Circumferential welding of gas pipeline pipes using hybrid technology with fibre-delivered LASER beamPaper presented at the 4th National Welding Day, Workshop: “New frontiers in LASER beam welding, friction stir welding and electron beam welding processes” Genova, 25–26 October 2007.

2009 ◽  
Vol 23 (6) ◽  
pp. 450-459 ◽  
Author(s):  
M. Fersini ◽  
G. Demofonti ◽  
S. Sorrentino ◽  
E. Mecozzi
Keyword(s):  
Electron Beam ◽  
Friction Stir Welding ◽  
Laser Beam ◽  
Electron Beam Welding ◽  
Laser Beam Welding ◽  
Gas Pipeline ◽  
Hybrid Technology ◽  
Friction Stir ◽  
Welding Processes

Microstructure and Corrosion Behavior of Cast A356 and Wrought AA6061 Aluminium Alloy Welds

2010 ◽  
Vol 117 ◽  
pp. 37-42
Author(s):  
K.Ratna Kumar ◽  
G. Madhusudhan Reddy ◽  
K. Srinivasa Rao
Keyword(s):  
Corrosion Resistance ◽  
Electron Beam ◽  
Friction Stir Welding ◽  
Arc Welding ◽  
Electron Beam Welding ◽  
Gas Tungsten Arc Welding ◽  
Fusion Welding ◽  
Friction Stir ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

In this work, it was intended to improve the corrosion resistance of welds of A356 and AA6061 by adopting mainly a special welding techniques, viz., pulsed current gas tungsten arc welding (PCGTAW), electron beam welding (EBW) and friction stir welding (FSW). It was found that the corrosion resistance of A356 and AA6061 welds could be improved by PCGTAW technique rather than continuous current gas tungsten arc welding (CCGTAW). It can be further improved by using electron beam welding. Improved corrosion resistance in A356 welds could be obtained by selecting T6 temper rather than as cast condition. In the case of AA6061, improved corrosion resistance was achieved by selecting T4 temper rather than T6 temper. As for as the welding techniques, friction stir welding (FSW) is useful than fusion welding techniques like CCGTAW,PCGTAW and EBW for improving the corrosion resistance of both the welds.

A Study on Different Welding Processes of IN718 for Elevated Temperature Application

2015 ◽  
Vol 1125 ◽  
pp. 186-189
Author(s):  
Kyung Ju Min ◽  
Jong Hoon Yoon ◽  
Joon Tae Yoo ◽  
Ho Sung Lee
Keyword(s):  
Elevated Temperature ◽  
Laser Beam ◽  
Electron Beam Welding ◽  
Hot Isostatic Pressing ◽  
Laser Beam Welding ◽  
Superplastic Forming ◽  
Internal Cooling ◽  
Cooling Channels ◽  
Solid Solution Strengthening ◽  
Welding Processes

Alloy IN718 is a nickel based precipitation hardened material and it has the necessary strength over a range of temperatures which includes the operating range for many rocket propulsion systems and jet engines. This performance is accomplished by a combination of solid-solution strengthening, precipitation strengthening and grain-boundary strengthening. However, it is common for precipitation hardened nickel based superalloys to have a problem of post-weld cracking. In this study, several welding processes are investigated to obtain the optimum welding method of IN718 for elevated temperature forming. These include LBW(Laser Beam Welding), EBW(Electron Beam Welding), HIP(hot isostatic pressing), and solid state diffusion bonding. The result shows that the LBW specimen performs the highest formability at 980°C so that this process can be applied to superplastic forming of IN718 sheet. It is demonstrated that the elevated temperature superplastic forming of nozzle extension with internal cooling channels was possible with laser beam welded IN718 sheet.

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