KR20130089353A - Spot welding machine able to evaluate spot welding strength - Google Patents

Spot welding machine able to evaluate spot welding strength Download PDF

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KR20130089353A
KR20130089353A KR1020120010647A KR20120010647A KR20130089353A KR 20130089353 A KR20130089353 A KR 20130089353A KR 1020120010647 A KR1020120010647 A KR 1020120010647A KR 20120010647 A KR20120010647 A KR 20120010647A KR 20130089353 A KR20130089353 A KR 20130089353A
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spot
spot welding
reliability
test
inspection
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KR1020120010647A
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Korean (ko)
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김재열
나선영
최승현
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조선대학교산학협력단
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00Resistance welding; Severing by resistance heating
    • B23K11/10Spot welding; Stitch welding
    • B23K11/11Spot welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00Resistance welding; Severing by resistance heating
    • B23K11/24Electric supply or control circuits therefor
    • B23K11/25Monitoring devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00Resistance welding; Severing by resistance heating
    • B23K11/36Auxiliary equipment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/12Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating 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
    • G01N29/04Analysing solids

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

Abstract

PURPOSE: A spot welder for implementing a reliability test on a spot welding portion is provided to implement a nondestructive test, thereby easily applying the same to a manufacturing process and inspecting defects in real time. CONSTITUTION: A spot welder for implementing a reliability test on a spot welding portion includes a test part implementing the reliability test on the spot welding portion. The test part inspects the spot welding portion through image scanning using a contactless air coupled ultrasonic probe. The test part uses a contactless air coupled ultrasonic testing (NAUT) such that a contactless ultrasonic inspection implemented through compensating energy loss from a difference between acoustic impedances in air with a high power ultrasonic pulser receiver, a PRE-AMP, and the high sensitive probe. [Reference numerals] (AA) Sash

Description

스폿용접부의 신뢰성 검사가 가능한 스폿용접기{Spot Welding Machine able to Evaluate Spot Welding Strength}Spot welding machine capable of inspecting the reliability of spot welds {Spot Welding Machine able to Evaluate Spot Welding Strength}

본 발명은 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에 관한 것으로, 보다 상세하게는 스폿용접부를 비접촉 공중 초음파를 이용하여 스폿용접부에 대한 정확한 탐상을 할 수 있는 용접 검사부가 구비되어 비파괴 검사가 가능하기 때문에 제조공정에 도입하는데 용이할 뿐만 아니라 실시간으로 결함 확인이 가능하므로 시간과 비용을 절감할 수 있는 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에 관한 것이다.The present invention relates to a spot welder capable of inspecting the reliability of the spot weld. More specifically, the spot welder is provided with a welding inspection part capable of accurate inspection of the spot weld using non-contact aerial ultrasonic waves, so that non-destructive inspection is possible. The present invention relates to a spot welder that is not only easy to be introduced into a manufacturing process but also enables defect checking in real time, so that the reliability of spot welds can be reduced in time and cost.

스폿(Spot) 용접은 피용접재를 겹쳐 국부적으로 전류를 흘려 줄 가열해 용융시키는 용접방법으로 박판을 효율좋게 접합하는데 적합해 자동차나 가전 등의 제조에 다량으로 이용되고 있다.Spot welding is a welding method in which a welding material is heated and melted by overlapping a welding material to locally flow a current, and is suitable for efficiently bonding thin plates, and is used in large quantities in automobiles and home appliances.

보통 자동차 차체 바디에 적용되는 스폿용접은 충돌, 내구, 강도, NVH 성능 등을 결정하는 중요한 요소이므로 용접부의 강도 등 제반 용접품질의 중요성은 매우 높다. 따라서, 용접품질의 확보를 위해 실차 용접파괴시험을 수행하고 있으며, 기존의 용접 고정강도의 검사방법은 인장전단시험이나 간이적으로 용접부의 벗김에 의한 필 테스트 등으로, 모두 파괴시험으로 검사시간이나 경제적 (검사비) 로스가 큰 문제점이 있다. 또한 초음파에 의한 비파괴 검사방법 등도 시도되고 있지만 평가방법이 번잡해 스폿 용접 작업 현장 등에서의 적용은 곤란하였다.Spot welding, which is usually applied to the car body, is an important factor in determining collision, durability, strength and NVH performance. Therefore, in order to secure the welding quality, the actual vehicle welding fracture test is carried out, and the existing welding fixed strength inspection method is the tensile shear test or the peel test by simply peeling the weld. Economic (test fee) loss has a big problem. In addition, non-destructive inspection methods such as ultrasonic waves have been tried, but the evaluation method is complicated, so it is difficult to apply them at the spot welding work site.

