Possibilities in optical monitoring of laser welding process

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F16%3APU139880" target="_blank" >RIV/00216305:26210/16:PU139880 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1117/12.2257234" target="_blank" >http://dx.doi.org/10.1117/12.2257234</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.2257234" target="_blank" >10.1117/12.2257234</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Possibilities in optical monitoring of laser welding process

Popis výsledku v původním jazyce

Laser welding is a modern, widely used but still not really common method of welding. With increasing demands on the quality of the welds, it is usual to apply automated machine welding and with on-line monitoring of the welding process. The resulting quality of the weld is largely affected by the behavior of keyhole. However, its direct observation during the welding process is practically impossible and it is necessary to use indirect methods. At ISI we have developed optical methods of monitoring the process. Most advanced is an analysis of radiation of laser-induced plasma plume forming in the keyhole where changes in the frequency of the plasma bursts are monitored and evaluated using Fourier and autocorrelation analysis. Another solution, robust and suitable for industry, is based on the observation of the keyhole inlet opening through a coaxial camera mounted in the welding head and the subsequent image processing by computer vision methods. A high-speed camera is used to understand the dynamics of the plasma plume. Through optical spectroscopy of the plume, we can study the excitation of elements in a material. It is also beneficial to monitor the gas flow of shielding gas using schlieren method.

Název v anglickém jazyce

Possibilities in optical monitoring of laser welding process

Popis výsledku anglicky

Laser welding is a modern, widely used but still not really common method of welding. With increasing demands on the quality of the welds, it is usual to apply automated machine welding and with on-line monitoring of the welding process. The resulting quality of the weld is largely affected by the behavior of keyhole. However, its direct observation during the welding process is practically impossible and it is necessary to use indirect methods. At ISI we have developed optical methods of monitoring the process. Most advanced is an analysis of radiation of laser-induced plasma plume forming in the keyhole where changes in the frequency of the plasma bursts are monitored and evaluated using Fourier and autocorrelation analysis. Another solution, robust and suitable for industry, is based on the observation of the keyhole inlet opening through a coaxial camera mounted in the welding head and the subsequent image processing by computer vision methods. A high-speed camera is used to understand the dynamics of the plasma plume. Through optical spectroscopy of the plume, we can study the excitation of elements in a material. It is also beneficial to monitor the gas flow of shielding gas using schlieren method.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

<a href="/cs/project/TA04020456" target="_blank" >TA04020456: Vývoj nových typů solárních absorbérů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

OAM 2016-30

ISBN

978-80-87026-02-1

ISSN

0277-786X

e-ISSN

—

Počet stran výsledku

6

Strana od-do

1-8

Název nakladatele

SPIE-INT SOC OPTICAL ENGINEERING

Místo vydání

BELLINGHAM

Místo konání akce

Liberec

Datum konání akce

16. 10. 2012

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

000393154700036