CN110632179A - T-shaped joint weld quality judgment method - Google Patents
T-shaped joint weld quality judgment method Download PDFInfo
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- CN110632179A CN110632179A CN201911050998.5A CN201911050998A CN110632179A CN 110632179 A CN110632179 A CN 110632179A CN 201911050998 A CN201911050998 A CN 201911050998A CN 110632179 A CN110632179 A CN 110632179A
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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
- G01N29/04—Analysing solids
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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
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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
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/267—Welds
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Abstract
The invention discloses a method for judging the quality of a T-shaped joint weld joint, which comprises the following steps: step S100, providing a test block; s200, detecting a test block by using the ultrasonic probe to face the transverse through groove on the second surface to obtain a first echo value; s300, detecting the tested T-shaped joint by using an ultrasonic probe to just face the welding seam on a panel of the tested T-shaped joint to obtain the maximum tested echo value; and S400, comparing the measured echo value with the first echo value, and if the measured echo value is less than or equal to the first echo value, determining that the welding seam quality of the measured T-shaped joint is qualified. The test block is detected through the ultrasonic probe, the obtained value is the echo value corresponding to the allowable incomplete penetration width, then the detected echo value of the actual tested T-shaped joint is compared with the first echo value used for comparison, and the requirement of the allowable incomplete penetration width on the welding seam of the T-shaped joint can be simply and directly determined or whether the welding seam of the T-shaped joint is in accordance with the allowable incomplete penetration width requirement or not.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a method for judging the quality of a T-shaped joint weld joint.
Background
The method comprises the steps that a large number of joint positions of T-shaped structures on a ship need welding, T-shaped joints of the ship usually have a certain range of non-penetration areas, in the welding process requirement, certain allowable non-penetration widths exist for the welding of the positions of the T-shaped joints, the quality of a weld of the T-shaped joints at the positions meets the requirement as long as the width of the non-penetration areas of the T-shaped joints is smaller than or equal to the allowable non-penetration widths, and otherwise, the weld of the positions of the T-shaped joints needs to be planed and welded again.
In the prior art, the weld joint at the position of the T-shaped joint is generally measured by using an ultrasonic probe, the defect echoes of the upper end point and the lower end point of an unwelded area are respectively found out by scanning the web plate of the T-shaped joint back and forth relative to the length direction vertical to the weld joint, the height of the defect is determined by comparing the delay time difference (or the sound path difference) of the diffracted waves of the upper end point and the lower end point, the width of the unwelded area is finally determined by calculating, the whole operation process needs to be carried out in a cabin, and the workload and the calculation amount are large, so that the working intensity is high, the operation is complex, and the detection efficiency is low.
Disclosure of Invention
The embodiment of the invention aims to: the method for judging the quality of the T-shaped joint welding line can be used for conveniently and quickly judging whether the welding line of the T-shaped joint meets the process requirements or not.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for judging the quality of the T-shaped joint welding seam comprises the following steps:
step S100, providing a test block with the same material or the same acoustic performance as the tested T-shaped joint, wherein the test block is provided with a first surface and a second surface which are parallel and opposite, and a transverse through groove is vertically formed in the first surface, so that the distance H from the groove bottom of the transverse through groove to the second surface corresponds to the thickness H of a panel of the tested T-shaped joint;
s200, detecting the test block by using an ultrasonic probe to face the transverse through groove on the second surface to obtain a first echo value;
step S300, detecting the tested T-shaped joint by using the ultrasonic probe to just face a welding seam on a panel of the tested T-shaped joint to obtain a maximum tested echo value;
and S400, comparing the measured echo value with the first echo value, and if the measured echo value is less than or equal to the first echo value, determining that the welding seam quality of the measured T-shaped joint is qualified.
As a preferred technical solution of the present invention, in the step S100, a plurality of transverse through grooves are formed on the first surface, and distances H from a groove bottom of each transverse through groove to the second surface correspond to thicknesses H of the panels, respectively.
As a preferable aspect of the present invention, in the step S200, the ultrasonic probe detects each of the transverse through grooves on the second surface to obtain a plurality of first echo values, the distance H of each of the transverse through grooves is taken as an abscissa, and the corresponding first echo value is taken as an ordinate to draw a DAC curve coordinate system.
