CN113376259B - Be used for full-automatic ultrasonic testing reference block of thick wall circumferential weld - Google Patents

Be used for full-automatic ultrasonic testing reference block of thick wall circumferential weld Download PDF

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Publication number
CN113376259B
CN113376259B CN202110506507.4A CN202110506507A CN113376259B CN 113376259 B CN113376259 B CN 113376259B CN 202110506507 A CN202110506507 A CN 202110506507A CN 113376259 B CN113376259 B CN 113376259B
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area
welding
groove
bottom hole
flat
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CN113376259A (en
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黄磊
李亮
李汝江
李为卫
张鸿博
刘琰
姚欢
周益
孙少卿
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Beijing Longshine Oil Tubular Technology Co ltd
China National Petroleum Corp
CNPC Tubular Goods Research Institute
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Beijing Longshine Oil Tubular Technology Co ltd
China National Petroleum Corp
CNPC Tubular Goods Research Institute
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Abstract

The invention discloses a full-automatic ultrasonic detection reference block for a thick-wall circumferential weld, which comprises the following parts in an upstream area and a downstream area: a root welding area notch groove is formed in the position corresponding to the root welding area of the welding line; a truncated region flat bottom hole is arranged at the position corresponding to the welding seam truncated region; a flat bottom hole of the hot welding zone is arranged at the position corresponding to the hot welding zone of the welding seam; filling area flat bottom holes are respectively formed in the positions corresponding to the filling areas of all layers of the welding seams; a cover surface area notch groove is formed in the position corresponding to the welding seam cover surface area; a plurality of volume channel flat bottom holes are arranged; a TOFD channel is opened. According to the invention, different artificial defects are designed on the reference block body, so that the defects of cracks, unfused welding heads, air holes and the like in a root welding area, a blunt edge area, a hot welding area, a filling area and a cover surface area can be simulated, and the problem of quantitative evaluation and evaluation of the defects in the AUT detection of the thick-wall circumferential weld is solved.

Description

Be used for full-automatic ultrasonic testing reference block of thick wall circumferential weld
Technical Field
The invention belongs to the technical field of nondestructive testing, and relates to a reference block for thick-wall girth weld AUT (automated ultrasonic testing) testing.
Background
The full-automatic ultrasonic inspection (AUT) is to divide a welding seam into a plurality of areas along the thickness direction, each area is inspected by one pair or two pairs of focusing probes (sound beams), and meanwhile, the non-focusing probes (sound beams) are also adopted for inspection, so that a multi-channel inspection system is required; the detection result is displayed in an image form and is divided into three display modes of A scanning, B scanning and ultrasonic diffraction wave time difference; the scanner adopts automatic scanning and automatic acoustic coupling in the circumferential direction of the pipeline, comprehensively detects the subareas in the thickness direction of the whole welding seam, and automatically displays the detection result and the acoustic coupling on an image.
The detection principle is as follows: the partition method is to divide the welding seam into a plurality of areas along the thickness direction; each zone is detected by one or two pairs of focusing probes (sound beams) and simultaneously detected by non-focusing probes (sound beams); the scanning device scans the circumferential direction of the pipeline for a circle, and can comprehensively detect the subareas in the thickness direction of the whole welding line. The area division is to divide the detected welding seam into a plurality of areas according to the detection requirement. The area division of the welding seam is carried out according to the groove parameters and the welding filling times of the welding seam, and the welding seam filling times with different thicknesses are different, so that the subareas are also different. Fig. 1 is a typical weld zone for a phi 559mm x 31.8mm girth weld, which is a welding zone that may not be the same as, but sometimes may be the same as, a detection zone. According to the wall thickness of the circumferential weld, the whole weld area can be divided into a Root zone (Root), a blunt edge zone (LCP), a hot welding zone (HP) and a filling zone (9 zones: F) 1 、F 2 、F 3 、F 4 、F 5 、F 6 、F 7 、F 8 And F 9 ) And a Cap area (Cap) capable of detecting defects such as cracks, unfused, incomplete penetration, pores and the like in the welding seam.
