한국해양대학교

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조선 탑재공정용 고능률 자동용접법에 관한 연구

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dc.contributor.author 최우현 -
dc.date.accessioned 2017-02-22T07:00:17Z -
dc.date.available 2017-02-22T07:00:17Z -
dc.date.issued 2007 -
dc.date.submitted 56850-02-09 -
dc.identifier.uri http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002175814 ko_KR
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/10130 -
dc.description.abstract The Korea shipbuilding industry continues to design and build the most advanced commercial vessels in the world and has the global competitiveness in the world shipbuilding market recently. Big yards maintain their competition capacity by develop and control the new block assembling and erection technologies among them. Unit block size and its weight has been larger and larger, and working day in dry dock, berth or grand block assembly area has been shorter and shorter. However, to keep their competitiveness the shipbuilders must develop and improve new technologies not only ship design part but also production processes. Especially in erection stage, by application of high deposition heavy duty welding processes such as Electroslag and Electrogas welding can reduce working time and enabling to get more cost-effective and competitiveness. As the conventional method of high efficiency welding of vertical joints, there are known various methods, such as electroslag welding, electrogas welding and consumable nozzle electroslag welding methods, and these methods have been employed in the art. In each of these known welding methods, since a groove gap is necessary, the sectional area of the groove is large, resulting in disadvantages such as excessive heat input and relatively low welding speed. Accordingly, problems are left unsolved as regards the welding efficiency and the toughness of the heat-affected zone. Disadvantages of these conventional welding methods, there has been proposed a vertical welding method in which a small diameter wire electrode is oscillated and welding is conducted in an atmosphere of carbon dioxide gas and/or other inert gases, and this method is practiced in some construction work. The objectives of this study and experimental research are to review current welding processes that are applied to pre-erection and erection stage of shipbuilding construction for instance high heat input or high deposition rate processes such as electroslag welding, electrogas arc welding and multi-pole submerged arc welding using smaller diameter electrode wire and to improve its mechanical properties, especially V-notch toughness to extend application range for actual fabrication work. Modified base materials and filler materials, weld preparations, weld qualities, qualification of welding procedures, qualification of welding personnel and, fabrication and inspection requirements for welds are included to the study with many experimental testing to gain the remarkable result of proceeds. Welding work in pre-erection or erection stage of shipbuilding construction to be carried out in flat and vertical upward position mostly and Electrogas welding is actively applied especially for vertical butt joint of thicker steel plate recently. In this study considered how to develope and improve mechanical properties of weld metal and HAZ in high heat input welding processes such as Electrogas welding and Electroslag welding with its welding equipment in order to extend the application range to the longitudinal members and hatch coaming parts of container ship. higher reliability, larger scale, and reduced weight are required for the welded steel structures, lately, in view of social requirements such as enhanced safety, environmental protection and energy conservation, and also of severer resource development conditions. Moreover there has been a strong need for the development of a heavy steel plate product that is excellent in the toughness of heat affected zones of a welded joint and that meets the requirements of high heat input welding, high strength, large thickness, and high toughness. Some components of welding system and parameters were modified to get the faster travel speed and reduce weld heat input, and also by adding additional filler rods or tubes increase the amount of deposited weld metal. With the test get some good date can apply to actual fabrication work and recommend items to manufacture welding materials make better. Above all things it's a fruition that to prepare the possibility of application of Electroslag welding to the shipbuilding construction which fill up the gap of stoppage days of more than 20 years. -
dc.description.tableofcontents 제 1 장 서론 = 1 11 연구 개발의 배경 = 1 12 탑재 용접의 환경과 특성 = 5 제 2 장 선박 탑재 공정 = 8 21 선박 탑재 공정의 개요 = 8 211 선박의 건조 공정 = 8 212 블록의 대형화 및 선행 탑재 = 11 213 대형 블록 공법의 개발 = 12 22 주요 블록 공법의 종류와 특성 = 13 221 대형 선행 탑재와 스키드 조합 공법 = 13 222 댐 공법 = 14 223 수중 탑재 공법 = 15 224 스키드 진수시스템 공법 = 17 225 육상 총조립 공법 = 18 226 플로팅 도크 건조 공법 = 19 227 기가 및 테라 공법 = 19 228 크레인 전선 진수 공법 = 21 23 블록 탑재공법의 적용 효과 = 22 231 탑재 단위 블록 중량의 증가 = 22 232 도크 작업일수의 단축 = 23 제 3 장 고능률 자동 용접법 = 24 31 일렉트로슬랙 용접 = 24 311 일렉트로슬랙 용접의 개요 = 24 312 소모 가이드 튜브식 일렉트로슬랙 용접 = 29 313 내로우 갭 일렉트로슬랙 용접 = 32 314 일렉트로 용접 응용 프로세스 = 40 32 일렉트로가스 용접 = 44 321 일렉트로가스 용접의 개요 = 44 322 다전극 일렉트로가스 용접 = 47 323 일렉트로가스 용접의 개량 = 48 324 여타 용접법과의 비교 = 50 제 4 장 일렉트로슬랙 및 일렉트로가스 용접 기반 신공정 개발 = 56 41 선체 구조용 강재 = 56 411 열가공 제어강 = 56 412 고항복강 = 63 42 용접 재료 = 65 421 일렉트로슬랙 용접용 재료 및 특성 = 65 422 일렉트로가스 용접용 재료 및 특성 = 68 43 일렉트로슬랙 고용착 용접 기법 개발 = 71 431 비소모 가이드 튜브 방식 용접 = 71 432 소모 가이드 튜브 방식의 개량 용접 = 74 433 2전극(탄뎀) 일렉트로슬랙 용접 = 81 434 실험 기법별 용접 조건 및 충격 인성 = 84 44 일렉트로가스 용접의 초후판 적용 기법 개발 = 94 441 컴바인드 용접 = 94 442 역 컴바인드 용접 = 98 제 5 장 대입열 용접부의 기계적 특성 개선 = 101 51 용접 실험 = 101 511 시험편 = 101 512 용접 방법 및 조건 = 106 513 모재 및 용접부의 화학 조성 = 110 52 실험 결과 분석 = 113 521 기계적 특성 = 113 522 단면 조직 검사 및 분석 = 133 제 6 장 결론 = 151 참고문헌 = 153 -
dc.language kor -
dc.publisher 한국해양대학교 대학원 -
dc.title 조선 탑재공정용 고능률 자동용접법에 관한 연구 -
dc.title.alternative A Study on the Development of High Deposition Automatic Welding Processes for Erection Stage -
dc.type Thesis -
dc.date.awarded 2007-02 -
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해양시스템공학과 > Thesis
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