CN212964784U

CN212964784U - Welding seam defect detection auxiliary device

Info

Publication number: CN212964784U
Application number: CN202022247332.3U
Authority: CN
Inventors: 刘康
Original assignee: China Energy Construction Group Beijing Electric Power Construction Co ltd
Current assignee: China Energy Construction Group Beijing Electric Power Construction Co ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2021-04-13
Anticipated expiration: 2030-10-10

Abstract

The utility model discloses a welding seam defect detection auxiliary device, including being used for attached in the magnetic stripe scale on welding seam surface and being fixed in the probe dipperstick on the probe of A type pulse ultrasonic detection instrument through fixture, the probe dipperstick is the ruler. When detecting, firstly the magnetic stripe scale is attached and fixed on the welding seam, one side edge of the magnetic stripe scale is positioned at the central position of the welding seam, then the A-type pulse ultrasonic detector and the probe measuring scale fixed by the probe end of the A-type pulse ultrasonic detector are used for detecting and marking the position, and finally the magnetic stripe scale is matched with the scale mark to calculate the numerical values of the defect such as the transverse position, the longitudinal position and the length of the welding seam. The device can accurately position the length, the transverse position and the longitudinal position of the defect, and the precision reaches millimeter level. The device can unify 0 points of a plurality of defects, the traceability is greatly improved, and the defect recurrence rate reaches 100%.

Description

Welding seam defect detection auxiliary device

Technical Field

The utility model relates to a welding seam defect detects technical field, concretely relates to can improve the welding seam defect detection auxiliary device of precision and efficiency of A type pulse ultrasonic wave nondestructive test technique.

Background

The ultrasonic nondestructive testing technology (UT) is one of five conventional testing technologies, has the characteristics of wide range of tested objects, large testing depth, accurate defect positioning, high testing sensitivity, low cost, convenient use, high speed, no harm to human bodies, convenient field use and the like, and all countries in the world pay high attention to ultrasonic nondestructive testing. The conventional manual A-type pulse detection method is the largest in proportion, and after detecting and finding the lack of reflection echo, all parameters of the reflection echo should be recorded, and the method comprises the following steps: length (L) of the defect, depth (H), amplitude (B), transverse position (D) and longitudinal position (S) of the weld joint, and the like. These parameters all affect the quantitative and qualitative analysis of the defect until the conclusion is reached. After the flaw detector is debugged, the depth and amplitude instrument can be directly read, and the length of the flaw and the transverse position and the longitudinal position of the flaw in a welding seam mainly influence the positioning efficiency and precision.

In the defect positioning at the present stage, a horizontal position parameter is given after an instrument automatically calculates when the highest echo of the defect is found in the detection, an operator measures the projection position of the defect on the surface of the welding seam by using a ruler, then marks the projection position by using a marker pen, then respectively finds out two end point positions of the defect by using a movable probe for marking again, and finally measures the distance between the first position and the 0 point of the welding seam by using a ruler to obtain a longitudinal position (S); obtaining a transverse position (D) of the welding seam from the distance between the first position and the center of the welding seam; the distance between the second and third positions yields the length (L) of the defect. The above steps are repeated when there are a plurality of defects. The following problems exist with this detection tool and approach:

(a) the surface of the welding seam is stained with a coupling agent, and the mark pen is not clear or inaccurate in mark;

(b) the length of the steel plate ruler is not enough, the steel plate ruler cannot be in close contact with the surface of a welding seam, and the error of the longitudinal position (S) is large;

(c) the center of the welding seam can not be accurately positioned, and the transverse position (D) of the welding seam is estimated by visual observation in many times;

(d) during operation, a main inspector holds the instrument with one hand and operates the probe with the other hand, and when a echo is found, an assistant person needs to hold the steel plate ruler for measuring the position, or the assistant person holds the instrument, the main inspector holds the probe and the ruler, and the detection process needs two persons to cooperate in a tacit manner.

The inaccuracy of measurement caused by the above factors will bring about a great influence:

(a) the defect length measurement results are inconsistent for multiple times, and the inaccurate length measurement affects the evaluation (qualification) of the results.