The principle of the partition is determined according to the detection standard and specification, generally, the height of each partition is 1 mm-3 mm, the thinner the partition height is, the better the defect quantification is, and the more accurate the defect quantification is. The height of the subarea is not easy to be too large, the subarea is too large and easy to miss detection, and the subarea is not easy to be too smallToo small debugging difficulty, generally minimum 1mm, maximum 3mm, also can be greater than 3mm, and it is decided according to the detection needs, fig. 2 is the detection subregion of welding seam, according to the girth weld wall thickness condition, can divide into Root with whole detection area height in proper order: 1mm, LCP: 2mm, HP: 1.97mm, F 1 ：2.87mm、F 2 ：2.87mm、F 3 ：2.87mm、F 4 ：2.87mm、F 5 ：2.87mm、F 6 ：2.87mm、F 7 ：2.87mm、F 8 ：2.87mm、F 9 ：2.87mm、Cap：1mm。
Therefore, defects (such as cracks, unfused, incomplete penetration, air holes and the like) existing in the thick-wall girth welding seam (such as the specification phi 559mm multiplied by 31.8mm) can be effectively detected, detection partitioning is carried out according to the wall thickness, and a reference block and artificial defects are designed and compared, so that the quality can be effectively controlled, and the operation risk of the pipeline is reduced. Therefore, it is very necessary to design a reference block for detecting the thick-wall girth weld AUT.
Disclosure of Invention
The invention provides a full-automatic ultrasonic detection reference block for a thick-wall girth weld, which solves the problem of quantitative evaluation of the defect of the thick-wall girth weld AUT detection.
The technical scheme adopted by the invention is as follows:
a full-automatic ultrasonic detection reference block for a thick-wall circumferential weld comprises a reference block body, wherein the reference block body comprises an upstream area and a downstream area;
in the upstream and downstream regions: a root welding area notch groove is formed in the position corresponding to the root welding area of the welding line, and the root welding area notch groove is consistent with the root bevel face of the welding line; a truncated region flat bottom hole is arranged at a position corresponding to the welding seam truncated region, and the truncated region flat bottom hole is vertical to the truncated edge; a hot welding zone flat-bottom hole is formed in the position corresponding to the hot welding zone of the welding line, and an included angle between the hot welding zone flat-bottom hole and the thickness direction of the reference test block body is 44-46 degrees; filling area flat bottom holes are respectively formed in the positions corresponding to the filling of each layer of the welding line, and the filling area flat bottom holes of each layer of the filling area are consistent with the bevel angles corresponding to each layer of the filling area; a cover surface area notch groove is formed in the position corresponding to the welding seam cover surface area; a plurality of volume channel flat-bottom holes are formed, included angles between the volume channel flat-bottom holes and the comparison test block body in the thickness direction are 44-46 degrees, and the positions of the volume channel flat-bottom holes in the thickness direction of the comparison test block body are different; a TOFD channel is arranged;
the TOFD channel of the upstream area is inwards opened from one side surface of the reference block body, and the TOFD channel of the downstream area is inwards opened from the other side surface of the reference block body.
Preferably, the depth of the root welding zone notch meets the requirement of the detection sensitivity of the transducer, and the length of the welding zone notch is not less than the width of the transducer;
the depth of the cover surface area groove meets the requirement of the detection sensitivity of the transducer, and the length of the welding area groove is not less than the width of the transducer.
Preferably, the diameter of the flat bottom hole of the truncated area is 2 mm-3 mm.
Preferably, the diameter of the flat bottom hole of the hot welding zone is 2 mm-3 mm.
Preferably, the diameter of the flat bottom hole of the filling area is 2 mm-3 mm.
Preferably, the height of each layer of filling area is 2.5 mm-3.5 mm.
