Super-TIG에 의한 고용착 Narrow Gap 맞대기용접 공정 개발에 관한 연구
- Abstract
- Narrow gap welding must be needed when the butt welding for thick plates is applied. Because the deformation and welding cost is reduced by decrease of cross-sectional area. However, narrow gap cause defects such as lack of fusion since it has small groove angle and narrow width.
Therefore, GMAW, GTAW and SAW are used to narrow gap welding, in these case, low deposition rate must be applied to avoid defects such as lack of fusion.
In this study, it is confirmed that the deposition rate of Super-TIG welding was very high as 7kg/hr for the narrow gap with groove angle 15˚. And by using Super-TIG welding, melting depth of groove surface was stable, therefore it can be said that the welding is robust process.
It is considered that Super-TIG welding is economic to compare with GMAW and SAW.
Finally, in case of Super-TIG welding, spatter and fume is not generated, and flux is not used, therefore it can be said that the process is eco-friendly, safe and healthy.
- Issued Date
- 2016
- Awarded Date
- 2016. 2
- Type
- Dissertation
- Publisher
- 부경대학교 대학원
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 신소재시스템공학과
- Advisor
- 조상명
- Table Of Contents
- 목 차
Abstract ······························································································ ⅲ
제 1 장 서 론 ························································································
1 1.1 연구 배경 및 필요성 ······································································· 1
1.2 연구 목적 및 개요 ·········································································· 4
제 2 장 이론적 배경 ··············································································· 5
2.1 TIG(tungsten inert gas) 용접 ························································· 5
2.1.1 GTAW의 정의 ··········································································· 5
2.1.2 GTAW의 원리 ··········································································· 5
2.1.3 GTAW의 장단점 ········································································ 6
2.2 GTAW 용접기 및 재료 ··································································· 8
2.2.1 용접기 ······················································································ 8
2.2.2 용접토치 ·················································································· 10
2.2.3 용접재료 ·················································································· 11
2.3 Narrow gap 맞대기용접 ······························································· 13
2.4 Melting depth의 정의 및 측정방법 ················································ 16
2.5 Fusion line의 정의 ····································································· 18
2.6 아크압력분포로부터 열유속분포의 유도를 위한 개념 ························· 21
2.7 TIG 용접의 용가재 송급속도에 따른 용가재 투입열량 ······················· 25
2.8 Plasma stream 이론의 개념 ·························································· 26
2.9 Plasma stream 이론의 관점에서 본 Super_TIG welding ·················· 28
제 3 장 Super-TIG 에 의한 Groove angle 20˚ 맞대기용접 실험··············· 30
3.1 서언 ·························································································· 30
3.2 실험 재료 및 방법 ······································································ 30
3.2.1 실험 재료 ·············································································· 30
3.2.2 실험 방법 ·············································································· 31
3.3 실험결과 및 고찰 ······································································· 33
3.3.1 실드가스 100% Ar, Ar+10%He의 실험결과······························· 33
3.3.2 실드가스 100% Ar, Ar+10%He의 고찰 ··································· 35
3.3.3 실드가스 Ar+30%He의 실험결과 ············································· 38
3.3.4 실드가스 Ar+50%He의 실험결과··············································· 42
3.4 결언 ························································································· 45
제 4 장 Super-TIG 에 의한 Groove angle 15˚ 맞대기용접 실험 ············· 46
4.1 실험 재료 및 방법 ······································································ 46
4.1.1 실험 재료 ·············································································· 46
4.1.2 실험 방법 ·············································································· 47
4.2 실험결과 및 고찰 ······································································· 49
4.3 결언 ························································································· 52
제 5 장 Narrow gap 용접비용 검토와 비교 ··········································· 53
5.1 서언 ·························································································· 53
5.2 용접비용 계산에 대한 전제조건 ···················································· 53
5.3 용접비용 계산방법 ······································································ 54
5.4 Super-TIG, GMAW, SAW 용접비용 비교 ····································· 55
제 6 장 결론 ······················································································ 60
참고문헌 ····························································································· 61
- Degree
- Master
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