CN105301098A - Method for detecting ultra-thin aluminum alloy butt-jointed welding seams through ultrasonic waves - Google Patents
Method for detecting ultra-thin aluminum alloy butt-jointed welding seams through ultrasonic waves Download PDFInfo
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- CN105301098A CN105301098A CN201510383237.7A CN201510383237A CN105301098A CN 105301098 A CN105301098 A CN 105301098A CN 201510383237 A CN201510383237 A CN 201510383237A CN 105301098 A CN105301098 A CN 105301098A
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Abstract
The invention discloses a method for detecting ultra-thin aluminum alloy butt-jointed welding seams through ultrasonic waves. The method comprises the following steps: selecting a probe special for detecting an aluminum plate, selecting a special reference test block, selecting a special standard test block, selecting a special test block material, selecting special reference test block hole diameter and selecting a special DAC amplitude curve, wherein the reference test block and the test block material are the same test block. With the adoption of the method for detecting the ultra-thin aluminum alloy butt-jointed welding seams through the ultrasonic waves, disclosed by the invention, the defect detection rate can be increased greatly during detection of workpieces to be detected and the missing detection rate is reduced; compared with the conventional ultrasonic defect detection rate of 80.19%, the ultrasonic defect detection rate of the method disclosed by the invention is 92.6%.
Description
Technical field
The present invention relates to the method for a kind of ultrasound examination ultra-thin aluminum alloy butt-weld, belong to ultra-thin aluminum alloy butt-weld detection technique field.
Background technology
Ultrasound examination steel weld seam country has special standard GB/T11345-2013 shipbuilding industry also to have respective standard CB/T3559-2011, but the inspection of Welded aluminium alloys does not have special standard, like this for DAC curve, frequency probe selects and the evaluation of defect causes certain upper technical difficulty, and detection can not normally be carried out.
Because the density ratio steel of aluminium is little, and there is oxide film in surperficial major part, and the Poisson ratio causing material is also different, and when thin board welding seam detects, when adopting shear wave oblique incidence, Sound transmission loss is large, causes evaluation result inaccurate, easily causes undetected.
UT (Ultrasonic Testing) has can carry out the advantages such as quantitative and qualitative location to defect, but industry adopts A-mode ultrasonic wave inspection instrument to belong to waveform display, and equipment is little portable, is widely used in weld inspection; It is simple and clear that x-ray inspection has evaluation, can reflect defect size comprehensively, but can not draw depth of defect, reprocess cause difficulty to engineering, and equipment is comparatively large, not easily moves, so most of weld inspection adopts UT (Ultrasonic Testing).
Summary of the invention
(1) technical matters that will solve
For solving the problem, the present invention proposes the method for a kind of ultrasound examination ultra-thin aluminum alloy butt-weld, it can not only realize ultrasound examination has standard technology to comply with to ultra-thin aluminum alloy plate butt-weld detection, and can improve the recall rate of defect greatly.
(2) technical scheme
Ultrasound examination ultra-thin aluminum alloy butt-weld method of the present invention, described method is as follows: get and survey aluminium sheet dedicated probe, choose special reference block, choose application specific standard test block, choose special test block material, choose special reference block aperture, choose special DAC amplitude curve; Described reference block and test block material are same test block;
Choose the dedicated probe of detection aluminium sheet: adopt 5MHz, piezoelectric is lead zirconate titanate, and wherein piezoelectric constantd33 is 374m/v, piezoelectric voltage constant g33 is 2.48Vm/N, electromechanical coupling factor 0.49, and frequency constant is 1.89MHz.mm, wafer size 6mm*6mm, head angle is 71.56; Result: wafer size is little, ultrasound wave wavelength is shorter, easily finds the defect of 0.5 times of wavelength, and acoustic energy is concentrated;
Choose special reference block: the test block of thin plate specialty, be applicable to 25mm with the flaw detection of lower plate, at degree of depth 5mm, 12mm, curve is done in hole, the defect smaller for depth of burial easily finds, and easy to carry; Thickness of slab is thinner, and volume is little, and thin plate is special, directly accomplishes 12mm when doing second point, and do not have 10mm depth transition, and make test block with aluminum alloy material, surfaceness is little, parameter registration;
Choosing special reference block: it is IIW modified, regulating the Scanning speed of shear wave and investigative range increase diameter 50mm44mm60mm stepped hole to add the resolving power of shear wave by increasing the round ladder circular arc that increases of R50; Make Special test block, ensure that shear wave investigative range, and resolving power;
Choose special test block material: by material list, the material composition of inquiry aluminium alloy, then makes test block, and then makes test block follow the material of workpiece to be consistent, ensure that the positioning requirements of defect; Result: defect location is accurate, and error is less than 1mm;
Choose special reference block aperture, choose Φ 2 aperture reference block and carry out DAC curve plotting, easily find 2mm side-to-side dimensions defect; Strong for little Defect resolution;
Choose special amplitude curve; Adopt DAC curve evaluation line-18, quantitative line-12, sentences the detection that scrap wire-6 carries out defect; Detection level is greater than C level, easy discovery tiny flaw, for diameter be less than the pore of 3mm, slag inclusion sensitivity very high, the sensitivity especially weld seam broadband being less than to the thin plate inspection of 6mm is greater than 60dB usually, chooses the mode improving amplitude curve and strengthens tiny flaw Checking on effect good; Detection sensitivity is high, easily finds little defect, respond well.