Preferably, the diameter of the volume channel flat-bottom hole is 1.3-1-7mm, and the volume channel flat-bottom hole is formed in the comparison test block body every eighth of the thickness of the comparison test block body in the thickness direction.
Preferably, the TOFD channel of the upstream area is a groove, the groove is in a V-shaped square groove at the bottom, the length of the groove is 10-15 mm, the width of the groove is 0.8-1.2mm, the depth of the groove is 45-75% of the thickness of the reference test block body, and the angle of the V-shaped bottom of the groove is 59-61 degrees;
the TOFD channel of the downstream area is a groove, the shape of the groove is a square groove with a V-shaped bottom, the length of the groove is 10-15 mm, the width of the groove is 0.8-1.2mm, the depth of the groove is 2.8-3.2mm, and the angle of the V-shaped bottom of the groove is 60 degrees.
Preferably, the thickness of the reference block body is 28.0mm-35.2 mm.
Preferably, the shape of reference test block body is a planar Z shape, and in the upper reaches region and the lower reaches region, capping district cutting groove, root welding district cutting groove, TOFD passageway, volume passageway flat bottom hole, blunt edge district flat bottom hole, hot welding district flat bottom hole and filling area flat bottom hole distribute from the middle part of reference test block body to limit portion in proper order. In the upstream region or the downstream region, the interval between the cover surface region notch groove and the root welding region notch groove, the interval between the root welding region notch groove and the TOFD channel, the interval between the TOFD channel and the volume channel flat-bottom hole, the interval between the volume channel flat-bottom holes, the interval between the volume channel flat-bottom hole and the blunt surface region flat-bottom hole, the interval between the blunt surface region flat-bottom hole and the hot welding region flat-bottom hole, the interval between the hot welding region flat-bottom hole and the filling region flat-bottom hole and the interval between the filling region flat-bottom holes meet the requirement that the annular interval of the artificial reflector enables the display signal to reach an independent degree, and adjacent reflectors cannot interfere with each other.
The invention has the following beneficial effects:
the full-automatic ultrasonic detection contrast test block for the thick-wall circumferential weld disclosed by the invention has the advantages that different artificial defects (such as capping area notch grooves, root welding area notch grooves, TOFD channels, volume channel flat-bottom holes, truncated edge area flat-bottom holes, hot welding area flat-bottom holes and filling area flat-bottom holes) are designed on the contrast test block body, the defects of cracks, unfused welding, non-welding heads and air holes in the root welding area, the truncated edge area, the hot welding area, the filling area and the capping area are simulated by using the artificial defects, and the quantitative evaluation and evaluation of the defects in the AUT detection of the thick-wall circumferential weld are solved.
Drawings
FIG. 1 is a weld joint weld zone view;
FIG. 2 is a weld inspection zoning map;
FIG. 3 is a diagram of an arrangement of artificial reflectors of a comparative test block according to the present invention; wherein: upstream for Upstream and Downstream for Downstream. F9-F1 are sequentially a ninth layer filling area, an eighth layer filling area, a seventh layer filling area, a sixth layer filling area, a fifth layer filling area, a fourth layer filling area, a third layer filling area, a second layer filling area and a first layer filling area. HP is the hot welding zone. LCP is a blunt edge zone. V4-V1 are a fourth volume channel, a third volume channel, a second volume channel and a first volume channel in sequence. TOFDD is the inner TOFD tank and TOFDD is the outer TOFD tank. Root is Root zone and Cap zone.
FIG. 4 is a diagram of grooves carved in the root region of a reference block according to the present invention; root is the Root zone.
FIG. 5 is a drawing of a blunt-edged flat-bottomed hole in a comparative test block of the present invention; LCP is a blunt edge area; FBH is a flat bottom hole.
FIG. 6 is a diagram of a hot-welded zone flat bottom hole in a comparative test block according to the present invention; HP is a blunt edge region; FBH is a flat bottom hole.
