Effect of Impact Velocity on Interface Characteristics of HT-9 Steel Joints Fabricated by Magnetic Pulse Welding

Song, Jae Woong; Park, Jin Ju; Lee, Gyoung‐Ja; Lee, Minku; Park, Kyu‐Hyun; Hong, Soon‐Jik; Lee, Jung Gu

doi:10.1007/s12540-019-00510-0

Cited by 8 publications

(6 citation statements)

References 35 publications

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“…It is therefore quite difficult, or even impossible, to identify the exact length of the joint for MPW of tubes and sheets and the difficulty is exacerbated further due to the microscopic wavy nature of the joint interface [10,14]. A simpler approach is adopted here to estimate the joint length as a function of the flyer impact angle (α) and impact velocity (v i ), and the target material density (ρ t ) and its flexural rigidity (EI) [55][56][57]. Table 4 presents these five variables and their dimensions in the MLT system for the dimensional analysis.…”

Section: Formulation For the Joint Lengthmentioning

confidence: 99%

“…The derivation of the π-terms is presented in Appendix D. The variable π 13 embodies the welded length in a dimensionless form for a flyer impact velocity, and the material density and flexural rigidity of a target. A higher value of the initial impact angle is likely to result in greater impact velocity and higher welded segment [5,10,55,56]. Thus, a direct relation between the π 13 and π 14 is conceived as follows:…”

Section: Variable Symbol Dimensionmentioning

confidence: 99%

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Analytical Estimation of Electromagnetic Pressure, Flyer Impact Velocity, and Welded Joint Length in Magnetic Pulse Welding

Shotri

Faes

Racineux

et al. 2022

Metals

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Magnetic pulse welding involves the joining of two metallic parts in a solid state by the use of a short and intense electromagnetic impulses and the resulting impact between the parts. The coalesced interface undergoes visco-plastic deformation at a high strain rate and exhibits a wavy shape at a microscopic scale. A practical estimation of the electromagnetic pressure, impact velocity and welded joint length as a function of the process conditions and the electromagnetic coil geometry is required but currently not available. Three novel analytical relations for the estimation of the electromagnetic pressure, impact velocity, and welded joint length for magnetic pulse welding of tubes and sheets, are presented. These relations were developed systematically, following a dimensional analysis, and validated for a wide range of conditions from independent literature. The comparison of the analytically computed results and the corresponding values reported in the literature has illustrated that the proposed analytical relations can be used for the estimation of the electromagnetic pressure and impact velocity for the magnetic pulse welding of tubes and sheets with a good level of confidence. The analytically calculated results for the welded joint length show a little discrepancy with the corresponding experimentally measured values. Further investigations and more experimentally measured results are required to arrive at a more comprehensive analytical relation for the prediction of welded joint length.

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Section: Formulation For the Joint Lengthmentioning

confidence: 99%

Section: Variable Symbol Dimensionmentioning

confidence: 99%

Analytical Estimation of Electromagnetic Pressure, Flyer Impact Velocity, and Welded Joint Length in Magnetic Pulse Welding

Shotri

Faes

Racineux

et al. 2022

Metals

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show abstract

“…The main tool for generating magnetic fields is a single-or multi-turn coil or inductor, often with field-shapers (FS). The highest requirements to the field pulse are imposed by the process of magnetic pulse welding (MPW), especially for high-strength, hard-to-weld steels, e.g., ferritic-martensitic steels for nuclear industry [3][4][5], where a field of 40-50 T is generated in the inductor at 10-20 µs half-period. The energy of the magnetic field is transferred to the kinetic energy of the metal workpiece, which leads to the collision of the welding parts at speeds of 300-500 m/s, and forming metallurgical bonds.…”

Section: Introductionmentioning

confidence: 99%

Development of Multi-part Field-Shapers for Magnetic-Pulse Welding Using Nanostructured Cu-Nb Composite

