Studies on the micro-laser spot welding of an NdFeB permanent magnet with a low carbon steel

Chang, Baohua; Bai, Shi; Du, Dong; Zhang, Hua; Zhou, Yangping

doi:10.1016/j.jmatprotec.2010.01.021

Cited by 15 publications

(10 citation statements)

References 4 publications

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“…However, studies carried out so far on the laser welding of sintered NdFeB magnet are still very limited. Microstructures and mechanical behavior have been studied for laser welds of NdFeB magnets [21] and laser welds of dissimilar materials of a NdFeB magnet and mild steel [22]. Nevertheless, it is still not clear how the laser welding will affect the magnetic property and how the optimal magnetic performance can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Influences of Laser Spot Welding on Magnetic Property of a Sintered NdFeB Magnet

Chang

et al. 2016

Metals

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Laser welding has been considered as a promising method to join sintered NdFeB permanent magnets thanks to its high precision and productivity. However, the influences of laser welding on the magnetic property of NdFeB are still not clear. In the present paper, the effects of laser power on the remanence (Br) were experimentally investigated in laser spot welding of a NdFeB magnet (N48H). Results show that the Br decreased with the increase of laser power. For the same welding parameters, the Br of magnets, that were magnetized before welding, were much lower than that of magnets that were magnetized after welding. The decrease in Br of magnets after laser welding resulted from the changes in microstructures and, in turn, the deterioration of magnetic properties in the nugget and the heat affected zone (HAZ) in a laser weld. It is recommended that the dimensions of nuggets and HAZ in laser welds of a NdFeB permanent magnet should be as small as possible, and the magnets should be welded before being magnetized in order to achieve a better magnetic performance in practical engineering applications.

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Section: Introductionmentioning

confidence: 99%

Influences of Laser Spot Welding on Magnetic Property of a Sintered NdFeB Magnet

Chang

et al. 2016

Metals

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“…6h), characteristic of conduction mode. 12 However, when the laser power was equal to or more than 1500 W, the fusion zones exhibited hourglass shapes (Fig. 6b, d and f), characteristic of keyhole welding.…”

Section: Macrostructurementioning

confidence: 96%

“…2,3,11 The majority of previous studies concerning laser spot welding has focused on the welding of tiny components with use of high frequency and low power pulsed laser equipment. 5,12 The spot welding of automobile steels still mainly depends on the resistance spot welding method. [13][14][15] There are limited literatures concerning the laser spot welding of automobile steels.…”

Section: Introductionmentioning

confidence: 99%

Study on fibre laser spot welding of TRIP980 steel

Wei

Liu

et al. 2015

Materials Science and Technology

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A 980 MPa transformation induced plasticity (TRIP) steel was fibre laser spot welded by different Argon (Ar) shielding conditions, laser power (1000 up to 2500 W) and defocusing distances (28 up to z8 mm). The surface appearance, cross-section macrostructure, microstructure, hardness, tensile shear properties and fatigue properties of laser spot welds were evaluated. The results showed that the welds with Ar shielding had larger weld appearance and bonding sizes, better tensile shear properties compared with the welds without Ar shielding. With the increase in laser power, the laser welding mode changed from conduction to keyhole, which improved the bonding size and mechanical properties. The bonding size and mechanical properties increased in the order of defocusing distances of z8, 28, z4, 24 and 0 mm. During the fatigue tests of laser spot weld, the fusion zone pullout and sheet transverse fracture failure modes were observed.

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Section: Introductionmentioning

confidence: 99%

“…Due to the brittleness of rare earth permanent magnets, handling and mounting are challenging [10]. Permanent magnets are typically mounted by adhesives, such as epoxy resins, and rarely by mechanical interlocking into diverse magnetic sensor devices [10][11][12][13]. The strength and durability of adhesive bonds are relatively low compared to other joining methods and, most importantly, the mechanical properties of the joints change during the lifetime of the device because of the viscosity of polymers [10,14,15].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Welding of Magnetic Hybrid Material Systems – 316L Stainless Steel to Ni/Cu/Ni-Coated Nd2Fe14B Magnets

Liesegang

Beck

2020

Preprint

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The performance of electric sensors is continuously improving due to the demands of modern vehicles and electronic devices. Magnetic sensors are used in a wide field of applications. However, handling and mounting the typical high-performance rare earth permanent magnets are challenging due to their brittleness. A constant magnetic flux is a key property of the magnetic setup in many devices. State-of-the-art adhesive bonding of magnets in devices can cause problems due to the low durability and viscous behaviour of adhesive polymers, as the magnet may change its position and hence, the magnetic flux distribution in the magnetic setup changes.Ultrasonic welding is a powerful technique to join hybrid material systems quickly and reliably, providing high joint strength, even for brittle materials such as glasses, ceramics and rare earth permanent magnets. The latter is being investigated in this work for the first time. The ultrasonic welding process was adapted to join 316L stainless steel, representing potential components of magnetic devices, to Ni/Cu/Ni-coated Nd2Fe14B. In addition to directly joined steel/magnet-hybrids, ductile aluminium and nickel interlayers were used in order to enhance the joint strength. Process parameters were developed and evaluated considering the resulting shear strength of the joints. The highest shear strength of 35 MPa was achieved for 316L/Nd2Fe14B and 316L/Al/Nd2Fe14B, which is more than twice the shear strength of adhesively bonded joints of up to 20 MPa, according to the literature. The functional performance of the hybrid material systems, evaluated by the magnetic flux density of the hybrid material systems was the highest for directly bonded joints, and those with a nickel interlayer, which did not show any losses in comparison to the single magnet in its initial state. Joints with an aluminium interlayer showed losses of 3% and adhesively bonded joints showed losses of 7% of the magnetic flux density.In summary, the results of this work indicate that ultrasonic welding is a suitable technique to improve the production process and performance of magnetic devices.

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Studies on the micro-laser spot welding of an NdFeB permanent magnet with a low carbon steel

Cited by 15 publications

References 4 publications

Influences of Laser Spot Welding on Magnetic Property of a Sintered NdFeB Magnet

Influences of Laser Spot Welding on Magnetic Property of a Sintered NdFeB Magnet

Study on fibre laser spot welding of TRIP980 steel

Ultrasonic Welding of Magnetic Hybrid Material Systems – 316L Stainless Steel to Ni/Cu/Ni-Coated Nd2Fe14B Magnets

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