CN110006995B - Phased array ultrasonic detection method for welding seam of metal thick plate with gradient acoustic velocity non-uniformity - Google Patents
Phased array ultrasonic detection method for welding seam of metal thick plate with gradient acoustic velocity non-uniformity Download PDFInfo
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Abstract
The phased array ultrasonic detection method for the welding seam of the metal thick plate with the gradient sound velocity non-uniform comprises the following steps: s1: preparing a calibration test block, wherein a plurality of transverse through holes with different depths are formed in the calibration test block; s2: selecting a type by an inclined probe; s3: respectively sector-scanning different physical depths D on single calibration test block by phased array ultrasonic technology p And obtaining the angle theta and the sound path S from the incidence point of the corresponding oblique probe to the transverse through hole r Data; s4: performing polynomial fitting on the data to obtain a mapping relation function; s5: checking whether the mapping relation function is reasonable through the verification test block, and meanwhile, judging whether the verification test block is suitable for the method; s6: scanning the welding seam of the metal thick plate with non-uniform sound velocity by using a phased array ultrasonic technology. When the method is actually used for detecting the welding seam of the metal thick plate with the gradient acoustic velocity non-uniform, the corresponding physical depth can be checked back through the mapping relation function, and the depth error of the defect of the non-uniform material detected by the phased array ultrasonic detection technology is reduced.
Description
Technical Field
The invention belongs to the technical field of material measurement, relates to ultrasonic weld joint detection, and particularly relates to a phased array ultrasonic detection method for a weld joint of a metal thick plate with a gradient acoustic velocity non-uniform.
Background
With the continuous development of shipping industry, the cargo capacity of large container ships is also continuously rising, and from the earlier 8000TEU container ships and the development to the present 20000TEU container ships, the sudden leap of the large container ships benefits from the rapid development of hull materials. At present, rolled steel with a special treatment is adopted for steel products with important structures such as decks and outer plates of container ships with more than 18000TEU, and the steel products are detected to be steel types with non-uniform sound beam materials, and the detection of welding structures of the steel products has the problem of poor precision.
The TMCP steel is a steel material processed by reasonably controlling a plurality of processes such as billet heating temperature, rolling temperature, deformation rate and the like by adopting a thermal mechanical control technology. The TMCP steel has high strength, good toughness and higher comprehensive mechanical property, so the TMCP steel is widely applied to the construction of 18000TEU, 20000TEU and other large-scale container ships.
However, the TMCP steel has the characteristic of anisotropy due to the special process, and the anisotropy seriously affects the accuracy of defect judgment during ultrasonic detection. In the current TMCP steel nondestructive testing, an ultrasonic oblique incidence method is mainly adopted for testing, no refraction angle change or echo amplitude change along with the propagation direction (longitudinal or transverse relative to the rolling direction) exists in the anisotropic steel, but the change of the ultrasonic propagation direction of the anisotropic steel is more obvious. Such as: the refraction angle will vary with the propagation direction; the refraction angle is greater in the rolling direction (direction L) with respect to the nominal angle and smaller perpendicular to the rolling direction (direction T); the heights of the echoes measured in the L direction and the T direction by using a probe with a nominal angle of 60 degrees are approximately equal; the echo height measured in the L direction with a probe with a nominal angle of 70 deg. will be low and the position of the maximum amplitude will be less clear.
In the field test process, the ultrasonic testing technique is generally divided into three steps to calibrate the instrument: firstly, determining the propagation speed of ultrasonic waves in steel by adopting an IIW test block, as shown in figure 1; next, the incident angle of the ultrasonic steel is determined by using a TMCP steel reference block, as shown in fig. 2: finally, the DAC curves at different depths are plotted on the reference block, see fig. 3. The process of calibration differs for different inspection processes.
The defects of the conventional detection method are obvious: firstly, IIW test blocks are required to be adopted to measure the sound velocity of materials in an on-site detection process, the calibration method is generally used for isotropic and sound velocity homogeneous materials, for metal materials with uneven sound velocity, ultrasonic waves are influenced by various factors in the internal propagation process, the propagation path of the ultrasonic waves is possibly bent, the actual propagation velocities of the ultrasonic waves in different depth ranges are also inconsistent, and therefore the method for calibrating the homogeneous materials is adopted to detect the inhomogeneous materials, and the positioning of the inhomogeneous materials, particularly the positioning in the depth direction, can cause great errors.
