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A system and method for measuring the height of incomplete penetration defects of pipe-tube sheet fillet welds

A technology for incomplete penetration and fillet welds, which is applied in the field of measurement system for the height of incomplete penetration defects of pipe-tube plate fillet welds, can solve the problems of non-proposed and quantitative measurement of incomplete penetration height, achieve convenient processing and improve assessment accuracy The effect of high speed and simple operation

Active Publication Date: 2022-07-05
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the relevant specifications put forward quantitative requirements for the limit of the height of the non-penetration defect, the domestic and foreign standards do not propose how to quantitatively measure the height of the non-penetration defect

Method used

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  • A system and method for measuring the height of incomplete penetration defects of pipe-tube sheet fillet welds
  • A system and method for measuring the height of incomplete penetration defects of pipe-tube sheet fillet welds
  • A system and method for measuring the height of incomplete penetration defects of pipe-tube sheet fillet welds

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Experimental program
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Effect test

Embodiment 1

[0033] see figure 1 and figure 2 , this embodiment is described by taking the application of the strength welded pipe-tube sheet fillet weld of a chemical heat exchanger in our unit according to the ASME standard radiographic inspection as an example, and the inspection process and inspection steps are carried out in the following order:

[0034] 1. Make a scale 7 according to the following conditions:

[0035] (1) The scale is made of stainless steel, which has a certain rigidity and is not easy to deform;

[0036] (2) The scale is evenly set on the scale, and the graduation accuracy of the scale is at least 0.5mm;

[0037] (3) The thickness of the scale is not more than 1mm, the depth of the scale is not more than 0.2mm, and the width is not more than 0.15mm;

[0038] (4) The scale has an installation round hole 12, and the round hole should be concentric with the compensation block and the rod anode of the X-ray machine;

[0039] (5) The "0" position of the scale is se...

Embodiment 2

[0058] In this embodiment, such as image 3 The strength-welded pipe-tube sheet fillet weld structure of the chemical heat exchanger shown is measured. The specification of the pipe is Φ31.75×3.4mm (R=12.47mm), and the surface of the tube sheet is welded with 8mm thick surfacing. The material of the surfacing layer is ALLOY 625, the welding method is electroslag surfacing welding; the fillet weld groove is a circular arc groove with a radius of 2.5, the welding height is 2.5mm, and the welding method is automatic tungsten argon arc welding. The pressure difference on both sides of the tube sheet is more than 6Mpa, and the outer wall of the nozzle is a chemical reaction medium, so the tightness and internal quality of the heat exchanger tube-tube sheet fillet weld are relatively high.

[0059] Testing requirements: (agreed by the manufacturer and the user) the limit of the height of the incomplete penetration of the root is 0.5mm.

[0060] Except for the inner inclined groove ...

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Abstract

The invention relates to welding seam inspection, and specifically discloses a measuring method for measuring the height of incomplete penetration defects of pipe-tube sheet fillet welds. The measuring system includes an X-ray machine, a transillumination film and a scale. The X-ray The ray focus of the machine is placed in the pipe, and the transillumination film and the scale are placed outside the weld to be tested in turn. When the ray focus of the pipe irradiates the weld to be tested, the incomplete penetration defects on the weld to be tested can be seen through the weld. An image is formed on the photographic film, and the scale can read the image scale value. The measuring system fills the gap in domestic and foreign countries where there is a demand for the control of the underpenetration height of the weld, but there is no measuring method. In addition, the above system is used to measure the height of incomplete penetration defects of pipe-tube sheet fillet welds. The measurement operation is simple and fast, and the measurement results are true, reliable, and consistent. It is of great significance for evaluating whether incomplete penetration defects exceed the standard.

Description

technical field [0001] The invention relates to welding seam measurement, in particular to a system and method for measuring the incomplete penetration defect height of a pipe-tube sheet fillet weld. Background technique [0002] With the rapid development of chemical technology, large-scale, complex and high-parameter chemical heat exchanger products continue to emerge, which puts forward higher requirements for the reliability of product operation to ensure reliable operation of products in harsh operating conditions and reduce unit costs. A key factor in the unplanned downtime rate is the quality of the heat exchanger tube and tube sheet fillet welds. Frequent leakage of fillet welds between tubes and tube sheets not only reduces the heat exchange and production efficiency of the unit, but also leads to unstable operating parameters, which seriously affects the service life of the unit. Therefore, only the surface inspection of the corner seam between the tube and the tu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/18
CPCG01N23/18
Inventor 陈太军谢进谭云华张军辉潘毅杜显禄石爱玲
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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