Tube-tube sheet fillet weld incomplete penetration defect height measurement system and method

A technology of height measurement and measurement system, which is applied in the direction of material analysis using radiation, etc., can solve the problems of quantitative measurement of incomplete penetration height and no proposal, and achieve the effects of improving evaluation accuracy, convenient processing, and true measurement results

Active Publication Date: 2019-12-27
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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  • Tube-tube sheet fillet weld incomplete penetration defect height measurement system and method
  • Tube-tube sheet fillet weld incomplete penetration defect height measurement system and method
  • Tube-tube sheet fillet weld incomplete penetration defect height measurement system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] see figure 1 and figure 2 , this embodiment is illustrated by taking the strength-welded pipe-tube plate fillet weld of a chemical heat exchanger in our unit as an example in accordance with the ASME standard ray detection application, and the detection process and detection steps are carried out in the following order:

[0034] 1. Make the 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 scale division 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 is opened and installed with a 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...

Embodiment 2

[0058] This example is for image 3 The strength welded pipe-tubesheet 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 tubesheet is welded with 8mm thick surfacing welding. layer, the surfacing layer material is ALLOY 625, and the welding method is electroslag surfacing; the fillet weld groove is an arc groove with a radius of 2.5, and the welding height requirement is 2.5mm. The welding method is automatic argon tungsten arc welding. The pressure difference on both sides of the tube sheet is > 6Mpa, and the outer wall of the connecting tube is a chemical reaction medium, so the sealability and internal quality of the heat exchanger tube-tube sheet fillet welds are required to be high.

[0059] Inspection requirements: (negotiated by the manufacturer and the user) requires that the height limit of the non-penetration of the root be 0.5mm.

[0060] Except for the inner chu...

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Abstract

The invention relates to weld detection and specifically discloses a measurement method for measuring a tube-tube sheet fillet weld incomplete penetration defect height. A measurement system comprisesan X-ray machine, transillumination film and a scale. A ray focus of the X-ray machine is placed in a tube. The transillumination film and the scale are placed outside of a to-be-measured weld in sequence. When the tube ray focus irradiates the to-be-measured weld, an image of an incomplete penetration defect on the to-be-measured weld can be formed on the transillumination film. An image scale value can be read through utilization of the scale. According to the measurement system, the blank that a weld incomplete penetration height control requirement exists and no measurement method existsat home and abroad is filled. Through adoption of the system for measuring the tube-tube sheet fillet weld incomplete penetration defect height, the measurement operation is simple and rapid, a measurement result is true and reliable and is good in consistency. The system has important significance in evaluating whether the incomplete penetration defects exceed a standard or not.

Description

technical field [0001] The invention relates to weld seam measurement, in particular to a system and method for measuring the height of incomplete penetration defects of pipe-tube plate fillet welds. Background technique [0002] With the rapid development of chemical technology, large-scale, complex and high-parameter chemical heat exchanger products continue to emerge, which put forward higher requirements for the reliability of product operation, to ensure that the product can operate reliably under harsh operating conditions, and reduce the unit cost. A key factor in the rate of unplanned downtime is the quality of the heat exchanger tube and tubesheet fillet welds. Frequent leakage of the 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 and seriously affects the service life of the unit. Therefore, only the surface detection of the corner joints between t...

Claims

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Application Information

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Patent Type & Authority Applications(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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