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RESEARCH PAPERS

Measurement of Residual Stresses in a Type 316H Stainless Steel Offset Repair in a Pipe Girth Weld

[+] Author and Article Information
S. Hossain, D. J. Smith

Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, UK

C. E. Truman1

Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, UKc.e.truman@bristol.ac.uk

P. J. Bouchard

Structural Integrity, British Energy Generation Ltd., Barnwood, Gloucester, GL4 3RS, UK

1

Corresponding author.

J. Pressure Vessel Technol 128(3), 420-426 (Sep 23, 2005) (7 pages) doi:10.1115/1.2218346 History: Received August 17, 2004; Revised September 23, 2005

This paper presents measurements of the in-plane residual stress components through the wall of a 218mm long, 26mm deep repair weld, offset by 7mm from the centerline of a girth weld joining two type 316H stainless steel pipes approximately 37mm thick. The measurements were obtained using the deep hole drilling technique. Two locations were examined: (i) mid-length of the repair weld and (ii) the stop-end of the repair. Both measurements were taken along the girth weld centerline. The distributions and magnitudes of the measured longitudinal and transverse stress components at the two locations were very similar over the outer half of the pipe wall. Over the inner half of the pipe wall both components of stress were found to be significantly more compressive at the stop-end of the repair than at mid-length. In general, the transverse residual stresses were found to be lower than the longitudinal residual stresses at both locations. The measured stress profiles are compared with predicted residual stresses from a three-dimensional finite element analysis.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Arrangement of stainless steel pipe girth weld (dimensions in mm)

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Figure 2

Setup of butt-weld and offset repair weld (all dimensions in mm). (a) Schematic of axial cross section through original and repair weld preparations (dimensions in mm). GCL (original girth weld centerline); RCL (repair weld centerline). (b) Schematic of hoop cross section through repair weld excavation.

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Figure 3

Bead run sequence. (a) Original girth weld. (b) Repair weld.

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Figure 4

Locations of deep hole measurements. The location of end of cavity indicated by pockmarks “a” at the surface and “b” at the deepest point.

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Figure 5

Schematic illustration of the DH method

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Figure 6

Overall geometry of offset repair weld finite element model

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Figure 7

Geometry of original girth weld (light blue) and weld repair (red) at mid-length of repair

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Figure 8

316H parent material isotropic hardening stress-strain curves

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Figure 9

Measured residual stresses near the intersection of the girth centerline with the mid-length of the repair weld (hole 1)

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Figure 10

Measured residual stresses along the girth weld centerline at the stop end of the repair weld (hole 2)

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Figure 11

Measured residual stresses in a 218mm long, offset, 316H stainless steel repair weld compared with 3D FE predictions. (a) Longitudinal. (b) Transverse.

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