SEDL / STP / STP1077-EB / STP19082S

Monitoring Electron Beam Welding Process Using Electro-Magnetic Acoustic Transducers (EMAT's)

Crostack, HA
research scientistsdirector, Fachgebiet Qualitatskontrolle, Universitat Dortmund, Dortmund,

Storp, HJ
research scientistsdirector, Fachgebiet Qualitatskontrolle, Universitat Dortmund, Dortmund,

Bohm, P
research scientistsdirector, Fachgebiet Qualitatskontrolle, Universitat Dortmund, Dortmund,

Pages: 10    Published: Jan 1991

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Abstract

This paper describes the use of acoustic emission analysis (AEA) to monitor and control an electron beam welding process. For this to be successful requires that the signals emitted during the welding process be detected and that a good correlation can be established between the welding parameters and the acoustic signals. Weld monitoring applications place special requirements on both the electronic system as well as the sensor used to detect the AE signals. These requirements include a good directional selectivity and a capability for operation at high-temperatures which limits the use of piezoelectric sensors. In this paper the application of non-contact, electromagnetic acoustic transducers is described. The operation of such a sensor to detect the acoustic emissions accompanying an electron beam welding process is demonstrated and their application in a weld-monitoring system is described.