Real-time temperature measurement for process monitoring of laser conduction welding

Fabrice Bardin, Roy McBride, Andrew Moore, Stephen Morgan, Stewart Williams, J. D C Jones, Duncan P. Hand

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)

Abstract

Conduction welding offers an alternative to the keyhole welding process. Compared with keyhole welding it is intrinsically a very stable process since vaporization is minimal. However, as with keyhole welding, an on-line process monitoring system is part of the necessary quality assurance process in order to maintain the required penetration depth, which in conduction welding is more sensitive to changes in heat sinking. The maximal penetration is obtained when the surface temperature is just below the boiling point, and so we normally wish to maintain the temperature at this level. We describe a two-color optical system that we have developed for real-time temperature profile measurement of the conduction weld pool. The key feature of the system is the use of a CMOS standard color camera leading to a simplified low-cost optical set-up. We present and discuss the real-time temperature measurement performance of the system when using a defocused beam from a high power Nd:YAG laser on 13 mm aluminium workpieces.

Original languageEnglish
Title of host publicationICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings
Publication statusPublished - 2004
EventICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics - San Francisco, CA, United States
Duration: 4 Oct 20047 Oct 2004

Conference

ConferenceICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics
CountryUnited States
CitySan Francisco, CA
Period4/10/047/10/04

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