Kev sib piv ntawm vuam cuam tshuam ntawm lasers nrog txawv core diameters
Laser ua cov ntaub ntawv hlau yog tsuas yog thermal ua raws li cov nyhuv photothermal. Thaum lub laser irradiates saum npoo ntawm cov khoom, qhov chaw ntawm cov khoom yuav raug hloov ntau yam nyob rau hauv txawv zog densities. Cov kev hloov no muaj xws li qhov kub thiab txias, melting, vaporization, keyhole tsim, thiab photoplasma tiam. Tsis tas li ntawd, kev hloov ntawm lub cev lub cev ntawm cov khoom siv hauv cheeb tsam zoo heev cuam tshuam rau cov khoom nqus ntawm lub teeb laser. Feem ntau hais lus, qhov siab dua qhov kub, qhov siab dua cov khoom siv qhov nqus ntawm lub teeb laser. Nrog rau qhov nce ntawm lub zog ceev thiab lub sijhawm ua haujlwm, cov khoom siv hlau yuav raug hloov pauv hauv lub cev hauv qab no, raws li pom hauv daim duab 1 [1].
Muaj ob lub cores ntawm laser welding: tshav kub hloov thiab tshav kub conduction. Kev hloov hluav taws xob muaj feem xyuam rau qhov cua sov, lub zog ceev thiab kab hluav taws xob; Airflow rau kev kho kom zoo. Nyob rau hauv cov txheej txheem vuam, cov cua kub qhov chaw, lub zog ceev, thiab kab hluav taws xob feem ntau yog hloov kho. Cov txheej txheem tsis suav nrog: kev xaiv ntawm laser core inch, lub zog, ceev, thiab defocus tus nqi. Xav tias tsab xov xwm no tsuas yog tsom rau cov lasers nrog cov kab sib txawv ntawm cov tub ntxhais sib txawv thiab feem ntau suav nrog lub zog sib txawv, daim duab 2 qhia cov qauv kev suav yooj yim ntawm lub zog ntom ntom:
Muaj ob lub ntsiab ntawm laser welding raws li qhov nqus ntawm cov txheej txheem vuam, ib qho yog cua sov conduction vuam (qhov tob-dav piv<1, laser absorption rate of red light is within 20%, and different wavelengths are different), and the other is deep penetration welding (Aspect ratio > 1, the absorption rate is greater than the absorption rate of the molten pool of the material, more than 60%, mainly due to the multiple reflection and absorption of the laser in the keyhole).
Laser tshav kub conduction welding:
Txawv laser irradiance yuav ua rau txawv kev hloov nyob rau hauv lub xeev ntawm cov khoom, uas yog reflected nyob rau hauv lub vuam txheej txheem raws li ob yam welding hom: laser tshav kub conduction vuam thiab laser sib sib zog nqus nkag welding. Cov txheej txheem hloov hluav taws xob, vuam tsim mechanism, txheej txheem cov yam ntxwv thiab daim ntawv thov ntau yam ntawm ob qhov sib txawv heev.
Laser tshav kub conduction vuam hom:
Thaum tshav kub kub conduction vuam, lub laser irradiance irradiated nyob rau saum npoo ntawm lub workpiece yog nyob rau hauv thaj tsam ntawm 10E4 ~ 10E6W / cm, thiab lub zog laser yog absorbed los ntawm nyias txheej ntawm 10 ~ 100m ntawm qhov chaw. Lub zog laser ntawm qhov chaw raug xa mus rau sab hauv ntawm cov khoom siv los ntawm kev siv hluav taws xob, thiab lub laser tsis tuaj yeem kov ncaj qha. Tom qab ib lub sij hawm ntawm laser irradiation, nto mus txog melting, thiab no melting isotherm propagates tob rau hauv cov khoom, thiab qhov kub ntawm qhov chaw tseem nce. Tab sis qhov siab tshaj plaws tuaj yeem ncav cuag qhov kub ntawm cov khoom, txawm tias qhov kub siab npaum li cas, cov khoom yuav vaporize thiab tsim cov pits, cov txheej txheem kub kub ruaj khov yuav raug rhuav tshem, lub pas dej molten yuav oscillate, thiab cov khoom yuav yog. hlawv. Feem ntau, tshav kub conduction welding feem ntau yog siv rau hauv daim hlau nyias. Hauv qhov no Yuav tsum tau muab qhov xaus rau nws. Nrog rau qhov txheeb ze ntawm lub laser beam thiab lub workpiece, ib tug ntiav thiab dav weld seam yog tsim, raws li qhia nyob rau hauv daim duab 3. Qhov tob-rau-dav ratio ntawm weld seam yog me me, thiab qhov dav ntawm weld seam yog feem ntau. ntau tshaj ob zaug qhov tob tob. Daim duab hauv qab no qhia tau hais tias tus ntoo khaub lig-sectional tsos ntawm ib tug raug laser tshav kub conduction vuam seam, thiab cov duab ntawm weld seam yog kwv yees li hemispherical.