As a preferred technical solution of the present invention, in the step S300, the method further includes measuring a thickness h of a panel of the T-junction to be measured, and finding the first echo value corresponding to the thickness h of the panel on the DAC curve coordinate system.
As a preferred technical solution of the present invention, the width of the transverse through groove is consistent with the allowable non-penetration width of the weld of the T-shaped joint to be tested.
In a preferred embodiment of the present invention, the width of the sound beam of the ultrasonic probe is greater than the allowable non-penetration width of the weld of the T-shaped joint to be measured.
As a preferred embodiment of the present invention, the step S300 includes the steps of:
step S310, moving the ultrasonic probe on the panel opposite to the welding seam along the length direction of the welding seam;
step S320, when the ultrasonic probe detects the echo, stopping moving along the length direction of the welding line;
and S330, reciprocating the ultrasonic probe along the direction vertical to the welding seam to obtain a maximum echo value, and taking the maximum echo value as the measured echo value.
As a preferred embodiment of the present invention, the steps S310 to S330 are continuously performed after the step S330, and the detected position of the failure is marked.
As a preferred embodiment of the present invention, in the step S400, if the measured echo value is greater than the first echo value, the ultrasonic probe is used to detect a second echo value of the transverse groove corresponding to the distance H again, the measured echo value is compared with the second echo value again, and if the measured echo value is greater than the second echo value, the weld quality of the measured T-joint is not good.
As a preferable embodiment of the present invention, the step S200 further includes performing transmission correction on the ultrasonic probe.
The invention has the beneficial effects that: according to the T-shaped joint weld quality judging method provided by the embodiment of the invention, the transverse through groove with the width the same as the allowable non-penetration width is machined on the test block, and the distance between the groove bottom of the transverse through groove and the second surface, opposite to the machined surface of the transverse through groove, on the test block is matched with the thickness of the panel of the tested T-shaped joint, so that the allowable non-penetration width simulation of the tested T-shaped joint can be realized. And then, comparing the echo value of the detected actual tested T-shaped joint with the first echo value used as comparison, namely simply and directly judging whether the welding seam of the T-shaped joint meets the requirement of the allowable incomplete penetration width or not. By adopting the method for judging the quality of the T-shaped joint welding line, the flat panel can be directly detected outside the cabin, the problem of inconvenient operation caused by detection at narrow corners inside the cabin is avoided, the operation difficulty of detection operation is effectively reduced, and the detection efficiency is improved.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of a T-junction according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a test block according to an embodiment of the present invention.
In the figure:
1. a panel; 2. a web; 3. testing blocks; 31. a transverse through groove.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1 to 2, in the embodiment, the method for determining the quality of a T-shaped joint weld according to the present invention includes the following steps:
step S100, providing a test block 3 with the same material or the same acoustic performance of the tested T-shaped joint, wherein the test block 3 is provided with a first surface and a second surface which are parallel and opposite, a transverse through groove 31 is vertically formed in the first surface, and the distance H from the groove bottom of the transverse through groove 31 to the second surface corresponds to the thickness H of the panel 1 of the tested T-shaped joint.
For example, a rectangular test block 3 is provided, a transverse through groove 31 is vertically formed in one surface of the rectangular test block 3, and the distance H from the bottom of the transverse through groove 31 to the surface opposite to the surface on which the transverse through groove 31 is formed corresponds to the thickness H of the panel 1 of the T-junction to be tested. It should be noted that the distance H from the bottom of the transverse through groove 31 to the surface opposite to the transverse through groove 31 corresponds to the thickness H of the panel 1 of the T-shaped joint to be measured, and may mean that the distance H is equal to the thickness H, or the distance H and the thickness H are within a certain error range.
Specifically, the depth of the transverse through groove 31 to be formed can be obtained by subtracting the thickness h of the panel 1 of the tested T-shaped joint from the thickness of the rectangular test block 3, and then the corresponding transverse through groove 31 is machined on the rectangular test block 3 by adopting a machining mode.
And S200, detecting the test block 3 by using the ultrasonic probe to face the transverse through groove 31 on the second surface to obtain a first echo value.
