지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 조상명
- 발행연도
- 2014
- 저작권
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As the importance of offshore and chemical plant industry has emerged, the demand for special metal products to improve corrosion and heat resistance increased, and the cladding technology has risen as a major concern. In current small-diameter pipe cladding, TIG welding of low productivity is mainly used, and a study on a material in the form of a flat type strip which increase a productivity by 3 folds in existing low productivity wire shape has been proceeded, and it was thereafter developed as C-type of concaved shape by applying the plasma stream theory to a flat type strip.
In this study, a productivity is examined by comparing the deposition rates of a flat type strip and C-type strip, and a method of obtaining broad beads to solvea high bead height problem caused by the increase of deposition cross-sectional area due to the low welding speed in a high deposition rate, which is a problem of C-type strip, was studied through a change of process condition. As a result, when a weaving width was increased, a bead width was increased, and an increase of bead width when dwell time was applied was confirmed. In addition, a tendency of bead width increase was appeared when the welding current is increased, and a phenomenon of bead width increase was also observed when an experiment was done with increased amount of He in shielding gas. Through these broad bead experiments above, a method of solving a high bead height problem of CS-TIG was confirmed, and it is considered to be one step forward advance in a practical use of CS-TIG.
In this study, a productivity is examined by comparing the deposition rates of a flat type strip and C-type strip, and a method of obtaining broad beads to solvea high bead height problem caused by the increase of deposition cross-sectional area due to the low welding speed in a high deposition rate, which is a problem of C-type strip, was studied through a change of process condition. As a result, when a weaving width was increased, a bead width was increased, and an increase of bead width when dwell time was applied was confirmed. In addition, a tendency of bead width increase was appeared when the welding current is increased, and a phenomenon of bead width increase was also observed when an experiment was done with increased amount of He in shielding gas. Through these broad bead experiments above, a method of solving a high bead height problem of CS-TIG was confirmed, and it is considered to be one step forward advance in a practical use of CS-TIG.
목차
Abstract ······························································································ ⅲ제 1 장 서 론 ························································································ 1 1.1 연구 배경 및 필요성 ······································································· 11.2 연구 목적 및 개요 ·········································································· 4제 2 장 이론적 배경 ··············································································· 52.1 TIG(tungsten inert gas) 용접 ························································· 52.1.1 GTAW의 정의 ··········································································· 62.1.2 GTAW의 원리 ··········································································· 62.1.3 GTAW의 장단점 ········································································ 72.2 GTAW 용접기 및 재료 ··································································· 82.2.1 용접기 ······················································································ 82.2.2 용접토치 ················································································· 102.2.3 용접재료 ················································································· 112.3 육성용접(Overlay Welding) ·························································· 132.4 TIG 용접의 용가재 형상과 용접 특성에 미치는 영향 ······················· 152.5 플라즈마 스트림 이론(Theory of Plasma stream) ·························· 16제 3 장 Flat-형 스트립과 C-형 스트립의 최대 용착속도 비교실험··········· 213.1 서언 ·························································································· 213.2 실험 재료 및 방법 ······································································ 213.2.1 실험 재료 ·············································································· 213.2.2 실험 방법 ·············································································· 233.3 실험결과 및 고찰 ······································································· 243.4 결언 ························································································· 30제 4 장 광폭비드 확보를 위한 용접 조건 변경 실험 ······························· 314.1 서 론 ························································································ 314.1.1 연구 배경 및 필요성 ······························································ 314.1.2 연구 목적 및 개요 ································································· 314.2 위빙폭과 비드폭의 관계 검토 실험 ··············································· 324.2.1 실험재료 및 실험방법 ····························································· 324.2.2 실험결과 및 고찰 ··································································· 344.3 드웰타임과 비드폭의 관계 검토 실험·············································· 364.3.1 실험재료 및 실험방법 ······························································ 364.3.2 실험결과 및 고찰 ···································································· 384.4 용접 전류와 비드폭의 관계 검토 실험 ············································ 414.4.1 실험재료 및 실험방법 ······························································ 414.4.2 실험결과 및 고찰 ···································································· 424.5 실드가스 중 He 함량과 비드폭의 관계 검토 실험····························· 454.5.1 실험재료 및 실험방법 ······························································ 454.5.2 실험결과 및 고찰 ···································································· 464.6 결언 ·························································································· 48제 5 장 결론 ······················································································ 49참고문헌 ····························································································· 51
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