Secondly, for steel with larger thickness, the propagation distance of the two waves is larger, the reduction of the ultrasonic propagation energy is more obvious, the sensitivity of receiving the defect echo by the conventional ultrasonic detection technology is reduced greatly, in addition, the detection object is a non-uniform material, the internal crystal grains refract the sound wave, and when a large-thickness welding seam is detected, the smaller defect echo and the clutter interfere with each other, so that the judgment of the actual position of the defect is greatly influenced. For the steel welding seam with smaller thickness, the later result can be ignored, but the TMCP steel is mostly used for large container ships, the thickness of the used plate is more than 40mm, the difficulty of repair operation is increased due to the depth error, and the reliability of detection is questioned by shipowners.
At present, no report is published at home and abroad on an acoustic beam measurement and detection calibration method capable of completely solving the problem of welding seams of thick-wall metal materials made of non-uniform materials, and professionals of all parties try to find a solution.
Disclosure of Invention
Aiming at the problems, the invention provides a phased array ultrasonic detection method for a weld joint of a metal thick plate with a gradient sound velocity non-uniform.
The purpose of the invention can be realized by the following technical scheme: the phased array ultrasonic detection method for the welding seam of the metal thick plate with the gradient sound velocity non-uniform comprises the following steps:
s1: preparing a calibration test block in the rolling direction and/or perpendicular to the rolling direction, wherein the calibration test block is a rectangular block made of metal with non-uniform sound velocity, and a plurality of transverse through holes with different depths are formed in the calibration test block;
s2: selecting a type by an inclined probe;
s3: respectively sector-scanning different physical depths D on single calibration test block by using phased array ultrasonic technology p And obtaining the angle theta and sound path S from the incidence point of the corresponding oblique probe to the transverse through hole r Data;
s4: physical depth D to all cross vias p And the angle theta and sound path S from the incidence point of the oblique probe to the transverse through hole r Performing polynomial fitting on the data to obtain a mapping relation function;
s5: checking whether the mapping relation function is reasonable through the verification test block, and meanwhile, judging whether the verification test block is suitable for the method;
s6: and scanning the weld joint of the metal thick plate with non-uniform sound velocity by using a phased array ultrasonic technology.
Further, in step S1, a plurality of lateral through holes of different depths on the calibration block are arranged in a row.
Further, in step S2, based on the principle of full coverage of the detection area, the detection angle range of the probe, the number of used wafers, and the starting wafer are determined, and then the model of the probe and the type of the wedge are determined according to the determined detection angle range of the probe, the number of used wafers, the starting wafer, and the phased array ultrasonic detection standard.
Further, step S3 includes the steps of:
s3a: connecting a phased array instrument and an inclined probe, and setting parameters of the phased array instrument;
s3b: calibrating wedge delays on an IIW test block;
s3c: placing an oblique probe on a calibration test block, detecting a transverse through hole on the calibration test block, moving the oblique probe to a proper position in the length direction, finding an echo signal of the transverse through hole, deflecting a beam at a certain angle within a detection angle range to carry out sector scanning, and recording the oblique probe when a maximum echo signal is foundAngle theta and sound path S from incidence point of probe to transverse through hole r And repeating the operation to obtain corresponding data when other transverse through holes are detected.
Furthermore, in step S3a, the parameters to be set on the phased array instrument include an initial detection sound velocity, a probe type, a scanning mode, a detection angle range, a gain, an excitation voltage, and a filtering range.
Further, in step S4, the mapping function includes at least one of the following: physical depth value D p And sound path S r Is a mapping relation function D p ＝f(S r θ); at a known physical depth D of a certain transverse through hole p Acoustic path under conditions S r And the angle theta r ＝f(D p ,θ)| Dp＝{D0,D1,D2,…} And at a specific angle theta interpolated thereby i Acoustic path under conditions S r And a physical depth D p A corresponding table of (2); at a specific angle theta i Physical depth under condition D p And sound path S r Is a mapping relation function D p ＝f(S r ,θ)|θ＝θ i 。
Furthermore, in step S5, the calibration block or other blocks with the same material characteristics and known transverse through hole depths in step S1 are selected as the verification blocks, and a physical depth in the verification blocks is scanned in a sector manner by using the phased array ultrasonic technology to be D v A certain specific angle theta is obtained i Time course value S r Wherein θ i Not identical to any angle theta obtained in step S3c, the physical depth D of the transverse through hole is obtained by the mapping relation function in step S4 p Comparison D p And D v If D is the error value of p And D v Is less than or equal to the physical depth D v 10% or 2mm, indicating that the mapping relation function is valid and reasonable, the verification test block is applicable to the method, otherwise, the steps S3c and S4 are carried out again, and the verification and comparison are carried out again, if D is carried out p And D v Is always greater than D v 10% or 2mm, indicating that the change in sound velocity for the validation coupon is non-gradual, not applicable to this method.