That is, the transverse groove 31 is ultrasonically detected by the ultrasonic probe on the second surface of the test block 3, and at this time, when the sound beam emitted by the ultrasonic probe reaches the bottom of the transverse groove 31, part of the sound wave is reflected back to the ultrasonic probe by the bottom of the transverse groove 31, and at this time, the ultrasonic probe will detect the corresponding echo, i.e., the first echo value in the above step S200.
Further, in order to improve the accuracy of the first echo value, multiple measurements may be performed on the test block 3 multiple times to obtain multiple first echo values, and finally, the average value is taken as the actually used first echo value.
In addition, in a preferred embodiment, the width of the transverse through groove 31 is consistent with the allowable non-penetration width of the welding seam of the tested T-shaped joint, and the sound beam width of the ultrasonic probe is larger than the allowable non-penetration width of the welding seam of the tested T-shaped joint.
The opening width of the transverse through groove 31 is set to be consistent with the allowable non-penetration width of the welding seam of the tested T-shaped joint, and the acquired first echo value is consistent with the theoretical echo value when the allowable non-penetration width of the welding seam of the tested T-shaped joint is detected. That is, when the detected echo value detected when detecting the weld of the detected T-joint is equal to the first echo value, the non-penetration width of the weld of the detected T-joint is theoretically identical to the allowable non-penetration width.
That is, by comparing the first echo value of the transverse through groove 31 with the same width and thickness distance H, the comparison between the non-penetration width and the allowable non-penetration width of the weld of the tested T-shaped joint can be obtained, and whether the actual non-penetration width is within the allowable non-penetration width range or not can be determined, so that the weld quality of the tested T-shaped joint can be determined.
And step S300, detecting the tested T-shaped joint by using the ultrasonic probe to just face the welding seam on the panel 1 of the tested T-shaped joint to obtain the maximum tested echo value. By detecting the weld seam on the panel 1 of the tested T-shaped joint in multiple tests, the measured maximum tested echo value is the echo value corresponding to the maximum width of the unwelded area at the position, namely the width of the unwelded area at the position.
And S400, comparing the measured echo value with the first echo value, and if the measured echo value is less than or equal to the first echo value, determining that the welding seam quality of the measured T-shaped joint is qualified.
The comparison between the detected echo value and the first echo value which allows the unfused width can be obtained, the comparison between the unfused width of the welding seam of the detected T-shaped joint and the allowable unfused width can be obtained, whether the actual unfused width is in the allowable unfused width range or not can be judged, and the welding seam quality of the detected T-shaped joint can be judged.
In the embodiment of the present invention, step S300 includes the following steps:
step S310, moving the ultrasonic probe on the panel 1 opposite to the welding seam along the length direction of the welding seam;
step S320, when the ultrasonic probe detects the echo, stopping moving along the length direction of the welding line;
and step S330, reciprocating the ultrasonic probe along the direction vertical to the welding seam to obtain the maximum echo value, and taking the maximum echo value as the measured echo value.
The ultrasonic probe moves along the length direction of the welding line, so that whether the whole welding line has the incomplete penetration condition or not can be detected, then the position where the incomplete penetration exists reciprocates along the direction vertical to the welding line, the maximum echo value is obtained, the obtained maximum echo value is the maximum incomplete penetration width of the position, the effectiveness of data detected by the welding line is effectively guaranteed, and the incomplete penetration condition of the whole welding line is detected.
Further, after step S330, step S310 to step S330 are continuously executed, and the detected unqualified position is marked. The detected positions are marked, so that the length of the whole welding seam which is not completely welded and does not meet the requirement can be conveniently counted after detection is finished, and the counting of the failure rate of the whole welding seam is realized.
In a specific embodiment, in step S400, if the measured echo value is greater than the first echo value, the ultrasonic probe is used to detect the second echo value of the transverse through slot 31 corresponding to the distance H again, the measured echo value is compared with the second echo value again, and if the measured echo value is greater than the second echo value, the weld quality of the measured T-joint is not qualified.
When the detected echo value is larger than the first echo value, the second echo value is collected again by the ultrasonic probe and is used as new reference data to be compared again, firstly, the first echo value and the second echo value can be used for comparison, whether the measurement of the ultrasonic probe is inaccurate or not is judged, and then, the detection error caused by the acquisition error of the echo value at one time can be avoided.
