Research On Defect Recognition Of The Copper Steel Non-depth Of Fusion Weld Joint Based On Ultrasonic Testing

Research on the copper steel non-depth of fusion weld joint defect was systematicallyconducted in this thesis, by means of the CTS-22 supersonic instrumentation and theautomatic supersonic examination system. At the same time by using the direct contactprocess and the water immersion focusing method separately, the test on the copper steelweld joint has been carried.The copper steel non-depth of fusion weld joint welding characteristic, Weld jointunion characteristic was analyzed. Use the supersonic examination and the destructiveexamination way, definite copper steel non-depth of fusion weld joint defect type.Through the theoretical analysis and the experiment, chose supersonic probe, it hasbeen possible to examine by the copper steel non-depth of fusion weld joint copper sidesurface below 6mm Scope copper thickness and in the copper steel contact surface defectand the probe's correlation detection parameter.Based on copper steel non-depth of fusion weld joint defect type, prepare mainartificial defect.Has established take the standard defect A supersonic examination profile as the basisdistance gain size curve, area amplitude response curve and reflection altitude ofultrasonic-distance curve, for the copper steel non-depth of fusion weld joint defectlocalization, the quota has constructed the judgment frame initially.Making spectral analysis on the defect supersonic profile, the time domain, thefrequency range and the wavelet analysis characteristics of different defects has beenwithdrawn. It provides a data support for the realization of the defect recognition withautomatic supersonic examination system in the future, and also provides a foundation forthe automatic supersonic examination system threshold value establishment.