(3) beneficial effect
Ultrasound examination ultra-thin aluminum alloy butt-weld method of the present invention, can greatly improving defect detection rate when detecting examined workpiece, reducing loss; Passing through the existing ultrasonic defect recall rate of contrast is 80.19%; Ultrasonic defect recall rate 92.6% of the present invention.
Embodiment
A method for ultrasound examination ultra-thin aluminum alloy butt-weld, described method is as follows: choose and survey aluminium sheet dedicated probe, choose special reference block, choose application specific standard test block, choose special test block material, choose special reference block aperture, choose special DAC amplitude curve; Described reference block and test block material are same test block;
Choose the dedicated probe of detection aluminium sheet: adopt 5MHz, piezoelectric is lead zirconate titanate, and wherein piezoelectric constantd33 is 374m/v, piezoelectric voltage constant g33 is 2.48Vm/N, electromechanical coupling factor 0.49, and frequency constant is 1.89MHz.mm, wafer size 6mm*6mm, head angle is 71.56; Result: wafer size is little, ultrasound wave wavelength is shorter, easily finds the defect of 0.5 times of wavelength, and acoustic energy is concentrated;
Choose special reference block: the test block of thin plate specialty, be applicable to 25mm with the flaw detection of lower plate, at degree of depth 5mm, 12mm, curve is done in hole, the defect smaller for depth of burial easily finds, and easy to carry; Thickness of slab is thinner, and volume is little, and thin plate is special, directly accomplishes 12mm when doing second point, and do not have 10mm depth transition, and make test block with aluminum alloy material, surfaceness is little, parameter registration;
Choosing special reference block: it is IIW modified, regulating the Scanning speed of shear wave and investigative range increase diameter 50mm44mm60mm stepped hole to add the resolving power of shear wave by increasing the round ladder circular arc that increases of R50; Make Special test block, ensure that shear wave investigative range, and resolving power;
Choose special test block material: by material list, the material composition of inquiry aluminium alloy, then makes test block, and then makes test block follow the material of workpiece to be consistent, ensure that the positioning requirements of defect; Result: defect location is accurate, and error is less than 1mm;
Choose special reference block aperture, choose Φ 2 aperture reference block and carry out DAC curve plotting, easily find 2mm side-to-side dimensions defect; Strong for little Defect resolution;
Choose special amplitude curve; Adopt DAC curve evaluation line-18, quantitative line-12, sentences the detection that scrap wire-6 carries out defect; Detection level is greater than C level, easy discovery tiny flaw, for diameter be less than the pore of 3mm, slag inclusion sensitivity very high, the sensitivity especially weld seam broadband being less than to the thin plate inspection of 6mm is greater than 60dB usually, chooses the mode improving amplitude curve and strengthens tiny flaw Checking on effect good; Detection sensitivity is high, easily finds little defect, respond well.
Embodiment recited above is only be described the preferred embodiment of the present invention, not limits the spirit and scope of the present invention.Under the prerequisite not departing from design concept of the present invention; the various modification that this area ordinary person makes technical scheme of the present invention and improvement; all should drop into protection scope of the present invention, the technology contents of request protection of the present invention, all records in detail in the claims.
Claims (1)
1. a method for ultrasound examination ultra-thin aluminum alloy butt-weld, is characterized in that: described method is as follows: choose and survey aluminium sheet dedicated probe, choose special reference block, choose application specific standard test block, choose special test block material, choose special reference block aperture, choose special DAC amplitude curve; Described reference block and test block material are same test block;
Described detection aluminium sheet dedicated probe is for adopting 5MHz, and piezoelectric is lead zirconate titanate, and wherein piezoelectric constantd33 is 374m/v, piezoelectric voltage constant g33 is 2.48Vm/N, electromechanical coupling factor 0.49, and frequency constant is 1.89MHz.mm, wafer size 6mm*6mm, head angle is 71.56;
Described special reference block is aluminum alloy material, thin plate specialty test block;
Described special reference block for being the test block of IIW modified, by increase R50 circle ladder circular arc;
Described special test block material is the aluminum alloy materials that test block material selection is identical with workpiece material;
Described special reference block aperture is the aperture pair of Φ 2;
Described special amplitude curve is for adopting DAC curve evaluation line-18, and quantitative line-12, sentences the detection that scrap wire-6 carries out defect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510383237.7A CN105301098A (en) | 2015-06-27 | 2015-06-27 | Method for detecting ultra-thin aluminum alloy butt-jointed welding seams through ultrasonic waves |
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| CN201510383237.7A CN105301098A (en) | 2015-06-27 | 2015-06-27 | Method for detecting ultra-thin aluminum alloy butt-jointed welding seams through ultrasonic waves |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781854A (en) * | 2019-02-25 | 2019-05-21 | 河北普阳钢铁有限公司 | The detection method of inclusion defect in a kind of flat metal plate |
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| CN109781854A (en) * | 2019-02-25 | 2019-05-21 | 河北普阳钢铁有限公司 | The detection method of inclusion defect in a kind of flat metal plate |
| CN109781854B (en) * | 2019-02-25 | 2022-03-29 | 河北普阳钢铁有限公司 | Method for detecting inclusion defect in flat metal plate |
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