Classifications

• • 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
  • G01N29/043—Analysing solids in the interior, e.g. by shear waves
• • 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
  • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
  • G01N29/341—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics
  • G01N29/343—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics pulse waves, e.g. particular sequence of pulses, bursts
• • 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
  • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
  • G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
• • 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
  • G01N2291/0231—Composite or layered materials
• • 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
  • G01N2291/04—Wave modes and trajectories
  • G01N2291/044—Internal reflections (echoes), e.g. on walls or defects

Definitions

• the invention relates to a method for testing compounds of metallic workpieces with plastic masses on cavities by means of ultrasound according to the preamble of claim 1.
• plastic materials are understood in the following any types of plastics, z. B. as an adhesive for bonding metallic workpieces, as a sealant or as coating materials for metallic workpieces application.
• these materials are used for the production of adhesive bonds in sheets or pipes or for coating them.
• Typical defects in such adhesive compounds are, for example, air bubbles and non-adhering connection areas (so-called kissing bonds).
• Adhesive skin (100pm - 20 ⁇ thickness), which adheres to the pipe wall, are surrounded.
• adhesive joints are usually tested by means of ultrasound in perpendicular insonification. The sound is coupled into the first joining partner (cuff) and passes through it. Part of the sound is reflected at the interface with the adhesive layer while another part penetrates the adhesive. The part that penetrates provides another reflection echo at the back of the adhesive layer. The part that is reflected at the top of the adhesive layer, however, provides a long echo train through repeated reflections in the cuff wall.
• the reflected ultrasonic signals are converted into electrical signals and selected, amplified and evaluated via time windows and diaphragms.
• the ratings refer to amplitudes of the signals and the transit times between the signals.
• the check information d. H. the amplitudes, limit value overruns, running times etc.
• Plastic layer based have several disadvantages. On the one hand, the reliable automated detection of the phase position is very difficult. On the other hand, a change in the phase position from the transition steel / plastic to steel / cavity just for metallic workpieces due to the large acoustic density is not given.
• Gap gaps occur with adhesive, are located within the plastic mass and therefore always have to the interface of the workpiece always a cavity
• the object of the invention is therefore to provide a safe and cost effective method for testing compounds of metallic workpieces with plastic masses by means of ultrasound, which avoids the disadvantages of the known methods, so that cavities in the plastic layer can be clearly detected and evaluated.
• this object is achieved in that the test frequency of
• Ultrasonic signals in a range between 1 and 10 MHz is set so that the attenuation of the sound after passing through the plastic skin at the interface
• test frequency and the pulse length are readjusted after adjustment for a minimum damping, so that in comparison to a faultless plastic material signal amplification or -Schwownung by
• Coating material detected and thus reliable statements about the quality of the coating or the bond can be made.
• test frequency is therefore initially to be chosen so that the weakening of the sound remains small after passing through the plastic skin.
• the echo from the interface of the underside of the skin / air then interferes with the echo of the interface
• Test frequencies between 1 and 10 or 3-7 MHz have proven to be favorable in tests.
• the pulse length and the test frequency should be chosen so that the
• the pulse length should be at least twice the remaining residual layer between the cavity and the workpiece. However, the pulse length should only be chosen so long that an overlay with the next following ultrasonic pulse is avoided so as not to complicate the evaluation of the signals.
• the signals should be used for the evaluation, the amplitude levels have the largest differences compared to error-free plastic compositions. Evaluations with the 6th or a subsequent echo show a greater contrast in the signal amplitudes, than, for example, evaluations with that of the second echo and are therefore excellent to evaluate.
• Differences in adhesive parameters can lead locally to test signals similar to those of defects such as air bubbles usually extend over a larger area of the workpiece, a reliable separation between the two signal causes is also advantageously possible by a two-dimensional display and evaluation using neighborhood criteria with this method.
• Figure 1 is a schematic representation of a typical adhesive joint of pipes below
• FIG. 2 ultrasonic testing of an adhesive bond according to FIG. 1,
• FIG. 3 Representation of the amplitude ratios in an ultrasonic test according to FIG. 2.
• FIG. 1 schematically shows a typical adhesive connection of pipes using a sleeve.
• the metallic pipes 1, 1 'to be joined together by gluing are in alignment with the end faces in the axial line using a
• Seal ring 3 placed in front of each other. The sealing ring 3 serves to ensure that
• a metal collar 4 is held at a radial distance from the pipe 1, 1 'via a casting aid 2, 2' arranged on both sides of the tubes 1, 1 ', so that a hollow chamber is formed for introducing the adhesive 6.
• the sleeve 4 covers the contact point of the two tubes 1, 1 ', whose overlap width is adapted to the respective requirements.
• the cuff should be made of metal, as the
• Ultrasonic testing of the adhesive bond can only be made from the metallic side of the workpiece and is advantageously carried out in the case of pipe connections from the outside of the pipe. Alternatively, an examination of the adhesive bond from the inside of the tube into consideration, if necessary, would be considered.
• the potting aid 2, 2 ' is designed so that it radially surrounds the tube 1, 1' on the one hand and on the other hand axially thereto - according to the width of the sleeve 4 - can be moved.
• FIG. 2 schematically shows the ultrasonic testing of an adhesive connection according to FIG.
• the pipe joint to be tested consists of the two sections of pipes 1, 1 'to be connected, the adhesive layer e (shown with enclosed air bubble 7) and the sleeve 4.
• test frequency of the ultrasonic signals is adjusted so that the attenuation of the sound after passing through the plastic skin at the interface
• Steel / cavity is as low as possible and the test frequency and the pulse length is adjusted so that compared to a good plastic mass signal amplification or - weakening due to interference between the top of the plastic skin at the interface steel / plastic skin and the bottom of the plastic skin at the
• Interface plastic skin / cavity reflects reflected signals.
• FIG. 3 shows the resulting representation of the amplitude ratios in FIG

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• Physics & Mathematics (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Acoustics & Sound (AREA)
• Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

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• 2009
  • 2009-12-17 DE DE102009060106A patent/DE102009060106A1/de not_active Withdrawn
• 2010
  • 2010-11-29 US US13/516,462 patent/US9535040B2/en active Active
  • 2010-11-29 BR BR112012014750A patent/BR112012014750A2/pt active Search and Examination
  • 2010-11-29 EP EP10808895A patent/EP2513644A1/de not_active Withdrawn
  • 2010-11-29 MX MX2012006840A patent/MX2012006840A/es active IP Right Grant
  • 2010-11-29 CN CN201080057344.6A patent/CN102753968B/zh not_active Expired - Fee Related
  • 2010-11-29 WO PCT/DE2010/001406 patent/WO2011072638A1/de active Application Filing
  • 2010-11-29 AP AP2012006328A patent/AP3295A/xx active
  • 2010-11-29 RU RU2012130135/28A patent/RU2515202C2/ru active
• 2012
  • 2012-06-04 CO CO12093442A patent/CO6551717A2/es active IP Right Grant

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