Abstract
The aluminum alloy 5083 is widely used as a structural material in marine applications due to very good corrosion resistance and low temperature mechanical properties. Friction stir welding, being a solid state process, offers several benefits over the traditional fusion welding processes. In this study, 10 mm thick AA5083–H321 plates were successfully friction stir welded and the welds were investigated for corrosion behavior using salt fog corrosion tests. The friction stir welds exhibited more corrosion rate compared to that of the base material. However, the corrosion rate was observed to decrease with increase in time of exposure. The cryogenic treatment was found to improve corrosion resistance of the base material and the welds. Furthermore, the corrosion rate increases with decrease in pH value of the salt solution. By and large, it is determined that the cryogenic treatment advantageously effects the corrosion behavior
Highlights
Friction stir welding (FSW) [1] is an important new welding technique with potentially significant application in manufacturing industries such as aerospace, automotive, railway and marine
Though friction stir welded joints are free from solidification-related defects, FSW joints are prone to other weld defects such as pin hole, tunnel defect, piping defect, kissing bond, zigzag line and cracks, due to improper flow of metal and insufficient consolidation of metal in the FSW region [23]
The macrograph revealed the formation of an onion structured weld nugget, which is considered to be a common feature in friction stir welded aluminum alloys
Summary
Friction stir welding (FSW) [1] is an important new welding technique with potentially significant application in manufacturing industries such as aerospace, automotive, railway and marine. Frictional heat causes the metal to soften and allows the tool to move along the joint line. The FSW process generates three distinct micro-structural zones: the weld nugget (WN), the thermo-mechanically- affected zone (TMAZ) and the heat-affected zone (HAZ). The WN is the region through which the tool pin passes, and experiences high deformation and high heat. It generally consists of fine equiaxed grains due to full recrystallization. The TMAZ adjacent to the nugget is the region where the metal is plastically deformed as well as heated, but this is not sufficient to cause recrystallization. The HAZ experiences only a heating effect, with no mechanical deformation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
