ULTRASONIC FLAW DETECTION DEVICES FOR THE CONTINUOUS AND AUTOMATIC ULTRASONIC INSPECTION OF MATERIAL AT A HIGH TEMPERATURE

摘要

1322380 Spray producers SUMITOMO METAL INDUSTRIES Ltd 7 Aug 1970 [9 Aug 1969] 38170/70 Heading B2F [Also in Division H4] Spray nozzles are provided for cooling a hot object moving through an ultrasonic flowdetection station, the spray being directed against the direction of movement of the object so that cooling water from these and other cooling nozzles is prevented from mixing with a main laminar-flow water jet used as a couplant for the ultrasonic energy, thereby avoiding the generation of noise signals by the mixing action and enabling the inspection of initially-hotter objects than would be possible if the other cooling nozzles were used alone. In the Fig. 3A system, spray nozzles 6 above and below hot object 7 are directed at an angle α to the object path 10. Other water spray nozzles 6-1, .... 6-n provide the main cooling effect and laminar flow jets 5 provide the acoustic coupling for inspection by reflection or through-transmission of ultrasonic pulses or continuous waves. Laminar flow jets may be used instead of spray nozzles 6-1, .... 6-n. Spray production (Fig. 1). Water at 2-10 Kg/cmSP2/SP pressure is ejected from inner nozzle 2 having a tip bevel angle α 1 =45‹-180‹. Compressed air at 1-2 Kg/cmSP2/SP pressure is supplied to outer nozzle I having a tip bevel angle α 2 =60‹-180‹. Nozzle 2 is threaded in nozzle 1 so that the separation of the two tips can be adjusted to vary the spray.