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Precipitation Hardened Stainless Steel (PHSS) is one of the martensitic steels that possess exceptional strength and corrosion resistance. Because of its characteristics, this PHSS is exclusively adopted in numerous engineering uses such as nuclear, chemical and marine industries. Welding is one of the important methods of joining that helps to make weldments with better performance characteristics. Corrosion behaviour is one of the important characteristics that contribute hugely to marine and other corrosion-related environments and also this is the most common problem for most of the manufacturing industries. The goal of this study was to analyze the PHSS weldments’ corrosive behavior and compare it with that of the two commonly used welding processes, namely MIG and TIG. The corrosive properties of the weldments were evaluated using various mediums, such as nitric acid, ferric chloride, and Oxalic acid.

Laser Beam Welding (LBW) is one of the advanced methods of joining metals by fusion. The LBW process exhibits comparatively better welding performance than conventional processes and this method of welding approach is exclusively employed in higher volume applications such as automotive industries. One of the most common nickel alloys used in various engineering fields is Inconel 718. This material has high strength and corrosion resistance properties, and is commonly used in high-temperature applications, such as gas turbines and rocket engines. In this study, we aim to develop an artificial intelligence tool that can analyze the influence of various process variables on the design and performance of a metal. The experiments were planned using the design approach of Taguchi. An L27 orthogonal array was used for the experiments. The three performance measures are the top width, bottom width, and penetration.

Inconel 718 is a superalloy made from nickel that has exceptional mechanical properties. It has been widely used in the manufacturing of various components such as nuclear and aerospace aircraft. Due to its exceptional corrosion resistance, this material can be utilized in various environments. Due to the increasing number of challenges that come with conventional methods of welding, the use of advanced techniques has been developed to produce better and sound quality joints. One of these is Laser Beam Welding (LBW) technique. This method utilizes a high-intensity beam to create a better and more quality weld joints with improved mechanical properties. This study aims to develop multiple regression models that can be used to analyze the performance of laser beam welding on Inconel 718 alloy joints.

TWBs (tailored welded blanks) technology can open new avenues for obtaining components in the automotive, aerospace and electronics industries. Friction stir process (FSP) can control the properties by deep localized plastic deformation using the non-consumable tool. In this study, the primary objective is to investigate the effects of Graphene nanoparticles (GNPs) in AA7075 material and the effect of FSP graphene NPs on the forming limit curve of the TWBs through experiments. The micrographs of the weldment are obtained by metallography practices. Tensile specimens are separated for evaluating FSP weld zones. Obtained results exhibits the formability limit of AA7075 thin sheets and decrease FSP thin sheets formability as compared with the formability of base metals

Modern automobile applications such as petrol, diesel, and gaseous fuel injection system use dissimilar Inconel 718 (IN718) and Stainless Steel 304 (SS 304) joints. IN 718 is a precipitation-hardened austenitic nickel-based superalloy with exceptional qualities such as high strength, resistance to corrosion, greater toughness, as well as resistance to thermal induced fatigue at elevated temperatures (between 150 and 1500oC), while SS 304 is a T 300 Series austenitic stainless steel alloy that can be used successfully in wide range of applications due to greater resistance to corrosion, good high and low temperature strength and ductility with excellent weld ability and formability. To get a better understanding of the mechanical characteristics of these heterogeneous weldments, these alloy joints were created using laser beam welding, one of the most modern joining techniques for high-strength materials.

Over the last decade the utilization of laser sources has seen a marked increase with its reducing expenses and increasing productivity. Enabling technologies such as better process knowledge, better laser sources and systems, and on-going advances in Laser Beam Welding (LBW) processing technologies have all contributed to these accomplishments which include both macro and micro component fabrication through LBW. There are various existing applications that benefit from using challenging materials together, hence integrating dissimilar metals allows us to gain their benefits at a higher level and can be applied extensively for multiple applications. Metals with different mechanical and microstructural qualities and features such as high corrosion resistance and low specific weight are commonly chosen to fabricate dissimilar joints.

In this investigation, friction stir welding (FSW) was employed for joining HSLA steel plates (5 mm thick) of grade DMR249A in the development of light weight ship structures. This investigation aims to study the effect pre-heating temperature (PHT) on microstructure and mechanical properties of FSWed DMR249A steel-joints. The PHT of W99 tool was varied from 100 to 250°C. The optical microscopy (OM), scanning electron microscopy (SEM), and an elemental analysis of stir zone (SZ) of DMR249A steel-joint was carried out. The tensile properties, hardness and impact toughness of DMR249A steel-joints were evaluated and compared to BM and joints without PHT. Results disclosed that the DMR249A steel-joints made at PHT 100°C exhibited superior tensile properties and impact toughness compared to other joints. It is attributed to the evolution of finer acicular ferritic and upper bainitic microstructure with no debris of tool in SZ.