도 1은 종래 기술에 따른 스폿용접 비파괴 검사장치의 구성도이다. 종래 기술에 따른 스폿용접 비파괴 검사장치는 초음파 탐상장치로서, 측정자가 직접 스폿 용접부(110)에 초음파를 발생시키는 탐침(112)을 접촉시키면 탐침(112)에서 발생되는 초음파에 의해 모니터(114)에 초음파 패턴이 출력된다. 그러면 숙련된 전문자가 모니터(114)에 출력되는 초음파 패턴을 해석하여 용접불량 여부를 판단한다.1 is a block diagram of a spot welding non-destructive inspection device according to the prior art. The spot welding non-destructive inspection device according to the prior art is an ultrasonic flaw detection device, and when a measurer contacts the spot welding portion 110 to generate ultrasonic waves directly to the spot welding portion 110, the ultrasonic wave generated from the probe 112 is applied to the monitor 114. The ultrasonic pattern is output. Then, the skilled professional interprets the ultrasonic pattern output to the monitor 114 to determine whether the welding is poor.

그러나, 상기한 바와 같은 종래 기술에 따른 비파괴 검사장치는 초음파 탐상장치를 사용하기 때문에 숙련된 전문가만이 초음파 패턴을 해석할 수 있어 비숙련자는 사용이 불가능한 문제점이 있다.However, since the non-destructive inspection device according to the prior art as described above uses an ultrasonic flaw detection device, only a skilled expert can interpret the ultrasonic pattern, and thus a non-skilled person cannot use it.

또한, 탐침을 접촉시키는 탐촉자의 위치, 압력 및 접촉특성이 패턴 변화에 영향을 미치기 때문에 측정자의 숙련도에 따라 다른 결과를 초래하게 되어 정확한 용접불량 여부를 파악하기 어려운 문제점이 있다.In addition, since the position, pressure, and contact characteristics of the probe contacting the probe affect the pattern change, it may cause different results depending on the skill of the measurer, thus making it difficult to determine whether the welding is poor.

본 발명은 상기와 같은 점을 인식하여 안출된 것으로 본 발명의 목적은 스폿용접부를 비접촉 공중 초음파를 이용하여 스폿용접부에 대한 정확한 탐상을 할 수 있는 용접 검사부가 구비되어 비파괴 검사가 가능하기 때문에 제조공정에 도입하는데 용이할 뿐만 아니라 실시간으로 결함 확인이 가능하므로 시간과 비용을 절감할 수 있는 스폿용접부의 신뢰성 검사가 가능한 스폿용접기를 제공하는 것이다.The present invention was conceived by recognizing the above-mentioned point is an object of the present invention is a manufacturing process because the non-destructive inspection is possible because the welding inspection unit capable of accurate inspection of the spot welding portion using the non-contact aerial ultrasonic wave In addition, it is possible to provide spot welders that can be used to check the reliability of spot welds, which can save time and money because they can be easily identified and defects can be confirmed in real time.

상기와 같은 목적을 달성하기 위하여 본 발명에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기는 스폿 용접된 용접부에 대한 신뢰성 검사를 하는 검사부가 구비되어 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에 있어서, 상기 검사부는 비접촉식 공중 초음파 탐촉자로 스폿용접부를 화상 스캔하여 검사하는 것을 특징으로 한다.In order to achieve the above object, a spot welder capable of inspecting the reliability of a spot welder according to the present invention is provided with a tester for inspecting the reliability of a spot welded weld part, wherein the spot welder is capable of inspecting the reliability of the spot welder. The part is characterized in that the spot welding portion is scanned by image inspection with a non-contact aerial ultrasonic probe.

