Mechanical fastening and joining technologies to using multi mixed materials of car body

Kim, Yong; Park, Kiyoung; Kwak, Sungbok

doi:10.5781/jwj.2015.33.3.12

Cited by 18 publications

(4 citation statements)

References 2 publications

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“…These trends indicate that the welding, joining, and fastening technologies of various materials will be of paramount importance in the future, and securing these technologies will likely ensure product competitiveness. 2 Consequently, attempts have been made to use numerous existing welding processes to weld multi-materials and mixed components. Due to the dissimilar properties of the multi-materials during welding, however, heat-based fusion welding processes typically result in defects such as solidification, cracking, porosity, oxidation, and transformation.…”

Section: Introductionmentioning

confidence: 99%

Selection of design parameters of working coil for Al/Cu tubular Magnetic Pulse Welding

Shim,

Kim

2023

Advances in Mechanical Engineering

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MPW produces a high Lorentz force for welding through the interaction of magnetic fields between the working coil and outer workpiece. Therefore, the design of the working coil is crucial in the MPW process. In particular, it is important to understand and estimate the distribution of Lorentz force on the outer tube and the stress on the working coil. These factors greatly impact the efficiency of energy delivery and the durability of the process. The purpose of this research was to analyze the effect of coil design parameters on the Lorentz force and stress. The ultimate objective was to optimize these design parameters specifically for welding tubular workpieces; for this, an electromagnetic-mechanical FE-model was developed. The design parameters considered in this study included the angle, radius, and protruding length. The Lorentz force and stress were calculated based on these parameters. Notably, the response surface method (RSM) and sequential quadratic programing (SQP) were utilized to develop a prediction model and optimize the design parameters, respectively. The findings revealed that the protruding length and angle are significant design parameters. Consequently, a working coil was manufactured using the optimized design parameters, leading to a successful Al/Cu joint. These results emphasize the indispensability of optimizing design parameters to achieve high-quality joints.

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Section: Introductionmentioning

confidence: 99%

Selection of design parameters of working coil for Al/Cu tubular Magnetic Pulse Welding

Shim,

Kim

2023

Advances in Mechanical Engineering

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“…Subsequently, more and more manufacturer used clinching technology to join body sheet materials. Recently, clinching technology was widely employed to join parts of the car body [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Joining thin-walled structures without protuberance by two-strokes flattening clinching process

Peng

Chen

et al. 2021

Int J Adv Manuf Technol

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Clinching technologies have better performance in joining different sheet materials. However, the protuberance and mechanical behaviors of clinched joints have always been needed to be improved. In this paper, a new clinching method, named two-strokes attening clinching (TFC) process, was proposed to improve the mechanical behaviors of joints and atten the protuberance. Mechanical testing including tension shearing tests were employed under quasi-static conditions to evaluate the different mechanical behaviors between TFC and conventional clinched joints. The in uences of the different forming forces on mechanical response of these joints were studied. The static strength, energy absorption, material ow and failure modes of TFC and conventional clinched joints were investigated comparatively. The experimental results demonstrated that the tension-shear strength of TFC clinched joints was increased by 30.3% compared with conventional clinched joints at the forming force of 30 kN. Furthermore, the material ow analysis showed that the thickness and interlock of TFC clinched joints were increased by 79% and 45.9%, respectively. The energy absorption of TFC clinched joint was increased by 82%. In addition, the TFC process did not change the failure mode of clinched joints, and the failure mode of all clinched joints was neck fracture.

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“…종소재 접합 연구가 활발히 진행되고 있다 4,5) . SPR은 성형기반의 체결방법으로 사전 홀 가공 없이 punch를 사용하여 강한 압력을 rivet에 가하여 리벳 과 접합재의 소성변형으로 접합이 이루어지며, 접착제 와의 혼용이 가능하여 우수한 접합강도를 확보할 수 있 다 6) . 그러나, 1.5 GPa 강재의 SPR 적용을 위해서는 고강도화로 인한 낮은 연신율과 높은 항복강도 및 인장 강도 등의 기계적 특성을 극복하기 위한 시스템의 가압 력의 증가가 필수적으로 요구된다 7) .…”

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Investigation of Joint Quality 980 MPa Grade GA Steel Sheet and 5052 Aluminum Alloy by Electromagnetic Self-Piercing Riveting

Kim¹,

Park²,

Shim³

2023

J Weld Join

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Generally, an approximately 1% weight reduction in a 200 kg automobile improves the fuel economy by 20~26% and acceleration performance by 8%. Hence, various techniques for automotive lightweighting have been developed to satisfy environmental regulations of the automotive industry. The joining of dissimilar materials is critical for assembling lightweight body structures, but fusion welding is inapplicable owing to the difference in mechanical properties between materials. Thus, the development of an appropriate dissimilar material-joining process is required to produce high-quality joints. Self-piercing riveting is a representative joining process that is applied by pressure punching without prehole piercing. Operationally, this process is widely used for joining because it can produce joints with high shear strengths. However, the development of lighter and higher-strength materials indicates that the required force for SPR machines to form high-quality joints is increasing. Thus, high-speed E-SPR has been developed for joining ultrahigh tensile steels. In this study, SGAFC980/A5052-H34 was applied to the E-SPR process, and the joint characteristics were analyzed via cross-sectional analysis and shear strength tests. With an increase in the fastening speed, the interlock distance and the tensile shear load increased.

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Mechanical fastening and joining technologies to using multi mixed materials of car body

Cited by 18 publications

References 2 publications

Selection of design parameters of working coil for Al/Cu tubular Magnetic Pulse Welding

Selection of design parameters of working coil for Al/Cu tubular Magnetic Pulse Welding

Joining thin-walled structures without protuberance by two-strokes flattening clinching process

Investigation of Joint Quality 980 MPa Grade GA Steel Sheet and 5052 Aluminum Alloy by Electromagnetic Self-Piercing Riveting

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