Results 221 to 230 of about 13,984 (274)
The influence of post-weld heat treatment on microstructure of TC4 weld joints
Materials Research Innovations, 2015 The effect of one two-step high-temperature post-weld heat treatment on the microstructure of TC4 weld joints has been studied in our experiment, and as a result, the weld joints with attractive mechanical property have been obtained. The weld joints consisted of lamellar martensitic α, retained β and primary α, therefore microstructure of the weld ...
J. Liu, H. Qiao, Y. Hu
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Analysis of residual stress relief mechanisms in post-weld heat treatment
International Journal of Pressure Vessels and Piping, 2014Abstract This paper presents a recent study on weld residual stress relief mechanisms associated with furnace-based uniform post-weld heat treatment (PWHT). Both finite element and analytical methods are used to quantitatively examine how plastic deformation and creep relaxation contribute to residual stress relief process at different stages of PWHT
Pingsha Dong, Shaopin Song
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Liquation and post-weld heat treatment cracking in Rene 80 laser repair welds [PDF]
Journal of Materials Processing Technology, 2012 An extensive experimental study on a nickel-based superalloy, Rene 80 using autogenous laser welding has been undertaken to determine the effect of the process parameters and weld bead geometry on cracking in the as-welded and post- weld heat treated ...
P Colegrove
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Welding Procedures and Post Weld Heat Treatment
2022All of the weld processes described in Chapter 7 are capable of producing high quality welds. As further described in that chapter, some processes are limited either by the process itself, or for practical reasons, to the production of certain types of welds. Regardless of the weld process or type, numerous variables affect weld quality.
Owen R. Greulich, Maan H. Jawad
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Hyperbaric Post Weld Heat Treatment
Offshore Technology Conference, 1983ABSTRACT This paper describes a sub-sea hyperbaric Post Weld Heat Treatment (PWHT) system developed jointly by SHELL UK EXPLORATION & PRODUCTION and COMEX DIVING. It discusses:Assessment of power requirements and equipment,Initial tests conducted in the COMEX hydrosphere and in shallow water in Marseille,Full ...
Stuart Saunderson, David Waller
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Post-weld heat-treatment cracking in superalloys
International Metals Reviews, 1983This review is concerned with a type of cracking that often occurs during the postweld heat-treatment of Ni-base superalloys. The metallurgical factors and process variables that influence crack sensitivity are discussed in detail. The various types of tests available to study this type of embrittlement and the limitations of each approach are briefly ...
R. Thamburaj, w. Wallace, J. A. Goldak
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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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