qhov me me txuas ntxiv ntws. Raws li lub teeb beam txav, lub qhov me me yeej ib txwm nyob rau hauv ib qho chaw ruaj khov.
Uas yog hais tias, lub qhov me me thiab cov hlau molten nyob ib puag ncig lub qhov phab ntsa txav mus rau pem hauv ntej nrog rau pem hauv ntej ceev ntawm tus tsav beam. Cov hlau molten sau qhov sib txawv sab laug tom qab lub qhov me me raug tshem tawm thiab condenses raws li, thiab cov weld yog tsim. Tag nrho cov no tshwm sim sai heev uas vuam ceev tau yooj yim mus txog ob peb meters ib feeb.
Tom qab to taub cov ntsiab lus tseem ceeb ntawm lub zog hluav taws xob, thermal conductivity vuam, peb yuav sib sib zog nqus vuam,
Kev sib piv ntawm cov kev sim vuam raws li cov laser core diameters hauv khw:
Lub zog ceev ntawm focal chaw txoj hauj lwm ntawm lasers nrog txawv core diameters
Los ntawm qhov kev xav ntawm lub zog ceev, nyob rau hauv tib lub zog, qhov me me ntawm cov tub ntxhais txoj kab uas hla, qhov siab dua qhov ci ntawm lub laser thiab lub zog ntau dua. Yog hais tias lub laser muab piv rau ib tug ntse riam, qhov me me ntawm cov tub ntxhais txoj kab uas hla, lub sharper lub laser. Lub zog ceev ntawm 14um core inch laser yog ntau tshaj 50 npaug ntawm 100um core inch laser, thiab kev ua haujlwm muaj peev xwm muaj zog dua. Nyob rau tib lub sij hawm, lub zog ceev xam ntawm no tsuas yog ib qho yooj yim nruab nrab ceev. Kev faib hluav taws xob tiag tiag yog kwv yees li Gaussian faib, thiab lub zog hauv nruab nrab yuav yog ob peb zaug ntawm qhov nruab nrab lub zog ceev.
Schematic daim duab ntawm laser zog faib nrog txawv core diameters
Cov xim ntawm daim duab faib hluav taws xob yog qhov kev faib hluav taws xob. Lub redder xim, lub zog ntau dua. Lub zog liab yog qhov chaw uas lub zog muaj zog. Los ntawm lub zog laser faib ntawm cov kab teeb ci nrog cov kab sib txawv ntawm cov tub ntxhais, nws tuaj yeem pom tau tias lub laser beam pem hauv ntej tsis ntse thiab lub teeb laser yog ntse. Qhov me me, qhov ntau concentrated lub zog nyob rau ntawm ib qho taw tes, qhov sharper nws yog thiab muaj zog dua nws cov peev xwm nkag mus.
Kev sib piv ntawm vuam cuam tshuam ntawm lasers nrog txawv core diameters
Kev sib piv ntawm lasers nrog txawv core diameters:
(1) Qhov kev sim siv qhov ceev ntawm 150mm / s, tsom txoj haujlwm vuam, thiab cov khoom siv yog 1 series txhuas, 2mm tuab;
(2) Qhov loj ntawm cov tub ntxhais txoj kab uas hla, qhov loj ntawm lub melting dav, qhov loj ntawm qhov kub-kawg cheeb tsam, thiab qhov me me lub zog ceev. Thaum cov tub ntxhais txoj kab uas hla tshaj 200um, nws tsis yog ib qho yooj yim mus cuag ib tug tob tob ntawm high-reactions alloys xws li txhuas thiab tooj liab, thiab ib tug ntau dua sib sib zog nqus welding yuav ua tau tsuas yog nrog lub zog siab;
(3) Cov tub ntxhais lasers me me muaj lub zog siab ceev thiab tuaj yeem nrawm nrawm rau ntawm qhov chaw ntawm cov khoom siv nrog lub zog siab thiab cov cheeb tsam me me. Txawm li cas los xij, tib lub sijhawm, qhov saum npoo ntawm qhov vuam yog qhov ntxhib, thiab qhov tseem ceeb ntawm qhov tawg yuav muaj siab thaum vuam qis, thiab lub qhov tseem ceeb raug kaw thaum lub voj voog vuam. Lub voj voog ntev ntev, thiab qhov tsis xws li qhov tsis xws luag thiab qhov pores yog qhov tshwm sim. Nws yog qhov tsim nyog rau kev ua haujlwm siab lossis ua haujlwm nrog lub viav vias trajectory;
(4) Cov tub ntxhais txoj kab uas hla loj lasers muaj lub teeb pom kev loj dua thiab ntau lub zog tawg, ua rau lawv tsim nyog rau laser nto remelting, cladding, annealing thiab lwm yam txheej txheem.
Post lub sij hawm: Oct-06-2023