상기와 같은 구성에 의하여 본 발명에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기는 스폿용접부를 비접촉 공중 초음파를 이용하여 스폿용접부에 대한 정확한 탐상을 할 수 있는 검사부가 구비되어 비파괴 검사가 가능하기 때문에 제조공정에 도입하는데 용이할 뿐만 아니라 실시간으로 결함 확인이 가능하므로 시간과 비용을 절감할 수 있는 장점을 갖는다.The spot welder according to the present invention, which is capable of inspecting the reliability of the spot welder according to the present invention, is manufactured because the spot welder is provided with a non-destructive test capable of precise inspection of the spot welder using non-contact aerial ultrasonic waves. Not only is it easy to introduce into the process, but also defects can be confirmed in real time, which saves time and money.

도 1은 종래 기술에 따른 스폿용접 비파괴 검사장치의 구성도
도 2는 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 용접부의 화상을 취득하여 검사하는 검사부의 구성을 도시한 사진
도 3은 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 검사부의 스캔수단을 도시한 사진
도 4는 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 검사부에 의한 검사가 이루어지는 시편 A,B,C 및 D를 도시한 사진
도 5는 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 시편 A,B,C 및 D에 대한 검사부에 의해 검사된 결과를 도시한 사진
도 6은 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 PRF 주기(PRF period)에 따른 이득 화상(Gain image)을 도시한 사진
1 is a block diagram of a spot welding non-destructive testing device according to the prior art
2 is a photograph showing the configuration of an inspection unit for acquiring and inspecting an image of a welding unit in a spot welding machine capable of inspecting the reliability of the spot welding unit according to an embodiment of the present invention.
Figure 3 is a photograph showing the scanning means of the inspection unit in the spot welder capable of inspecting the reliability of the spot welding portion according to an embodiment of the present invention
4 is a photograph showing specimens A, B, C, and D, which are inspected by an inspection unit in a spot welder capable of reliability inspection of the spot welding unit according to an embodiment of the present invention.
Figure 5 is a photograph showing the results inspected by the inspection unit for the specimens A, B, C and D in the spot welder capable of reliability test spot welding according to an embodiment of the present invention
FIG. 6 is a photograph showing a gain image according to a PRF period in a spot welder capable of checking reliability of a spot welder according to an exemplary embodiment of the present invention.

이하에서는 도면에 도시된 실시예를 참조하여 본 발명에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기를 보다 상세하게 설명하기로 한다.Hereinafter, with reference to the embodiment shown in the drawings will be described in more detail spot welder capable of inspecting the reliability of the spot weld according to the present invention.

도 2는 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 용접부의 화상을 취득하여 검사하는 검사부의 구성을 도시한 사진이고, 도 3은 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 검사부의 스캔수단을 도시한 사진이고, 도 4는 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 검사부에 의한 검사가 이루어지는 시편 A,B,C 및 D를 도시한 사진이며, 도 5는 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 시편 A,B,C 및 D에 대한 검사부에 의해 검사된 결과를 도시한 사진이고, 도 6은 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 PRF 주기(PRF period)에 따른 이득 화상(Gain image)을 도시한 사진이다.2 is a photograph showing a configuration of an inspection unit for acquiring and inspecting an image of a welding unit in a spot welder capable of inspecting reliability of the spot welding unit according to an embodiment of the present invention, and FIG. 3 is a spot according to an embodiment of the present invention. In the spot welder capable of inspecting the reliability of the welded part is a photograph showing the scanning means of the inspection part, FIG. 4 is a test piece A, B which is inspected by the inspection part in the spot welder capable of inspecting the reliability of the spot welding part according to an embodiment of the present invention. , C and D is a photograph showing, Figure 5 shows the results of the inspection by the inspection unit for the specimens A, B, C and D in the spot welder capable of reliability test spot welding according to an embodiment of the present invention 6 is a photograph showing a gain image according to a PRF period in a spot welder capable of checking the reliability of a spot weld according to an embodiment of the present invention. All.