(b) Inaccurate length measurement can influence the conclusion of defect extension monitoring of next detection, and if the length of the length measurement is 12mm, the length of the monitoring detection of the next time is 16mm due to the influence of personnel and methods, the defect is considered to be extended, and the welding seam has a failure risk in a short period. In practice, the possible defects are not spread, but only the error caused by the measurement method, but the error can cause serious misleading to the overall evaluation.

(c) The defects are not accurately positioned in the transverse (left and right central lines) position of the welding line, so that the judgment of the defect property is influenced, and even the defects are possibly missed.

(d) The positioning principle of the defects at the longitudinal position of the welding seam is not uniform (the positions of the defects are expressed by clock points, and the positions of the defects are increased or decreased up, down, left, right, front and back), the positioning is not accurate, the traceability of the defects detected next time is not strong, and the reproducibility is not enough.

With the development of science and technology, modern nondestructive testing gradually transits to nondestructive evaluation. The evaluation presupposes the precise localization and quantification of the defects found. The weld is exactly where and how large the defect is, and the defect can only be evaluated if these parameters are determined. Modern evaluation technology systems are gradually perfected, overproof defects do not represent that the defects need to be repaired immediately or mean that workpieces can be caused to lose effectiveness immediately, influence factors of the defects on welding seams can be obtained through precise positioning and quantification of the defects and strict calculation and evaluation, further the remaining time of the unqualified welding seam safety working condition is determined, the defects are periodically tracked and rechecked within the range, and if the defects are not expanded and other technical measures are added, the safe and stable operation of the workpieces can be guaranteed in a time period. This puts a higher demand on the positioning and quantifying accuracy of the defects, and the accuracy of the traditional positioning method obviously cannot meet the requirements of modern nondestructive evaluation.

SUMMERY OF THE UTILITY MODEL

The invention aims to provide an auxiliary device for detecting weld defects, which is used for assisting an A-type pulse ultrasonic detector to detect the weld defects, can improve the detection efficiency and the detection precision, can be completed by one person and reduces the detection labor cost.

The technical scheme of the utility model is detailed below:

the utility model provides a welding seam defect detection auxiliary device, is including being used for attaching the magnetic stripe scale in the welding seam surface and being fixed in the probe dipperstick on the probe of A type pulse ultrasonic detector through fixture, and the probe dipperstick is the ruler.

Preferably, in the weld defect detection assistance device, a side of the probe measurement ruler is aligned with a center of the probe, i.e., an acoustic beam axis.

Preferably, in the auxiliary device for detecting weld defects, the width of the magnetic stripe scale is 10 mm.

Preferably, the weld defect detection support device is applied to a weld having a width of 20mm or more.

Preferably, in the auxiliary device for detecting weld defects, the magnetic stripe graduated scale is arranged clockwise along the flow direction of the weld medium, so that one side edge of the magnetic stripe graduated scale is located at the center of the weld.

Preferably, in the auxiliary device for detecting weld defects, the probe measuring scale is a steel plate scale; the magnetic stripe graduated scale is a magnetic tape measure.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the defect positioning and quantifying process can be easily completed by one person. The detection efficiency is greatly improved, the clear and complete record is ensured, and the positioning efficiency is improved by more than one time.

(2) The length, the transverse position and the longitudinal position of the defect can be accurately positioned, and the precision reaches millimeter level.

(3) The 0 points of a plurality of defects are unified, the traceability is greatly improved, and the reproduction rate of the defects reaches 100%.

(4) The auxiliary device has the advantages of simple and practical structure, convenient and quick operation and convenient carrying.

Drawings

FIG. 1 is a schematic structural diagram of a weld defect detection auxiliary device;

fig. 2 is a schematic view of a magnetic stripe scale attached to the surface of a weld.

Detailed Description

The technical solution of the present invention will be explained and explained in detail with reference to the accompanying drawings and preferred embodiments, so that those skilled in the art can better understand the present invention and implement the present invention, and the embodiments do not limit the protection scope of the present invention.

