Research Papers: Materials and Fabrication

Residual Stress Reduction in Single Pass Welds Using Parallel Line Reheating

[+] Author and Article Information
Junqiang Wang, Weijing Li, Zhiyong Yang, Yingxin Zhao

School of Mechanical,
Electronic and Control Engineering,
Beijing Jiaotong University,
Beijing 100044, China

Jianmin Han

School of Mechanical,
Electronic and Control Engineering,
Beijing Jiaotong University,
Beijing 100044, China
e-mail: jhan@bjtu.edu.cn

Joseph P. Domblesky

Mechanical Engineering Department,
Marquette University,
1515 West Wisconsin Avenue,
Milwaukee, WI 53201 1881

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 8, 2015; final manuscript received September 2, 2015; published online October 6, 2015. Assoc. Editor: Xian-Kui Zhu.

J. Pressure Vessel Technol 138(2), 021402 (Oct 06, 2015) (9 pages) Paper No: PVT-15-1092; doi: 10.1115/1.4031548 History: Received May 08, 2015; Revised September 02, 2015

Current postweld heat treatment (PWHT) methods rely mainly on static thermal sources or line heating using dispersed beams which require significant capital investment and often pose limits on weldment size. In the current study, an alternative PWHT method based on line heating is presented and analyzed. The method, which is intended to perform low temperature stress relief, employs parallel oxyacetylene torches to induce a tensile stress in the vicinity of the weld toe. X-ray diffraction (XRD) measurements taken from bead-on-plate (BOP) welds made using ASTM A572-50 showed a 37% decrease in the peak longitudinal stress after parallel line reheating was performed. A corresponding reduction in the stress gradient on the plate surface was also observed. Welding and reheating were also modeled in sysweld to assess how torch placement affected the longitudinal stress distribution and an optimum offset was identified for the 8-mm plate thickness used. Analysis of the thermomechanical history in the vicinity of the weld toe indicates that a tensile stress is superposed during reheating and is concurrent with the reduction in the peak longitudinal stress.

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Fig. 1

Schematic representation of the five rod frame used to analyze residual stress development during welding and reheating

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Fig. 2

Illustration of longitudinal stress-thermal cycles occurring in a plate during (a) welding and (b) reheating based on a modification of Wells' model

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Fig. 7

Schematic representation showing (a) double ellipsoid and (b) Gauss heating source models

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Fig. 6

Mechanical and thermophysical parameters of ASTM A572-50 steel shown as a function of temperature

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Fig. 5

FE mesh used in the welding and reheating simulation models with plate dimensions and location of surface nodes used for residual stress validation indicated

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Fig. 4

Plate surface showing locations where XRD readings were taken before and after reheating

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Fig. 3

Photographs showing (a) experimental setup and (b) close-up of the reheating process in operation

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Fig. 8

Comparison of simulated and experimental longitudinal stresses at the plate surface after (a) welding and (b) reheating. All readings were taken at midlength of the weld.

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Fig. 9

Effect of torch offset distance on the peak longitudinal stress value in BOP welds made on ASTM 572-50 plates

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Fig. 10

Transverse cross section of the FE model indicating the center of the peak stress field after welding (location is indicated by B)

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Fig. 11

Plot showing the longitudinal stress-temperature history at B during welding and reheating

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Fig. 12

Longitudinal stress history at B during reheating of an initially stress free plate

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Fig. 13

Strain-temperature history at B during (a) welding and (b) reheating processes




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