Amirhossein Sadeghian- PhD
- Research Fellow at Coventry University
Amirhossein Sadeghian
- PhD
- Research Fellow at Coventry University
Laser Materials Processing
About
11
Publications
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Introduction
Researcher in Laser Materials Processing
Current institution
Education
September 2020 - September 2024
September 2015 - February 2018
Publications
Publications (11)
An effort was made to assess the applicability of using transient liquid phase bonding technique to join a nickel-based precipitation-hardened superalloy (Inconel 939) to a solid-solution-hardened one (Inconel 625) to avoid the limitations of other joining techniques such as fusion welding. Microstructural development and phase formation mechanism...
The microstructure and mechanical properties of transient liquid phase (TLP) bonded joints between dissimilar precipitation hardened IN939 and solid solution hardened IN625 with a Ni-Cr-Si-Fe-B filler alloy were studied. The TLP bonding was conducted in different bonding times (i.e., 15, 25, 35, 45, 60, and 90 minutes). Different phases, formed in...
The electric vehicle (EV) battery systems are complex assemblies of dissimilar materials in which battery cells are connected using several thousand interconnect joints. Every single joint influences the functionality and efficiency of the whole battery system, making the joining process crucial. Laser welding is considered a desirable choice for E...
Modern advancements in blue lasers offer a promising alternative to conventional infrared laser welding of highly-reflective battery materials. In this study, a high-power blue laser system was used to weld the low thickness Ni-coated copper and mild steel used in 18650-type cylindrical cells. The effect of laser power on the penetration depth, int...
Laser beam welding of copper (Cu) using near-infrared radiation is extremely challenging due to its high thermal conductivity and large laser reflectivity. In the present study, the challenges and benefits of using spatial beam oscillation during quasi-continuous wave (QCW) pulsed laser beam welding of 0.4 mm Cu to 1 mm Cu in lap joint configuratio...
The present study reports on the application of blue wavelength (450 nm), continuous wave laser welding of Ni-coated copper to mild steel in lap joint configuration. The laser power was varied from 1 kW to 1.5 kW in incremental steps of 0.1 kW whilst the welding speed was kept constant at 6 m/min. Metallographic examination of the weld samples reve...
In the present paper, continuous Ytterbium Laser Systems (YLS) fiber laser hardening of cylindrical AISI 4340 steel specimens was studied using experimental and statistical analyses. Three laser parameters, namely laser power, laser feed speed, and sample rotation speed were selected to evaluate their influence on the depth of the hardened zone and...
High-strength low alloy (HSLA) S500MC steel is widely used for chassis components, structural parts, and pressure vessels. In this study, the effects of heat input during automatic gas tungsten arc welding (GTAW) on microstructure and mechanical properties of thermomechanically controlled processed (TMP) S500MC steel were investigated. A butt joint...
The applicability of the diffusion brazing technique for joining IN-939 superalloy using a Ni-Cr-B interlayer was assessed. The phases formed during the brazing process in the isothermally solidified zone (ISZ), athermally solidified zone (ASZ) and diffusion affected zone (DAZ) were studied. An inverse relationship between the bonding time and the wid...
The phase transformation during diffusion brazing of high chromium Ni-based Inconel 939 superalloy, using a ternary Ni-14.9 Cr-3.7 B (wt.%) interlayer was studied. The microstructural evolution during the bonding process was governed by isothermal solidification, athermal solidification and solid-state precipitation. A single-phase gamma solid solu...
Owing to the complex nature of the welding process as well as the time and cost required to fit distorted assemblies, prediction of welding distortion is of pivotal importance in the modern manufacturing industry. In the present study, an elastic FE analysis based on inherent deformation theory was conducted to predict welding distortion in Al5083...