Compared with the prior art, the invention has the following beneficial effects: the method is characterized in that the law and the characteristics of ultrasonic emission and reflection are utilized, a phased array ultrasonic detection sector scanning technology is combined, the sound paths of the transverse through holes with different depths are measured in different angles on the material with uneven sound velocity, the sound paths, the angles and the actual depths of the transverse through holes are subjected to experimental data to establish a mapping relation function through a fitting algorithm, when the mapping relation function is used for actual phased array detection, the corresponding physical depths are back-checked through the mapping relation function, and the depth error of the defects of the non-uniform material detected by the phased array ultrasonic detection technology is reduced. The method does not pursue the actual path and sound velocity of the ultrasonic wave in the welding seam of the non-uniform metal thick plate, but leads to the result, and can reversely deduce the actual physical depth as long as the finally detected defect provides a corresponding angle and sound path. The phased array ultrasonic detection technology can reduce the problem of missed detection caused by energy attenuation by improving detection energy, and the sector scanning mode can detect small defects to the maximum extent and has high sensitivity. And the sound velocity changes of different metal materials with non-uniform sound velocity are different, so that the method is not limited by the metal materials, and is easy to popularize and apply as long as the accessibility of the sound wave can meet the requirement.
Drawings
FIG. 1 is a schematic structural diagram of an IIW test block.
FIG. 2 is a schematic structural diagram of a TMCP steel reference block.
Figure 3 is a schematic illustration of the probe placement positions and corresponding DAC curves for TMCP steel.
FIG. 4 is a schematic flow chart of the present invention.
Fig. 5 is a schematic structural diagram of a TMCP steel calibration block according to an embodiment of the present invention.
FIG. 6 is a three-dimensional mapping relationship diagram according to an embodiment of the invention
Detailed Description
The following detailed description of the embodiments of the present invention will be given in conjunction with the accompanying drawings to make it clear to those skilled in the art how to practice the present invention. While the invention has been described in connection with preferred embodiments thereof, these embodiments are merely illustrative, and not restrictive of the scope of the invention.
The phased array ultrasonic detection method for the weld joint of the metal thick plate with the gradient sound velocity non-uniform, referring to fig. 4, comprises the following steps:
s1: and preparing a calibration test block in the rolling direction and/or perpendicular to the rolling direction, wherein the calibration test block is a rectangular block made of metal with non-uniform sound velocity, a plurality of transverse through holes with different depths are formed in the calibration test block, and the plurality of transverse through holes can be arranged in a row. It should be noted that, in the actual preparation process, according to the use requirement, the more the number of prepared transverse through holes is, the more the partitions are, the more accurate the detected sound velocity is, and the higher the detection accuracy is, but the more the data amount is, the greater the operation difficulty is.
S2: the method comprises the steps of adopting an inclined probe, based on a detection area full-coverage principle, ensuring that an ultrasonic sound beam covers the whole welding seam area as far as possible, determining the detection angle range of the probe, the number of used wafers and a starting wafer, and determining the type of the probe and the type of a wedge block according to the determined detection angle range of the probe, the number of used wafers, the starting wafer and a phased array ultrasonic detection standard.
S3: respectively sector-scanning different physical depths D on single calibration test block by using phased array ultrasonic technology p And obtaining the angle theta and sound path S from the incidence point of the corresponding oblique probe to the transverse through hole r Data, comprising the steps of:
s3a: the method comprises the steps of connecting a phased array instrument and an inclined probe, and setting parameters of the phased array instrument to enable the phased array instrument to be in a working state, wherein the parameters to be set mainly comprise an initial detection sound velocity, a probe type, a scanning mode, a detection angle range, gain, an excitation voltage, a filtering range and the like.
S3b: and calibrating wedge block delay on an IIW test block (made of uniform material) by utilizing the calibration function of a phased array instrument.
