Weld repair of grade 91 steel without post-weld heat treatment

2013 ◽  
Vol 17 (5) ◽  
pp. 312-317 ◽  
Author(s):  
S. J. Brett ◽  
K. C. Mitchell
Keyword(s):  
Heat Treatment ◽  
Post Weld Heat Treatment ◽  
Weld Repair ◽  
Grade 91 ◽  
Grade 91 Steel ◽  
Weld Heat

Integrity Analysis of a Vessel Subject to Weld Repair and Post-Weld Heat Treatment: Thermal Stress Distribution Using Numerical Approach

2020 ◽  
Vol 1000 ◽  
pp. 348-355
Author(s):  
Ardiyansyah Yatim ◽  
Gatot Prayogo ◽  
Ahmad Karayan ◽  
Hendra Novi ◽  
Wildan Hamdani ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Welding Process ◽  
Numerical Approach ◽  
Post Weld Heat Treatment ◽  
Thick Wall ◽  
Weld Repair ◽  
Element Analysis ◽  
Small Deflection ◽  
Integrity Analysis ◽  
Weld Heat

Here, we present a numerical approach to analyze the integrity of a vessel that was subject to a weld repair. A Post-Weld Heat Treatment (PWHT) process was implemented to a vessel undergone weld repair due to leakage. Due to the thick wall of the welded bottom head, this welding process must be followed by the PWHT to relieve the residual stress, as well as to improve the material properties. PWHT process was performed by heating the welded area to reach 675 °C temperature. A numerical approach using finite element analysis (FEA) method was performed to analyze the integrity of the vessel. Based on the analysis, the structure is still stable within the applied load. PWHT process does not lead to buckling on the main structure and the load is still lower than the load required for the occurrence of buckling. A sensitivity analysis was also performed with reduced temperatures to 630 °C or reduction of PWHT area width. These changes were found to have negligible effects in reducing the stress and strains in the vessel. After PWHT is completed, the structure is still considered to be safe to be operated, as indicated by its strain that is still below the allowable strain and only relatively small deflection was occurred.

Effect of filler wire and post weld heat treatment on the mechanical properties of laser beam-welded AA2198

2021 ◽  
pp. 111257
Author(s):  
Theano N. Examilioti ◽  
Nikolai Kashaev ◽  
Volker Ventzke ◽  
Benjamin Klusemann ◽  
Nikolaos D. Alexopoulos
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Laser Beam ◽  
Post Weld Heat Treatment ◽  
Filler Wire ◽  
Weld Heat
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