FIG. 7 is a view of a flat bottom hole in the hot weld 1 zone of a comparative test block of the present invention; f 1 Is a hot weld 1 zone; FBH is a flat bottom hole.
FIG. 8 is a view of a flat bottom hole in the hot weld 2 zone of a comparative test block of the present invention; f 2 Are hot weld 2 zones; FBH is a flat bottom hole.
FIG. 9 is a view of a flat bottom hole in the hot weld 3 zone of a comparative test block of the present invention; f 3 Are hot weld 3 zones; FBH is a flat bottom hole.
FIG. 10 is a view of a flat bottom hole in the hot welded 4 zone of a comparative test block of the present invention; f 4 A hot weld 4 zone; FBH is a flat bottom hole.
FIG. 11 is a view of a flat bottom hole in the hot weld 5 zone of a comparative test block of the present invention; f 5 A hot welding 5 zone; FBH is a flat bottom hole.
FIG. 12 is a view of a flat bottom hole in a hot weld 6 zone of a comparative test block of the present invention; f 6 Are hot weld 6 zones; FBH is a flat bottom hole.
FIG. 13 is a view of a flat bottom hole in the hot weld 7 zone of a comparative test block of the present invention; f 7 Are hot weld 7 zones; FBH is a flat bottom hole.
FIG. 14 is a view of a thermally welded 8 zone flat bottom hole in a comparative test block of the present invention; f 8 Are hot weld 8 zones; FBH is a flat bottom hole.
FIG. 15 is a view of a flat bottom hole in the hot weld 9 zone of a comparative test block of the present invention; f 9 A hot weld 9 zone; FBH is a flat bottom hole.
FIG. 16 is a diagram of a notch in the cap region of a comparative test block according to the present invention; cap is the Cap area.
FIG. 17 is a drawing of a flat bottom hole in the area of volume channel 1 in a comparative test block of the present invention; v 1 Is a volume channel 1 region; FBH is a flat bottom hole.
FIG. 18 is a drawing of a flat bottom hole in the 2 region of the volumetric channel in a comparative test block according to the invention; v 2 Is a volume channel 2 area; FBH is a flat bottom hole.
FIG. 19 shows a reference block of the present inventionA flat bottom hole pattern of the channel 3 region; v 3 Is a volume channel 3 area; FBH is a flat bottom hole.
FIG. 20 is a drawing of a flat bottom hole in the 4 region of the volume channel of a comparative test block of the present invention; v 4 Is a volume channel 4 area; FBH is a flat bottom hole.
FIG. 21 is a graph of the grooves on the inner surface of the TOFD channel in a comparative test block of the present invention;
FIG. 22 is a graph of the outer surface of the TOFD channel of the comparative test block of the present invention.
In the figure, 1-welding root zone, 2-blunt edge zone, 3-hot welding zone, 4-first layer filling zone, 5-second layer filling zone, 6-third layer filling zone, 7-fourth layer filling zone, 8-fifth layer filling zone, 9-sixth layer filling zone, 10-seventh layer filling zone, 11-eighth layer filling zone, 12-ninth layer filling zone, 13-cover layer, 14-crack, 15-unfused, 16-unwelded, 17-air hole, 18-TOFD inner groove and 19-TOFD outer groove.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
The sound permeability, sound velocity, sound attenuation and the like of the reference block material should be the same as or similar to the detected workpiece as much as possible. Generally, the material of the reference block is as same as or close to the workpiece to be tested as possible. The manufacturing process can ensure the uniformity of the material, no impurity and no defect affecting the use. The shape of the reference block is as simple as possible and can represent the characteristics of the detected workpiece; the thickness of the reference block is corresponding to the thickness of the detected workpiece; the roughness of the reference block is the same as or similar to that of the workpiece. If two or more different thicknesses of sheet material are involved, the thickness of the reference block should be determined or calculated from the maximum thickness it detects.
