ACOUSTIC EMISSION CONTROL OVER RAIL WELD QUALITY AND DEVICE TO THIS END Russian patent published in 2014 - IPC G01N29/14 

FIELD: instrument making.

SUBSTANCE: invention can be used for acoustic emission control over rail weld quality. This invention consists in welding the butt, cutting of flash, registration of acoustic emission signals at weld cooling, measurement of acoustic emission signal count rate and division of control time into intervals. In case acoustic emission signal count rate is larger than threshold magnitude in at least one interval, weld quality is evaluated, Note here that, additionally, median of acoustic emission signal power is defined, threshold magnitudes are set by mean count rates and median of localised acoustic emission signal in two equal time intervals at weld cooling. In case count rate and signal power medians exceed their threshold magnitudes at whatever time intervals, welds are rejected.

EFFECT: higher validity of weld quality control.

2 cl, 2 dwg