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.

References

References
1.
Guo
,
C.
,
Han
,
C. J.
, and
Tang
,
Y. M.
,
2011
, “
Failure Analysis of Welded 0Cr13Al Tube Bundle in a Heat Exchanger
,”
Eng. Failure Anal.
,
18
(
3
), pp.
890
894
.10.1016/j.engfailanal.2010.11.003
2.
Otegui
,
J. L.
, and
Fazzini
,
P. G.
,
2004
, “
Failure Analysis of Tube–Tubesheet Welds in Cracked Gas Heat Exchangers
,”
Eng. Failure Anal.
,
11
(
6
), pp.
903
913
.10.1016/j.engfailanal.2004.01.003
3.
Allam
,
M.
, and
Bazergui
,
A.
,
2002
, “
Axial Strength of Tube-to-Tubesheet Joints: Finite Element and Experimental Evaluations
,”
ASME J. Pressure Vessel Technol.
,
124
(
1
), pp.
22
31
.10.1115/1.1398555
4.
Yan
,
H. G.
,
Zhang
,
B. S.
, and
Ge
,
L. T.
,
1996
, “
Research on Hydraulically Expanded Tube–Tubesheet Joints (II): Residual Contact and Friction Coefficient
,”
China Pressure Vessel Technol.
,
13
, pp.
309
313
.
5.
Su
,
W.
,
Ma
,
N.
,
Sang
,
Z.
, and
Widera
,
G. E. O.
,
2009
, “
Investigation of Fatigue Strength of Welded Tube-to-Tubesheet Joint
,”
Trans. ASME J. Pressure Vessel Technol.
,
131
(
4
), p.
041205
.10.1115/1.3122024
6.
Moorhead
,
A. J.
, and
Reed
,
R. W.
,
1980
, “
Internal Bore Welding of 2 1/4 Cr1Mo Steel Tube-to-Tubesheet Joints
,”
Weld. J.
,
59
(
1
), pp.
26
37
.
7.
Al-Badour
,
F.
,
Merah
,
N.
,
Shuaib
,
A. N.
, and
Bazoune
,
A.
,
2012
, “
Experimental and Finite Element Modeling of Friction Stir Seal Welding of Tube–Tubesheet Joint
,”
Adv. Mater. Res.
,
445
, pp.
771
776
.10.4028/www.scientific.net/AMR.445.771
8.
Duan
,
C. H.
, and
Qian
,
C. F.
,
2007
, “
Pull-Out Force Study of Tube-to-Tubesheet Joints in Heat Exchangers
,”
J. Beijing Univ. Chem. Technol.
,
34
(
3
), pp.
308
312
.10.3969/j.issn.1671-4628.2007.03.022
9.
Haijin
,
J.
,
2009
, WN75-100, The Specification for Application to the Project of BASF-YPC Company Limited.
10.
China National Standards Committee of Pressure Vessel
,
1999
,
GB151-1999, Tubular Heat Exchangers
,
Press of National Defense Industry
,
Beijing
.
11.
Sankov
,
N. I.
,
Leonov
,
G. P.
, Minin, V., 1984, “Fatigue Strength of Welded Joints of Tubes with Tube Plates,” Svar. Proizvod., 3, pp. 20–22.
12.
Acevedo
,
C.
,
Drezet
,
J. M.
, and
Nussbaumer
,
A.
,
2012
, “
Numerical Modelling and Experimental Investigation on Welding Residual Stresses in Large-Scale Tubular K-Joints
,”
Fatigue Fract. Eng. Mater. Struct.
,
36
, pp.
177
185
.10.1111/j.1460-2695.2012.01712.x
13.
Feng
,
A. H.
,
Chen
,
D. L.
, and
Ma
,
Z. Y.
,
2010
, “
Microstructure and Low-Cycle Fatigue of a Friction-Stir-Welded 6061 Aluminum Alloy
,”
Metall. Mater. Trans. A
,
41
, pp.
2626
2641
.10.1007/s11661-010-0279-2
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