Numerical investigation on fluid transport phenomena in electron beam welding of aluminum alloy: Effect of the focus position and incident beam angle on the molten pool behavior

Aluminum and titanium alloys are among the most important and the most frequently used construction materials due to their physical and mechanical properties. Especially in the automotive and aerospace industry these materials allow to reduce the weight of structure which leads to reducing fuel consumption and environment pollution. These materials are often used together which leads to problems with junction between these materials. In addition to the mechanical joints, there is an effort to produce quality welded joints. Series of works focused to welding of Al/Ti joints by conventional and nonconventional welding methods were published [1, 4, 5, 6, 7]. By reduction of dimensions of molten material is possible to reduce the amount of emerging intermetallic phases and welding defects. Electron beam welding appears as suitable method for welding Al/Ti joints because it allows production of very narrow welds. The benefit is also necessity to perform electron beam welding in vacuum which is required for decrease energy losses of incident beam and simultaneously prevents reaction of molten metal with ambient atmosphere. This paper is focused to determine of appropriate parameters for electron beam welding of heterogeneous welds of titanium alloy Ti-6Al-4V and aluminum alloy 6061. Metallographic evaluation, analysis of chemical and phase composition were performed on the test welds for purpose to describing present phases. On the selected welds was evaluated the influence of intermetallic phases on the mechanical properties. The obtained results will be used for further experiments focused to optimize the process of electron beam welding of Al/Ti alloys.

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Numerical analysis of thermal fluid transport behavior during electron beam welding of 2219 aluminum alloy plate

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(17)60153-5 ◽

2017 ◽

Vol 27 (6) ◽

pp. 1319-1326 ◽

Cited By ~ 9

Author(s):

Cheng-cai LIU ◽

Jing-shan HE

Keyword(s):

Aluminum Alloy ◽

Electron Beam ◽

Numerical Analysis ◽

Fluid Transport ◽

Electron Beam Welding ◽

Alloy Plate ◽

Transport Behavior ◽

2219 Aluminum Alloy ◽

Aluminum Alloy Plate

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Effect on LY12 Aluminum Alloy Welding Joint Microstructure and Properties with Electron Beam Welding Technical Parameters

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.475-476.1275 ◽

2013 ◽

Vol 475-476 ◽

pp. 1275-1279

Author(s):

Qiang Zheng ◽

Cheng Gang Yang ◽

Yu He ◽

He Chen ◽

Ai Wu Yu

Keyword(s):

Aluminum Alloy ◽

Electron Beam ◽

Weld Metal ◽

Heat Affected Zone ◽

Welding Speed ◽

Electron Beam Welding ◽

Beam Current ◽

Electron Beam Current ◽

Micro Hardness ◽

Technical Parameters

LY12 aluminum alloy was welded with vacuum electron beam welding, the effect of welding speed and electron beam current on the weld microstructure and mechanical properties of welding joints were studied, the results were shown that with the increasing of welding speed or decreasing of electron beam current, the grains in weld metal were refined, so the joint strength were increased. When the electron beam current was 18mA, the welding speed was 1000mm/min, the grains of weld metal were the finest, and the tensile strength was 373.2MPa. In addition, the micro-hardness of weld metal was much lower than base metal and heat affected zone, and the heat affected zone had certain softening phenomenon. With the increasing of welding speed or decreasing of electron beam current, the micro-hardness of weld metal was increased respectively.

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