The study on the Mechanical Behavior of Butt Joint & T-Joint in Thick Plate Steel by Arc and Hybrid (CO2 Laser+MIG) Welding
- Issued Date
- 2007
- Abstract
- This work has been focused on characterization of both butt and T-joint Hybrid welding of AH 30 steel, process parameters optimization, mathematical modeling of the process, and its heat transfer and residual stress analysis.
Hybrid welding combines two different sources of radiations and offers many advantages compared to conventional arc welding processes. The main advantages of hybrid welding are reduction of laser power, higher welding speed, increased seam strength, better process stability, less stress fractures, and improved gap bridging. This paper mainly concentrate on the comparison of the thermal and mechanical characteristics of butt and T- joint of thick steel plate made using hybrid welding and conventional arc welding such as SAW and FCAW. Larger gap tolerance and high quality welding and better thermal and mechanical characteristic has been observed for hybrid welding method when compared to the conventional arc welding process.
- Alternative Author(s)
- Oh Chong-In
- Affiliation
- 조선대학교 선박해양공학과
- Department
- 일반대학원 선박해양공학과
- Awarded Date
- 2008-02
- Table Of Contents
- ABSTRACT
List of Figure
List of Table
Chapter 1 Introduction
1.1 Background to the Research
1.2 Literature Review
1.2.1 Characteristics of Submerged-Arc Welding
1.2.2 Characteristics of Flux Cored Arc Welding
1.2.3 Characteristics of MIG Welding
1.2.4 Characteristics of Laser Welding
1.2.5 Characteristics of Hybrid Laser-MIG Welding
1.3 Industrial Applications
1.3.1 Shipbuilding
1.3.2 Automotive
1.3.3 Pipe Lines and Offshore Installations
1.3.4 Aerospace and Aviation Industry
1.3.5 Power Generation
1.3.6 Off Road and Heavy Vehicles
1.4 Characteristics of AH32 Material
1.5 Research Hypothesis
1.6 Research Objectives
1.7 Methodology
1.8 Outline of the Report
Chapter 2 Theory of Analysis for Welding Processes
2.1 Introduction
2.2 Assumption of the Analysis
2.3 Basic Theory for Heat Transfer Analysis
2.4 Basic Theory for Thermal Elasto-Plastic Analysis
2.5 Mathematical models
2.5.1. Mathematical model of Arc welding Process
2.5.2. Mathematical model of Laser welding process
2.5.3. Mathematical model of Laser-Arc Process
Chapter 3 Fabrication of Optimum Specimen by Shape
3.1 Introduction
3.2 Fabrication of Butt Specimen
3.2.1 Fabrication of Butt Specimen by SAW Process
3.2.2 Selection of Welding Condition & Phenomenon for
Hybrid Welding Process .
3.3 Fabrication of T-Joint Specimen
3.3.1 Fabrication of T-Joint Specimen by FCAW Process
3.3.2 Selection of Welding Condition & Phenomenon for
Hybrid Welding Process
3.4 Summary
Chapter 4 Thermal Characteristics by Welding Processes
4.1 FE-Model & Simulation Condition for Heat Transfer
4.1.1 SAW & Hybrid Butt Welding
4.1.2 FCAW & Hybrid T-Joint Welding
4.2 Heat Transfer Analysis
4.2.1 Heat Distribution of Butt Welded Joint in SAW & Hybrid
Welding
4.2.2 Heat Distribution of T-Joint in FCAW & Hybrid Welding
4.3 Summary
Chapter 5 Mechanical Characteristics by Welding Processes
5.1 Simulation Condition for Welding Residual Stress
Analysis
5.1.1 SAW & Hybrid Butt Welding
5.1.2 FCAW & Hybrid T-Joint Welding
5.2 Welding Residual Stress & Strain Analysis
5.2.1 Welding Residual Stress & Strain Values of Butt
Welded Joint in SAW & Hybrid Welding
5.2.2 Welding Residual Stress & Strain Values of T-Joint in
FCAW & Hybrid Welding
5.3 Measurement of Welding Residual Stress in Workpiece
5.3.1 Compare of Welding Residual Stress Values between
Simulation & Experiment
5.4 Comparison of welding deformation
5.5 Summary
Chapter 6 Efficiency Test in Welds
6.1 The Hardness Distribution in Welds
6.2 Tensile Test in Welds
6.3 Bending Test in Welds
6.4 Impact Test in Welds
6.5 Micro-Structural Analysis of Welds
6.6 Summary
Chapter 7 Conclusions
Chapter 8 References
- Degree
- Doctor
- Publisher
- 조선대학교 일반대학원
- Citation
- 오종인. (2007). The study on the Mechanical Behavior of Butt Joint & T-Joint in Thick Plate Steel by Arc and Hybrid (CO2 Laser+MIG) Welding.
- Type
- Dissertation
- URI
- https://oak.chosun.ac.kr/handle/2020.oak/7021
http://chosun.dcollection.net/common/orgView/200000235925
- Appears in Collections:
- General Graduate School > 4. Theses(Ph.D)
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