01 Ntawv Taw Qhia
Aluminium alloys, due to their high reflectivity and high thermal conductivity, tend to produce spatter in traditional laser welding because of excessive energy density and unstable keyholes, which affects weld quality and component performance. Txoj kev tshawb no tshawb xyuas cov txheej txheem los ntawm kev sim (teeb tsa lub zog sib txawv ntawm lub zog laser, cov tub ntxhais / lub nplhaib lub zog sib piv, thiab vuam ceev, soj ntsuam vapor plumes thiab spatter dynamics nrog lub siab- lub koob yees duab ceev, thiab tshuaj xyuas qhov sib txawv weld morphology nrog ultra- qhov tob- ntawm {4} thaj chaw microscopes {5} ob peb) thiab peb kev simulation. Nws qhia tau hais tias lub annular laser preheats pem hauv ntej ntug ntawm lub pas dej ua ke molten, txo cov kev hloov hauv laser nqus thiab stabilizing vapor plume ejection los suppress spatter. Tsis tas li ntawd, ib qho qauv sib txuas ua ntej qhov kub thiab txias rau tag nrho lub zog, lub nplhaib fais fab sib piv, thiab vuam ceev tau tsim, qhia tias qhov kub thiab txias yuav tsum nyob rau hauv thaj tsam ntawm cov khoom siv melting thiab boiling point. Txoj kev tshawb no muab cov txheej txheem rau kev xaiv spatter- cov txheej txheem tsis pub dawb, thiab cov kev sim paub tseeb tias spatter yog txo qis hauv qhov ntsuas qhov ntsuas no, muab cov kev qhia theoretical thiab cov tswv yim kev lag luam rau kev ua haujlwm siab -zoo laser vuam ntawm cov khoom zoo heev.
02 Cov ntsiab lus
Daim ntawv no yog ua raws li ib txoj hauv kev sib txuas cov kev sim thiab peb -dimensional transient multiphysics ua ke cov lej simulation. Qhov kev sim tsom rau 6061 aluminium alloy daim hlau, teeb tsa rau 6 core / nplhaib fais fab sib piv (10: 0 txog 0: 10), peb vuam ceev (40mm / s, 60mm / s, 80mm / s), thiab tag nrho laser zog (6000W). Lub koob yees duab siab-ceev ceev tau siv los soj ntsuam vapor plumes thiab spatter, ultra- qhov tob- ntawm-tej microscopes los soj ntsuam cov weld morphology, thiab kev sib piv nrog lub zog nruab nrab tau tsim. Tus lej simulation siv tus qauv CFD los simulate lub pas dej ua kua dej ntws, laser nqus, thiab lwm yam txheej txheem lub cev. Cov kev sim pom tau hais tias qhov kev faib ua feem ntau dua ntawm lub nplhaib laser lub zog, qhov sib txawv ntawm qhov chaw vuam ntau dua (nruab{18}} rau- hav qhov sib txawv txo los ntawm 1.40mm mus rau 0.41mm) thiab qhov sib tsoo zaus txo los ntawm 65%. Nws kuj tau qhia tias lub nplhaib laser preheats pem hauv ntej ntawm lub pas dej ua ke, txo qhov kev hloov pauv ntawm laser nqus, thiab ua kom lub vapor plume, uas suppresses spatter. Thaum kawg, ib qho qauv ntawm preheating kub thiab cov txheej txheem tsis tau tsim, qhia tias qhov kub thiab txias yuav tsum nyob nruab nrab ntawm cov khoom siv melting point thiab boiling point. Spatter-cov txheej txheem tsis pub dawb tau muab los thiab tshawb xyuas, muab kev qhia theoretical rau spatter-dawb laser vuam ntawm aluminium alloys.
03 Cov duab thiab cov ntawv txheeb xyuas
Daim duab 1 muaj ob lub ntsiab lus ntawm cov ntaub ntawv: ua ntej, Daim duab 1(a) nthuav qhia cov tub ntxhais kho vajtse teeb tsa ntawm lub nplhaib adjustable-mode laser vuam, suav nrog cov haujlwm thiab kev sib txuas ntawm cov khoom xws li CFX-8000 programmable fiber ntau laser ntaus ntawv, neeg hlau, laser ua lub taub hau thiab siab -ceev kev ua haujlwm ntawm lub koob yees duab, kev sib tw thiab kev sib tw lub hauv paus rau qhov kev sim tom ntej qhov ntsuas qhov ntsuas thiab kev soj ntsuam ntawm spatter thiab vapor plumes, kom ntseeg tau tus qauv ntawm kev sim ua haujlwm thiab sau cov ntaub ntawv; Thib ob, Daim duab 1(b) pom cov txheej txheem lub cev tseem ceeb hauv laser vuam, xws li theem hloov, laser nqus thiab vapor dynamics, tsim lub cev lub cev rau kev sib cuam tshuam ntawm laser thiab cov ntaub ntawv, muab lub hauv paus theoretical rau peb -dimensional transient multi-physical field coupled numerical simulations, thiab pab kev nkag siab ntawm kev nkag siab.
04 Xaus
Txoj kev tshawb no tsom rau qhov teeb meem spatter hauv adjustable annular laser vuam ntawm aluminium alloys. Los ntawm kev sim (teeb pom kev sib txawv ntawm cov tub ntxhais / lub nplhaib lub zog sib piv, vuam nrawm, ua ke nrog kev soj ntsuam siv siab - lub koob yees duab ceev thiab txuas ntxiv qhov tob- ntawm - teb microscopes) thiab peb - qhov ntev ntawm qhov sib txawv ntawm ntau qhov sib txuas ua ke ntawm cov lej simulations, cov txheej txheem los ntawm cov txheej txheem uas annular lasers molten lub hauv ntej molten qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm cov tub ntxhais / lub nplhaib fais fab sib txawv, qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv. Kev hloov pauv hauv laser nqus, thiab stabilizing lub vapor plume- tau tshwm sim. Ib qho qauv uas hais txog qhov kub thiab txias rau cov txheej txheem tsis tau raug tsim, tawm tswv yim tias qhov kub thiab txias yuav tsum nyob nruab nrab ntawm lub ntsiab lus melting thiab boiling point ntawm lub hauv paus khoom. Tsis muaj-spatter txheej txheem parameter cov txheej txheem tau muab los thiab sim ua pov thawj, qhia meej txog qhov kev xaiv parameter rau spatter{10}}vuam dawb ntawm aluminium alloys. Qhov no tuaj yeem coj kev lag luam tso siab rau lub teeb yuag aluminium Cheebtsam, xws li kev tsim tsheb, los daws cov teeb meem tshwm sim ntawm kev tawg siab thiab tsis zoo weld zoo nyob rau hauv cov pa laser vuam, txhawb kev txhim kho ntawm siab - zoo thiab ruaj khov kev lag luam ntawm aluminium alloy laser vuam.
