CN104820018A - Method for detecting weld defects - Google Patents
Method for detecting weld defects Download PDFInfo
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- CN104820018A CN104820018A CN201510243135.5A CN201510243135A CN104820018A CN 104820018 A CN104820018 A CN 104820018A CN 201510243135 A CN201510243135 A CN 201510243135A CN 104820018 A CN104820018 A CN 104820018A
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Abstract
The invention discloses a method for detecting weld defects. The method for detecting weld defects comprises the following steps: step 1. drawing a reference image waveform; step 2. grinding a to-be-detected test piece; step 3. by using an ultrasonic transducer, performing ultrasonic scanning on the weld surface of the to-be-detected test piece and the peripheral side of the weld surface by utilizing an ultrasonic pulse echo method, collecting the waveform received by the ultrasonic transducer, and judging whether defects exist at the weld of the to-be-detected test piece and on the peripheral side of the weld surface; step 4. forming a contrast imaging waveform at the weld of the to-be-detected test piece and on the peripheral side of the weld surface; and step 5. contrasting the contrast imaging waveform and the reference image waveform, and judging whether weak connection defects exist at the weld of the to-be-detected test piece and on the peripheral side of the weld surface. With the adoption of the method, whether the weak connection defects exist can be judged without damaging the to-be-detected test piece.
Description
Technical field
The present invention relates to technical field of nondestructive testing, particularly relate to a kind of method detecting weld defect.
Background technology
Explanation of nouns:
Weak link defect: research shows, due to the existence of weldering front surface oxide film in aluminum alloy stirring friction welding process, postwelding may form one deck oxide skin(coating) inner different from weld seam at face of weld, smashed because butting surface oxide film may not stir completely in welding process, thus remain in weld seam and be semicontinuous shape distribution, be called as " S line " or " Z line ".S curve is a kind of special root defect in friction stir welding, and is defined as by S line " the Weak link defect " of one side friction stir welding.
Agitating friction welding technology is compared with traditional arc welding method (as GTAW, GMAW etc.); the welding aspect tool that agitating friction is welded on light alloy material has many advantages, as smoke dust, pore-free, without splash, without the need to add welding wire, welding time do not need use blanket gas, postwelding joint crystal grain is tiny, unrelieved stress is little and be out of shape the advantages such as little.
Weak link defect creates direct impact to friction stir welding fatigue lifetime, do not have be 21-43 times that has Weak link defect the fatigue lifetime of Weak link defect joint, the fatigue break display crackle of joint originates from the root of Weak link defect, and Weak link defect reduces the fatigue lifetime of joint to a great extent.Which also limits popularization and the use of Aluminum Alloy Friction Stir Welding technology.
The Requirements of Nondestructive Testing of S line (Weak link defect) has also become the emphasis paid close attention to thereupon, and in agitating friction welding, there is S line in nugget district, and by SEM, tem observation, S line is by the AL of 0.01 ~ 0.2 μm
2o
3particle composition, because the yardstick of this type of defect is small, general being difficult to finds, conventional ultrasound, X ray all cannot effectively detect, the detection of current S line is carried out metallographic examination to composition after mainly relying on and destroying welding line structure and just may effectively be detected, detection efficiency is very low.
The Non-Destructive Testing evaluation method of S line effectively can be detected under also there is no a kind of prerequisite not destroying structure at present.
Therefore, wish a kind of technical scheme to overcome or at least alleviate at least one above-mentioned defect of prior art.
Summary of the invention
The object of the present invention is to provide a kind of method detecting weld defect to overcome or at least alleviate at least one the above-mentioned defect in prior art.
For achieving the above object, the invention provides a kind of method detecting weld defect, the method of described detection weld defect comprises the steps: step 1: use ultrasonic transducer, the all side of ultrasound method to the known face of weld and face of weld with the testpieces of Weak link defect is utilized to carry out ultrasonic scanning, and collection returns waveform, utilization returns waveform and is depicted as benchmark imaging oscillogram; Step 2: polish to be tested, makes to be tested face of weld polish flat; Step 3: to be tested is immersed in liquid, use ultrasonic transducer, ultrasound method is utilized to carry out ultrasonic scanning to the face of weld of to be tested and all sides of face of weld, and collect the waveform that ultrasonic transducer receives, all sides whether existing defects of the commissure of to be tested and face of weld is judged with this; If not existing defects, stop detecting; If existing defects, carry out next step; Step 4: utilize the Wave data received to make the contrast imaging ripple figure of the weld seam of to be tested and all sides of face of weld; Step 6: contrast imaging oscillogram and benchmark imaging oscillogram are contrasted, judge whether the commissure of to be tested and all sides of face of weld have Weak link defect, if contrast imaging oscillogram is consistent with benchmark imaging oscillogram, then judge that to be tested has Weak link defect.
