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안병욱,최돈현,연윤모,정승부,Ahn, Byung-Wook,Choi, Don-Hyun,Yeon, Yun-Mo,Jung, Seung-Boo 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.2
Ferritic stainless steels are widely used in the construction industry and in exhaust manifolds due to their low cost and relatively superior stress corrosion cracking resistance and pitting corrosion resistance compared to austenite stainless steels. Ferritic stainless steels are currently welded by various welding process including gas tungsten arc welding (GTAW), electron resistance welding (ERW) and laser beam welding. However, when these stainless steels are welded by fusion welding, some problems occur in the fusion zone (FZ) and heat affected zone (HAZ). First, the ductility of the weld is reduced due to the grain growth in the FZ and HAZ. Second, as its HAZ is frequently sensitized during welding, corrosion resistance deteriorates in this region due to the Cr depletion zone. To prevent these problems, it is recommended that ferritic stainless steels be welded with a low heat input. In this study, recent researches in the view of friction stir welded ferritic stainless steels are briefly reviewed.
마찰교반접합된 알루미늄 합금의 내식 특성에 관한 연구 동향
안병욱,최돈현,연윤모,정승부,Ahn, Byung-Wook,Choi, Don-Hyun,Yeon, Yun-Mo,Jung, Seung-Boo 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.2
Aluminum alloys have been considered for substantial use in these industries. This ensues from their attractive strength to weight ratio, superb formability, apposite weldability and acceptable corrosion resistance. Depending on the specific application, corrosion behavior is a significant factor of a welded joint. In this study, recent researches in the view of corrosion resistance of friction stir welded aluminum alloys are briefly reviewed.
안병욱(Ahn Byung Ook) 역사비평사 2010 역사비평 Vol.- No.93
In Korea, the past affairs problem are connected with other problems such as the pro-Japanese criminal acts problem against the Korean people, massacred civilians problem during the Korean war, and the human rights abuse problem under the military regimes. During the past decades our society has steadily raised the public awareness and attention toward the truth and to help the victims. Still, it was difficult to provide the rightful conditions for the committees to carry out their missions as endowed and expected. In 2003, as soon as the Roh Moo-hyun administration launched, it took the past settlement issue as one of its social reformation tasks on a governmental dimension and drove accordingly. The late president, Mr. Roh, also recommended the National Intelligence Service, the National Police Agency, and the Ministry of National Defense, those organizations that are mostly responsible for the past violence and human rights abuse, that they themselves investigate into the past suspicious affairs in order to bring the mistakes into the light, reveal their misdeeds, self-examine, and to repent their wrong-doings before they commence a fresh, new start. Thus, the belated work to settle the past created a front line of conflict in which the extreme conservatives confronted the reformists and the conservative powers confronted the progressive powers. There was also distinctive difference in the ways the different governments deal with the issue of the past settlement, according their individual character. The work to settle the past was far from an easy thing due to the resistance from the privileged class that has been enjoying the vested rights. Under the Roh Moo-hyun administration, when the past settlement operation began full-fledged, the support of the public opinion was about 60%. Nevertheless, the Lee Myung-bak administration which stood clearly against past settlement made it a political issue, greatly defaming its significance. As yet, Korean society has not secured socio-politically stable circumstances in which shameful wrong-doings of the past can be disclosed as they were. Most of the committees are facing difficulties to carry out their mission because of the obstructions from the privileged class and those who are enjoying the benefits.