Hui-Jun Yi

In-situ remanufacturing of forging dies for automobile parts based on wire arc directed energy deposition

Chang Jong Kim, Chan Kyu Kim, Hui-Jun Yi, Seok Kim et autres

kr (code pays fourni par la source)

Improving Mechanical Properties of Wire Arc Additively Manufactured Ti-6Al-4V Alloy by Ultrasonic Needle Peening Treatment

Hui-Jun Yi, Jinwoo Kim, Young-Lak Kim, S. Shin

Wire arc additive manufacturing (WAAM) is being considered as a technology to replace the conventional manufacturing process of titanium alloys. However, coarse β grains, which can extend through several deposited materials, result in strong textures and anisotropy. As a solution, we study …

Effects of Cooling Rate on the Microstructure and Tensile Properties of Wire-Arc Additive Manufactured Ti–6Al–4V Alloy

Hui-Jun Yi, Jinwoo Kim, Young-Lak Kim, S. Shin

kr (code pays fourni par la source)

Characteristics of GMAW Narrow Gap Welding on the Armor Steel of Combat Vehicles

Jae-Seong Kim, Hui-Jun Yi

The primary purpose of this investigation was to study the characteristics of the armor steel weldment of combat vehicles by using GMAW narrow gap welding (NGW). The results showed that the mechanical properties and residual stress distribution of NGW weldment were improved, …

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The Effect of Interpass Peening on Mechanical Properties in Additive Manufacturing of Ti-6Al-4V

Jae-Gyu Byun, Hui-Jun Yi, Sang-Myung Cho

Ti-alloys have high specific strength and are widely used for the filed of space aeronautics plant. However, it is difficult to process Ti-Alloys due to its high yield strength and it cannot raise the machining speed because it has a possibility of …

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Numerical Analysis of Welding Residual Stress Relaxation in High-Strength Multilayer Weldment Under Fatigue Loads

Hui-Jun Yi, Yong-Jun Lee

Abstract The primary purpose of this investigation was to study welding residual stress relaxation by repeated loading. A coupling finite element analysis model for prediction of the welding residual stress and the mechanical stress relaxation after external repeated loads was presented. The …

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Ti-6Al-4V의 AM에서 기계적 성질에 미치는 Interpass Peening의 영향

Jae Gyu Byun, Hui-Jun Yi, Cho Sang Myung

TIG Dressing Effects on Weld Pores and Pore Cracking of Titanium Weldments

Hui-Jun Yi, Yong-Jun Lee, Kwang-O Lee

Weld pores redistribution, the effectiveness of using tungsten inert gas (TIG) dressing to remove weld pores, and changes in the mechanical properties due to the TIG dressing of Ti-3Al-2.5V weldments were studied. Moreover, weld cracks due to pores were investigated. The results …

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STUD Welding on High Hardness Armor Steel of KWV

Hwan-Hwi Cho, Yong-cheol Shin, Hui-Jun Yi

GMAW and GTAW processes have been used for welding of equipment mounting pads during decades. For improving the mobility and survivability of KWV(Korean Wheeled Vehicle), various types of equipment are required and numbers of pads for welding were increased. In this research, …

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Influences of the Welding Heat Input and the Repeated Repair Welding on Ti–3Al–2.5V Titanium Alloy

Hui-Jun Yi, Yong-Jun Lee, Kwang-O Lee

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Effect of nonmetallic inclusions on cold crack susceptibility of armor casting steel weld metal

Soon-Cheol Park, Yong-Jun Lee, Hui-Jun Yi, Geum-Bin Yu et autres

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Investigations on welding residual stress and distortion in a cylinder assembly by means of a 3D finite element method and experiments

Hui-Jun Yi, Jong‐Yun Kim, Jin-Ho Yoon, Sung-Soo Kang

kr (code pays fourni par la source)