• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2005.05a
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• pp.258-263
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• 2005

Because of its high performance and accuracy, electron beam welding has an important role in industrial applications such as semi-conductor and LCD manufactures. Since its operation has been done in a vacuum room, it is very difficult to check out their weldability as well as the correct welding area of the specimen. In this study, a measurement system of the electron beam welding has been developed based on the 3-axis LVDT controlled table. In addition, the algorithm to tracking the welding line has been developed. Welded regions were measured by using an A-scan ultrasonic sensor only. Weldability of the aluminum specimen has been tested by newly developed measuring system. The results are compared with those by using an C-scan ultrasonic sensor, which show good agreements with each other.

• Journal of Welding and Joining
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• v.16 no.1
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• pp.63-69
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• 1998

The stress intensity factor has been calculated theoretically for the cracked plate subjected to remote normal stress and reinforced with a sheet by symmetric seam welding. The singular integral equation was derived based on displacement compatibility condition between the cracked sheet and the reinforcement plate, and solved by means of Erdogran and Gupta's method. The results from the derived equation for stress intensity factor were compared with FEM solutions and seems to be reasonable. The reinforcement effect gets better as welding line is closer to the crack and the stiffness ratio of the cracked plate and the reinforcement sheet becomes larger.

• Journal of the Korean Society for Precision Engineering
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• v.10 no.2
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• pp.170-177
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• 1993

In robotic arc welding, the roll (rotation) of the torch about its direction vector does not have any effect on the welding operation. Thus we could use this redundant degree of greedom for the motion control of the robot manipulator. This paper presents an algorithm for the pseudo- inverse kinematic motion control of the 6-axis robot, which utilizes the above mentioned redunancy. The prototype welding operation and the tool path are also graphically simulated. Since the proposed algorithm requires only the position and normal vector of the weldine as an input data, it is useful for the CAD-based off-line programming of the arc welding robot. In addition, it also has the advantages of the redundant manipulator motion control, like singularity avoidance and collision free motion planning, when compared with the other motion control method based on the direct inverse kinematics.

• Proceedings of the KWS Conference
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• 2004.05a
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• pp.24-26
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• 2004

현재 박판조립라인에서 널리 사용되는 저항용접은 용접기술과 자동화 기술의 발달로 자동차, 가전제품 등의 분야에서 중요한 위치를 차지하고있다. 그러나 용접 품질의 좋고 나쁨은 육안으로 식별하기 어렵기 때문에 점용접의 품질 확보에 어려움을 겪고 있다. (중략)

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.1008-1011
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• 1998

Output of arc welding power source can be evaluated dynamically and also statically through an arc simulator. The arc simulator is developed to simulate the arc load of short circuit and arc and return power to the line.

• Proceedings of the KWS Conference
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• 2005.11a
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• pp.52-54
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• 2005

• Journal of Welding and Joining
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• v.28 no.4
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• pp.1-4
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• 2010

• Proceedings of the KWS Conference
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• 2005.06a
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• pp.314-316
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• 2005

이 논문에서는 아크 용접시 발생하는 IR신호와 UV호의 상호 관계를 알아보려고 레이저 용접진단에 사용되는 IR-UV 센서 모니터링 시스템을 적용하였다. 그 결과 IR신호 크기는 용접폭에 관련이 있고, 펄스 형태의 UV신호는 IR신호 증가율이 임계값을 넘으면 나타나는 것을 알 수 있다.

• Proceedings of the KWS Conference
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• 2005.06a
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• pp.244-246
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• 2005

• Journal of Welding and Joining
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• v.13 no.1
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• pp.78-88
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• 1995

This paper was performed to study the utility of the SP(small punch) test and the AE(acoustic emission) test in the evaluation of SCC(stress corrosion cracking) susceptibility for parent metal and bond line of HT80 steel-weld joint by SAW(submerged arc welding) with the various pH values. The loading rate used was 3*10$^{-4}$ mm/min and the corrosive environment used was synthetic sea water during the SP test and the AE test. According to the test results, the SCC susceptibility of the parent metal was increased in the order of pH6.0, pH8.2 and pH10.0. On the other hand, the bond line showed almost the same high SCC susceptibility in all pH concentrations. Synthetically, from the results of the SCC susceptibility, the macro- and micro-SEM observation, the microfracture behaviors by AE test and the relationship between SCC susceptibility and displacement at incipient failure, .delta.$_{i.f-AE}$, it can be concluded that the SP test and the AE test are the good test methods to evaluate the SCC susceptibility for parent metal and bond line of the weld joint with the change of environmental factors.