Preferably, described liquid is pure water solution.
Preferably, the ultrasound wave that described ultrasonic transducer sends vertically acts on all sides of the face of weld of to be tested and face of weld.
Preferably, the ultrasonic frequency that described ultrasonic transducer sends is 50MHz ~ 100MHz.
Preferably, all sides of described face of weld are the scope of the one times of weld width in face of weld both sides.
Preferably, the method for described detection weld defect is for detecting the welded seam area of to be tested in Aluminum Alloy Friction Stir Welding.
Preferably, described waveform is radio frequency waveform, positive half-wave waveform or negative half waveform.
In the method for detection weld defect of the present invention, contrast imaging oscillogram and benchmark imaging oscillogram are contrasted, judge whether the commissure of to be tested and all sides of face of weld have Weak link defect, if contrast imaging oscillogram is consistent with benchmark imaging oscillogram, then judge that to be tested has Weak link defect.Adopting in this way, compared to existing technology, namely can judge whether that there is Weak link defect without the need to destroying to be tested, and method is simple, convenient.
Accompanying drawing explanation
Fig. 1 is the structural representation of the method detecting weld defect according to an embodiment of the invention.
Embodiment
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
In describing the invention; it will be appreciated that; term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " etc. instruction orientation or position relationship be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limiting the scope of the invention.
Method according to detection weld defect of the present invention comprises the steps: step 1: use ultrasonic transducer, the all side of ultrasound method to the known face of weld and face of weld with the testpieces of Weak link defect is utilized to carry out ultrasonic scanning, and collection returns waveform, utilize and return waveform drawing benchmark imaging oscillogram; Step 2: polish to be tested, makes to be tested face of weld polish flat; Step 3: to be tested is immersed in liquid, use ultrasonic transducer, ultrasound method is utilized to carry out ultrasonic scanning to the face of weld of to be tested and all sides of face of weld, and collect the waveform that ultrasonic transducer receives, all sides whether existing defects of the commissure of to be tested and face of weld is judged with this; If not existing defects, stop detecting; If existing defects, carry out next step; Step 4: utilize the Wave data received to make the contrast imaging ripple figure of the weld seam of to be tested and all sides of face of weld; Step 5: contrast imaging oscillogram and benchmark imaging oscillogram are contrasted, judge whether the commissure of to be tested and all sides of face of weld have Weak link defect, if contrast imaging oscillogram is consistent with benchmark imaging oscillogram, then judge that to be tested has Weak link defect.
In the method for detection weld defect of the present invention, contrast imaging oscillogram and benchmark imaging oscillogram are contrasted, judge whether the commissure of to be tested and all sides of face of weld have Weak link defect, if contrast imaging oscillogram is consistent with benchmark imaging oscillogram, then judge that to be tested has Weak link defect.Adopting in this way, compared to existing technology, namely can judge whether that there is Weak link defect without the need to destroying to be tested, and method is simple, convenient.
See Fig. 1, a kind of method detecting weld defect of the present invention, is characterized in that, the method for described detection weld defect comprises the steps:
Step 1: use ultrasonic transducer, the all side of ultrasound method to the known face of weld and face of weld with the testpieces of Weak link defect is utilized to carry out ultrasonic scanning, and collection returns waveform, utilize and return waveform drawing benchmark imaging oscillogram.
Step 2: polish to be tested, makes to be tested face of weld polish flat.
Step 3: to be tested is immersed in liquid, use ultrasonic transducer, ultrasound method is utilized to carry out ultrasonic scanning to the face of weld of to be tested and all sides of face of weld, and collect the waveform that ultrasonic transducer receives, all sides whether existing defects of the commissure of to be tested and face of weld is judged with this; If not existing defects, stop detecting; If existing defects, carry out next step.Advantageously, this liquid is pure water solution, to increase coupling, and does not have impurity in pure water solution, convenient test.And in this step, make ultrasonic transducer send ultrasound wave and vertically act on all sides of the face of weld of to be tested and face of weld.Like this, the reception of echoed signal is conducive to.
In the present embodiment, the ultrasonic frequency that ultrasonic transducer sends is between 50MHz ~ 100MHz.Because Weak link defect is generally very tiny defect, therefore, larger ultrasonic frequency is needed.
In the present embodiment, all sides of face of weld are the scope of the one times of weld width in face of weld both sides.Such scope can ensure that ultrasonic phase array can cover whole weld seam detection scope.
