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보론 강의 스폿 용접 시 발생하는 스패터 감소에 관한 연구
지성환(Sung Hwan Jee),김진아(Jin A Kim),안광우(Kwang Woo Ahn),전정도(Jung Do Jeon),전언찬(Eon Chan Jeon) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
When assemble automotive steel that produced by stamping, it is widely used the resistance spot welding which is relatively easy to work with and has an outstanding bond force. Spot welding results in different features in welding zone depending on current, weld time and change of welding force, and therefore determine weld quality. If the spatter which generated in spot welding adheres to the surface of steel, it can have a bad influence on the quality of automotive exterior and needs additional work for removal. It can cause the rising of prime costs, irregular workload and the exterior with bad images. Thus, this study will examine the optimal welding condition in order to decrease the spatter through comparison of changes in the spatter according to welding current, welding force and welding time while resistance spot welding.
A Study on the deep hole machining by BTA drill
조명제(Myoung Je Jo),이해수(Hae Soo Lee),지성환(Sung Hwan Jee),한민식(Min Sik Han),전언찬(Eon Chan Jeon) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Among drilling operation, the most difficult machining method is deep hole drilling. And deep hole drilling is difficult by using conventional drilling operation because it has problems such as chip removal, cooling and lubrication for the cutting tip and vibration problem and strength requirement of the tool. To solve these problems, the most adequate drilling method is to use tool which can supply high pressure cutting fluid. And the typical method for this application is the BTA drill. This study is related to the fuel oil supply pipe for the large ship and machining of it.