Lus Txhais ntawm Splash Defect: Splash nyob rau hauv vuam yog hais txog cov molten hlau droplets ejected los ntawm lub molten pas dej ua ke thaum lub sij hawm vuam txheej txheem. Cov tee dej no tuaj yeem poob rau ntawm qhov chaw ua haujlwm ib puag ncig, ua rau roughness thiab tsis sib xws ntawm qhov chaw, thiab tseem tuaj yeem ua rau poob ntawm lub pas dej ua ke zoo, ua rau cov hniav tawg, cov ntsiab lus tawg, thiab lwm yam tsis xws luag ntawm qhov chaw weld uas cuam tshuam rau cov khoom siv ntawm lub vuam. .
Splash nyob rau hauv vuam yog hais txog cov molten hlau droplets ejected los ntawm lub molten pas dej ua ke thaum lub sij hawm vuam txheej txheem. Cov tee dej no tuaj yeem poob rau ntawm qhov chaw ua haujlwm ib puag ncig, ua rau roughness thiab tsis sib xws ntawm qhov chaw, thiab tseem tuaj yeem ua rau poob ntawm lub pas dej ua ke zoo, ua rau cov hniav tawg, cov ntsiab lus tawg, thiab lwm yam tsis xws luag ntawm qhov chaw weld uas cuam tshuam rau cov khoom siv ntawm lub vuam. .
Splash Classification:
Me me splashes: Solidification droplets tam sim no nyob rau ntawm ntug ntawm lub weld seam thiab nyob rau saum npoo ntawm cov khoom, feem ntau cuam tshuam rau cov tsos thiab tsis muaj kev cuam tshuam rau kev ua tau zoo; Feem ntau, ciam teb rau qhov txawv yog tias cov tee dej yog tsawg dua 20% ntawm cov weld seam fusion dav;
Loj splatter: Muaj qhov tsis zoo, tshwm sim raws li cov hniav tawg, cov ntsiab lus tawg, undercuts, thiab lwm yam nyob rau saum npoo ntawm weld seam, uas tuaj yeem ua rau qhov tsis sib xws ntawm kev ntxhov siab thiab strain, cuam tshuam rau kev ua haujlwm ntawm weld seam. Lub hom phiaj tseem ceeb yog rau cov hom kev tsis xws luag.
Splash tshwm sim txheej txheem:
Splash yog manifested raws li kev txhaj tshuaj ntawm molten hlau nyob rau hauv lub molten pas dej ua ke nyob rau hauv ib tug kev taw qhia roughly perpendicular mus rau lub vuam kua nto vim acceleration siab. Qhov no tuaj yeem pom meej meej hauv daim duab hauv qab no, qhov twg cov kua kem nce los ntawm cov vuam yaj thiab decomposes rau hauv cov tee dej, tsim splashes.
Splash tshwm sim scene
Laser vuam muab faib ua thermal conductivity thiab sib sib zog nqus welding.
Thermal conductivity welding yuav luag tsis muaj tshwm sim ntawm spatter: Thermal conductivity welding feem ntau cuam tshuam nrog kev hloov ntawm tshav kub los ntawm qhov chaw ntawm cov khoom mus rau sab hauv, uas yuav luag tsis muaj spatter generated thaum lub sij hawm tus txheej txheem. Cov txheej txheem tsis cuam tshuam nrog cov hlau evaporation hnyav lossis cov tshuaj tiv thaiv lub cev metallurgical.
Kev sib sib zog nqus welding yog qhov xwm txheej tseem ceeb uas tshwm sim: sib sib zog nqus nqus vuam cuam tshuam nrog laser ncav ncaj qha rau hauv cov khoom, xa cov cua sov mus rau cov khoom los ntawm cov qhov tseem ceeb, thiab cov txheej txheem cov tshuaj tiv thaiv yog khaus, ua rau nws lub ntsiab scenario qhov twg splashing tshwm sim.
Raws li pom nyob rau hauv daim duab saum toj no, qee cov kws tshawb fawb siv kev yees duab nrawm ua ke nrog cov iav pob tshab kub kub los saib xyuas cov xwm txheej ntawm lub qhov tseem ceeb thaum lub sij hawm laser vuam. Nws tuaj yeem pom tau tias lub laser pib tsoo rau pem hauv ntej phab ntsa ntawm lub qhov tseem ceeb, thawb cov kua kom ntws mus rau hauv qab, hla lub qhov tseem ceeb thiab ncav cuag tus Tsov tus tw ntawm lub pas dej molten. Txoj hauj lwm uas lub laser tau txais nyob rau hauv lub qhov tseem ceeb yog tsis ruaj, thiab lub laser nyob rau hauv ib tug Fresnel absorption xeev nyob rau hauv lub qhov tseem ceeb. Qhov tseeb, nws yog ib lub xeev ntawm ntau refractions thiab nqus, tswj lub hav zoov ntawm molten pas dej ua kua. Txoj hauj lwm ntawm lub laser refraction thaum lub sij hawm txhua txoj kev hloov nrog lub kaum sab xis ntawm lub keyhole phab ntsa, ua rau lub keyhole nyob rau hauv ib tug twisting lub xeev. Lub laser irradiation txoj hauj lwm melts, evaporates, raug quab yuam, thiab deforms, yog li lub peristaltic kev co txav mus rau pem hauv ntej.
