초록 ▼

A EMAT inspection system is utiliized on sheet metal prior to it being formed or rolled to identify surface defects and sub-surface defects such as pencil pipe inclusions by using ultrasonic Lamb waves with the results being displayed on a remote screen of a display and control system which also rec

A EMAT inspection system is utiliized on sheet metal prior to it being formed or rolled to identify surface defects and sub-surface defects such as pencil pipe inclusions by using ultrasonic Lamb waves with the results being displayed on a remote screen of a display and control system which also records the inspection results and controls the EMAT system.

대표청구항 ▼

[ What is claimed is:] [1.] An automated inspection system for non-destructively examining strip sheet metal moving in a strip travel direction for pencil pipe defects prior to rolling, or forming, the sheet metal strip having a width transverse to the travel directions, the inspection system compri

[ What is claimed is:] [1.] An automated inspection system for non-destructively examining strip sheet metal moving in a strip travel direction for pencil pipe defects prior to rolling, or forming, the sheet metal strip having a width transverse to the travel directions, the inspection system comprising:a first transmitting electromagnetic acoustic transducer mounted for movement over a sheet metal strip moving in the strip travel direction, said first transmitting electromagnetic acoustic transducer propagating an ultrasonic Lamb wave into a first coverage zone extending partly across the width of the sheet metal strip;a first receiving electromagnetic acoustic transducer mounted for movement over the sheet metal strip, said first receiving electromagnetic transducer receiving a reflected ultrasonic Lamb wave from said first coverage zone;a second transmitting electromagnetic acoustic transducer mounted for movement over the sheet metal strip, said second transmitting electromagnetic acoustic transducer propagating an ultrasonic Lamb wave into a second coverage zone extending partially across the width of the sheet metal strip,a second receiving electromagnetic acoustic transducer mounted for movement over the sheet metal strip, said second receiving electromagnetic transducer receiving a reflected ultrasonic Lamb wave from said second coverage zone;computer control means connected to and in communication with said first and second electromagnetic acoustic acoustic transducers for coordinating the inspection of the sheet metal strip for said pencil pipe defects; anddata acquisition means connected to and in communication with all of said computer control means for receiving, storing, displaying and analyzing information provided from said computer control means and for transmitting information thereto, said data acquisition means detecting any defects in the sheet metal strip which has moved in the travel direction based on changes in the ultrasonic Lamb wave.