Influence of electron beam welding parameters and metallurgical factors on intergranular liquation cracking susceptibility of cast alloy 718

2001 ◽  
Vol 7 (4) ◽  
pp. 349-357 ◽  
Author(s):  
Insu Woo ◽  
Chungyun Kang ◽  
Kazutoshi Nishimoto
Keyword(s):  
Electron Beam ◽  
Electron Beam Welding ◽  
Cast Alloy ◽  
Welding Parameters ◽  
Alloy 718 ◽  
Liquation Cracking ◽  
Cast Alloy 718

scholarly journals Development of Welding P92 Pipes Using the Reduced Pressure Electron Beam Welding Process for a Study of Creep Performance

2014 ◽  
Author(s):  
Nick Bagshaw ◽  
Chris Punshon ◽  
John Rothwell
Keyword(s):  
Electron Beam ◽  
Heat Input ◽  
Power Plants ◽  
Electron Beam Welding ◽  
Welding Process ◽  
Welding Parameters ◽  
Pipe Material ◽  
Reduced Pressure ◽  
Type Iv ◽  
Type Iv Cracking

Boiler and steam piping components in power plants are fabricated using creep strength enhanced ferritic (CSEF) steels, which often operate at temperatures above 550°C. Modification of alloy content within these steels has produced better creep performance and higher operating temperatures, which increases the process efficiency of power plants. The improved materials, however, are susceptible to type IV cracking at the welded regions. A better understanding of type IV cracking in these materials is required and is the basis of the Technology Strategy Board (TSB) UK funded VALID (Verified Approaches to Life Management & Improved Design of High Temperature Steels for Advanced Steam Plants) project. In order to study the relationship between creep performance and heat input during welding, several welds with varying amounts of heat input and resultant HAZ widths were produced using the electron beam welding process. The welding parameters were developed with the aid of weld process modeling using the finite element (FE) method, in which the welding parameters were optimized to produce low, medium and high heat input welds. In this paper, the modeling approach and the development of electron beam welds in ASTM A387 grade P92 pipe material are presented. Creep specimens were extracted from the welded pipes and testing is ongoing. The authors acknowledge the VALID project partners, contributors and funding body: Air Liquide, Metrode, Polysoude, E.ON New Build & Technology Ltd, UKE.ON, Doosan, Centrica Energy, SSE, Tenaris, TU Chemnitz, The University of Nottingham, The Open University and UK TSB. Paper published with permission.

Friction Stir Processing of Cast Alloy 718

2016 ◽  
pp. 505-511 ◽  
Author(s):  
Bharat K. Jasthi ◽  
Edward Chen ◽  
Brahmanandam Kaligotla ◽  
Todd Curtis ◽  
Michael West ◽  
...  
Keyword(s):  
Friction Stir Processing ◽  
Cast Alloy ◽  
Alloy 718 ◽  
Friction Stir ◽  
Cast Alloy 718

Influence of Electron Beam Technological Movements on Aluminium Alloy AW2099 Welded Joints Properties

2020 ◽  
Vol 994 ◽  
pp. 36-43
Author(s):  
Ján Urminský ◽  
Milan Marônek ◽  
Jozef Bárta ◽  
Michaela Lopatková ◽  
Róbert Hrušecký
Keyword(s):  
Electron Beam ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Welding Current ◽  
Welding Parameters ◽  
Porosity Formation ◽  
Surface Appearance ◽  
Current Focusing ◽  
Acceleration Voltage ◽  
Beam Oscillation

The electron beam welding (EBW) parameters have significant influence on weld surface appearance and porosity formation. Besides basic welding parameters, such as acceleration voltage, welding current, focusing current and welding speed, the beam oscillation during EBW plays an important role in weld metal formation and directly impacts the final welded joints properties. The influence of technological movements during EBW on the properties of aluminium-lithium alloy welded joints was studied. The same frequency and different amplitude as well as same amplitude and different frequency were chosen. The other welding parameters were constant.

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