Optimal parameters for low and high voltage electron beam welding of AZ series magnesium alloys and mechanism of weld shape and pore formation

Chi, Chao-Ting; Chao, Chuen−Guang; Liu, T.-F.; Wang, C.-C.

doi:10.1179/174329307x227274

Cited by 17 publications

(4 citation statements)

References 20 publications

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“…The process of electron beam welding was characterized and systematically investigated in welding trials in 2 mm sheet metal of TZM. The welding parameters accelerating voltage, beam deflection, and focus point were set constant, as the literature reports only little influence on weld quality [6], [9]. The varied parameters were chosen to be beam current, welding speed, pre-heat temperature, and post-weld heat treatment.…”

Section: Methodsmentioning

confidence: 99%

Electron Beam Welding of TZM Sheets

Stütz

Oliveira

Rüttinger³

et al. 2016

MSF

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In the scope of this work, 2 mm thick TZM sheet metal is butt welded by electron beam welding (EBW) without filler material and a systematic investigation of the most relevant welding parameters to improve the weld quality is conducted. With the aid of design of experiment (DoE), it is shown that with careful selection of the welding parameters it is possible to considerably reduce the size of the fusion zone and the heat affected zone and the grain size of both. Furthermore, the influence of the parameters on the quality of the weld and the characterizing values ultimate tensile strength and hardness of fusion zone is presented. It is concluded, which parameters influence the quality of the weld and suppress pores and cracks.

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Section: Methodsmentioning

confidence: 99%

Electron Beam Welding of TZM Sheets

Stütz

Oliveira

Rüttinger³

et al. 2016

MSF

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“…As stated by Messler [150] 'the overwhelming majority of bad-looking welds have not had good internal quality'. Therefore, this is why there are several studies regarding welding process optimisation aim at mitigation of the technical/process-related imperfections [32,37,[151][152][153][154][155][156][157]. The mitigation of these defects is possible via through understanding their formation mechanism.…”

Section: Tensile Propertiesmentioning

confidence: 99%

Critical review on fusion welding of magnesium alloys: metallurgical challenges and opportunities

Pouranvari

2021

Science and Technology of Welding and Joining

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As the lightest structural alloys, magnesium alloys offer significant potential for improving the energy efficiency of various transportation systems. The lack of sufficient weldability of Mg alloys is a crucial barrier to their potential use in safety-critical applications. Porosity formation, grain structure engineering, solidification cracking, liquation, and liquation cracking are the key metallurgical challenges to obtain reliable and robust fusion welds in Mg alloys. This critical review highlights the current understating regarding controlling the metallurgical phenomena during fusion welding of Mg alloys and discusses the unresolved metallurgical challenges to shed light on the path forward to enhance fusion weldability of Mg alloys.

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“…Another way is to reduce the gas composition in welding materials and base materials that go into the molten pool [8]. The optimization of welding parameters is usually the approach that is considered [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Mechanism to Reduce the Porosity during Argon Arc Welding of Aluminum Alloys by Changing the Arc Angle

Chen

Chi

Zhang

et al. 2020

Metals

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A mechanism to reduce the porosity by changing the arc angle during aluminum alloy welding was studied. Industrial computed tomography was used to scan the welds with different arc angles, and the scanned model was processed by a specific software package to obtain the digital size and position of weld pores. The forces acting on the pores in the molten pool explained the test results that the number of pores decreases and the average size increases. As the inclination angle of the arc increased, the vertical component that prevented the bubble from rising decreased, and the horizontal component that pushed the molten metal flow and promoted the nucleation and growth of the bubbles increased. A horizontal movement during the droplet transition as the arc inclination was produced, which was conducive to the growth and overflow of bubbles. The theoretical analysis and temperature field measured by a far-infrared with different torch angle showed that when the arc was tilted from 0, the shape of the molten pool changed from the circle to the ellipse. The long axis of the ellipse increased as the bevel angle of the arc increased. This showed that the molten metal existed a longer time for the bubbles to escape from the molten pool when the angle of the arc increased. The paper provides fundamental insights into a mechanism for porosity reduction during the welding of Al alloys.

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Optimal parameters for low and high voltage electron beam welding of AZ series magnesium alloys and mechanism of weld shape and pore formation

Cited by 17 publications

References 20 publications

Electron Beam Welding of TZM Sheets

Electron Beam Welding of TZM Sheets

Critical review on fusion welding of magnesium alloys: metallurgical challenges and opportunities

Mechanism to Reduce the Porosity during Argon Arc Welding of Aluminum Alloys by Changing the Arc Angle

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