S3c: placing an oblique probe on a calibration test block, detecting a transverse through hole on the calibration test block, moving the oblique probe to a proper position in the length direction, finding an echo signal of the transverse through hole, deflecting a beam at a certain angle (for example, every 5 degrees) within a detection angle range, and performing sector scanning when finding the transverse through holeRecording the angle theta and the sound path S from the incidence point of the oblique probe to the transverse through hole when the maximum echo signal is generated r Wherein, the angle theta from the incidence point of the oblique probe to the transverse through hole can be directly measured, and the sound path S r Can be obtained by direct reading from a phased array instrument; and repeating the operation to obtain corresponding data when other transverse through holes are detected.
S4: physical depth D to all cross vias p And the angle theta and sound path S from the incidence point of the oblique probe to the transverse through hole r Performing polynomial fitting on the data to obtain a mapping relation function, wherein the mapping relation function comprises at least one of the following components: physical depth value D p And sound path S r Is a mapping relation function D p ＝f(S r θ); at a known physical depth D of a certain transverse through hole p Acoustic path under conditions S r And the angle theta r ＝f(D p ,θ)| Dp＝{D0,D1,D2,…} And at a specific angle theta interpolated thereby i Acoustic path under conditions S r And a physical depth D p A corresponding table of (2); at a specific angle theta i Physical depth value D under the condition p And sound path S r Is a mapping relation function D p ＝f(S r ,θ)|θ＝θ i 。
S5: whether the mapping relation function is reasonable is checked through the verification test block, and whether the verification test block is suitable for the method is judged:
the verification test block can be selected from the calibration test block in the step S1 or other test blocks which have the same material characteristics and known depth of each transverse through hole, and a physical depth in the phased array ultrasonic technology sector scanning verification test block is D v A certain specific angle theta is obtained i Time course value S r Wherein theta is i Not identical to any angle theta obtained in step S3c, the physical depth D of the transverse through hole is obtained by the mapping relation function in step S4 p Comparison D p And D v If D is the error value of p And D v Is less than or equal to the physical depth D v 10% or 2mm, indicating that the mapping function is valid and reasonable, the proof block is adapted to the method, otherwise steps S3c and S3c are re-performedS4, checking and comparing again, if D p And D v Is always greater than D v 10% or 2mm, indicating that the change in sound velocity for the validation coupon is non-gradual, and the method is not applicable.
And S6, scanning the welding seam of the thick metal plate with the non-uniform sound velocity by using a phased array ultrasonic technology. Under the condition that the performance and the function of the phased array instrument are met, the phased array instrument can be set to be the same parameters in the step S3a, the parameters are recorded, then the detection is carried out, the angle theta from the incidence point of the oblique probe to the transverse through hole and the sound path S are obtained through the detection and recorded r Data, obtaining corresponding angle theta and sound path S through the mapping relation function in the step S4 r Lower corresponding physical depth D p I.e. the depth of the weld defect.
The calibration test block has the following advantages: 1. the method can be used for establishing a mapping relation function among the incident angle, the sound path value and the actual depth; 2. the flexibility is stronger, can be according to the demand of different detection grade and acceptance grade, independently revises the degree of depth and the aperture size of horizontal through-hole, can improve or suitably reduce corresponding detection precision, satisfies the detection requirement at different trades and different structures. The calibration test block can also be used for drawing a TCG or ACG quantitative curve of phased array ultrasonic detection and drawing a sound velocity calibration and ACG curve of conventional ultrasonic detection. In addition, for the detection of the pipe welding seam, the surface of the contact probe on the calibration test block is processed into different curvatures, so that the detection requirement of the pipe welding seam can be met.
The following describes steps S1 to S5 in the above method using an example.
S1: a rolling direction TMCP steel calibration block was prepared, as shown in FIG. 5, with a length of 500mm, a height of 50mm, and a thickness of 60mm, and transverse through holes with a diameter of 3mm were prepared at positions 100mm from one end in the length direction, at positions 1/5, 2/5, 3/5, and 4/5 in the height direction, respectively.
And S2, based on the detection full-coverage principle, selecting a 55S wedge block of a 5L64 linear array probe, defining the range of a sector scanning angle to be 35-65 degrees, exciting 16 wafers, and numbering the initial wafer to be 1.
S3, testing the transverse through holes with different depths in the TMCP test block by using an Olympus MX2 phased array instrument, and recording corresponding readings, wherein the method comprises the following specific steps:
s3a: connecting an Olympus MX2 phased array instrument with a 5L64 linear array probe, installing a probe wedge block, setting basic parameters of the phased array instrument, setting the initial sound velocity to be 3230m/s, matching the probe type, scanning a sector, exciting voltage to be 110V, filtering range to be 2.5 MHz-7.5 MHz and the like.