본 발명은 용접 대상에 전류를 통해 발생되는 전기 저항열로 용융상태를 만들고 외력을 가해 두 개의 전극 사이에 2,3장 이상의 금속판을 겹쳐놓고 가압하는 스폿 용접기에 스폿 용접된 용접부에 대한 신뢰성 검사를 하는 검사부가 구비된 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에 관한 것이다. 스폿 용접에 관한 부분은 통상적인 기술이므로 이하에서는 본 발명의 주요 특징인 검사부에 대한 구성을 위주로 설명하기로 한다.The present invention is to test the reliability of the welded spot welded to the spot welder to make a molten state by the electric resistance heat generated through the current to the welding target and to apply an external force to overlap the two or three metal plates between the two electrodes and pressurize It relates to a spot welder capable of inspecting the reliability of the spot welded portion provided with an inspection unit. Since spot welding is a common technique, the following description will focus on the configuration of the inspection unit, which is a main feature of the present invention.

본 발명은 검사부가 초음파 탐상법 중 하나인 비접촉 공중 초음파 검사(Non contact Air coupled Ultrasonic Testing, NAUT)를 이용하는데 NAUT는 공기 중의 음향 임피던스의 차이로 생기게 되는 에너지 손실을 High Power 초음파 Pulser Receiver, PRE-AMP, 고감도의 탐촉자로 보완하여 비접촉식으로 초음파 탐상을 가능하게 하는 탐상 방법이다. 일반적으로 초음파 탐상을 할 때 사용하는 접촉식 기법을 적용하여 탐상을 수행하지만, 본 발명은 검사부가 접촉매질(couplant) 없이도 초음파 탐상이 가능한 방법이다. NAUT는 초음파의 송신 및 수신이 안정된 상태에서 이루어지므로 기존의 접촉식 탐상으로는 불가능하였던 고온, 저온의 물질이나 시험편의 표면이 거친 부분, 좁은 지점 등에서도 탐상이 가능하다.The present invention uses a non-contact air coupled ultrasonic testing (NAUT), which is one of the ultrasonic flaw detection method, NAUT is a high power ultrasonic pulser receiver, PRE- It is a flaw detection method that enables ultrasonic flaw detection by non-contact by supplementing with AMP and high sensitivity probe. In general, the inspection is performed by applying a contact technique used when performing ultrasonic inspection, but the present invention is a method in which the ultrasonic inspection is possible without the inspection medium (couplant). Since the NAUT transmits and receives ultrasonic waves in a stable state, it is possible to detect a high temperature or low temperature material or a rough surface of a test piece or a narrow point that was impossible with conventional contact inspection.

본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기는 검사부가 고감도의 air probe, ultra high power 초음파 Pulser Receiver, PRE-AMP 및 고속 디지타이저로 구성되어 있어 고속 대용량의 디지털 데이터처리가 가능하다. 도 2 내지 도 3은 본 발명의 일실시예에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 용접부의 화상을 취득하여 검사하는 검사부의 구성을 도시한 것이며, 도면에 도시된 시스템은 100mm 사방을 0.2mm pitch, 400 sec로 스캔(scan)하여 화상화시킬 수 있도록 구성된 것이다.Spot welder according to an embodiment of the present invention, the spot welder that can be tested for reliability is composed of a high sensitivity air probe, ultra high power ultrasonic pulser receiver, PRE-AMP and high-speed digitizer enables high-speed large-capacity digital data processing Do. 2 to 3 illustrate the configuration of an inspection unit for acquiring and inspecting an image of a welding unit in a spot welder capable of inspecting the reliability of the spot welding unit according to an embodiment of the present invention. It is configured to scan and scan in mm pitch, 400 sec.

본 발명에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 용접부는 제어를 위한 구성이 LabVIEW를 설치한 컴퓨터와 probe를 장착한 자동 스캐너 장치, 확장 하드웨어로 구성된 자동 스캐너의 제어 시스템과 데이터를 모아서 기록하는 시스템으로 구성되어 있다. 검사 대상물을 고정시키는 스테이지에서는 X축/Y축 제어, 펄스신호의 수신, 해석, 데이터의 출력과 시스템의 다양한 채널화가 가능하여 이와 같은 대응이 가능하다.In the spot welder which can check the reliability of the spot weld according to the present invention, the weld is configured to collect and record the control system and data of the automatic scanner composed of a computer with LabVIEW installed, an automatic scanner device equipped with a probe, and an extension hardware. It consists of a system. In the stage of fixing the inspection object, X-axis / Y-axis control, pulse signal reception and analysis, data output and various channelization of the system are possible.

