• Proceedings of the KWS Conference
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• 2005.06a
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• pp.349-351
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• 2005

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.1219-1220
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• 2012

• Proceedings of the Korean Nuclear Society Conference
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• 2001.05a
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• pp.313.2-313
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• 2001

• Proceedings of the Korean Society of Laser Processing Conference
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• 1998.11a
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• pp.14-15
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• 1998

• Proceedings of the KWS Conference
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• 2009.11a
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• pp.109-109
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• 2009

최근 유럽의 완성차 업체에서 조립라인에 적용을 시작하고 있는 레이저 원격 용접기술은 저항 점용접에서의 문제점들을 동시에 해결하고 작업 시간을 획기적으로 감소시켜 생산성을 향상시킬 수 있는 용접공정으로 떠오르고 있다. 레이저 원격 용접기술은 레이저 빔을 용접부의 원거리에서 조사하여 용접하는 기술로서 레이저의 초점거리와 갈바노미터의 고속 이송를 이용한 최첨단 용접공정이다. 높은 생산성을 유지 하기 위하여 정확한 용접 컨트롤이 필요하지만, 레이저 용접의 경우 용접시 안전 문제로 육안으로 관찰하기가 힘들다. 이러한 문제를 해결하기 위하여 모니터링이 필수적이다. 기존의 레이저 모니터링으로는 음향 센서를 이용하여 음향을 측정하는 방법이나 UV 센서, IR 센서 등의 빛을 이용한 방법이 많이 사용되어왔다. 하지만 이 방법들은 간접적인 방법들로 노이즈에 민감하고 또 설치가 까다로운 단점이 있었다. 본 연구에서는 CCD 카메라를 이용하여 시스템의 복잡함을 줄이고 더 정확하고 빠르게 용접 현상을 관찰하기 위하여 동축 모니터링 시스템을 이용하였으며, 이를 통해 Keyhole을 관찰하고 센서를 이용한 용접 변수(레이저 출력, 용접 속도 등)의 변화에 따른 용접 현상을 규명하였다.

• Journal of Welding and Joining
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• v.15 no.3
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• pp.118-127
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• 1997

With the trend towards welding automation and robotization, mathematical models for studying the influence of various variables on the weld bead geometry in gas metal arc (GMA) welding process are required. Partial penetration, single-pass bead-on-plate welds using the GMA welding process were fabricated in 12mm mild steel plates employed four different process variables. Experimental results has been designed to investigate the analytical and empirical formulae, and develop mathematical equations for understanding the relationship between process variables and weld bead geometry. The relationships can be usefully employed not only for open loop process control, but also for adaptive control provided that dynamic sensing of process output is performed.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.111-111
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• 2003

• Proceedings of the KWS Conference
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• 2006.05a
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• pp.239-241
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• 2006

• Proceedings of the KWS Conference
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• 2000.04a
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• pp.195-198
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• 2000

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.20 no.7
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• pp.105-112
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• 2021

Reduction of weld distortions and increase in productivity are some of the major goals of the shipbuilding industry. To address these issues, many researchers have attempted to apply new welding processes. In the shipbuilding industry, steel is the candidate material of choice owing to its good weldability. However, conventional welding techniques are not feasible for avoiding welding problems. Tip-rotating arc welding is one of the high-efficiency welding process that has several advantages, such as high welding speed, high melting rate, low heat input, and less distortion. The present study investigates the influence of the welding variables on the weld characteristics of tip-rotating arc welding. Welding was performed using EH36 as the base metal and SM-70s as the filler metal, which are widely used in shipbuilding. Basic experiments were conducted to understand the effects of the major welding variables, such as welding and tip-rotating speeds. The distortion and mechanical properties of the optimal welding conditions were used to evaluate the tip-rotating arc welding performance. Consequently, the feasibility of the tip-rotating arc welding process for joining steel components was investigated, so that the optimized welding conditions could be applied directly to ship body welding to enhance the quality of the welded joints.