Ultrasonic phased array and TOFD (Time of Flight Diffraction) integrated automatic tracking scanning device for welding seam of U rib of steel bridge deck and top plate and welding seam defect detection method

Abstract

The invention relates to an ultrasonic phased array and TOFD (Time of Flight Diffraction) integrated automatic tracking scanning device for a U-rib welding seam of a steel bridge deck and a top plate and a welding seam defect detection method. The device comprises a walking mechanism, a direction regulation and control mechanism, an automatic coupling agent spraying mechanism, a phased array and TOFD integrated scanning mechanism, an automatic tracking and control mechanism, a detection host and a lithium battery, the walking mechanism is in transmission connection with the direction regulation and control mechanism; the phased array and TOFD integrated scanning mechanism comprises a phased array scanning probe and a TOFD scanning probe which are electrically connected with the detection host respectively; the coupling agent automatic spraying mechanism is used for providing a coupling agent for the phased array scanning probe and the TOFD scanning probe; the automatic tracking and control mechanism comprises a photoelectric sensor and a control end module; the welding seam defect detection method is used for realizing welding seam tracking and welding seam flaw detection. The method can solve the problems of large detection distance, high strength and single-method evaluation of the U rib fillet weld of the steel bridge deck panel, can reduce the workload of detection personnel, and improves the overall detection efficiency and evaluation accuracy.

Description

technical field [0001] The invention relates to the field of welding seam detection, in particular to an ultrasonic phased array and TOFD integrated automatic tracking scanning device and a welding seam defect detection method for a U-rib welding seam of a steel bridge deck roof. Background technique [0002] With the continuous development of the field of bridge construction, steel structure bridges have the advantages of small steel structure section, light weight, high strength, good ductility, large safety reserve, and good seismic performance, which makes the use of steel in bridges in new construction and reconstruction projects. The proportion of structural bridges has been significantly improved. [0003] The orthotropic steel bridge deck is an important part and the main stress member of the steel structure bridge. The welding seam between the bridge deck and the U-rib is subjected to the repeated action of vehicle loads during the operation period, which can easily...

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Problems solved by technology

[0003] The orthotropic steel bridge deck is an important part and the main force-bearing member of the steel structure bridge. The welds connecting the bridge deck and the U-rib are subjected to repeated loads of vehicles during the operation period, which can easily induce fatigue along the joint between the U-rib and the bridge deck. Cracks seriously affect the service life of the bridge deck

[0004] For the quality inspection of the bridge deck and U-rib connection welds, conventional methods: (1) Visual inspection + magnetic powder can only be used to detect surface and near-surface defects, and cannot detect deep defects inside the steel bridge deck; (2) Conventional A It is very difficult to detect the internal quality of U-rib fillet welds by ultrasonic means, and it is difficult to distinguish the unpenetrated top signal from the defect signal and the reflection signal from the geometric interface; The efficiency is low, it is difficult to meet the needs of the project progress, and the cost is also high; in the bridge structure, there are many fillet welds between the U rib and the bridge deck, and the inspection workload is heavy. The current manual hand-held scanning method cannot achieve automatic inspection , resulting in low detection efficiency, high strength, and tight construction schedules for inspectors; currently, a single ultrasonic phased array or TOFD inspection cannot accurately evaluate defects

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