Effect of Preheat on Residual Stress Distributions in Arc-Welded Mild Steel Plates

Adedayo, S. M.; Adeyemi, M.B.

doi:10.1361/105994900770346213

Cited by 8 publications

(2 citation statements)

References 1 publication

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“…The cooling rate of the weld zone and its adjacent region can be altered by introducing a preheat temperature to minimize the induced residual stresses. Adedayo and Adeyemi 44 observed around 65% reduction in residual stress magnitudes at the surface of the weld zone by the application of 200°C preheat temperature. For the present investigation, three different homogeneous preheat temperatures (202°C, 308°C, and 408°C) were obtained in the FE model of CG-26 (10 passes) at the initial modeling step.…”

Section: Resultsmentioning

confidence: 97%

Evaluation of through-thickness residual stresses and microstructure in SA516 Gr. 70 steel welds

Taraphdar

Mahapatra

Pradhan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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The critical working condition of nuclear power plant equipment necessitates meticulous determination of the welding process and parameters. In this work, some major influential factors of welding were investigated to observe their effects on the through-thickness residual stress distribution in multipass pressure vessel steel welds. In this regard, experiments were conducted to find the characteristics of residual stresses dispersed in SA516 Grade 70 steel welds of different groove geometries with distinct welding conditions. Three-dimensional finite element models of the weldments were developed considering a moving heat source with temperature-dependent material properties to simulate the welding thermal cycles and corresponding residual stress fields. Effects of weld groove geometry, number of weld passes, external constraints, and preheating on the through-thickness residual stress fields were studied. Additional attention was given to the evaluation of the heterogeneous microstructure and microhardness across the weld cross-section associated with their weld thermal history. Finally, the evolution of the through-thickness residual stresses attributed to subsequent weld passes was elaborated.

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Section: Resultsmentioning

confidence: 97%

Evaluation of through-thickness residual stresses and microstructure in SA516 Gr. 70 steel welds

Taraphdar

Mahapatra

Pradhan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Pipe spool P Aw 2 (to be denoted as "P Aw 2" for the residual stress measurement in as-welded condition) was preheated on both sides. Preheating is intended to avoid hydrogen cracking, the effect (if any) of preheating [20], [21] on welding residual stresses was also part of the investigation in the study.…”

Section: Welding Proceduresmentioning

confidence: 99%

Residual Stress State of X65 Pipeline Girth Welds Before and After Local and Furnace Post Weld Heat Treatment

Ren

Paradowska

Wang

et al. 2017

Journal of Pressure Vessel Technology

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This research investigated the effects of global (in other words, furnace-based) and local post weld heat treatment (PWHT) on residual stress (RS) relaxation in API 5L X65 pipe girth welds. All pipe spools were fabricated using identical pipeline production procedures for manufacturing multi-pass narrow gap welds. Non-destructive neutron diffraction (ND) strain scanning was carried out on girth welded pipe spools and strain-free comb samples for the determination of the lattice spacing. All residual stress 1 Corresponding author information can be added as a footnote.Journal of Pressure Vessel Technology 2 measurements were carried out at the KOWARI strain scanning instrument at the Australian Nuclear Science and Technology Organization (ANSTO).Residual stresses were measured on two pipe spools in as-welded condition and two pipe spools after local and furnace PWHT. Measurements were conducted through the thickness in the weld material and adjacent parent metal starting from the weld toes. Besides, three line-scans along pipe length were made 3mm below outer surface, at pipe wall mid-thickness and 3mm above the inner surface. PWHT was carried out for stress relief; one pipe was conventionally heat treated entirely in an enclosed furnace and the other was locally heated by a flexible ceramic heating pad. Residual stresses measured after PWHT were at exactly the same locations as those in as-welded condition.Residual stress states of the pipe spools in as-welded condition and after PWHT were compared and the results were presented in full stress maps. Additionally, through-thickness residual stress profiles and the results of one line scan (3mm below outer surface) were compared with the respective residual stress profiles advised in British Standard BS 7910 "Guide to methods for assessing the acceptability of flaws in metallic structures" and the UK nuclear industry's R6 procedure. The residual stress profiles in as-welded condition were similar. With the given parameters, local PWHT has effectively reduced residual stresses in the pipe spool to such a level that it prompted the thought that local PWHT can be considered a substitute for global PWHT.

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Experimental Study of the Effects of Welding Depth and Heat Treatment on Residual Stresses in a Cracked Rotor

Amirian

Torshizi

Bolagh

2020

J Fail. Anal. and Preven.

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Effect of Preheat on Residual Stress Distributions in Arc-Welded Mild Steel Plates

Cited by 8 publications

References 1 publication

Evaluation of through-thickness residual stresses and microstructure in SA516 Gr. 70 steel welds

Evaluation of through-thickness residual stresses and microstructure in SA516 Gr. 70 steel welds

Residual Stress State of X65 Pipeline Girth Welds Before and After Local and Furnace Post Weld Heat Treatment

Experimental Study of the Effects of Welding Depth and Heat Treatment on Residual Stresses in a Cracked Rotor

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