Qhov kev sib piv uas tau hais los saum toj no siv cov iav pob tshab kub kub, uas yog qhov sib npaug ntawm qhov pom ntawm lub pas dej molten. Tom qab tag nrho, lub xeev ntws ntawm lub pas dej molten txawv ntawm qhov xwm txheej tiag tiag. Yog li ntawd, qee cov kws tshawb fawb tau siv cov tshuab ua kom khov sai. Thaum lub sij hawm vuam txheej txheem, lub molten pas dej ua ke yog ceev ceev kom tau txais lub instantaneous xeev nyob rau hauv lub keyhole. Nws tuaj yeem pom meej meej tias lub laser yog tsoo rau pem hauv ntej phab ntsa ntawm qhov keyhole, tsim ib kauj ruam. Lub laser ua rau cov kauj ruam no, thawb lub pas dej molten kom ntws mus rau hauv qab, sau qhov sib txawv ntawm lub qhov tseem ceeb thaum lub sij hawm lub laser txav mus rau pem hauv ntej, thiab yog li tau txais qhov kwv yees qhov kev taw qhia ntawm cov dej ntws hauv lub qhov tseem ceeb ntawm lub pas dej molten tiag. Raws li pom nyob rau hauv txoj cai daim duab, cov hlau recoil siab generated los ntawm laser ablation ntawm cov kua hlau tsav cov kua molten pas dej ua ke mus bypass pem hauv ntej phab ntsa. Lub keyhole txav mus rau tus Tsov tus tw ntawm lub pas dej molten, surging upwards zoo li ib tug ciav los ntawm lub rear thiab cuam tshuam rau saum npoo ntawm tus Tsov tus tw molten pas dej ua ke. Nyob rau tib lub sijhawm, vim qhov nro saum npoo (qhov qis dua qhov kub ntawm qhov kub, qhov cuam tshuam ntau dua), cov kua hlau nyob hauv lub pas dej molten yog rub los ntawm qhov nro kom txav mus rau ntawm ntug ntawm lub pas dej molten, tsis tu ncua solidifying. . Cov kua hlau uas tuaj yeem ua kom ruaj khov rau yav tom ntej yuav rov qab mus rau tus Tsov tus tw ntawm lub qhov tseem ceeb, thiab lwm yam.
Schematic daim duab ntawm laser keyhole sib sib zog nqus welding: A: Vuam kev taw qhia; B: Laser nqaj; C: Qhov tseem ceeb; D: Hlau vapor, plasma; E: Cov roj tiv thaiv; F: Keyhole pem hauv ntej phab ntsa (pre melting sib tsoo); G: Kab rov tav ntws ntawm cov khoom molten los ntawm txoj kev keyhole; H: Melt pool solidification interface; I: Txoj kev downward ntws ntawm lub pas dej molten.
Cov txheej txheem kev sib cuam tshuam ntawm laser thiab cov khoom siv: Lub laser ua rau ntawm qhov chaw ntawm cov khoom, ua kom muaj zog ablation. Cov khoom yog thawj rhuab, melted, thiab evaporated. Thaum cov txheej txheem evaporation khaus, cov hlau vapor txav mus rau pem hauv ntej kom muab lub pas dej molten downward recoil siab, ua rau lub qhov tseem ceeb. Lub laser nkag mus rau hauv lub qhov tseem ceeb thiab ua rau ntau yam emissions thiab nqus cov txheej txheem, uas ua rau cov khoom siv txuas ntxiv ntawm cov hlau vapor tswj lub qhov tseem ceeb; Lub laser feem ntau ua rau pem hauv ntej phab ntsa ntawm lub qhov tseem ceeb, thiab evaporation mas tshwm sim nyob rau hauv pem hauv ntej phab ntsa ntawm lub keyhole. Lub recoil siab thawb cov kua hlau los ntawm phab ntsa pem hauv ntej ntawm lub qhov tseem ceeb kom txav mus los ntawm qhov keyhole mus rau tus Tsov tus tw ntawm lub pas dej molten. Cov kua txav ntawm kev kub ceev nyob ib ncig ntawm lub qhov tseem ceeb yuav cuam tshuam rau lub pas dej molten upwards, tsim tsa nthwv dej. Tom qab ntawd, tsav los ntawm qhov nro, nws txav mus rau ntawm ntug thiab solidifies nyob rau hauv xws li ib lub voj voog. Splash feem ntau tshwm sim ntawm ntug ntawm qhov qhib qhov qhib, thiab cov kua hlau ua rau ntawm phab ntsa pem hauv ntej yuav ceev nrawm hla lub qhov tseem ceeb thiab cuam tshuam rau txoj hauj lwm ntawm phab ntsa tom qab molten pas dej ua ke.
Lub sij hawm xa tuaj: Mar-29-2024