In the embodiment of the present invention, step S200 further includes performing transmission correction on the ultrasound probe.
Specifically, the ultrasonic probe can be placed on the first surface of the rectangular test block 3, the echo is adjusted to 80% of the full scale height of the oscillographic screen, and a large flat-bottom DAC curve is drawn by detecting test blocks 3 with different thicknesses for multiple times or detecting bottom surface echoes for multiple times; and then moving the probe to the detected workpiece, finding the position between the 1-2 times of the test block 3 in the echo path of the bottom surface of the workpiece, adjusting the large flat bottom echo of the workpiece to a DAC curve, and recording the adjusted dB value (Delta dB). Finally, during actual detection, the operation is modified according to the following requirements:
a) delta dB is less than or equal to +/-2 dB, and correction is not needed;
b)2dB is less than or equal to 12dB or-12 dB is less than-2 dB, and the correction is needed;
c) the delta dB is more than 12dB or less than-12 dB, and the detection surface needs to be reground.
As shown in fig. 2, in a preferred embodiment, in step S100, a plurality of transverse through grooves 31 are formed on the first surface, and distances H from the bottom of the transverse through groove 31 to the second surface correspond to the thicknesses H of the panels 1.
Further, in step S200, the ultrasonic probe is used to detect each of the transverse through grooves 31 on the second surface to obtain a plurality of first echo values, and the distance H of each of the transverse through grooves 31 is taken as an abscissa and the corresponding first echo value is taken as an ordinate to draw the DAC curve coordinate system.
Further, step S300 includes measuring a thickness h of the panel 1 of the T-junction under test, and finding a first echo value corresponding to the thickness h of the panel 1 on the DAC curve coordinate system.
A plurality of transverse through grooves 31 corresponding to panels 1 with different thicknesses are processed on a rectangular test block 3 at one time, then ultrasonic detection is carried out on each transverse through groove 31, echo values corresponding to allowable incomplete penetration widths of welding seams of the panels 1 with different thicknesses are obtained, and the thicknesses and the echo values of the panels 1 corresponding to the transverse through grooves 31 are drawn into a DAC curve coordinate system. In the detection process, only the thickness of the panel 1 needs to be measured, and then the corresponding echo value on the DAC curve coordinate system is found to be used as the first echo value, so that the situation that the corresponding test block 3 needs to be found to acquire the first echo value for reference in each detection process is avoided. Furthermore, the panel 1 with different thicknesses can be conveniently detected, frequent calibration and detection operations are avoided, the detection efficiency is effectively improved, and the workload is reduced.
As shown in fig. 1, the T-joint comprises a panel 1 and a web 2 which are connected perpendicularly to each other, and in the prior art, a weld is mostly detected from the side of the web 2, which is measured on the side of the panel 1 by using a probe in the present embodiment.
According to the method for judging the quality of the T-shaped joint welding seam, the transverse through groove 31 with the width the same as the allowable non-penetration width is machined in the test block 3, and the distance between the groove bottom of the transverse through groove 31 and the second surface, opposite to the machining surface of the transverse through groove 31, of the test block 3 is made to be consistent with the thickness of the panel 1 of the tested T-shaped joint, so that the simulation of the allowable non-penetration width of the tested T-shaped joint can be realized. At the moment, the test block 3 is detected through the ultrasonic probe, the obtained value is the echo value corresponding to the allowable incomplete penetration width, and then the detected echo value of the actual tested T-shaped joint is compared with the first echo value used for comparison, so that the requirement of the allowable incomplete penetration width can be simply and directly met or whether the welding seam of the T-shaped joint at the position meets the requirement of the allowable incomplete penetration width or not. By adopting the method for judging the quality of the T-shaped joint welding line, the flat panel 1 can be directly detected outside the cabin, the problem of inconvenient operation caused by detection at narrow corners inside the cabin is avoided, the operation difficulty of detection operation is effectively reduced, and the detection efficiency is improved.