Zaytsev,

Krutikov,

Spirin

et al. 2024

Preprint

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Magnetic pulse welding (MPW) employs high pulsed magnetic field to accelerate parts against each other thus forming an impact joining. Single-turn tool coils and field-shapers (FS) used in MPW operate under the most demanding conditions: a magnetic field of 40-50 T with a period of tens of microseconds. For conventional copper and bronze coils intense thermo-mechanical stresses lead to rapid degradation of the working bore. This work is aimed to improve the efficiency of field-shapers and focused on development of 2- and 4-slit FS with nanocomposite Cu 18Nb wire brazed as FS inner current-carrying layer. The measured ratio of magnetic field to discharge current was 56.3 and 50.6 T/MA for 2- and 4-slit FS respectively. FEM calculations of magnetic field generation showed its 6-9% and 3% variation for 2- and 4-slit FS respectively. The results of copper tube compression have shown an ovality of 27% and 7% for 2- and 4-slit FS respectively. The measured deviation of weld joining length was 11% and 1.4% in 2- and 4-slit FS respectively. Compared to the previous experiments on the whole steel inductor, the novel FS showed significantly better results in terms of efficiency and homogeneity of the magnetic field.

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“…The main tools for generating magnetic fields are single-or multi-turn coils or inductors, which often have field-shapers (FSs). The highest field pulse requirements are imposed by the process of magnetic pulse welding (MPW), especially for high-strength, hard-to-weld steels, e.g., ferritic-martensitic steels for use in the nuclear industry [3][4][5], in which a field of 40-50 T is generated in the inductor for a 10-20 µs half-period. The energy of the magnetic field is transferred to the kinetic energy of the metal workpiece, which leads to the collision of the parts to be welded at speeds of 300-500 m/s, forming metallurgical bonds.…”

Section: Introductionmentioning

confidence: 99%

Development of Multi-Part Field-Shapers for Magnetic Pulse Welding Using Nanostructured Cu-Nb Composite

Zaytsev,

Krutikov,

Spirin

et al. 2024

JMMP

View full text Add to dashboard Cite

Magnetic pulse welding (MPW) employs a strong pulsed magnetic field to accelerate parts against each other, thus forming an impact joint. Single-turn tool coils and field-shapers (FSs) used in MPW operate under the most demanding conditions, such as magnetic fields of 40–50 T with periods lasting tens of microseconds. With the use of conventional copper and bronze coils, intense thermo-mechanical stresses lead to the rapid degradation of the working bore. This work aimed to improve the efficiency of field-shapers and focused on the development of two- and four-slit FSs with a nanocomposite Cu 18Nb brazed wire acting as an inner current-carrying layer. The measured ratios of the magnetic field to the discharge current were 56.3 and 50.6 T/MA for the two- and four-slit FSs, respectively. FEM calculations of the magnetic field generated showed variations of 6–9% and 3% for the two- and four-slit FSs, respectively. The ovality percentages following copper tube compression were 27% and 7% for the two- and four-slit FSs, respectively. The measured deviations in the weld-joining length were 11% and 1.4% in the two- and four-slit FSs, respectively. Compared to the previous experiments on an entirely steel inductor, the novel FS showed significantly better results in terms of its efficiency and the homogeneity of its magnetic field.

show abstract

Effect of Impact Velocity on Interface Characteristics of HT-9 Steel Joints Fabricated by Magnetic Pulse Welding

Cited by 8 publications

References 35 publications

Analytical Estimation of Electromagnetic Pressure, Flyer Impact Velocity, and Welded Joint Length in Magnetic Pulse Welding

Analytical Estimation of Electromagnetic Pressure, Flyer Impact Velocity, and Welded Joint Length in Magnetic Pulse Welding

Development of Multi-part Field-Shapers for Magnetic-Pulse Welding Using Nanostructured Cu-Nb Composite

Development of Multi-Part Field-Shapers for Magnetic Pulse Welding Using Nanostructured Cu-Nb Composite

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