Residual stress measurements by neutron diffraction in multi-bead welding

The neutron diffraction technique is used to investigate and compare the residual stress characteristics in fully restrained samples with different numbers of beads. The aim of the research was to characterize the residual stress distribution which arises in a welded component with increasing the number of passes or beads. The resolution of the measurements carried out in this work achieves a new level of detail and reveals significant features of the residual stress pattern in multi-bead welding. The findings have important consequences for the design of welding procedures, demonstrating the effects of placing new beads on prior welding.

[1]  Marc Duquennoy,et al.  Ultrasonic characterization of residual stresses in steel rods using a laser line source and piezoelectric transducers , 2001 .

[2]  John W. H. Price,et al.  A neutron diffraction study of residual stress due to welding , 2005 .

[3]  H. Bhadeshia,et al.  Residual stress. Part 2 – Nature and origins , 2001 .

[4]  Xiaohua H. Cheng,et al.  Residual stress modification by post-weld treatment and its beneficial effect on fatigue strength of welded structures , 2003 .

[5]  G. Sarkar,et al.  Development and comparison of residual stress measurement on welds by various methods , 2004 .

[6]  Pingsha Dong,et al.  Welding Residual Stresses and Effects on Fracture in Pressure Vessel and Piping Components: A Millennium Review and Beyond , 2000 .

[7]  P. Withers,et al.  Residual stress relief in MAG welded joints of dissimilar steels , 2003 .

[8]  Pingsha Dong,et al.  Residual Stress Analyses of a Multi-Pass Girth Weld: 3-D Special Shell Versus Axisymmetric Models , 2001 .

[9]  P. Withers,et al.  Residual stress. Part 1 – Measurement techniques , 2001 .

[10]  Philip J. Withers,et al.  Neutron and synchrotron measurements of residual strain in TIG welded aluminium alloy 2024 , 2003 .

[11]  John W. H. Price,et al.  Potential guidelines for design and fitness for purpose for carbon steel components subject to repeated thermal shock , 2004 .

[12]  D. Kwon,et al.  Assessing welding residual stress in A335 P12 steel welds before and after stress-relaxation annealing through instrumented indentation technique , 2003 .