Beam deflection effects on the microstructure and defect creation on electron beam welding of molybdenum to Kovar

Yin, Qianxing; Zhang, Binggang; Feng, Jicai

doi:10.1016/j.jmatprotec.2018.12.017

Cited by 27 publications

(3 citation statements)

References 15 publications

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“…Cracks were confirmed as solidification cracks and low plastic embrittlement cracks. In addition, Chen et al (2019) [23] found that during welding with a 0.6 mm beam deflection to Kovar, the weld zone exhibits equiaxed crystals. Compared with the columnar crystal during In addition, Chen et al (2019) [23] found that during welding with a 0.6 mm beam deflection to Kovar, the weld zone exhibits equiaxed crystals.…”

Section: Ebwmentioning

confidence: 99%

“…In addition, Chen et al (2019) [23] found that during welding with a 0.6 mm beam deflection to Kovar, the weld zone exhibits equiaxed crystals. Compared with the columnar crystal during In addition, Chen et al (2019) [23] found that during welding with a 0.6 mm beam deflection to Kovar, the weld zone exhibits equiaxed crystals. Compared with the columnar crystal during welding without beam deflection, the microstructure of the weld zone transforms into an equiaxed crystal when welding with a 0.6 mm beam offset to Kovar.…”

Section: Ebwmentioning

confidence: 99%

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Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys

Zhu¹,

Xie

Shang

et al. 2020

Metals

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Owing to its potential application prospect in novel accident tolerant fuel, molybdenum alloys and their welding technologies have gained great importance in recent years. The challenges of welding molybdenum alloys come from two aspects: one is related to its powder metallurgy manufacturing process, and the other is its inherent characteristics of refractory metal. The welding of powder metallurgy materials has been associated with issues such as porosity, contamination, and inclusions, at levels which tend to degrade the service performances of a welded joint. Refractory metals usually present poor weldability due to embrittlement of the fusion zone as a result of impurities segregation and the grain coarsening in the heat-affected zone. A critical review of the current state of the art of welding Mo alloys components is presented. The advantages and disadvantages of the various methods, i.e., electron-beam welding (EBW), tungsten-arc inert gas (TIG) welding, laser welding (LW), electric resistance welding (ERW), and brazing and friction welding (FW) in joining Mo and Mo alloys, are discussed with a view to imagine future directions. This review suggests that more attention should be paid to high energy density laser welding and the mechanism and technology of welding Mo alloys under hyperbaric environment.

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Section: Ebwmentioning

confidence: 99%

Section: Ebwmentioning

confidence: 99%

Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys

Zhu¹,

Xie

Shang

et al. 2020

Metals

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show abstract

“…The beam current and joining speed can be controlled, which can effectively shorten the metallurgical reaction time and control the metallurgical reaction process. For these reasons, EBB is superior in joining refractory metal and steel [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Electron beam brazing of AISI 304 and copper dissimilar materials

Hodúlová

Sahul

et al. 2021

Weld World

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The aim of the paper is focusing on the brazeability of stainless steel AISI 304 and copper Cu-ETP (electrolytically tough pitch) dissimilar materials by electron beam. The thickness of base materials was 1 mm. Cusil eutectic brazing alloy (72Ag-28Cu, AWSBAg-8) in the form of thin foil was used as filler material. Overlapped joints were manufactured using defocused vertical electron beam. The effect of beam current on braze appearance, microstructure, and microhardness of brazed joints was investigated. The scanning electron microscopy indicated the possibility of obtaining defect-free joints. The results show that the binary Ag-Fe equilibrium diagram is expectedly the microstructure even at the moderate cooling and solidification rates expected under the used electron beam brazing conditions and parameters. Beam current is the main brazing parameter influencing the joint quality. Optimum brazing parameters were as follows: beam current 6 mA, brazing speed of 5 mm/s, and 50 passes at constant accelerating voltage (U = 55 kV), focusing current (I f = 990 mA) across the upper material length-Cu.

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