S3b: the wedge delay was obtained on the IIW block using calibration functions of the phased array instrument calibration to 28.45 mus and confirm that these parameters were not subject to variation throughout the test.
And S3c, placing the oblique probe on a calibration test block, detecting a transverse through hole with the burial depth of 12mm (T1/5), moving the oblique probe to a proper position in the length direction, finding an echo signal of the transverse through hole, performing sector scanning on deflection beams every 5 degrees in a detection angle range, and recording the angle theta and the sound path Sr from an incident point of the oblique probe to the transverse through hole when the maximum echo signal is found. And repeating the operation to obtain corresponding data when other transverse through holes are detected. Table 1 shows the sound path values obtained for different buried depth transverse through holes at different scanning angles.
TABLE 1 Acoustic path values obtained for different buried depth transverse through holes at different scanning angles
| Sr | 35° | 40° | 45° | 50° | 55° | 60° | 65° |
| 12mm | 4.94 | 10.96 | 11.72 | 15.00 | 20.99 | 26.65 | 32.94 |
| 24mm | 19.41 | 27.93 | 31.46 | 34.75 | 41.53 | 52.62 | 62.69 |
| 36mm | 33.90 | 43.71 | 48.59 | 53.96 | 61.90 | 76.55 | 93.38 |
| 48mm | 48.26 | 58.74 | 64.41 | 72.68 | 82.23 | 99.64 | 123.83 |
s41: the angles, the sound path and the burial depth are directly fitted through Matlab, and a corresponding function and three-dimensional mapping relation graph (see FIG. 6) is obtained as follows:
D p ＝p00+p10*θ+p01*Sr+p20*θ 2 +p11*θ*Sr+p02*Sr 2 +p30*θ 3 +
p21*θ 2 *Sr+p12*θ*Sr 2 +p03*Sr 3
wherein:
p00＝31.75
p10＝-8.082
p01＝18.63
p20＝0.3557
p11＝-4.578
p02＝0.5798
p30＝-0.9749
p21＝-0.03725
p12＝-0.27
p03＝-0.08089
s51, measuring the transverse through holes with 4 different depths under the conditions of 52 degrees and 58 degrees respectively, and obtaining a sound path value Sr as shown in the table 2:
TABLE 2 values of the course measured at 52 ℃ and 58 °
| 12mm | | 36mm | 48mm | ||
| 52° | 17.72 | 38.28 | 57.45 | 75.99 | |
| 58° | 23.59 | 46.86 | 69.40 | 91.64 |
And substituting the sound path value and the angle value into a fitting function to obtain a corrected depth value, namely table 3.
TABLE 3 horizontal through hole depth verification table (method 1)
| Depth of | T*1/5 | T*2/5 | T*3/5 | T*4/5 |
| Nominal value of | 12 | 24 | 36 | 48 |
| 52° | 12.17 | 24.07 | 35.72 | 47.36 |
| 58° | 12.67 | 24.35 | 36.13 | 47.97 |
From the results, the measured value caused by the sound velocity change of the material can be corrected in a binary polynomial fitting mode, and the error between the corresponding result and the nominal value is small, so that the actual use requirement is met.
The method 2 comprises the steps of firstly mapping the relation between the sound path Sr and the angle theta under the condition of different depths, and then obtaining the mapping relation between the physical depth value Dp and the sound path Sr under a specific angle through the difference value.
S42: polynomial fitting is performed on the sound path and the angle, and the typical polynomial structure form is as follows:
Sr＝A*θ 3 +B*θ 2 +C*θ+D
the data of 12mm, 24mm, 36mm and 48mm were fitted respectively to obtain the corresponding polynomial coefficients as shown in table 4.
TABLE 4 Sr-theta polynomial fitting coefficient Table
Further, a mapping relationship between the depth value and the sound path at a specific detection angle may be obtained:
Dp＝E*Sr 2 +F*Sr+G
TABLE 5 Dp-Sr polynomial fitting coefficients Table
| 52° | 58° | |
| E | 0.0008 | 0.0003 |
| F | 0.5407 | 0.4984 |
| G | 2.1402 | 0.0843 |
S52: the sound path values (table 2) corresponding to different burial depth transverse through holes measured under the conditions of 52 degrees and 58 degrees are respectively substituted into the fitted polynomial, and corresponding correction values can be obtained.
