미스트 냉각을 적용한 스테인레스 박판의 용접변형 저감

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deformation", "residual stress", "mist cooling" "STS304

The Welding Deformation Reducing Of Stainless Steel Thin Plates By Applying Mist Cooling

Min-Ju Na
Advisor : Prof. Sung-min Joo, Ph. D.
Department of Welding and Joining Science Engineering,
Graduate School of Chosun University

The welding of the sheet metal is often problematic because the distortion of thin sheet is a common phenomenon resulting from the welding process. The main problem with welding is to keep the distortion as low as possible and to reduce the residual stresses. The residual stresses and distortions of structures by welding have a negative effect on the safety of mechanical structures. That is, the expansion of material by high temperature and distortion by cooling during welding process is caused by tensile and compressive residual stresses in welding material, and this residual stresses can induce fracture and fatigue problems of welding structures. Residual stresses are produced in weldments due to mismatching and non-uniform distributions of plastic and thermal strains. So Attempts were made to reduce the residual stresses produced in TIG welding process using Air atomizer. Spray water cooling is an important technology used in the industry for the cooling of materials from temperatures up to 1800k. Mist cooling was conducted into the gas tungsten arc welding trailing. How a trailing heat sink can be used for control of welding induced buckling distortion on thin plate structures. In this paper, regarding residual stresses distributions, Out-of-plane deformation, temperature histories and mechanical properties were measured. The accurate prediction of residual stress and deformation is very important to improve the quality of weldments.
Alternative Title
The Welding Deformation Reducing Of Stainless Steel Thin Plates By Applying Mist Cooling
Alternative Author(s)
Min-Ju Na
일반대학원 용접·접학과학공학
Awarded Date
Table Of Contents

List of Figures Ⅲ
List of Tables Ⅳ
Abstract Ⅴ

1장. 서 론 1
제 1절 연구배경 1 제 2절 연구동향 2
제 3절 연구목적 3

2장. 이론적 배경 4
제 1절 용접 잔류응력 및 변형 4
1.1 용접잔류응력 발생 메커니즘 4
1.2 용접변형의 발생 원인과 종류 7
1.3 용접변형 방지 및 저감 대책 10
1.4 잔류응력 계측방법 16
제 2절 이류체노즐(Air atomizer) 19
제 3절 금속재료 용접 20
3.1 스테인리스강 20
3.2 가스 텅스텐 아크 용접(GTAW) 22
3장. 실험방법 26
제 1절 사용 재료 및 용접조건 26
1.1 시험편 및 용접재료 26
1.2 용접 및 이류체노즐 조건 28

제 2절 장치 구성 29
제 3절 실험방법 30
3.1 면외변형량 계측 29
3.2 온도분포이력 측정 31
3.3 잔류응력 계측 32
3.4 인장강도 및 경도 측정 33
4장. 결과 및 고찰 35
제 1절 Bead on plate 및 Heat sink welding 분석 35
1.1 면외변형량 35
1.2 온도분포이력 36
1.3 잔류응력 39
1.4 인장강도 및 경도 41
1.5 공정별 시편 비교 43

5장. 결 론 44

참고문헌 45
나민주. (2016). 미스트 냉각을 적용한 스테인레스 박판의 용접변형 저감.
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General Graduate School > 3. Theses(Master)
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