Acoustic emission control of welding seams of the bench longevity testing unit of the heavy plane landing gear

Acoustic emission (AE) control of welding defects in the process of cyclic loading of the stand was carried out. The stand is intended for life tests of the landing gear of a heavy aircraft. A certified microprocessor-based AE system SCAD-16.10 with “floating” selection thresholds was used. The AE signals emitted during the formation of defects that occur in the stand welds under the action of repeated cyclic tensile loads are registered. The location method with the calculation of their the difference in arrival times (DAT) based on the standard deviation (RMS) of the amplitude was used. The application was justified by analyzing the results of autocalibration of acoustic emission transducers (AET) which were installed on the top plate of the stand. Detection of developing design defects was carried out by analyzing changes in the parameters of AE signals that form active regions. The dependences of changes in the parameters of AE signals emitted by weld defects during their development in various areas of the stand were given.