Microstructure and Mechanical Behaviour of Dissimilar Laser Welded Joints for Automobile Applications

Abstract

<div class="section abstract"><div class="htmlview paragraph">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. Inconel 718 is a nickel-based superalloy that is extensively utilized in chemical, marine and nuclear power plant equipment, as well as aerospace applications for its outstanding corrosion resistance, creep resistance and exceptional mechanical qualities especially at high temperatures. Many automotive, aerospace and food processing industries are relying on SS304 due to its typical characteristics such as high strength and low cost. Hence it is necessary to research on bimetallic joints of Inconel 718 and SS304 in current manufacturing scenario. Dissimilar weldments of Inconel 718 (IN 718) and SS304 have been analysed in this study to determine the impact of LBW process parameters on the welds’ macro and microstructural properties. The weld parameters were shown to have a significant impact on the fabricated joint’s microstructural and mechanical characteristics, which in turn determine the joint’s overall quality.</div></div>