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  1. No Access

    Article

    Bimetallic additively manufactured structure (BAMS) of Inconel 625 and austenitic stainless steel: effect of heat-treatment on microstructure and mechanical properties

    This study presents a bimetallic additively manufactured structure (BAMS) of Inconel 625 (In625) and austenitic stainless steel 316L (SS316L) manufactured by a gas-metal-arc-welding (GMAW) based on wire-arc ad...

    You Sub Kim, Daeho Yun, Jun Hyun Han… in The International Journal of Advanced Manu… (2022)

  2. No Access

    Article

    Factors affecting shrinkage voids in advanced high strength steel (AHSS) resistance spot welds

    Among various defects formed in resistance spot welds of advanced high strength steels (AHSS), shrinkage voids are seldomly studied. Apparently, the voids are thought to be formed towards the end of solidifica...

    Vijeesh Vijayan, Siva Prasad Murugan… in Journal of Mechanical Science and Technolo… (2021)

  3. No Access

    Article

    Robot-assisted non-destructive testing of automotive resistance spot welds

    A commercially available matrix phased array (MPA) ultrasonic imaging system was successfully integrated into a robot-assisted automated non-destructive testing (NDT) method for resistance spot weld applicatio...

    Changwook Ji, Jeong K. Na, Yoon-Seok Lee, Yeong-Do Park… in Welding in the World (2021)

  4. No Access

    Article

    Liquid zinc penetration induced intergranular brittle cracking in resistance spot welding of galvannealed advanced high strength steel

    This study aims to explore the mode of Zn transportation and the failure mechanism of cracking associated with liquid metal embrittlement (LME) using fractography as the key technique. A three-point bend test ...

    Siva Prasad Murugan, Jong Bae Jeon, Changwook Ji, Yeong-Do Park in Welding in the World (2020)

  5. No Access

    Article

    Heat treatment effects on Inconel 625 components fabricated by wire + arc additively manufacturing (WAAM)—part 2: mechanical properties

    This study investigates the mechanical properties of the wire + arc additively manufactured Inconel 625 thin wall. The first part of this study focused on the microstructural features of the material after tim...

    A. N. M. Tanvir, MD R. U. Ahsan, Gijeong Seo… in The International Journal of Advanced Manu… (2020)

  6. No Access

    Article

    Critical design parameters of the electrode for liquid metal embrittlement cracking in resistance spot welding

    The present work studied the influence of the geometric design of the electrode on Zn-assisted liquid metal embrittlement (LME) cracking during resistance spot welding (RSW). LME cracking of the galvannealed t...

    Siva Prasad Murugan, Kaisar Mahmud, Changwook Ji, Ilguk Jo… in Welding in the World (2019)

  7. No Access

    Article

    Heat treatment effects on Inconel 625 components fabricated by wire + arc additive manufacturing (WAAM)—part 1: microstructural characterization

    Wire + arc additive manufacturing (WAAM) is a versatile, low-cost, energy-efficient technology used in metal additive manufacturing. This WAAM process uses arc welding to melt a wire and form a three-dimension...

    A. N. M. Tanvir, Md. R. U. Ahsan… in The International Journal of Advanced Manu… (2019)

  8. No Access

    Article

    Optimization of pulsed current in resistance spot welding of Zn-coated hot-stamped boron steels

    Metallic coatings have been widely used for hot-stamped boron steel in automotive applications. Surface coating in hot-stamped boron steels has improved corrosion resistance. However, a thick coating layer deg...

    Joo Yong Cheon, Vijeesh Vijayan… in Journal of Mechanical Science and Technolo… (2019)

  9. No Access

    Article

    Effects of welding current and torch position parameters on bead geometry in cold metal transfer welding

    This study investigated the effects of welding current and torch position parameters, including torch-aiming position, travel angle, and work angle, on bead geometry in single-lap joint gas metal arc (GMA) wel...

    Huijun Lee, Changwook Ji, Jiyoung Yu in Journal of Mechanical Science and Technology (2018)

  10. No Access

    Article

    Electrochemical behavior of CIGS electrodeposition for applications to photovoltaic cells

    The electrodeposition mechanism of Cu(In,Ga)Se2 (CIGS) thin films on ITO substrates was examined by using cyclic voltammetry (CV). The CV study was performed in unitary In, binary In-Se, ternary Cu-In-Se, and qua...

    Hyunju Lee, Changwook Ji, Yangdo Kim, Jae-Ho Lee… in Journal of the Korean Physical Society (2014)

  11. No Access

    Article

    Fabrication of CIGS Films by Electrodeposition Method for Photovoltaic Cells

    Cu(InGa)Se2 (CIGS) thin films were fabricated by electrochemical deposition in a single bath containing Cu, In, Ga, and Se ions. The electrolyte was prepared by dissolving CuCl2, InCl3, GaCl3, H2SeO3, and LiCl in...

    Hyunju Lee, Hyukjoo Yoon, Changwook Ji, Dongyun Lee… in Journal of Electronic Materials (2012)