Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Research on eddy current testing of buried deep defects in dissimilar metal niobium titanium welds
| DOI: | 10.11809/bqzbgcxb2025.03.032 |
| Keywords: | eddy current testing; dissimilar metal welds; scan offset; buried deep defects;liquid rocket engine |
| Abstract: | In order to solve the problems of small buried deep defects, signal interference detection of dissimilar metal butt welds, and narrow detection space of niobium titanium electron beam butt welds of liquid rocket engines, a new structural eddy current probe with high sensitivity and perpendicular detection coil to the tangential position of the weld was developed. Through the finite element simulation research of dissimilar metal welds, the simulation data such as eddy current density and voltage amplitude of the section were analyzed, which provided a theoretical basis for the detection of new probe structures. The manual scanning path offset test was carried out to draw the trend of the detected defect signal to verify the feasibility of the probe’s high sensitivity and anti interference signal. The results show that the signal to noise ratio of 5 mm×0.1 mm×0.5 mm (length×width×depth) and buried depth of 0.5 mm can reach 10∶1, and the signal to noise ratio of defects of the same size can still reach 3∶1 when the center of the weld is offset by 4 mm. It is proved that the new probe structure has high sensitivity detection ability and suppresses the interference signal of dissimilar metal butt welds, which is expected to be applied to the quality inspection of other metal welds. |
| Issue: | Vol. 46 No. 3 (2025) |
| Published: | 2025-03-31 |