Welding Residual Stress Analysis and Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel
Abstract
:1. Introduction
2. Materials and Methods
3. Residual Stress Analysis of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel
3.1. Numerical Analysis of Welding Residual Stresses
3.1.1. Numerical Analysis Procedure
3.1.2. Heat Source Model for Numerical Analysis
- q(0): maximum heat flux at the center of heating spot
- x: distance from the center of heating spot
- C: heat flux concentration coefficient
- Q: total heat input
- QS: surface heat input
- Qb: body heat input
3.2. Experimental Analysis of Welding Residual Analysis
3.3. Results and Discussion
4. Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint
4.1. Specimen and Test Procedure
4.2. Calculation of Stress Range Considering Welding Residual Stresses
- Se: fatigue strength
- Su: ultimate strength
4.3. Results and Discussion
5. Conclusions
- (1)
- Welding residual stresses at the weld of dissimilar welded joint distributed complicatedly on longitudinal and transverse directions. Results of numerical and experimental analysis showed a good agreement qualitatively.
- (2)
- Numerical and experimental peak values of welding residual stresses at HAZ of the weld on the 12Cr steel side were predicted to be 333 and 282 MPa HAZ, respectively.
- (3)
- The low fatigue limit of dissimilar material welded joint was assessed to be 306.8 MPa, which was 40% of tensile strength (767 MPa).
- (4)
- Stress range values without including welding residual stresses were 14% higher than those calculated by including the effect of residual stresses.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Base Material | Yield Strenght (MPa) | Tensile Strenght (MPA) | Elongation | Reduction in Area (%) | Melting Point (°C) |
---|---|---|---|---|---|
Alloy 617 | 322 | 732 | 62 | 56 | 1330 |
12Cr | 551 | 758 | 18 | 50 | 1375 |
Dissimilar material welded joint | 490 | 767 | 48 | - | - |
Base/Filler Metal | Chemical Composition (Weight %) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Ni | Cr | Co | Mo | Al | C | Fe | Si | Ti | Cu | Mn | S | |
Alloy 617 | 44.3 | 22 | 12.5 | 9.0 | 1.2 | 0.07 | 1.5 | 0.5 | 0.3 | 0.2 | 0.5 | 0.008 |
12Cr | 0.43 | 11.6 | - | 0.04 | - | 0.13 | Bal. | 0.4 | - | 0.1 | 0.58 | - |
Thyssen 617 | 45.7 | 21.5 | 11.0 | 9.0 | 1.0 | 0.05 | 1.0 | 0.1 | 1 | - | - | - |
Pass | Shield Gas | Voltage (V) | Current (A) | Welding Speed (cm/min) | Heat Input (kJ/mm) |
---|---|---|---|---|---|
1 | Argon-2.5% H2 | 10 | 150 | 10 | 0.9 |
2 | Argon-2.5% H2 | 13 | 150 | 10 | 1.17 |
3 | Argon-2.5% H2 | 16 | 150 | 10 | 1.44 |
4 | Argon-2.5% H2 | 16 | 150 | 10 | 1.44 |
5 | Argon-2.5% H2 | 16 | 150 | 10 | 1.44 |
6 | Argon-2.5% H2 | 16 | 150 | 10 | 1.44 |
7 | Argon-2.5% H2 | 16 | 150 | 10 | 1.44 |
Load Conditions | ||||||
---|---|---|---|---|---|---|
σmax (MPa) | 0.9σu = 690.3 | 0.8σu = 613.6 | 0.7σu = 536.9 | 0.6σu = 460.2 | 0.5σu = 383.5 | 0.4σu = 306.8 |
Stress Ratio | R = 0.1 | |||||
FrEquation | 10 Hz |
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Ahmad, H.W.; Hwang, J.H.; Lee, J.H.; Bae, D.H. Welding Residual Stress Analysis and Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel. Metals 2018, 8, 21. https://doi.org/10.3390/met8010021
Ahmad HW, Hwang JH, Lee JH, Bae DH. Welding Residual Stress Analysis and Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel. Metals. 2018; 8(1):21. https://doi.org/10.3390/met8010021
Chicago/Turabian StyleAhmad, Hafiz Waqar, Jeong Ho Hwang, Ju Hwa Lee, and Dong Ho Bae. 2018. "Welding Residual Stress Analysis and Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel" Metals 8, no. 1: 21. https://doi.org/10.3390/met8010021