The design of the type, the angle and the depth of the artificial reflector on the reference block is determined according to the wall thickness of a workpiece to be detected, the type of a welding seam groove and the size of the groove. The common artificial reflectors for the circumferential weld comprise a flat-bottom hole, a flat-bottom groove, a V-shaped groove and the like, and are mainly used for simulating the defects of cracks, unfused parts, non-welding heads, air holes and the like in the weld. The artificial defects are used for adjusting the detection proportion and the detection range, measuring a distance amplitude curve, adjusting the detection sensitivity, carrying out quantitative evaluation on the defects, verifying the scanning coverage rate, the dynamic detection capability and the reliability of the system and the like.
Referring to fig. 3-22, the invention is used in the full-automatic ultrasonic detection reference block for the thick-wall girth weld:
adopting a notch groove (namely a notch groove of a root welding area) with the depth meeting the detection sensitivity and the length not less than the width and the direction of the transducer consistent with the root bevel face in the root area;
the blunt edge area adopts a flat bottom hole (the diameter is 2 mm-3 mm) with a certain size and the direction is vertical to the blunt edge;
the hot welding area adopts a flat bottom hole (the diameter is 2 mm-3 mm) with a certain size, and the direction of the flat bottom hole and the central line form an angle of 44-46 degrees;
the filling area adopts a flat bottom hole (the diameter is 2 mm-3 mm) with a certain size, the direction is consistent with the angle of the groove, and the height of the area of the filling area is usually 2.5 mm-3.5 mm, which is similar to the height of the welding layer. Flat bottom holes with a diameter of 3mm are usually used as target reflectors when the wall thickness is equal to or greater than 15 mm. A flat bottom hole should be provided in the center of each partition;
the cover surface area adopts a notch groove (namely a cover surface area notch groove) with the depth meeting the detection sensitivity and the length not less than the width and the direction of the transducer and consistent with the bevel surface;
the volume channels are defined by a flat-bottom hole (1.5 mm diameter) of a certain size and oriented at 44-46 deg. to the central line, and the number of volume channels is generally determined by dividing the wall thickness by 8.
7. The TOFD verification groove is provided with a sharp-angle square groove with the length of 10-15 mm, the width of 1mm, the depth of 60% T (T is the wall thickness) and the sharp angle of 60 degrees on the inner surface, and the result calculated by the depth of 60% T is an integer [ N ] downwards. The outer surface is provided with a sharp-angle square groove with the length of 10 mm-15 mm, the width of 1mm, the depth of 3.0mm and the sharp angle of 60 degrees, and the depth is independent of the wall thickness and is a fixed value. The sharp-angle-shaped square groove is a square groove with a V-shaped bottom, and the angle of the sharp angle is the angle of the V-shaped apex angle.
Examples
In this embodiment, the structure of the reference block is described by taking an example of the specification of Φ 559mm × 31.8mm, and the principle of designing the reference block mainly follows the following:
first, the test block is designed symmetrically from the root part to the upper part along the bevel (i.e. the upstream area and the downstream area in the invention, taking fig. 3 as an example, the upstream area is the left area of the vertical dotted line in fig. 3, and the downstream area is the right area of the vertical dotted line in fig. 3). The artificial reflectors are distributed as follows: root artificial reflectors, blunt artificial reflectors, hot weld zone artificial reflectors, fill zone artificial reflectors, cap surface grooves, volume channel artificial reflectors, central through holes or grooves. Additional artificial reflectors (TOFD validation tank);
the types of artificial reflectors commonly used are: root welding zone-groove with 10 mm-15 mm length along the root bevel face; blunt edge zone (LCP) -flat bottom hole, the hole bottom surface is consistent with the bevel face; hot welding area-flat bottom hole, the bottom surface of the hole is 45 degrees; filling area-flat bottom hole, the bottom surface of the hole is consistent with the bevel face; a cap area is a groove with an angle of 0-15 degrees, which is positioned in the filling area and is close to the upper surface, along the direction of the central line of the welding line; volume type target reflector-flat bottom hole; TOFD verification groove-V type groove (60 degree)
And thirdly, all reflectors on the reference block correspond to different detection beams, all the detection beams correspond to artificial reflectors, and the signal interference of adjacent artificial reflectors in the vertical direction is limited within a certain range.
