Abstract

Basic characteristics of electric resistance welding (ERW) were studied by using a Bead Shape meter and a temperature distribution measuring system with a silicon photodiode array in order to establish the controlling technique of ERW. Based on the information from these studies, the integrated heat control system, which is composed of on-line bead shape monitoring system and the automatic temperature distribution control system, has been developed. These systems were installed in small, medium and large diameter pipe mills.These systems are proved to be very effective to produce high quality tubes and pipes.

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