Results 231 to 240 of about 13,984 (274)

Stress Effect on Post-Weld Heat Treatment Embrittlement

1990
Post-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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Optimisation of post-weld heat treatment — A simple, practical method

Sadhana, 2003
The 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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FCAW process to avoid the use of post weld heat treatment

International Journal of Pressure Vessels and Piping, 2006
Abstract 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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Local Post Weld Heat Treatment of a Pressure Vessel: A Postmortem Evaluation

Volume 2: Computer Technology & Bolted Joints; Design & Analysis, 2023
Abstract 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, A. Boyd McKay, Daniel McArthur, Henry Kwok, John Fernando, Leanne Wong   +5 more
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IN792 DS Superalloy: Optimization of EB Welding and Post-Welding Heat Treatments

Materials Science Forum, 2016
Electron 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., Soltani P., Kaciulis S., Montanari R., Varone A.   +4 more
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Evaluation of the post-welding heat treatment effect on compatibility with hydrogen.

Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information
The article covers effect of post-weld heat treatment (PWHT) on the properties of thermo-mechanically treated (TMT) pipeline steel in interaction with hydrogen gas. The object of the study were specimens of the base metal and longitudinal welded joints of X65 large diameter pipes in the initial state (after TMT) and after PWHT.
A. B. Gizatullin, N. A. Devyaterikova, K. A. Laev, A. A. Khudnev, R. D. Shakirov, A. A. Fedyaev, D. A. strekal_da@spbstu.ru   +6 more
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A viscoplastic model for numerical simulation of welding and post-weld heat treatment

Le Journal de Physique IV, 1999
A viscoplastic model is developed to perform numerical simulation of welding and post-weld heat treatment in an industrial context. It can describe with the same formalism the steel inelastic behaviour all along the process: time-independent plastic at low temperature, viscoplastic at higher temperature and viscous fluid for melted metal.
A. Razakanaivo, F. Waeckel
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Improvement of Post Weld Heat Treatment Rules on Welded Joints

1989
In 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, J. A. Le Duff, D. Baptists, D. Francois, P. Balladon, J. P. Doucet   +5 more
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Post Weld Heat Treatment of Friction Stir Welded AA2017

2012
In 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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Low stress welding technology without post-weld heat treatment

Materials Science and Technology, 2009
In order to assure the tightness and the service life of a full welded body ball valve, the temperature of grommet cannot exceed 150°C. Therefore, post-weld heat treatment cannot be used to relieve the welding residual stresses. In this study, a low stress welding technology was studied.
J. J. Xu, L. G. Chen, C. Z. Ni
openaire   +1 more source