TABLE 6 horizontal through-hole depth verification table (method 2)
| Depth of | T*1/5 | T*2/5 | T*3/5 | T*4/5 |
| Nominal value | 12 | 24 | 36 | 48 |
| 52° | 11.99 | 24.03 | 35.97 | 48.01 |
| 58° | 11.98 | 24.06 | 35.94 | 48.02 |
It can be seen from the above results that the measured value caused by the sound velocity change of the material can also be corrected by a distribution fitting manner (firstly establishing the Sr-theta mapping relationship, and then establishing the Dp-Sr corresponding relationship), and the error between the corresponding result and the nominal value is small, so that the actual use requirement is met.
It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible without limiting the invention to the specific examples of the above embodiments. The above examples are given by way of illustration of the invention and are not intended to limit the invention. In general, the scope of the present invention should include those alternatives or modifications as would be apparent to one of ordinary skill in the art.
Claims (2)
1. The phased array ultrasonic detection method for the weld joint of the metal thick plate with the gradient sound velocity non-uniform is characterized by comprising the following steps of:
s1: preparing a steel calibration test block in a rolling direction, wherein the steel calibration test block is a rectangular block made of metal with non-uniform sound velocity, is 500mm long, 50mm high and 60mm thick, and is provided with transverse through holes with the diameter of 3mm at positions 1/5, 2/5, 3/5 and 4/5 in the height direction respectively at a position 100mm away from one end in the length direction, and a plurality of transverse through holes with different depths are arranged in a row;
s2: selecting a type by an inclined probe;
s3: the method comprises the following steps of using an Olympus MX2 phased array instrument to test transverse through holes with different depths in a TMCP test block respectively, and recording corresponding readings, wherein the method comprises the following specific steps:
s3a: connecting an Olympus MX2 phased array instrument with a 5L64 linear array probe, installing a probe wedge block, setting basic parameters of the phased array instrument, setting the initial sound velocity to be 3230m/s, matching the type of the probe, scanning a sector, exciting the voltage to be 110V, and filtering the range from 2.5MHz to 7.5MHz;
s3b: calibrating and obtaining the wedge block delay of 28.45 mu s on an IIW test block by utilizing the calibration function of a phased array instrument, and confirming that the parameters are not changed in the whole test process;
s3c, placing the inclined probe on a calibration test block, detecting a transverse through hole with the burial depth of 12mm, moving the inclined probe to a proper position in the length direction, finding an echo signal of the transverse through hole, performing sector scanning at every 5-degree deflection wave beam within a detection angle range, and recording the angle theta and the sound path Sr from the incident point of the inclined probe to the transverse through hole when the maximum echo signal is found;
s4: physical depth D to all cross vias p And angle theta and sound path from incidence point of oblique probe to transverse through holeS r Performing polynomial fitting on the data to obtain a mapping relation function;
D p =p00+p10*θ+p01*Sr+p20*θ 2 +p11*θ*Sr+p02*Sr 2 +p30*θ 3 +
p21*θ 2 *Sr+p12*θ*Sr 2 +p03*Sr 3
wherein:
p00=31.75
p10=-8.082
p01=18.63
p20=0.3557
p11=-4.578
p02=0.5798
p30=-0.9749
p21=-0.03725
p12=-0.27
p03=-0.08089
s5: selecting the calibration test block or other test blocks with same material characteristics and known transverse through hole depths in the step S1 as the verification test block, and scanning the verification test block in a sector mode by using a phased array ultrasonic technology to find that the physical depth is D v A certain specific angle theta is obtained i Time course value S r Wherein theta is i Not identical to any angle theta obtained in step S3c, the physical depth D of the transverse through hole is obtained by the mapping relation function in step S4 p Comparison D p And D v If D is the error value of p And D v Is less than or equal to the physical depth D v 10% or 2mm, indicating that the mapping relation function is valid and reasonable, the verification test block is applicable to the method, otherwise, the steps S3c and S4 are carried out again, and the verification and comparison are carried out again, if D is carried out p And D v Is always greater than D v 10% or 2mm, indicating that the sound velocity change of the proof mass is non-gradual, not applicable to this method;
s6: scanning the welding seam of the metal thick plate with non-uniform sound velocity by using a phased array ultrasonic technology.
2. The phased array ultrasonic testing method for the gradual change sound velocity non-uniform metal thick plate weld joint according to claim 1, wherein in step S2, based on the principle of full coverage of the testing area, the testing angle range of the probe, the number of wafers used and the starting wafer are determined, and then according to the determined testing angle range of the probe, the number of wafers used, the starting wafer and the phased array ultrasonic testing standard, the model number of the probe and the type of the wedge are determined.
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