Automated system for laser ultrasonic sensing of weld penetration

Summary form only given. An online sensor is required for real-time control of penetration depth in robotic welding. Currently, no online techniques exist for direct penetration depth measurement. The development of a penetration control system will significantly reduce the costs associated with rep...

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Bibliographic Details
Published inProceedings of IEEE/ASME International Conference on Advanced Intelligent Mechatronics p. 59
Main Authors Graham, G.M., Ume, I.C.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1997
Subjects
Acoustic measurements
Automatic control
Control systems
Current measurement
Electromagnetic measurements
Optical arrays
Robot sensing systems
Robotics and automation
Ultrasonic variables measurement
Welding
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Summary:Summary form only given. An online sensor is required for real-time control of penetration depth in robotic welding. Currently, no online techniques exist for direct penetration depth measurement. The development of a penetration control system will significantly reduce the costs associated with repairing or scrapping defective welds. Laser array generated ultrasound is a noncontact, nondestructive method that can potentially be used to measure weld penetration. This paper will discuss the design and implementation of an automated system that was used to measure the depth of simulated solidified welds. The system consists of a laser array generation source and an electromagnetic acoustic transducer (EMAT) receiver. Measured penetration results for the simulated weld is compared with the exact results. Experimental results will also be shown for array gain measurements in order to demonstrate the power of the array. This automated system is being modified in readiness for use in actual robotic welding.
ISBN:0780340809
9780780340800
DOI:10.1109/AIM.1997.652922