Method for detecting incomplete root penetration of butt weld of thick-walled pipe in ferrite

A technology of butt weld and incomplete penetration, which is applied to the analysis of solids, materials, and instruments using sonic/ultrasonic/infrasonic waves. It can solve the problems of cumbersome operation and incomplete application, and achieve the effect of avoiding missed judgments and accurate judgments.

Active Publication Date: 2016-10-26
HUADIAN ELECTRIC POWER SCI INST CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

This technical solution needs to compare three test blocks, and the actual operation is cumbersome, and the main detection object is thin-walled pipes, which cannot be fully applied in this field

Method used

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  • Method for detecting incomplete root penetration of butt weld of thick-walled pipe in ferrite
  • Method for detecting incomplete root penetration of butt weld of thick-walled pipe in ferrite
  • Method for detecting incomplete root penetration of butt weld of thick-walled pipe in ferrite

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Embodiment

[0028] The detection method of this embodiment requires a digital ultrasonic detector, which uses a high-frequency transverse wave oblique probe and a high-frequency longitudinal wave straight probe. For on-site installation or in-service butt girth welding, single-sided welding and double-sided forming can only be performed on one side. Qualitative and quantitative detection of incomplete penetration of the root during detection, the specific steps are as follows:

[0029] (1) Adjust the sensitivity parameters of the high-frequency shear-wave oblique probe according to the standard requirements; use the high-frequency shear-wave oblique probe to find the maximum reflection signal at the part of the root weld that exceeds the standard;

[0030] (2) Use a qualified steel ruler to locate the maximum reflection signal at the exceeding standard in the horizontal direction and vertical depth, and record the detection data, the horizontal distance L1, the vertical depth H1, and the d...

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Abstract

The invention discloses a method for detecting the incomplete root penetration of a butt weld of a thick-walled pipe in ferrite, and belongs to the field of ultrasonic flaw detection nondestructive testing. The method for detecting the incomplete root penetration comprises the steps that firstly, a transverse wave high-frequency angle probe is utilized for carrying out qualitative analysis on incomplete penetration reflected waves; then excess weld metal of the weld at the horizontal flaw locating position is ground and polished to be in the same horizontal plane with a base metal; finally, a high-frequency longitudinal wave normal probe is used for carrying out qualitative and quantitative analysis determination on the incomplete root penetration. According to the method, the incomplete root penetration of the butt weld of the thick-walled pipe in the ferrite is precisely judged, and meanwhile the method can be used for the incomplete root penetration of a thick plate, a pressure container and the like in the ferrite in a reference mode.

Description

technical field [0001] The invention relates to a method for detecting incomplete penetration of the butt weld root of a ferrite medium-thick-wall pipe, and belongs to the field of ultrasonic flaw detection and non-destructive testing. Background technique [0002] With the rapid growth of the national economy in the past ten years, industries such as electric power and petrochemical industry have developed extremely rapidly. Ferrite medium-thick-walled pipes are widely used in electric power, petrochemical and other industries, and are mostly used to transport high-temperature, high-pressure, flammable, explosive, highly toxic and corrosive media. The on-site butt welds of ferrite medium-thick-walled pipes in thermal power plants generally adopt the welding method of TIG welding for the bottom, SMAW welding for the cover surface, and single-sided welding and double-sided forming. Due to the tight installation schedule and poor working environment of the on-site pipeline, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/0234G01N2291/2675
Inventor 朱海宝向斌郭延军王万明石岩王玉科高国宏
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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