Kev sib piv ntawm cov tub ntxhais txoj kab uas hla sib txawv lasers:
(1) Qhov ceev ntawm qhov kev sim yog 150mm / s, txoj hauj lwm ua kom pom tseeb yog welded, cov khoom yog 1 series txhuas, thiab lub thickness yog 2 hli;
(2) Qhov loj ntawm cov tub ntxhais txoj kab uas hla, qhov loj dua qhov dav ntawm fusion, qhov loj dua qhov kub-kawg cheeb tsam, thiab qhov me me ntawm chav tsev zog ceev. Thaum cov tub ntxhais txoj kab uas hla tshaj 200um, nws tsis yog ib qho yooj yim mus cuag qhov tob tob ntawm high-reactions alloys xws li txhuas thiab tooj liab, thiab yuav tsum tau muaj zog dua yuav ua tau tob tob welding;
(3) Cov tub ntxhais txoj kab uas hla me me laser muaj lub zog ceev ceev, tuaj yeem nrawm nrawm rau ntawm qhov chaw ntawm cov khoom siv nrog lub zog siab, thiab muaj thaj chaw me me, tab sis tib lub sij hawm qhov chaw ntawm qhov vuam yog ntxhib, Qhov tshwm sim ntawm qhov tawg ntawm qhov tseem ceeb yog qhov siab thaum lub sij hawm vuam qis, thiab lub qhov tseem ceeb raug kaw thaum lub sij hawm vuam lub voj voog Ntev, yooj yim los tsim qhov tsis xws luag, qhov pores thiab lwm yam tsis xws luag, haum rau kev kub ceev los yog ua nrog viav vias khiav;
(4) Loj-inch lasers yog tsim nyog rau laser nto remelting, cladding, annealing thiab lwm yam txheej txheem vim lawv qhov chaw loj thiab ntau dispersed zog.
Cov ntaub ntawv zoo heev: aluminium, tooj liab, stainless hlau, npib tsib xee, molybdenum, thiab lwm yam .;
(1) Cov khoom siv hluav taws xob siab yuav tsum xaiv lub laser me me. Siv lub tshuab hluav taws xob muaj zog-nruj siab ceev kom sov cov khoom mus rau lub xeev liquefied lossis vaporized, txhim kho lub laser nqus ntawm cov khoom, thiab ua tiav kev ua haujlwm tau zoo thiab ceev ceev. Nws yog ib qho yooj yim xaiv ib lub laser nrog ib tug loj core txoj kab uas hla. Ua kom muaj kev xav tau siab, ua rau lub vuam virtual, thiab txawm tias hlawv tawm lub laser;
Cov khoom tawg yooj yim: npib tsib xee, npib tsib xee-plated tooj liab, txhuas, stainless hlau, titanium alloy, thiab lwm yam.
(2) Cov khoom siv no feem ntau yuav tsum muaj kev tswj hwm nruj ntawm thaj chaw muaj kev kub ntxhov thiab yuav tsum muaj lub pas dej me me. Nws yog qhov tsim nyog xaiv lub laser me me;
High-speed laser ua:
(3) Kev sib sib zog nqus welding yuav tsum muaj kev ua haujlwm siab ceev laser, thiab nws yog ib qho tsim nyog los xaiv lub laser nrog lub zog ceev kom paub meej tias cov kab hluav taws xob txaus los yaj cov khoom ntawm kev kub ceev, tshwj xeeb tshaj yog rau kev sib tsoo vuam, nkag mus vuam, thiab lwm cov cores me uas xav tau kev nkag siab tob tob. Radial lasers yog tsim nyog.
Advantages and applications of large core lasers (>100 hli):
Cov tub ntxhais txoj kab uas hla loj thiab qhov chaw loj, thaj chaw tshav kub loj, qhov chaw ua haujlwm dav, thiab tsuas yog ua tiav micro-melting ntawm cov khoom siv, tsim nyog rau kev siv hauv laser cladding, laser remelting, laser annealing, laser hardening, thiab lwm yam. thaj chaw, ib qho chaw loj txhais tau hais tias muaj kev tsim khoom ntau dua thiab qis dua (cov khoom siv hluav taws xob hluav taws xob yuav luag tsis muaj qhov tsis xws luag).
Nyob rau hauv cov nqe lus ntawm vuam, qhov chaw loj yog tsuas yog siv rau kev sib xyaw vuam, uas yog siv rau kev sib xyaw nrog cov tub ntxhais me me txoj kab uas hla laser: qhov chaw loj ua rau saum npoo ntawm cov khoom yaj me ntsis, hloov los ntawm cov khoom mus rau cov kua, uas zoo heev txhim kho tus nqi nqus. ntawm cov khoom siv rau lub laser, thiab tom qab ntawd siv cov tub ntxhais me me Hauv cov txheej txheem no, vim yog qhov preheating ntawm qhov chaw loj, tom qab ua tiav, thiab qhov kub thiab txias gradient muab rau lub pas dej molten, cov khoom siv tsis tuaj yeem ua rau tawg tsis xws luag. los ntawm cua kub ceev thiab ceev txias. Nws tuaj yeem ua rau cov tsos ntawm cov vuam smoother, thiab tib lub sij hawm ua kom qis qis dua li ib qho kev daws teeb meem laser.