Step 4: utilize the Wave data received to make the contrast imaging ripple figure of the weld seam of to be tested and all sides of face of weld.Be understandable that, this waveform is positive half-wave waveform or negative half waveform.Advantageously, this waveform is radio frequency waveform.
Step 5: utilize echo signal data to make the imaging figure of the weld seam of to be tested and all sides of face of weld.
Step 6: contrast imaging oscillogram and benchmark imaging oscillogram are contrasted, judge whether the commissure of to be tested and all sides of face of weld have Weak link defect, if contrast imaging oscillogram is consistent with benchmark imaging oscillogram, then judge that to be tested has Weak link defect.
Advantageously, the method for above-mentioned detection weld defect is for detecting the welded seam area of to be tested in Aluminum Alloy Friction Stir Welding.
Finally it is to be noted: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit.Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. detect a method for weld defect, it is characterized in that, the method for described detection weld defect comprises the steps:
Step 1: use ultrasonic transducer, the all side of ultrasound method to the known face of weld and face of weld with the testpieces of Weak link defect is utilized to carry out ultrasonic scanning, and collection returns waveform, utilization returns waveform and is depicted as benchmark imaging oscillogram;
Step 2: polish to be tested, makes to be tested face of weld polish flat;
Step 3: to be tested is immersed in liquid, use ultrasonic transducer, ultrasound method is utilized to carry out ultrasonic scanning to the face of weld of to be tested and all sides of face of weld, and collect the waveform that ultrasonic transducer receives, all sides whether existing defects of the commissure of to be tested and face of weld is judged with this; If not existing defects, stop detecting; If existing defects, carry out next step;
Step 4: utilize the Wave data received to make the contrast imaging ripple figure of the weld seam of to be tested and all sides of face of weld;
Step 6: contrast imaging oscillogram and benchmark imaging oscillogram are contrasted, judge whether the commissure of to be tested and all sides of face of weld have Weak link defect, if contrast imaging oscillogram is consistent with benchmark imaging oscillogram, then judge that to be tested has Weak link defect.
2. the method detecting weld defect as claimed in claim 1, it is characterized in that, described liquid is pure water solution.
3. the as claimed in claim 1 or 2 method detecting weld defect, is characterized in that, the ultrasound wave that described ultrasonic transducer sends vertically acts on all sides of the face of weld of to be tested and face of weld.
4. the method detecting weld defect as claimed in claim 1, it is characterized in that, the ultrasonic frequency that described ultrasonic transducer sends is 50MHz ~ 100MHz.
5. the method detecting weld defect as claimed in claim 1, it is characterized in that, all sides of described face of weld are the scope of the one times of weld width in face of weld both sides.
6. the method detecting weld defect as claimed in claim 1, it is characterized in that, the method for described detection weld defect is for detecting the welded seam area of to be tested in Aluminum Alloy Friction Stir Welding.
7. the method detecting weld defect as claimed in claim 1, is characterized in that, described waveform is radio frequency waveform, positive half-wave waveform or negative half waveform.
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| CN201510243135.5A CN104820018A (en) | 2015-05-13 | 2015-05-13 | Method for detecting weld defects |
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| CN201510243135.5A CN104820018A (en) | 2015-05-13 | 2015-05-13 | Method for detecting weld defects |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507295A (en) * | 2018-11-30 | 2019-03-22 | 中国兵器工业第五九研究所 | A kind of lossless detection method of radial direction friction welding connector Weak link defect |
| CN114433996A (en) * | 2022-03-07 | 2022-05-06 | 山东大学 | Method and system for predicting hole defects in friction stir welding |
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2015
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| CN202330369U (en) * | 2011-11-18 | 2012-07-11 | 国营红阳机械厂 | Ultrasonic inspection reference test block of friction stir welding joint |
| CN202471659U (en) * | 2011-12-31 | 2012-10-03 | 上海航天精密机械研究所 | Automatic scanning device for ultrasonic phased array inspection of aluminum plate in friction stir welding |
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Cited By (3)
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| CN109507295A (en) * | 2018-11-30 | 2019-03-22 | 中国兵器工业第五九研究所 | A kind of lossless detection method of radial direction friction welding connector Weak link defect |
| CN114433996A (en) * | 2022-03-07 | 2022-05-06 | 山东大学 | Method and system for predicting hole defects in friction stir welding |
| CN114433996B (en) * | 2022-03-07 | 2023-02-03 | 山东大学 | Method and system for predicting hole defects in friction stir welding |
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