본 발명에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 용접부의 화상 탐상은 다음과 같다. 먼저 NI Controller 장치의 전원을 켜고 화상 S/W를 실행시킨 후 실행 프로그램을 통해 원점복귀, 기준위치 이동 등을 수행하여 결함 화상 탐상 이전의 조건과 일치시킨다. Pulser Receiver 설정 화면에서 신호를 조정하고 측정 범위 설정 화면에서 측정 원점, 대각점, pitch, 속도 등을 설정한다. 위와 같은 조건이 충족되었을 때 화상 스캔을 수행한다.In the spot welder capable of inspecting the reliability of the spot weld according to the present invention, image inspection of the weld is as follows. First, power on the NI Controller device, run an image S / W, and then perform an zero point return, reference position shift, and so on, to match the conditions prior to flaw detection. Adjust the signal on the Pulser Receiver setting screen and set the measurement origin, diagonal point, pitch, and speed on the measurement range setting screen. Image scanning is performed when the above conditions are met.

상기와 같이 스캔이 시작되면 송신 전압, 주파수, 파수, 화상 수정위치, 수평시간, gate 위치를 통해 화상결과를 파악한 후 최종 화상을 취득한다.
As described above, when scanning is started, the final image is acquired after identifying the image result through the transmission voltage, frequency, frequency, image correction position, horizontal time, and gate position.

<실시예 : 스폿용접 시편의 검사>Example: Inspection of Spot Welding Specimens

본 발명에 따른 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에서 용접부로 화상탐상을 하는데 사용된 스폿용접 시험편 A,B,C,D를 도 4에 나타내었다. 도 4에 도시된 spot 용접 시험편을 spot 용접부를 중심으로 두꺼운 부분, 두겹인 부분, spot용접부, 얇은 부분으로 나누어 각 부분에 대한 탐상을 수행하기 위해 조건에 맞추어 골판지에 부착하였다.4 shows spot welding test specimens A, B, C, and D used for image inspection with a weld in a spot welder capable of inspecting the reliability of the spot weld according to the present invention. Spot welding test specimen shown in Figure 4 is divided into a thick portion, a double layer, a spot welding portion, a thin portion centered on the spot weld was attached to the corrugated cardboard in accordance with the conditions to perform the inspection on each portion.

A시험편은 위에서 설정한 부분 모두를 탐상할 수 있도록 골판지에 부착한 것이며, B시험편은 spot 용접부의 주변부와 spot 용접부를 탐상하는 조건에 맞추어 골판지에 부착한 것이다. C시험편은 A시험편의 주위와 경계부분을 보강하였고 D시험편은 B시험편의 주위와 경계부분을 보강한 것이다.The test specimen A was attached to the corrugated cardboard so as to inspect all of the above-mentioned parts. The test specimen B was attached to the corrugated cardboard in accordance with the conditions for inspecting the periphery of the spot weld and the spot weld. The C test specimen reinforces the periphery and boundary of the A test specimen and the D test specimen reinforces the periphery and the boundary of the B test specimen.

스폿용접부의 화상탐상 수행에 앞서 Averaging count, Gain, Trigger mode 등과 같은 화상탐상조건을 표 1에 제시하였다.Prior to performing the image detection on the spot weld, the image detection conditions such as averaging count, gain, and trigger mode are shown in Table 1.

