• Journal of Welding and Joining
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• 제12권3호
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• pp.101-108
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• 1994

The horizontal continuous casting process with the heating mold was adopted for fabricating defect-free 4043 Al alloy rods of 3.2m dia. with mirror surfaces. These rods were drawn into 2.4mm dia. rods for GTAW welding. The GTAW welding tests were carried out by use of these welding rods with 6061 Al alloy as a base metal. After welding, the X-ray tests, tensile strength tests, bending tests, and microstructural analysis of welded zone and HAZ were carried out. The results represented that the welding rods with good surfaces and welding properties could be made by the horizontal continuous casting, and followed by the drawing process.

• 한국레이저가공학회:학술대회논문집
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• 한국레이저가공학회 2006년도 추계학술발표대회 논문집
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• pp.3-7
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• 2006

• Journal of Welding and Joining
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• 제10권4호
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• pp.240-249
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• 1992

The objective of this study is to investigate the characteristics of welded joints on the Zircaloy-4 resistance upset welding for HWR(Heavy Water reactor)fuel rods. To estimate the characteristics of welded joints, the various tests were performed on the test coupons systematically with a wide range of each welding parameters in terms of a tensile test, burst test, knoop hardness test and metallography. Major results obtained in this study are as follows: 1. The tube and machined with 120.deg. projection was the reliable weld joint design for the nuclear fuel rod end cap welding. 2. As the weld current and the amount of upset increased linearly with increasing welding main heat input, it could make an estimate of their variation in accordance with the phase shift control. 3. It was found that an increase in squeeze force has an effect on the upset contour of welded joint because the amount of upset were increased by the change of squeeze force.

• 한국정밀공학회지
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• 제23권10호
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• pp.7-13
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• 2006

• Journal of Welding and Joining
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• 제19권5호
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• pp.460-465
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• 2001

본고에서 피로균열성장에 대한 일반사항과 배관용접부 결함의 피로수명평가 방안에 대해서 알아보았다. 고압의 가연성 가스나 액체를 수송하는 배관이 피로에 의해 파괴되는 경우에는 엄청난 재산과 인적 손실을 발생시킬 수 있다. 따라서 배관운용회사들은 배관의 안정적인 운용을 위하여 다양한 환경에 노출되어있는 배관의 피로특성을 정확히 평가해야 한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 춘계학술대회 논문집
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• pp.389-390
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• 2007

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 춘계학술대회 논문집
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• pp.65-66
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• 2007

• 한국전자통신학회논문지
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• 제6권4호
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• pp.517-522
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• 2011

수작업에 의한 기존의 프로젝션(projection) 용접시스템은 작업자의 부주의로 인한 불량이 자주 발생한다. 본 논문에서는 비전카메라를 사용하여 부품과 제품의 인식, 용접 및 수량 관리를 자동으로 수행하는 프로젝션 용접시스템을 제안한다. 제안 시스템은 비전카메라를 사용하여 용접에 사용되는 부품의 유무와 놓인 상태를 검사한다. 그리고 부품의 용접 후에는 제품 수량 카운터와 드레싱 등의 항목을 자동 갱신한다. 기존 시스템과의 비교 실험을 통해 불량률을 감소시키고 생산성을 높일 수 있음을 보인다.

• Journal of Welding and Joining
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• 제32권1호
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• pp.87-92
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• 2014

Recently, use of thick Al 5083 plate has increased in production of LNG storage tank. In general, multi-pass welding has been used to achieve sufficient penetration in thick plate welding. High current welding which enables high deposition and deep penetration is preferred in thick plate welding because the increase of number of pass increases manufacturing cost and formation of weld defect. In this study, welding characteristics according to various Ar/He shielding gas composition was investigated in high current MIG welding. The bead-on-plate welding and V groove welding were conducted on Al 5083 alloy with a thickness of .25 mm. The effect of shielding gas composition on bead shape was evaluated and proper shielding gas composition was proposed. Also arc stability was examined under selected shielding gas composition. One side-one pass welding experiments were conducted for V groove specimen with a thickness of 25 mm. Mechanical properties and hardness profiles were measured for the V groove specimens.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1998년도 추계학술대회 학술발표 논문집
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• pp.539-544
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• 1998

Generally, welding gap is a serious factor of a falling-off in weld quality among various kind of weld defect. Welding gap is created between two work piece in GMAW(Gas Metal Arc Welding) of horizontal fillet weld because surface of workpiece is not flat by cutting process. In these days, there were many attempts to detect welding gap. though we prevalently use the vision sensor or arc sensor in welding process, it is difficult to detect welding gap for improvement of welding quality. But we have a trouble to find relationship between welding gap and many welding parameters due to non-linearity of welding process. As mentioned about the various difficult problem, we can detect welding gap precisely using neural networks which are able to model non-linear function. Also, this paper was proposed real-time monitoring of weld bead shape to find effect of welding gap and to estimate weld quality. Monitoring of weld bead shape examined the correlation of welding parameters with bead eometry using learning ability of neural networks. Finally, the developed system, welding gap detecting system and bead shape monitoring system, is expected to the successful capability of automation of welding process by result of simulation.