Abstract

By conducting curved wide plate tensile tests for girth welded joints of X80 line pipe containing a surface notch in the weld metal, the effects of strength matching on fracture performance were evaluated. Parametric studies were also conducted using a finite element method simulating the experiments to clarify the effects of strain hardening capacity of the base metal, softening in the heat affected zone, and groove configuration on fracture performance. A strain at failure significantly decreased with the decreasing strength matching. This was expected to be due to a difference in local straining behavior at the notch tip caused by the shielding effect. The analytical studies revealed that the strain hardening capacity of the base metal, the softening in the heat affected zone, and the groove configuration affected the allowable strain for a given toughness level in the case of overmatching. However, these factors hardly affected the allowable strain in the case of undermatching.

Issue Section:
Technical Papers
Keywords:
work hardening, pipes, welds, plates (structures), finite element analysis, fracture
Topics:
Base metals, Fracture (Materials), Metals, Pipes, Welded joints, Work hardening, Fracture (Process), Gages
1.
Mohr
,
B.
,
Gordon
,
R.
, and
Smith
,
R.
, 2004, “
Strain Based Design Guidelines for Pipelines
,”
Proc. 4th International Pipeline Technology Conference
,
R.
Denys
, ed., Ostend, Belgium, pp.
291
–
311
.
2.
American Petroleum Institute (API)
, 2004, “
Specification for Line Pipe
,”
API Specification 5L
, 43rd ed.,
API
, Washington, DC.
3.
Chaudhari
,
V.
,
Ritzmann
,
H. P.
,
Wellnitz
,
G.
,
Hillenbrand
,
H. G.
, and
Willings
,
V.
, 1995, “
German Gas Pipeline First to Use New Generation Line Pipe
,”
Oil & Gas J.
0030-1388,
93:1
January, pp.
40
–
47
.
4.
Glover
,
A.
, 2002, “
Application of Grade 550 (X80) and Grade 690 (X100) in Arctic Climates
,” Proc. International Pipe Dreamer’s Conference,
M.
Toyoda
, and
R.
Denys
, eds., Yokohama, Japan, pp.
33
–
52
.
5.
Masuda
,
T.
,
Hagiwara
,
N.
,
Yatabe
,
H.
,
Kawaguchi
,
S.
,
Motohashi
,
H.
, and
Fukuda
,
N.
, 2004, “
Application of X80 in Japan—Summary
,”
Proc. 4th International Pipeline Technology Conference
,
R.
Denys
, ed., Ostend, Belgium, pp.
31
–
39
.
6.
Motohashi
,
H.
,
Hagiwara
,
N.
, and
Masuda
,
T.
, 2004, “
Tensile Properties and Microstructure of Weld Metal of X80 Linepipe Steel
,” IIW Doc. XI-822-04.
7.
Motohashi
,
H.
,
Hagiwara
,
N.
, and
Masuda
,
T.
, 2005, “
Tensile Properties and Microstructure of Weld Metal in MAG Welded X80 Pipeline Steel
,”
Weld. Int.
0950-7116,
19
(
2
), pp.
100
–
108
.
Crossref
Search ADS
 
8.
Motohashi
,
H.
, and
Hagiwara
,
N.
, 2006, “
Effect of Heat Input on Mechanical Properties and Microstructure of Gas Metal Arc and Shielded Metal Arc Girth Weld Metal of X80 Line Pipe
,”
Q. J. Jpn. Weld. Soc.
0288-4771,
24
(
3
), pp.
223
–
232
(in Japanese).
Crossref
Search ADS
 
9.
Minami
,
F.
,
Ohata
,
M.
,
Toyoda
,
M.
,
Arimochi
,
K.
,
Glover
,
A.
, and
North
,
T.
, 1995, “
The Effect of Weld Metal Yield Strength on the Fracture Behavior of Girth Welds in Grade 550 Pipe
,”
Proc. International Pipeline Technology Conference
,
R.
Denys
, ed., Ostend, Belgium, pp.
441
–
461
.
10.
Horsley
,
D.
, and
Wang
,
Y. Y.
, 2004, “
Weld Mismatch Effects on the Strain Behavior of Flaws in X100 (Grade 690) Pipe and Girth Welds
,”
Proc. 4th International Pipeline Technology Conference
,
R.
Denys
, ed., Ostend, Belgium, pp.
267
–
277
.
11.
Wang
,
Y. Y.
,
Cheng
,
W.
,
McLamb
,
M.
,
Horsley
,
D.
,
Zhou
,
J.
, and
Glover
,
A.
, 2004, “
Tensile Strain Limits of Girth Welds with Surface-Breaking Defects—Part 1: An Analytical Framework
,”
Proc. 4th International Pipeline Technology Conference
,
R.
Denys
, ed., Ostend, Belgium, pp.
235
–
249
.
12.
Wang
,
Y. Y.
,
Horsley
,
D.
,
Cheng
,
W.
,
Glover
,
A.
,
McLamb
,
M.
, and
Zhou
,
J.
, 2004, “
Tensile Strain Limits of Girth Welds with Surface-Breaking Defects—Part 2: Experimental Correlation and Validation
,”
Proc. 4th International Pipeline Technology Conference
,
R.
Denys
, ed., Ostend, Belgium, pp.
251
–
266
.
13.
Denys
,
R.
,
De Waele
,
W.
,
Lefevre
,
A.
, and
De Baets
,
P.
, 2004, “
An Engineering Approach to the Prediction of the Tolerable Defect Size for Strain-Based Design
,”
Proc. 4th International Pipeline Technology Conference
,
R.
Denys
, ed., Ostend, Belgium, pp.
163
–
181
.
14.
Denys
,
R.
,
De Waele
,
W.
,
Lefevre
,
A.
, and
De Baets
,
P.
, 2004, “
Weld Strength Mismatch Effects on Plastic Straining Capacity of Axially Loaded Pipes
,”
Proc. 4th International Pipeline Technology Conference
,
R.
Denys
, ed., Ostend, Belgium, pp.
209
–
233
.
15.
Healy
,
J.
,
Billingham
,
J.
,
Billington
,
C.
, and
Bolt
,
H.
, 1995, “
Design Implications of the High Yield to Ultimate Ratio of High Strength Steels in Offshore Engineering
,”
Proc. International Conference of OMAE
,
American Society of Mechanical Engineers
, Vol.
3
, pp.
271
–
277
.
16.
Yurioka
,
N.
, 1995, “
TMCP Steels and their Welding
,”
Weld. World
0043-2288,
35
(
6
), pp.
375
–
390
.
17.
Japanese Industrial Standard
, 1999, “
MAG Welding Solid Wires for Mild Steel and High Strength Steel
,” JIS Z 3312.
18.
Hibbit
,
Karlsson
, and
Sorensen
, 2002,
ABAQUS Standard User’s Manual
, Ver. 6.3.
19.
Minami
,
F.
,
Ohata
,
M.
,
Toyoda
,
M.
,
Tanaka
,
T.
,
Arimochi
,
K.
,
Glover
,
A. G.
, and
North
,
T. H.
, 1995, “
Yield Strength Mis-match Effect on Fracture Performance of Girth Welded Joints of Grade 550 Pipeline Steel
,”
Proc. International Conference of OMAE
,
American Society of Mechanical Engineers
, Vol.
V
, pp.
145
–
159
.
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