Magnetic pulse welding (MPW), as an environmentally friendly room temperature solid-state welding technology, usually involves low energy utilization efficiency, resulting in the need for higher energy to achieve metallurgical welding. This study proposed an innovative
Since magnetic pulse welding is generally completed in the first half period of the discharge current, there is still a part of the magnetic field energy remaining, which will continue to maintain the coil current and eventually transfer to heat energy, so only a small part of the magnetic energy is transferred to electromagnetic force on the workpiece. By changing the
F ↕ ↓ ¼ J ↕ ↓ B ↕ ↓: (1) 3 Welding setup EMW requires a high voltage power supply, a bank of energy storage capacitors, a triggering system, a coil with
To solve the problem of energy loss caused by low energy utilization rate in the process of magnetic pulse welding (MPW), this paper presents a method to recover the energy after the first half wave of pulse current by using auxiliary capacitance. A detailed introduction of the working process of the improved discharge circuit was first carried out. Then experimental
When the generator has limited disposable energy, O-shape coil is a preferential choice for electromagnetic pulse welding; Quasi-static, dynamic shear tests along with fatigue test results
Overview of Energy Storage Technologies. Léonard Wagner, in Future Energy (Second Edition), 2014. 27.4.3 Electromagnetic Energy Storage 27.4.3.1 Superconducting Magnetic Energy Storage. In a superconducting magnetic energy storage (SMES) system, the energy is stored within a magnet that is capable of releasing megawatts of power within a fraction of a cycle to
By changing the circuit structure to regulate the current waveform, the purpose of reducing the unused magnetic field energy can be achieved, and meantime, the thermal energy of the coil can be reduced, and the service life of the coil can be increased.
In this paper, a highly flexible, miniaturized S-shaped stereoscopic coil was proposed to reduce the working area required for the MPW process. The required working area was reduced to 32 × 30 mm. Numerical simulations were performed to determine the most suitable coil cross-section size.
A numerical method to simulate the high-speed free forming of a clamped circular disk in an electromagnetic forming system using a flat spiral coil is presented. The method combines field
The electromagnetic welding set-up consists of an energy-storage capacitor bank, a high- voltage charging power supply, a discharge circuit, a work coil and, if appropriate, a field shaper.
Magnetic pulse welding (MPW) uses high-frequency, intense electrical energy to produce a transient electromagnetic (EM) field and pressure that cause a rapid impact and solid-state coalescence along the interface between overlapping metallic sheets [1–4].
By changing the circuit structure to regulate the current waveform, the purpose of reducing the unused magnetic field energy can be achieved, and meantime, the thermal
Magnetic pulse welding (MPW) uses high-frequency, intense electrical energy to produce a transient electromagnetic (EM) field and pressure that cause a rapid impact and solid-state coalescence along the interface
Superconducting energy storage systems utilize superconducting magnets to convert electrical energy into electromagnetic energy for storage once charged via the converter from the grid, magnetic fields form
출원번호출원명 출원인출원연도US6977361 Molecular bonding of vehicle frame components using magnetic impulse welding techniquesDana Co. Ltd. 2005US687596 Apparatus for electromagnetic forming, joining and weldingFord Motor Company 2005US6548791 Energy storage apparatus and inductor tools for magnetic pulse welding and formingInli, LLC 국외
(a) Electromagnetic pulse welding installation; (b) tool coil applied for sheet welding. Table 1. Properties of the EN AW-1050 H14 [27] and Cu-DHP R240 sheet [28].
In Electromagnetic Welding (EMW) process, the capacitive energy is the source of input energy. The tool that is used for welding comprises of an electromagnetic coil. The job piece to be welded is
Equipment for magnetic pulse welding consists of the following components: a transformer coil, with which the frequency and amplitude of the electric current discharge can be adjusted. BWI
An innovative integrated I-shape multi-layer coil was designed for the electromagnetic welding (EMW) process using the finite element method (FEM) combined with
To solve the problem of energy loss caused by low energy utilization rate in the process of magnetic pulse welding (MPW), this paper presents a method to recover the
A numerical method to simulate the high-speed free forming of a clamped circular disk in an electromagnetic forming system using a flat spiral coil is presented. The method combines field
Equipment for magnetic pulse welding consists of the following components: a transformer coil, with which the frequency and amplitude of the electric current discharge can be adjusted. BWI has a test setup that allows to investigate the applicability of the process for certain applications.
Magnetic pulse welding (MPW) uses high-frequency, intense electrical energy to produce a transient electromagnetic (EM) field and pressure that cause a rapid impact and solid-state coalescence along the interface between overlapping metallic sheets [1,2,3,4].
Workstation—electromagnetic coil, workpiece, electrical cables, field shaper, and transformer. The transformer increases the voltage level to appropriately charge the capacitor bank. This energy is then discharged into welding coil. In the positive half cycle, the energy is delivered from the capacitor to the inductor, and in the negative
When the generator has limited disposable energy, O-shape coil is a preferential choice for electromagnetic pulse welding; Quasi-static, dynamic shear tests along with fatigue test results on different sheet combinations attest a higher resistance of the spot welds as fracture occurred outside the welds, mostly around the corners of the welded
To solve the problem of energy loss caused by low energy utilization rate in the process of magnetic pulse welding (MPW), this paper presents a method to recover the energy after the first half wave of pulse current by using auxiliary capacitance.
Magnetic pulse welding (MPW), as an environmentally friendly room temperature solid-state welding technology, usually involves low energy utilization efficiency, resulting in the need for higher energy to achieve metallurgical welding. This study proposed an innovative coil structure for increasing energy utilization efficiency
In this paper, a highly flexible, miniaturized S-shaped stereoscopic coil was proposed to reduce the working area required for the MPW process. The required working
Magnetic pulse welding (MPW) uses high-frequency, intense electrical energy to produce a transient electromagnetic (EM) field and pressure that cause a rapid impact and solid-state
An innovative integrated I-shape multi-layer coil was designed for the electromagnetic welding (EMW) process using the finite element method (FEM) combined with response surface methodology (RSM) to minimize the required discharge energy of welding.
Numerical simulation results showed that the peak pulse current is amplified with the 7-turn coil and the error is 1.40 %. The new coil requires less energy to realize magnetic pulse welding of dissimilar sheets.
Equipment for magnetic pulse welding consists of the following components: a transformer coil, with which the frequency and amplitude of the electric current discharge can be adjusted. BWI has a test setup that allows to investigate the applicability of the process for certain applications.
As a general rule, thicker and materials with higher mechanical characteristics require superior discharge energies capable of providing higher impact velocities. When the generator has limited disposable energy, O-shape coil is a preferential choice for electromagnetic pulse welding;
The maximum energy of the welding machine is 50 kJ with a charging voltage of 25 kV. The following figure shows the coil in conjunction with the field shaper. The weld is stronger than the weakest base material : during material testing the crack appears outside the weld area.
Therefore, in order to reduce the discharge energy (i.e., discharge voltage) while ensuring the peak pulse current, improve the energy utilization rate of the coil, broaden the versatility of the equipment, and facilitate the MPW between aluminum alloy plate and high-strength steel plate, an innovative coil is proposed in this paper.
A condition for magnetic pulse welding is that the material to be deformed needs to possess a good electrical conductivity. If this is not the case, the required energy to deform or weld the material increases. Another condition is that the surfaces to be joined need to be positioned in the overlap configuration.
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