: Dear sirs: I am interested to know if there are NDT : which could be applied to on line resitance spot welding : equipment, or to know some literature on this subject : Thank you in advance
It is possible, to make ultrasonic measurements on line (see: Krautkrämer), but this simple method doesn´t seem to be very reliable.
It is possible to use for this purpose our holographic method,that we have developed for fingerprint recognition (see: http://www.optel.com.pl/article/english/article.htm ). We are interested in developing this method for this purpose, but we need a partner, interesting in financing and/or using this development.
Using such holographic device, it would be possible to see in real time the contact surface and the material changes in the neighbourhood.