In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A T-shaped joint weld quality judgment method is characterized by comprising the following steps:
step S100, providing a test block with the same material or the same acoustic performance as the tested T-shaped joint, wherein the test block is provided with a first surface and a second surface which are parallel and opposite, and a transverse through groove is vertically formed in the first surface, so that the distance H from the groove bottom of the transverse through groove to the second surface corresponds to the thickness H of a panel of the tested T-shaped joint;
s200, detecting the test block by using an ultrasonic probe to face the transverse through groove on the second surface to obtain a first echo value;
step S300, detecting the tested T-shaped joint by using the ultrasonic probe to just face a welding seam on a panel of the tested T-shaped joint to obtain a maximum tested echo value;
and S400, comparing the measured echo value with the first echo value, and if the measured echo value is less than or equal to the first echo value, determining that the welding seam quality of the measured T-shaped joint is qualified.
2. The method for determining the quality of a T-shaped joint weld according to claim 1, wherein in the step S100, a plurality of transverse through grooves are formed in the first surface, and distances H from a groove bottom of each transverse through groove to the second surface correspond to thicknesses H of the panels, respectively.
3. The method for determining the quality of a T-joint weld according to claim 2, wherein in step S200, the ultrasonic probe is used to detect each of the transverse through grooves on the second surface to obtain a plurality of first echo values, the distance H of each of the transverse through grooves is taken as an abscissa, and a DAC curve coordinate system is plotted with the corresponding each of the first echo values as an ordinate.
4. The method for judging the quality of the T-shaped joint weld according to claim 3, wherein the step S300 further comprises measuring the thickness h of the panel of the tested T-shaped joint and finding the first echo value corresponding to the thickness h of the panel on the DAC curve coordinate system.
5. The method for judging the quality of a T-shaped joint weld according to claim 1, characterized in that the width of the transverse through groove is consistent with the allowable non-penetration width of the weld of the tested T-shaped joint.
6. A T-joint weld quality judging method according to claim 1, characterized in that the beam width of the ultrasonic probe is larger than the allowable non-penetration width of the weld of the T-joint under test.
7. The T-joint weld quality judging method according to claim 1, characterized by comprising, at the step S300, the steps of:
step S310, moving the ultrasonic probe on the panel opposite to the welding seam along the length direction of the welding seam;
step S320, when the ultrasonic probe detects the echo, stopping moving along the length direction of the welding line;
and S330, reciprocating the ultrasonic probe along the direction vertical to the welding seam to obtain a maximum echo value, and taking the maximum echo value as the measured echo value.
8. The method for determining the quality of a T-joint weld according to claim 7, wherein the steps S310 to S330 are continuously performed after the step S330, and the detected failure position is marked.
9. The method for determining the weld quality of a T-joint according to claim 1, wherein in the step S400, if the measured echo value is greater than the first echo value, the ultrasonic probe is used to detect a second echo value of the transverse groove corresponding to the distance H again, the measured echo value is compared with the second echo value again, and if the measured echo value is greater than the second echo value, the weld quality of the T-joint is not good.
10. The T-joint weld quality judging method according to claim 1, further comprising performing transmission correction on the ultrasonic probe in step S200.
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| CN201911050998.5A CN110632179A (en) | 2019-10-31 | 2019-10-31 | T-shaped joint weld quality judgment method |
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| CN101699279A (en) * | 2009-10-27 | 2010-04-28 | 中国长江航运集团青山船厂 | Ultrasonic defect detection method for T-shaped joint fillet weld of dual-phase steel and carbon steel |
| CN202533417U (en) * | 2012-03-06 | 2012-11-14 | 华电郑州机械设计研究院有限公司 | Reference block for detecting incomplete penetration width of T-shaped joint by straight probe |
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2019
- 2019-10-31 CN CN201911050998.5A patent/CN110632179A/en active Pending
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| CN101699279A (en) * | 2009-10-27 | 2010-04-28 | 中国长江航运集团青山船厂 | Ultrasonic defect detection method for T-shaped joint fillet weld of dual-phase steel and carbon steel |
| CN202533417U (en) * | 2012-03-06 | 2012-11-14 | 华电郑州机械设计研究院有限公司 | Reference block for detecting incomplete penetration width of T-shaped joint by straight probe |
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