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Multi-layer diffusion welding phased array ultrasonic detection method

A technology of diffusion welding and ultrasonic testing, which is used in the generation of ultrasonic/sonic/infrasonic waves, the analysis of solids using sonic/ultrasonic/infrasonic waves, and the analysis of materials using sonic/ultrasonic/infrasonic waves.

Pending Publication Date: 2020-10-23
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on phased array ultrasonic testing methods for diffusion welding, and there are no relevant reports and researches on this technology in the detection of multilayer diffusion welding structures in the literature and patent technology searches.

Method used

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  • Multi-layer diffusion welding phased array ultrasonic detection method
  • Multi-layer diffusion welding phased array ultrasonic detection method
  • Multi-layer diffusion welding phased array ultrasonic detection method

Examples

Experimental program
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preparation example Construction

[0029] 1. Preparation of multilayer diffusion welding comparison test block:

[0030] The structural form of the comparison test block should be the same as that of the workpiece to be inspected, that is, the welding material, number of welding layers, thickness of the welding layer and welding process must be consistent with the workpiece. The comparison test block is as follows: figure 1 shown, where figure 1 (b) for figure 1 In the top view of (a), a flat-bottomed hole 3 with the same diameter is provided on the diffusion-welded joint surface 2 of each plate layer 1. The diameter is selected according to the quality requirements, usually 0.8mm to 3.0mm, and the depth is 0.5mm. The flat-bottomed hole 3 Process the welding surface before welding, and directly form a reference reflector after welding. Except for the prefabricated reference reflector, there should be no other defects in the test block.

[0031] The flat-bottomed holes 3 are located on the centerline of the te...

Embodiment

[0045] The present invention will be described in more detail below in conjunction with specific examples. A multilayer diffusion welding phased array ultrasonic detection method of the present embodiment includes the following steps:

[0046] 1. Preparation of comparative test block:

[0047] The structure of the comparison test block produced in this example is the same as that of the inspected workpiece, the material is 316L, and there are 10 layers (9 diffusion welding interfaces) in total. Before welding, a plate with a diameter of 0.8 mm and a depth of 0.5 mm flat-bottomed holes, the horizontal distance between each flat-bottomed hole and the distance between the ends are 30mm, and the welding process is the same as that of the inspected workpiece.

[0048] 2. Basic configuration of detection system

[0049] A 64-channel portable phased array ultrasonic detector is selected as the detection equipment, the maximum number of excitation apertures is 64, and the probe is pr...

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Abstract

The invention relates to a multi-layer diffusion welding phased array ultrasonic detection method. The method comprises the steps of reference block preparation, detection system basic configuration,excitation program setting, detection sensitivity setting, scanning detection, defect evaluation and the like. The detection sensitivity of different welding layers is calibrated by using a special reference block for multi-layer diffusion welding, a detection result is imaged and displayed by adopting a linear scanning scheme, the detection sensitivity is high, the defect detection rate is high,the detection result is reliable, the detection result is imaged in real time, repeated scanning at the defect position is facilitated, the defect recognition accuracy is improved, the key technical problem of phased array ultrasonic detection of a multi-layer diffusion welding structure is solved, limitation of a detection site is avoided, and rapid and reliable detection of products can be achieved.

Description

technical field [0001] The invention relates to the field of non-destructive testing of welded structures, in particular to a multilayer diffusion welding phased array ultrasonic testing method. Background technique [0002] Diffusion welding is a welding method that uses heat and pressure to make the atoms between the contact surfaces diffuse each other to form a connection through the close fit of the weldments. Diffusion welding technology can be widely used in the same or dissimilar welding of stainless steel, titanium alloy, aluminum alloy and other materials, and has the advantages of small stress deformation after welding and light structure weight. When the diffusion welding process is improper, it is easy to produce defects, but due to the particularity of defects, it is always a difficult point for non-destructive testing. [0003] The gap size of diffusion welding defects is only a few microns, and this tiny thickness difference cannot be detected by radiographic...

Claims

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Application Information

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IPC IPC(8): G01N29/06G01N29/22G01N29/34G01N29/44
CPCG01N29/069G01N29/221G01N29/348G01N29/4409
Inventor 王海登鄂楠刘向前孙鹏远李培跃余巍蒋鹏边传新
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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