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- 저자 : 감병오(Byoung-Oh Kam) (검색결과 3 건)
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단락시간비를 이용한 GMAW의 비드 높이 제어에 관한 연구
감병오(BYOUNG-OH KAM),조상명(SANG-MYUNG CHO),김상봉(SANG-BONG KIM) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.2
This paper shows the experimental results controlling the height of surface and back bead in GMAW by analyzing the unexpected gaps between base metals produced in welding and by controlling welding velocity due to the variation of the gap between base metals in thin-plate welding. The back bead behavior and burn-through in I-type butt joint CO2 welding of thin mild steel are analyzed in the views of short circuit time ratio and short circuit frequency. It is shown through experimental consideration that the short circuit time ratio method is more reasonable than the short circuit frequency method in analyzing the formulation of back bead under changing the gap between base metals. Based on these results, welding manipulator is designed so as to satisfy the bead height control in real time by measuring the short circuit time ratio. To show the effectiveness of the developed bead formulation control system, the experiment is implemented under two welding conditions such as increasing gap from 0㎜ to 0.8㎜ and gradually increasing gap from 0㎜ to 1.2㎜. The experimental results show that the bead formulation can be controlled uniformly in spite of the variation of the gap between base metals.
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감병오(BYOUNG-OH KAM),김동규(DONG-KYU KIM),김광주(KWANG-ZU KIM),김상봉(SANG-BONG KIM) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.1
This paper shows the results of the development of a small size of digital type continuous and intermittent welding auto-carriage based on microprocessor (Intel 80196KC) for welding process with long welding line. The developed welding auto-carriage loads welding torch and tracks welding line. It is an automaton largely used for welding process with a lot of long welding lines such as shipbuilding and structure. Most traditional auto-carriages have been developed based on analog circuit for open loop control. So this analog circuit welding auto-carriage cannot control welding speed. Specially welding auto-carriage for intermittent welding condition is so complicated and has the low precision of control performance in welding distance and non-welding distance. The auto-carriage developed in this paper has the following characteristics: It has not only functions of traditional carriage but also functions such as pseudo-welding process of big iron structures, intermittent welding in order to limit heat for welding thin plates, crater treatment of the final step of welding, acceleration at the initial step of welding and deceleration in the final step of welding. The main control board of auto-carriage, power supply system and DC motor drive were developed and manufactured. The welding speed and the welding distance of the developed auto-carriage are controlled accurately by feedback control using photo-sensor. Hardware and software robust against the heat and noise produced on the welding process are developed.
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김상봉(Sang-Bong Kim),감병오(Byoung-Oh Kam),강병철(Byeong-Chul Kang),김동규(Dong-Kyu Kim) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.2
This paper introduces a network system for monitoring coastal oceanographic data. The network system consists of three parts such as the buoy to observe oceanographic data, the local site to collect data transferred from buoys, and the host site to construct the oecangraphic data-base and to share the information for monitoring coastal oceanographic data. The buoy has a one-board microcomputer to manage and to acquire coastal environment data in real-time. A wireless and wire communication technique is employed in order to transfer data measured by buoys and to link local and host sites, respectively. In measuring coastal environment data, this system shows more cost-effective way than the presents conventional. In addition, the real-time monitoring system continuously from various sites with the network systems.
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