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HomeMaterials Science ForumMaterials Science Forum Vol. 970Effects of Electrode Degradation on Properties of...

Effects of Electrode Degradation on Properties of Small-Scale Resistance Spot Welded Joints of E110 Alloy

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Abstract:

Effect of electrode degradation on stability of nugget formation during small-scale resistance spot welding is presented in this paper. Production of spacer grids for nuclear fuel assemblies made of E110 zirconium alloy cells of 0.25 mm thickness was studied. The following degradation processes took place in the electrodes as they wore. Roughness of the tip surface was gradually reduced to the values of the welded cells. The semispherical tips were severely deformed during the initial period of their operation (1.500...2.000 welds). The deformation dynamics slowed down significantly after that. Microhardness on the tip surface of the electrodes decreased. It was minimal in the central part of the surface layer with a thickness of 50...100 μm and increased towards the periphery. Significant coarsening of the electrode metal microstructure occurred at a depth of ~ 1 mm. Nugget area and its tensile strength decreased as the electrodes wore. An increase in welding current did not reduce deterioration of nugget quality. Measurement and processing of dynamic resistance between electrodes did not make it impossible to predict and control the properties of nuggets for the studied welding modes.

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Periodical:

Materials Science Forum (Volume 970)

Pages:

227-235

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.970.227

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Online since:

September 2019

Authors:

Aleksey S. Kiselev, Mikhail S. Slobodyan*

Keywords:

Electrode Degradation, Small-Scale Resistance Spot Welding, Weld Properties, Zirconium Alloys

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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