Design of reference block and selection of artificial defect
According to the principle, the thick-wall circumferential weld AUT detection reference block is designed. The root of an artificial reflector in the reference block is a notch groove with a certain size, the depth of the groove is required to meet the requirement of detection sensitivity, the length is not less than the width of the transducer, and the angle of the groove is consistent with the angle of the root groove; the blunt edge area is a flat bottom hole with a certain angle, and the position of the flat bottom hole is vertical to the blunt edge; the hot welding area is a flat-bottom hole with a certain angle, and the position of the flat-bottom hole forms an angle of 45 degrees with the central line; the artificial reflector in the filling area is a flat-bottom hole with a certain size, the angle of the artificial reflector is consistent with the angle of the groove, and the height of the area of the filling area is usually 2.5-3.5 mm, which is close to the height of the welding layer; the cover surface area is a certain notch, the depth of the notch meets the requirement of detection sensitivity, the length is not less than the width of the transducer, and the angle is consistent with the angle of the bevel surface. A2 mm through hole is made at the central line position between the upstream and the downstream of the reference block so as to verify that the length of the arranged gate is enough to cover a welding line and ensure the detectability of defects near the central line. In addition, an additional artificial reflector is designed on the reference block, the volume channel artificial defect is a flat-bottom hole with the diameter of 1.5mm, the angle is 45 degrees, the volume channel artificial defect is distributed on a central line, the number is generally that the wall thickness is divided by a coefficient of 8, and the obtained numerical value is rounded; the TOFD verification groove on the inner surface and the outer surface is a V-shaped groove with a certain size, the depth of the groove is not less than the blind areas on the upper surface and the lower surface of TOFD detection, the angle is 60 degrees, and the sizes of the blind areas on the upper surface and the lower surface of TOFD detection are verified. Fig. 3 is a layout diagram of an artificial reflector of a thick-wall circumferential weld AUT detection reference block, which is specifically as follows:
(1) the angles of the artificial groove designed in the root area in the reference block are consistent with the angle of the root groove. The notch size is length x depth x width (15mm x 1mm x 2mm), the angle is 0 ° for simulating root lack of penetration or fusion, the size position is shown in fig. 4;
(2) the flat bottom hole designed in the blunt edge area in the reference block is vertical to the blunt edge. The diameter of the flat bottom hole is 3mm, the flat bottom hole is used for simulating the incomplete penetration of the blunt edge area, and the size and the position are shown in figure 5;
(3) the flat bottom hole designed in the hot welding area of the reference block forms an angle of 45 degrees with the central line. The flat bottom hole diameter was 3mm to simulate a hot welded area unfused, the dimensional position shown in fig. 6;
(4) the flat bottom hole designed in the first layer filling area 4 in the reference block is vertical to the bevel face and forms 2.5 degrees with the central line. A flat bottom hole of 3mm diameter was used to simulate the unfused first layer fill area 4, the dimensional position shown in figure 7;
(5) the flat-bottom hole designed in the second layer of filling area 5 in the reference block is perpendicular to the bevel face and forms 2.5 degrees with the central line. A flat bottom hole of 3mm diameter was used to simulate the unfused second layer fill area 5, the dimensional position shown in figure 8;
(6) the flat bottom hole designed in the third layer of filling area 6 in the reference block is vertical to the bevel face and forms 2.5 degrees with the central line. A flat bottom hole of 3mm diameter was used to simulate the unfused third layer fill area 6, the dimensional position shown in figure 9;
