When a narrow gap was formed under appropriate welding conditions in the steel pipe manufacturing process using highfrequency resistance welding, temperature distribution was analyzed to predict the length of the gap. Assuming the length of the gap from the apex point to the welding point at an applied voltage, and calculating the temperature distribution around the gap, the length of the gap with an appropriate fusion width at the welding point could be estimated. Along with this, the current density and magnetic flux density distributions that appeared in the narrow gap were obtained according to the change in the applied voltage, and the distribution shape and size of the electromagnetic force acting on the gap were also predicted. The current density, magnetic flux density, and electromagnetic force gradually increased along the narrow gap, showing the maximum value at the welding point. In the temperature distribution in the narrow gap, the surface of the front end began to melt at an appropriate applied voltage, and the melting width was the largest at the welding point. As the applied voltage increased, the narrow gap became longer, and the appropriate gap length appeared in proportion to the applied voltage.
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Analysis of Stress Distribution around the Weld Zone in High Frequency Resistance Welding of Steel Pipe Young-Soo Yang, Kang-Yul Bae Journal of the Korean Society of Manufacturing Process Engineers.2024; 23(6): 21. CrossRef
The high-frequency electric resistance welding (HF-ERW) process is widely used in the steel pipes production because it can weld at a high speed, has excellent weldability, and attains clean and precise shapes. However, for process improvement, analytic studies on electromagnetic field and temperature distributions, and selection of appropriate process variables are required. In this study, finite element analysis models that can analyze the electromagnetic field distribution and temperature distribution in the HF-ERW of a steel pipe were proposed, in consideration of the characteristics of the process, including electromagnetic phenomena localized to the workpiece surface and fast welding speed. By applying the proposed analysis models, changes in current density, magnetic flux density, generated heat density, and fused width in the pipe could be predicted according to changes in process variables such as the V angle of the strip, the electrode position, and the source voltage. Through comparison with the analysis and the limited-case experiment, the analysis result predicted the actual fused width fairly well, and the validity of the proposed model could be verified.
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Characterization of an electric resistance welded steel plate K. K. Patel, R. Nagar, D. Chauhan Practical Metallography.2025; 62(5): 331. CrossRef
Analysis of Stress Distribution around the Weld Zone in High Frequency Resistance Welding of Steel Pipe Young-Soo Yang, Kang-Yul Bae Journal of the Korean Society of Manufacturing Process Engineers.2024; 23(6): 21. CrossRef
Analysis of Electromagnetic Field and Temperature Distribution around Narrow Gap in High-frequency Resistance Welding of Steel Pipe Young Soo Yang, Kang Yul Bae Journal of the Korean Society for Precision Engineering.2023; 40(10): 829. CrossRef
The purpose of this study is to propose a better contact surface pattern of a heat radiating block in a progressive GMP (Glass Molding Process) heating assembly. In this study, a simulation model based on FEM was developed to perform a thermal analysis for the heating assembly. It was verified by comparing experimental results. The temperature distribution on the heating block surface and heating energy consumption was analyzed with the change of contact surface pattern and area of a heat radiating block. The considered pattern on the contact surface was cross (+) and straight (-) shape. The contact area ratio was changed from 16 to 100%. The simulation results show that the heating energy consumption increased to reach a target temperature with the increase of contact area ratio. The straight-shaped patterns on a heat radiating block presented more uniform temperature distribution on the mold heating surface than the cross shaped surface, whereas it resulted in a slightly higher energy consumption of up to 9%. This study shows that the contact surface pattern on a heat dissipating block can control the temperature distribution on the mold heating surface.
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A Study on Temperature and Stress Distribution in a Lens under Multi-Stage Cooling Conditions in Progressive Glass Molding Processes Ji Hyun Hong, Jeong Taek Hong, Dong Yean Jung, Young Bok Kim, Keun Park, Chang Yong Park Journal of the Korean Society for Precision Engineering.2025; 42(2): 157. CrossRef
A Study on Numerical Analysis for Determination of Glass Molding Process Conditions for Glass Lenses Jaehun Choi, Sajan Tamang, Heesung Park Journal of the Korean Society for Precision Engineering.2024; 41(3): 207. CrossRef
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