탐상조건Flaw detection 시편ASpecimen A 시편BPsalm B 시편CPiece C 시편DSample D Averaging countAveraging count 3535 88 88 1010 Gain(dB)Gain (dB) 45.545.5 45.545.5 49.949.9 49.949.9 Trigger modeTrigger mode Ext 1-Trig 32-Pulse kHzExt 1-Trig 32-Pulse kHz Tx freq(kHz)Tx freq (kHz) 350350 Scanning pitchScanning pitch 0.2mm0.2mm Scanning speedScanning speed 5 mm/sec5 mm / sec

도 5는 화상스캔 결과를 도시한 사진으로, 초음파의 투과율이 높을수록 적색, 투과율이 낮을수록 청색으로 화상이 나왔으며, 이에 따라 시험편의 얇고 한 겹인 부분의 투과율이 높아 적색으로, 두 겹으로 된 부분은 투과율이 낮아 청색으로 나왔다. 하지만, 스폿 용접부는 투과율이 높아 적색이나 황색으로 나와서 쉽게 스폿 용접부임을 확인할 수 있다.Figure 5 is a picture showing the results of the image scan, the higher the transmittance of the ultrasonic wave is red, the lower the transmittance of the image was blue, according to the high transmittance of the thin and single layer of the test piece in red, two layers The part showed blue with low transmittance. However, the spot welds are high in transmittance and come out in red or yellow color, so it can be easily confirmed that they are spot welds.

각 스폿 용접 시험편 A,B,C,D의 화상탐상 수행 결과 도 6에서와 같이 도 6에서 (a)는 천천히 스캔한 쪽의 부드러운 화상의 취득이 가능하였다. 여기에서 PRF(Pulse Repeatation Frequency, 송신펄스주기)가 스캔 속도를 결정하게 되는데 이 주기가 짧기 때문에 송신펄스와 투과펄스가 겹쳐 도 6의 (a)와 같이 화상이 거칠게 나오는 반면, 주기가 길기 때문에 송신펄스와 투과펄스가 겹치지 않아 도 6의 (b)와 같이 더 부드러운 화상을 취득할 수 있다.As a result of image inspection of each spot welded test specimens A, B, C, and D, as shown in FIG. 6, (a) of FIG. Here, the PRF (Pulse Repeatation Frequency) determines the scan speed. Since this period is short, the transmission pulse and the transmission pulse overlap and the image appears coarse as shown in FIG. Since the pulse and the transmission pulse do not overlap, a softer image can be obtained as shown in FIG.

Claims (1)

스폿 용접된 용접부에 대한 신뢰성 검사를 하는 검사부가 구비되어 스폿용접부의 신뢰성 검사가 가능한 스폿용접기에 있어서,
상기 검사부는 비접촉식 공중 초음파 탐촉자로 스폿용접부를 화상 스캔하여 검사하는 것을 특징으로 하는 스폿용접부의 신뢰성 검사가 가능한 스폿용접기.
In the spot welding machine, which is provided with an inspection unit for inspecting the reliability of the spot welded weld, the spot welding unit can be inspected for reliability.
The inspection unit is a spot welder capable of inspecting the reliability of the spot welding portion, characterized in that for scanning the spot welding portion with a non-contact aerial ultrasonic probe.
KR1020120010647A 2012-02-02 2012-02-02 Spot welding machine able to evaluate spot welding strength KR20130089353A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160050253A (en) 2014-10-29 2016-05-11 모니텍주식회사 ultrasonic probe
KR20180107412A (en) 2017-03-20 2018-10-02 서진산업 주식회사 Nondestructive inspection method for friction stir welding joint
KR20200037932A (en) 2018-10-02 2020-04-10 경일대학교산학협력단 Image processing method and apparatus for spot welding quality evaluation
KR20200041647A (en) 2018-10-12 2020-04-22 경일대학교산학협력단 Method and apparatus for automatically evaluating weld quality
KR20200070765A (en) * 2018-12-10 2020-06-18 현대자동차주식회사 Side direction spot welding device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160050253A (en) 2014-10-29 2016-05-11 모니텍주식회사 ultrasonic probe
KR20180107412A (en) 2017-03-20 2018-10-02 서진산업 주식회사 Nondestructive inspection method for friction stir welding joint
KR20200037932A (en) 2018-10-02 2020-04-10 경일대학교산학협력단 Image processing method and apparatus for spot welding quality evaluation
KR20200041647A (en) 2018-10-12 2020-04-22 경일대학교산학협력단 Method and apparatus for automatically evaluating weld quality
KR20200070765A (en) * 2018-12-10 2020-06-18 현대자동차주식회사 Side direction spot welding device

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