(7) the flat bottom hole designed in the fourth layer of filling area 7 in the reference block is vertical to the bevel face and forms 2.5 degrees with the central line. A flat bottom hole of 3mm diameter was used to simulate the fourth layer of infill 7 unfused, the dimensional position shown in figure 10;
(8) the flat-bottom hole designed in the fifth filling area 8 in the reference block is vertical to the bevel face and forms 2.5 degrees with the central line. A flat bottom hole of 3mm diameter was used to simulate the unfused fifth layer fill 8, the size location shown in fig. 11;
(9) the flat bottom hole designed in the sixth layer of filling area 9 in the reference block is perpendicular to the bevel face and forms 2.5 degrees with the central line. A flat bottom hole of 3mm diameter was used to simulate the sixth layer of infill 9 unfused, the dimensional position shown in figure 12;
(10) the flat bottom hole in the seventh layer of filling area 10 in the reference block is perpendicular to the bevel face and forms 2.5 degrees with the center line. A flat bottom hole of 3mm diameter was used to simulate the unfused of the seventh layer fill area 10, the dimensional position shown in fig. 13;
(11) the flat-bottom hole designed in the eighth layer of filling area 11 in the reference block is perpendicular to the bevel face and forms 2.5 degrees with the central line. A flat bottom hole of 3mm diameter was used to simulate the lack of fusion in the eighth layer of fill 11, the dimensional position shown in fig. 14;
(13) the flat bottom hole in the ninth layer of filling area 12 in the reference block is perpendicular to the bevel face and forms 2.5 degrees with the central line. A flat bottom hole of 3mm diameter was used to simulate the ninth layer of filled areas 12 not fused, the dimensional position being shown in fig. 15;
(14) the angle of the manual notch groove designed on the cover surface area in the reference block is consistent with the angle of the bevel groove of the cover surface area. The notch dimensions were length x depth x width (15 x 1 x 2) and angle 2.5 ° for simulating an external surface undercut or surface unfused, the dimensional positions being shown in fig. 16;
(15) the flat bottom hole designed in the volume channel 1 in the control block is at 45 ° to the centerline. The diameter of the flat bottom hole is 1.5mm, and the flat bottom hole is used for simulating the volume defects of air holes and slag inclusion in the area of the volume channel 1, and the size and the position are shown in figure 17;
(16) the flat bottom hole designed in the volume channel 2 in the control block is at 45 ° to the centerline. The diameter of the flat bottom hole is 1.5mm, and the flat bottom hole is used for simulating the volume defects of air holes and slag inclusion in the area of the volume channel 2, and the size and the position are shown in figure 18;
(17) the flat bottom hole designed in the volume channel 3 in the control block is at 45 ° to the centerline. The diameter of the flat bottom hole is 1.5mm, and the flat bottom hole is used for simulating the volume defects of air holes and slag inclusion in the area of the volume channel 3, and the size and the position are shown in figure 19;
(18) the flat bottom hole designed in the volume channel 4 in the control block is at 45 ° to the centerline. The diameter of the flat-bottom hole is 1.5mm, the flat-bottom hole is used for simulating the volume defects of air holes and slag inclusion in the area 4 of the volume channel, and the size and the position are shown in figure 20;
(19) the inner surface of the design in the TOFD channel in the control block was validated against the groove. The groove dimensions were length X depth X width (15mm X2 mm X1 mm) and the angle was 60 ° For verifying the blind zone under TOFD detection, the size and position are shown in FIG. 21;
(20) the outer surface validation groove designed in the TOFD channel in the test block. The slot dimensions are length x depth x width (15mm x 3mm x 1mm) and angle 60 deg. for verifying the dead zone on the TOFD test, the dimensions are shown in fig. 22.
