Laser welding tshuab siv dav siv, tab sis vuam tsis xws luag xws li cov kab nrib pleb, vuam kab thiab tawg yog feem ntau nrog cov txheej txheem vuam. Txoj kev tshawb fawb tau ua tiav nyob hauv tsev thiab txawv teb chaws. Lawv ua ke nrog laser vuam nrog oscillation, mem tes thiab lwm txoj kev. Thaum kawm txog txoj ntsiab cai, lawv kuj tseem ceeb qhov tseem ceeb rau kev sib xyaw nrog cov khoom siv khoom lag luam, thiab nquag siv cov khoom tshiab los txhawb lawv tus kheej kev tshawb fawb. Txoj kev tshawb fawb muaj kev ua haujlwm siab.
Kev tshawb fawb hauv tsev tseem ceeb tsom rau yuav ua li cas los daws qhov tsis xws luag ntawm laser vuam sib txuas, thiab kev tsim lub tshuab ntawm vuam tsis xws luag kuj tau kawm hauv kev nthuav dav. Ntau pawg kws tshawb fawb tau kawm txog cov teeb meem ntawm cov pas dej dab tshos thiab cov xim nrawm rau lub zog los ntawm kev sim sim thiab tshuaj xyuas lub tshuab hluav taws xob. Lub zog loj laser irradiation rau kev ua haujlwm nto ua rau cov khoom ua rau vaporize sai thiab tsim keyhole, yog li qhov zoo ntawm vuam yog txiav txim siab los ntawm Fresnel nqus cov nyhuv ntawm molten pas dej ua ke thiab keyhole.
Cov vuam tsis xws luag yog tsim nyob rau hauv cov txheej txheem ntawm laser vuam, raws li qhia hauv daim duab yog cov plooj (porosity defect) ua los ntawm laser vuam galvanized DP780 lub zog loj steel. Peng Nanxiang ntawm Hunan University tau kawm txog qhov tseem ceeb thiab Fresnel nqus ntawm laser sib sib zog nqus nqus hlau. Nws pom tias qhov faib ntawm tag nrho cov hwj chim ceev ntawm Fresnel nqus tau tsis sib xws vim muaj ntau qhov cuam tshuam ntawm laser hauv keyhole. Qhov ntom ntom ntawm lub qhov phab ntsa ze rau hauv qab ntawm qhov tseem ceeb yog qhov ntau dua li qhov ntawm lub qhov taub sab saud, thiab cov khoom siv tseem ceeb cuam tshuam rau qhov ntom ntom ntom ntom ntom ntom ntom ntom ntog yog laser ua kom pom tseeb.
Ib qho tseem ceeb tsom xam laser vuam txheej txheem tseem muaj qee cov kev txwv. Piv txwv li, nws tsis tuaj yeem tswj qhov ntsuas kub thaum lub sijhawm vuam, thiab thaum cov khoom siv vuam siv nrog qhov ntsuas kub siab, cov kab nrib pleb tau yooj yim kom pom sab hauv weld. Txhawm rau kom khov kho cov txheej txheem vuam, ntau cov kws tshawb fawb tau kawm txog kev tsom xam ob chav laser vuam. Pang Shengyong thiab lwm tus ntawm Huazhong University of science thiab thev naus laus zis tau kawm txog kev ruaj ntseg ntawm cov keyhole thiab cov ndlwg hauv cov pas dej sib xyaw xim txhuas hauv qab hom ntawm laser ob chav tsom mus rau kev npaj.
Lub tuam txhab txuas ua qauv ntawm kev hloov cov pas dej ntxuav ntawm lub cev thiab cov dej ntws sab hauv ntawm aluminium alloy ob chav tsom xam laser vuam tau tsim. Tus qauv tshav kub tau tsim los ntawm txoj kev thaij duab hluav taws xob, thiab cov cuam tshuam ntawm Fresnel nqus cov nyhuv, chav recoil quab yuam thiab cov dej ntws sab hauv ntawm cov pas nrig sib xyaw tau txiav txim siab. Cov txiaj ntsig pom tau hais tias qhov kev tsom xam ob lub laser vuam yog qhov ruaj khov thiab tswj tau, thiab kev hloov pauv ntawm keyhole yog pom tias tsis muaj zog tshaj qhov ntawm ib leeg laser vuam.
Piv nrog rau txawv teb chaws, kev tshawb fawb hauv tsev ntawm kev hloov cov nqaj duab ntawm cov kab teeb ci me yog tsawg, feem ntau lawv tsom mus rau kev hloov cov xov tooj ntawm cov nqaj, tab sis kev tshawb fawb ntawm cov khoom siv laser tsis zoo. Cov pab pawg tshawb fawb txawv teb chaws sim siv cov khoom siv kho qhov muag tshiab los tshawb nrhiav qhov tsim ntawm qhov tseem ceeb ntawm pob zeb pob zeb tawg thiab cov pas dej sib tsoo.
Qee tus kws tshawb fawb txawv teb chaws tseem tau sim cov thev naus laus zis tshiab los txhim kho qhov tsis xws ntawm laser vuam, xws li siv nqaj oscillation lossis laser lub zog hloov kho los txo qhov tshwm sim ntawm cov tsis xws luag. Volppj li al. Txais yuav qhov kev tsim kho tshiab multifocal nqaj tsim cov kev ua haujlwm zoo, uas tuaj yeem tsim ntau txoj kab teeb ci nyob sab xub ntiag laser ua qhov kev taw qhia axial, thiab hloov kho lub zog cov tswv yim hauv cov keyhole hauv thaj chaw ntxiv los piav qhia txog lub mechanism ntawm kev tsim cov spatter, thiab ntsuas lub peev xwm ntawm axial nqaj tsim. txhawm rau tshem tawm cov tsis xws luag hauv laser tob tob kev nqus hlau. Cov txiaj ntsig pom tau hais tias nyob rau hauv qhov siab siv lub teeb tsis muaj teeb meem, qhov sib txig sib txig tuaj yeem txo qis, qhov vau ntawm qhov tseem ceeb tuaj yeem zam, qhov cuam tshuam lub zog txaus tuaj yeem ua rau hauv seem sab saud, thiab cov kua dej tawm tuaj yeem txo qis.
