Multi-wedge ultrasonic phased array internal detection method and device of high-pressure container head weld joints

Abstract

The invention relates to an internal detection method and device of high-pressure container head weld joints and aims to provide a multi-wedge ultrasonic phased array internal detection method and device of high-pressure container head weld joints. The detection method and device can effectively perform ultrasonic phased array detection on multi-layer high-pressure hydrogen storage vessel head butt weld joints and have the characteristics of high detection sensitivity. The technical scheme is as follows: the multi-wedge ultrasonic phased array internal detection device of the high-pressure container head weld joints comprises an ultrasonic detector arranged outside and is characterized by further comprising a probe clamping device and a phased array probe mounted on the probe clamping device, wherein the phased array probe comprises a probe base, a plurality of array elements mounted on the probe base in a linear array, a protection film covering a plurality of array element surfaces,a probe mounting groove mounted on the protection film, a lead fixing rod as well as a lead for connecting the phased array probe and the ultrasonic detector.

Description

technical field [0001] The invention relates to a method and a device for internal detection of a high-pressure container head weld, in particular to a multi-wedge ultrasonic phased array internal detection method and device for a butt weld of a full-layer high-pressure hydrogen storage container head. Background technique [0002] The fully multi-layer high-pressure hydrogen storage container is a product independently developed and designed by my country. It has the advantages of large volume, high pressure bearing capacity, and online monitoring of hydrogen leakage. It is an important equipment for high-pressure hydrogen storage and has been used in hydrogen refueling stations. The full multi-layer high-pressure hydrogen storage container is a steel strip wound container with complex structure, so it is difficult to carry out non-destructive testing. It takes over forgings ( Figure 6 Shown) and the butt weld of the double-layer hemispherical head and the heat-affected zo...

AI Technical Summary

Problems solved by technology

The full multi-layer high-pressure hydrogen storage container is a steel strip wound container with a complex structure, so it is difficult to carry out non-destructive testing

It takes over forgings ( Image 6 Shown) and the butt weld of the double-layer hemispherical head and the heat-affected zone, due to the special structure, it is difficult for the existing radiographic testing, magnetic particle testing, penetrant testing and corresponding testing equipment to effectively detect the At present, there are few reports on the successful detection of such welds at home and abroad.

The weld area has a single-layer structure, which is different from other parts of the container (double or multi-layer). Once the defect expands, the container may rupture, which will seriously threaten the safety of equipment and personnel, and may even cause catastrophic accidents.

[0003] Since conventional external inspections cannot obtain effective results, internal inspections have become a possible research direction for such container inspections.

There is an opening with a narrow inner diameter at the top of the head of the fully multi-layer high-pressure hydrogen storage container, and conventional testing equipment cannot enter it.

Ultrasonic testing has the advantages of convenient operation, high resolution, low cost, wide application range, and high sensitivity to the detection of area defects in thick-walled containers. However, for the internal detection of such narrow openings, ultrasonic testing has the following problems: 1) The aperture 2) The inner wall surface is concave, and the radius of curvature is small, and the energy loss of ultrasonic propagation at the interface is large; 3) From the inner wall of the opening to the heat-affected zone outside the weld, the sound path exceeds 120mm. The commonly used ultrasonic focusing technology is difficult to meet the requirements; 4) The welding structure is complex, one side is double-layer low-alloy steel, the other side is single-layer austenitic stainless steel, it is difficult to judge the waveform, and the welding section is thick, so it is difficult to scan comprehensively in a single scan Covering the detection thickness range; 5) The weld is austenitic stainless steel with coarse grains and anisotropy, so the sound energy attenuation is large and the scattering is serious

Due to the above-mentioned multiple difficulties, it is difficult for the existing ultrasonic phased array technology to achieve satisfactory results for the detection of the butt weld seam of the head of a fixed full-layer high-pressure hydrogen storage vessel.

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