According to the invention, through the design of the thick-wall girth weld AUT detection reference block, the defects of cracks, unfused, non-welding heads, air holes and the like in a root welding area, a blunt edge area, a hot welding area, a filling area and a cover surface area are simulated by using artificial defects (such as a flat bottom hole, a flat bottom groove, a V-shaped groove and the like), and the quantitative evaluation and evaluation of the defects in the thick-wall girth weld AUT detection are solved.

Claims (2)

1. A full-automatic ultrasonic detection reference block for a thick-wall circumferential weld is characterized by comprising a reference block body, wherein the reference block body comprises an upstream area and a downstream area;
in the upstream and downstream regions: a root welding area notch groove is formed in the position corresponding to the root welding area of the welding line, and the root welding area notch groove is consistent with the root bevel face of the welding line; a truncated region flat bottom hole is arranged at a position corresponding to the welding seam truncated region, and the truncated region flat bottom hole is vertical to the truncated edge; a hot welding zone flat-bottom hole is formed in the position corresponding to the hot welding zone of the welding line, and an included angle between the hot welding zone flat-bottom hole and the thickness direction of the reference test block body is 44-46 degrees; filling area flat bottom holes are respectively formed in the positions, corresponding to the filling areas, of each layer of the welding seam, and the angle of the filling area flat bottom hole of each layer of the filling area is consistent with that of the groove corresponding to each layer of the filling area; a cover surface area notch groove is formed in the position corresponding to the welding seam cover surface area; a plurality of volume channel flat-bottom holes are formed, included angles between the volume channel flat-bottom holes and the reference block body in the thickness direction are 44-46 degrees, and the positions of the volume channel flat-bottom holes in the thickness direction of the reference block body are different; a TOFD channel is arranged;
the TOFD channel of the upstream area is inwards opened from one side surface of the reference block body, and the TOFD channel of the downstream area is inwards opened from the other side surface of the reference block body;
the depth of the root welding zone notch meets the requirement of the detection sensitivity of the transducer, and the length of the root welding zone notch is not less than the width of the transducer;
the depth of the cover surface area groove meets the requirement of the detection sensitivity of the transducer, and the length of the welding area groove is not less than the width of the transducer;
the diameter of the flat bottom hole of the truncated edge region is 2 mm-3 mm;
the diameter of the flat bottom hole of the hot welding zone is 2-3 mm;
the diameter of the flat bottom hole of the filling area is 2-3 mm;
the height of each layer of filling area is 2.5 mm-3.5 mm;
the diameter of the volume channel flat-bottom hole is 1.3-1-7mm, and volume channel flat-bottom holes are formed in the comparison test block body every eighth of the thickness of the comparison test block body in the thickness direction;
the TOFD channel in the upstream area is a groove, the groove is in a shape of a square groove with a V-shaped bottom, the length of the groove is 7 degrees and is 10-15 mm, the width of the groove is 0.8-1.2mm, the depth of the groove is 45% -75% of the thickness of the reference test block body, and the angle of the V-shaped bottom of the groove is 59-61 degrees;
the TOFD channel of the downstream area is a groove, the shape of the groove is a square groove with a V-shaped bottom, the length of the groove is 10-15 mm, the width is 0.8-1.2mm, the depth is 2.8-3.2mm, and the angle of the V-shaped bottom of the groove is 59-61 degrees;
the thickness of the comparison test block body is 28.0mm-35.2 mm.
2. The full-automatic ultrasonic testing reference block for the thick-wall girth weld of claim 1, wherein the shape of the reference block body is a planar Z shape, and in the upstream area and the downstream area, the cap area notch groove, the root welding area notch groove, the TOFD channel, the volume channel flat-bottom hole, the truncated zone flat-bottom hole, the hot welding area flat-bottom hole and the filling area flat-bottom hole are distributed from the middle part to the edge part of the reference block body in sequence.
CN202110506507.4A 2021-05-10 2021-05-10 Be used for full-automatic ultrasonic testing reference block of thick wall circumferential weld Active CN113376259B (en)

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