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In-Situ Post-Weld Heat Treatment of Wet Welds
Offshore Technology Conference, 19921.0 Introduction There is a substantial interest in implementing wet welding for structural repairs of offshore installations. Some of the restrictions to its use are heat affected zone (HAZ) hardening and cracking, and the inability to produce wet welds that meet the bend test requirements of a surface weld ...
Peter Szelagowski +3 more
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Residual Stress Relief in Post-Weld Heat Treatment
Volume 6: Materials and Fabrication, Parts A and B, 2008This paper focuses on analysis of weld residual stress relief process during furnace-based uniform post-weld heat treatment (PWHT). Two classes of pressure vessel steels: 2-1/4CrMo and carbon steel are considered in seam weld configurations. It is found that the dominant mechanism for residual stress relief is the creep relaxation that occurs much ...
Pingsha Dong, Jeong K. Hong
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Welding, Repair and Local Post Weld Heat Treatment Residual Stresses
Volume 2: Computer Technology & Bolted Joints; Design & Analysis, 2023Abstract The study presented deals with an industrial case and relates to the calculation of the residual stresses in a butt weld of two shells of large diameter, high thickness and great length constituting part of pressure equipment. After completion of the weld, it can be repaired if unacceptable defects are detected ...
François Billon +4 more
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Stress Effect on Post-Weld Heat Treatment Embrittlement
1990Post-weld heat treatment (PWHT) is carried out to improve fracture toughness and to remove residual stress in the heat-affected zone (HAZ). There are some problems, such as a toughness decrease and stress-relief cracking (SRC) in the coarse-grained HAZ subject to the effect of the tempering treatment. Therefore, in this paper, the effect of the heating
J-K Lim, S-H Chung
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Local Post Weld Heat Treatment of a Pressure Vessel: A Postmortem Evaluation
Volume 2: Computer Technology & Bolted Joints; Design & Analysis, 2023Abstract This study is a postmortem evaluation of a process tower that suffered significant distortion after a local post weld heat treatment (PWHT). After installation of new nozzles near the base of the pressure vessel, heat treatment was performed to alleviate welding residual stresses in-situ, using a bulls-eye heating coil ...
Simon Yuen +5 more
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FCAW process to avoid the use of post weld heat treatment
International Journal of Pressure Vessels and Piping, 2006Abstract Post weld heat treatment (PWHT) is the most common technique employed for relieving residual stresses after general repair welding. Besides, the primary purpose of reducing the effect of stresses induced by welding, PWHT is also intended to temper the metallurgical structure of the heat-affected zone (HAZ).
A. Aloraier, R. Ibrahim, P. Thomson
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Optimisation of post-weld heat treatment — A simple, practical method
Sadhana, 2003The authors have evolved an empirical method for characterizing resistance to ductile fracture using two parameters Γ f andηf that can be determined from tensile test data of smooth cylindrical specimens. This method stipulates that the post-necking regime during tensile deformation is dominated by microvoid growth ...
P. Rodriguez, S. K. Ray, A. K. Bhaduri
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IN792 DS Superalloy: Optimization of EB Welding and Post-Welding Heat Treatments
Materials Science Forum, 2016Electron beam (EB) welding has been used to realize the seams on 2 mm thick plates of directionally solidified (DS) IN792 superalloy. A grid of the samples has been prepared by varying the pass speed v from 1 to 2.5 m/min, while the other process parameters (power P = 1 kW, acceleration voltage T = 50 kV, beam current I = 20 mA) were kept constant ...
Barbieri G. +4 more
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Improvement of Post Weld Heat Treatment Rules on Welded Joints
1989In order to improve the post weld heat treatment rules on welded joints, a cooperative programme of research, sustained by the Minsistry of Research and Technology has been set up on 1985. The study concerning the behaviour to fracture of as welded and post weld heat treated joints in SE 701 steel with great sizes permitted to lay down the influence of
J. Gilgert +5 more
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Post Weld Heat Treatment of Friction Stir Welded AA2017
2012In this study a friction stir welded AA2017 is post weld heat treated at 500 °C for holding time of 20, 40 and 60min then quenched in water and naturally aged. The effect of post weld heat treatment on the microstructure and hardness is investigated across the transverse cross section of the weld.
M. M. Z. Ahmed, B. P. Wynne
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