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Research Papers: Materials and Fabrication

Effect of Different Welded Structures on Mechanical Properties of TA2 Tube-to-Tubesheet Joints

[+] Author and Article Information
Xinlong Wei

Jiangsu Key Laboratory of Process Enhancement
and New Energy Equipment Technology,
School of Mechanical and Power Engineering,
Nanjing Tech University,
Nanjing 210009, China
e-mail: xlweinjut@163.com

Yang Qian

Jiangsu Key Laboratory of Process Enhancement
and New Energy Equipment Technology,
School of Mechanical and Power Engineering,
Nanjing Tech University,
Nanjing 210009, China
e-mail: qianyangspare@gmail.com

Junhui Wang

Jiangsu Key Laboratory of Process Enhancement
and New Energy Equipment Technology,
School of Mechanical and Power Engineering,
Nanjing Tech University,
Nanjing 210009, China
e-mail: zswangjunhui@163.com

Jianxin Zhou

Jiangsu Key Laboratory of Process Enhancement
and New Energy Equipment Technology,
School of Mechanical and Power Engineering,
Nanjing Tech University,
Nanjing 210009, China
e-mail: jxzh1973@163.com

Xiang Ling

Jiangsu Key Laboratory of Process Enhancement
and New Energy Equipment Technology,
School of Mechanical and Power Engineering,
Nanjing Tech University,
Nanjing 210009, China
e-mail: xling@njtech.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 11, 2013; final manuscript received January 17, 2014; published online April 3, 2014. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 136(4), 041403 (Apr 03, 2014) (5 pages) Paper No: PVT-13-1113; doi: 10.1115/1.4026566 History: Received July 11, 2013; Revised January 17, 2014

Four types of TA2 welded tube-to-tubesheet joints prepared by manual tungsten arc argon-shielded welding technique are studied in this paper. The pull-out tests and low cycle fatigue tests were performed to optimize welded structures of tube and tubesheet. The results show that fractures of welded TA2 tube and tubesheet samples occur at weld zone of TA2 steel tube for the pull-out tests and low cycle fatigue tests. The extension-tubesheet welded joints have the maximum pull-out forces and the best fatigue resistance, and the internal-bore welded joint with 45 deg bevel occupies second place. Fractures are both initiated from weld toe of the outside of tube for the pull-out tests and low cycle fatigue tests. Crack propagates along the direction of 45 deg for the pull-out test. However, crack propagates perpendicularly to the direction of the applied load for low cycle fatigue test, and then fractures immediately parallel to the direction of the applied load. Fatigue striations with a spacing of about 10 μm can be observed on the fatigue crack propagation zone. However, hemispheroidal dimples exist on instant rupture zone.

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References

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Figures

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Fig. 1

The dimensions of TA2 tube-to-tubesheet joint samples (mm)

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Fig. 2

Different welded joint structures of TA2 tube and tubesheet, (a) internal-bore welded joint with a bevel of 45 deg, (b) extension-tubesheet welded joint, (c) internal-bore welded joint with a bevel of U, and (d) flush-tubesheet welded joint

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Fig. 3

The pull-out test fixture

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Fig. 4

The optical micrograph of (a) TA2 base metal and (b) TA2 weld beam

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Fig. 5

Cross-section SEM morphologies of different welded structure shapes of TA2 tubes and tubesheets, (a) internal-bore welded joint with U bevel, (b) internal-bore welded joint with 45 deg bevel, (c) extension-tubesheet welded joint, and (d) flush-tubesheet welded joint with 45 deg bevel

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Fig. 6

The typical fracture morphologies of TA2 tube and tubesheet sample after pullout, (a) cross-section, and (b) fracture

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Fig. 7

Surface morphologies of TA2 tube after fatigue fracture

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Fig. 8

Fracture cross-section morphologies of TA2 tubes and tubesheet welded joints, (a) internal-bore welded joint with U bevel, (b) internal-bore welded joint with 45 deg bevel, (c) extension-tubesheet welded joint, and (d) flush-tubesheet welded joint with 45 deg bevel

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Fig. 9

Representative fractographs of TA2 tubes and tubesheet welded joints, (a) fatigue crack propagation zone, and (b) instant rupture zone

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