METHOD AND DEVICE OF WELDED JOINTS TESTING BY ACOUSTIC EMISSION DURING WELDING Russian patent published in 2012 - IPC G01N29/14 

FIELD: metal welding.

SUBSTANCE: method and device are intended for nondestructive testing of welded joints during welding by acoustic emission method. The method of acoustic emission control of the weld seal quality during welding is the registering activity and emission energy of the each cluster and setting activity limit values and signal energy limit values for welding process, after that keep acoustic signals registering and when second peak of the acoustic emission signal energy is appears and exceeds activity and cluster's signal energy limit values, this weld is rejected. The device is consists of 1…n blocks, each of which contains four channels consisting of series-connected acoustic transducer, pre-amplifier, filter, main transducer which output is connected with input of noninverted analog comparator and input of analog-digital converter of acoustic signal, and also contains analog-digital converter, operating storage, timer and multiplexer, control device, which output is connected with computer's central data processor by wire. For recording the activity of AE signal energy the main amplifier output is connected with analog signal detector, which output is connected with analog integrator of the channel; analog integrator's outputs are connected with according outputs of analogue summator, which output is connected with analog-digital converter of signal energy input, which digital output is connected with microprocessor's input.

EFFECT: increasing the reliability of control defects, decreasing the time of acoustic emission information handling, determination of the position and danger level of the weld seal during welding and cooling.

2 cl, 4 dwg