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정영철,김찬규,이승준,정용문,박철수,이병석,박태원,김홍규,조영태 한국군사과학기술학회 2019 한국군사과학기술학회지 Vol.22 No.3
Increase of combat capability through the lightweighting of vehicles has been internationally issued. One of the methods for lightening is applying high hardness armor(HHA) steel which is outstanding ballistic performance and protection performance compared to weight. Development of HHA steel is currently completed in America, United Kingdom, Australia and Germany. It is used for not only combat vehicle, but also various combat device. Korea is developing new material of HHA steel according to this trend. When such HHA steel is applied to structure, welding process is used for connection of the structure. Cracks from hydrogen embrittlement and cold cracking are easily generated in welds of HHA steel and it greatly affects the strength of all structure. Decrease of strength from welding defect is critical to combat capability. Therefore, welding process optimization is important for performing the role of structure. In this study, international welding technology is reviewed through scientific research paper and patent.
김천조(C. J. Kim),임윤용(Y. Y. Im) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
HDCS Co.,Ltd was developed the low carbon cast steels for the large schale welding parts by the control Corbon and H₂ gas, And Rudder horn of cast steels were applicated the technology of the gas can be control 1.5ppm.
원전용 안전등급 밸브의 용접부 누설 클램핑 현장보수 기술 검토
김기홍,김기수,정환석,장무경 한국압력기기공학회 2023 한국압력기기공학회 논문집 Vol.19 No.1
The welding part of the valve needs immediate action when leakage occurs due to cracks or damage. In order to repair leakage of the welding part, the valve must be separated from the pipe or replaced with a new valve. However, it is difficult to remove the valve while operating the power plant. This study presents a method to remove leakage by precisely processing the gap between the clamp and the incision part within 0.1mm while installed in the pipe system. If the external leakage is removed using a clamp on the welding part without removing the valve during operation, the time and cost required for maintenance can be reduced.
레이저용접을 이용한 친환경 알루미늄 Fuel Filler Neck 개발
이병진(Byung-Jin Lee),정상영(Sang-Yeong Jeong),황현태(Hyun-Tae Hwang),정학순(Hak-Soon Jeong),최흥원(Hung-Won Choi) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.4
Nowadays, the automobile manufactures make a great efforts to reduce manufacturing cost, body weight and to develop eco-environmental parts in order to be more competitive and solve global warming. For these reasons, materials of automobile’s parts are changed over from general carbon steel and stainless steel to plastic and Aluminum. And, laser welding technology is introduced to apply welding between aluminum parts. In this paper, the data of laser welding parameters is collected through lots of the experiment according to the material, welding speed and laser power to apply laser welding in Aluminum fuel filler neck assembly. After manufacturing prototype of aluminum fuel filler neck, vibration durability test, tensile strength test and salt water test are applied to verify product’s satisfied function.
서승일(Seo Seung Il),김진태(Kim Jin Tae),박일철(Park Il Chul),이동헌(Lee Dong Hun),신돈수(Shin Don Su) 한국철도학회 1999 철도저널 Vol.2 No.2
Based on the development of designed technology for aluminum carbody, the prototype aluminum carbody has been constructed. All extrusion profiles required for the carbody has been produced and their quality has also been proven. For sound construction, welding technology to join aluminum extrusion profiles has been developed and jigs for precise assembly of blocks have been made. The aluminum carbody for urban subway train has been completed with the required chamber being set and the welding deformations being constrained by jigs. The safety of the carbody structure has also been proven by the static load test. And also, painting technology has been developed and the surface of the carbody has been pre-treated and painted. The developed technology to construct the aluminum carbody can be used in mass production of aluminum cars ordered by domestic and foreign customers.