Referring to fig. 1, a welding seam defect detection auxiliary device is disclosed, which is used in cooperation with an a-type pulse ultrasonic detector, and includes a probe measuring scale fixedly mounted on a probe of the a-type pulse ultrasonic detector through a fixture, and a magnetic stripe scale attached to the surface of a welding seam.

Wherein, the magnetic stripe scale is the magnetism tape measure, can bend, 10mm width, when attached fixed, the magnetic stripe scale should flow to clockwise along the welding seam medium and arrange, and the starting point of magnetic stripe scale is fixed in the 0 point position of welding seam, and this position should be made such as the permanent sign of mode such as beat steel seal, and the 0 point position can be traceed back in the follow-up reinspection of being convenient for next time. The length direction side edges of the magnetic stripe graduated scale are aligned with the center line of the welding seam, as shown in figure 2.

The probe dipperstick is the steel sheet ruler, or the ruler of other materials, during fixed mounting, with 0 point pair its probe forward position of probe dipperstick, the side of probe dipperstick and probe center (acoustic beam axis) are to it, and the surplus of welding seam surplus height and the surplus about 5mm of the thickness of magnetic stripe scale is left with the work piece surface in bottom.

During detection, the maximum echo is found after a defect is found, the direct depth (H), the amplitude (B) and the horizontal position from the front edge of the probe to the defect, such as 85mm, are given by the A-type pulse ultrasonic detector, the scale position of a probe measuring scale on the probe is observed at the moment, and the difference value between the scale position and the side edge (the center position of a welding seam) of a magnetic stripe scale on the surface of the welding seam is the transverse position (D) of the defect on the welding seam; the overlapping position of the side edge of the probe measuring scale and the scale of the magnetic stripe graduated scale is that the defect is in the longitudinal position (S) of the welding seam, such as 365 mm; then, the probe is moved along the length direction of the defect to find end points on two sides of the defect, and longitudinal positions such as 358mm and 373mm are recorded, and the difference value of the two positions is the length (L) of the defect, namely 15 mm.

The width of a weld joint needing ultrasonic detection on site is basically over 20mm, a magnetic stripe graduated scale with the width of 10mm can meet the requirement, and the weld joint can be aligned to trim the width if needed. More than nine objects of field inspection are ferromagnetic materials, and the magnetic stripe graduated scale can be fixed on the surface of a welding seam by using double faced adhesive tape on the inspection side of the nonmagnetic material. Spot 0 confirmation may be written in the inspection report, such as right above or right in front of the location, in preparation for the steel seal marking to be unclear or disappear. The probe measuring scale fixed on the probe selects different lengths according to the thickness of the detected workpiece, and is convenient and portable.

By the aid of the simple and practical auxiliary detection device, the unification of 0 points of multiple defects can be guaranteed, traceability is greatly improved, and defect recurrence rate reaches 100%; the length, the transverse position and the longitudinal position of the defect can be accurately positioned, and the precision reaches a millimeter level; the detection process can be easily finished by one person, the detection efficiency is greatly improved, the clear and complete record can be ensured, and the positioning efficiency is improved by more than one time.

The inventive concept is explained in detail herein using specific examples, and the above description of the embodiments is only used to help understand the core idea of the present invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a welding seam defect detection auxiliary device which characterized in that, is including being used for attached in the magnetic stripe scale on welding seam surface and being fixed in the probe dipperstick on the probe of A type pulse ultrasonic detector through fixture, and the probe dipperstick is the ruler.

2. The weld defect detection assistance device of claim 1, wherein the sides of the probe measurement ruler are aligned with the probe center, i.e., the acoustic beam axis.

3. The weld defect detection assistance device of claim 1, wherein the magnetic stripe scale is 10mm wide.

4. The weld defect detection assisting device according to claim 1, being applied to a weld having a width of 20mm or more.

5. The weld defect detection auxiliary device according to claim 1, wherein the magnetic stripe graduated scale is arranged clockwise along the weld medium flow direction, so that one side edge of the magnetic stripe graduated scale is positioned at the center of the weld.

6. The weld defect detection auxiliary device according to claim 1, wherein the probe measuring scale is a steel plate scale; the magnetic stripe graduated scale is a magnetic tape measure.