Friction Stir Welding is a solid-state joining technology increasingly being applied to aluminum and other alloys in the automotive and aerospace industry due to its advantages in microstructure and mechanical properties over conventional welding techniques. To further enhance the mechanical properties of the weld, post-weld solution heat treatment (PWSHT) is one option. Previous research has shown that Abnormal Grain Growth (AGG) usually occurs in the weld nugget during PWSHT due to nugget instability at elevated temperatures. The current investigation is conducted to understand AGG in AA2195 FSW nugget during PWSHT and to determine the effect of several factors like the effects of initial temper of the welded plate and the weld process parameters, the effect of annealing and plastic deformation (work hardening),temperature at which the weld is deformed (cold and hot processing) and also the PWSHT time. It was found that the initial temper does not significantly affect the as welded nugget microstructure. Results indicate AGG to be dominant in the nugget regions, which have smaller as-welded grain size and with residual strain. Sufficient work hardening (deformation at room temperature) was found to suppress AGG during subsequent SHT. Whereas, AGG prevails when deformed at high temperatures.
","abstract_html":"<p>Friction Stir Welding is a solid-state joining technology increasingly being applied to aluminum and other alloys in the automotive and aerospace industry due to its advantages in microstructure and mechanical properties over conventional welding techniques. To further enhance the mechanical properties of the weld, post-weld solution heat treatment (PWSHT) is one option. Previous research has shown that Abnormal Grain Growth (AGG) usually occurs in the weld nugget during PWSHT due to nugget instability at elevated temperatures. The current investigation is conducted to understand AGG in AA2195 FSW nugget during PWSHT and to determine the effect of several factors like the effects of initial temper of the welded plate and the weld process parameters, the effect of annealing and plastic deformation (work hardening),temperature at which the weld is deformed (cold and hot processing) and also the PWSHT time. It was found that the initial temper does not significantly affect the as welded nugget microstructure. Results indicate AGG to be dominant in the nugget regions, which have smaller as-welded grain size and with residual strain. Sufficient work hardening (deformation at room temperature) was found to suppress AGG during subsequent SHT. Whereas, AGG prevails when deformed at high temperatures.</p>","abstract_has_math":false,"creators":["Kundu, Anupam"],"institution":null,"degree_name":"M.S.","degree_level":"Campus Access Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Anthony Reynolds"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2010,"date_issued":"2010-01-01T08:00:00Z","date_published":"2010-01-01T08:00:00Z","updated_at":"2026-07-24T04:37:14Z","subjects":["Engineering","Mechanical Engineering","AA2195","Abnormal Grain Growth","Friction Stir Welding"],"languages":[],"rights":["© 2010, Anupam Kundu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarcommons.sc.edu/etd/2234","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Anthony Reynolds"]},{"key":"dc:creator","label":"Author","values":["Kundu, Anupam"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Campus Access Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering","Mechanical Engineering","AA2195","Abnormal Grain Growth","Friction Stir Welding"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["© 2010, Anupam Kundu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarcommons.sc.edu/etd/2234"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Friction Stir Welding is a solid-state joining technology increasingly being applied to aluminum and other alloys in the automotive and aerospace industry due to its advantages in microstructure and mechanical properties over conventional welding techniques. To further enhance the mechanical properties of the weld, post-weld solution heat treatment (PWSHT) is one option. Previous research has shown that Abnormal Grain Growth (AGG) usually occurs in the weld nugget during PWSHT due to nugget instability at elevated temperatures. The current investigation is conducted to understand AGG in AA2195 FSW nugget during PWSHT and to determine the effect of several factors like the effects of initial temper of the welded plate and the weld process parameters, the effect of annealing and plastic deformation (work hardening),temperature at which the weld is deformed (cold and hot processing) and also the PWSHT time. It was found that the initial temper does not significantly affect the as welded nugget microstructure. Results indicate AGG to be dominant in the nugget regions, which have smaller as-welded grain size and with residual strain. Sufficient work hardening (deformation at room temperature) was found to suppress AGG during subsequent SHT. Whereas, AGG prevails when deformed at high temperatures.
"]},{"key":"dc:title","label":"Title","values":["Abnormal Grain Growth of AA2195 Friction Stir Weld Nugget during Solution Heat Treatment"]}]}],"canonical_facts":{"dc:contributor":["Anthony Reynolds"],"dc:creator":["Kundu, Anupam"],"dc:description.abstract":["Friction Stir Welding is a solid-state joining technology increasingly being applied to aluminum and other alloys in the automotive and aerospace industry due to its advantages in microstructure and mechanical properties over conventional welding techniques. To further enhance the mechanical properties of the weld, post-weld solution heat treatment (PWSHT) is one option. Previous research has shown that Abnormal Grain Growth (AGG) usually occurs in the weld nugget during PWSHT due to nugget instability at elevated temperatures. The current investigation is conducted to understand AGG in AA2195 FSW nugget during PWSHT and to determine the effect of several factors like the effects of initial temper of the welded plate and the weld process parameters, the effect of annealing and plastic deformation (work hardening),temperature at which the weld is deformed (cold and hot processing) and also the PWSHT time. It was found that the initial temper does not significantly affect the as welded nugget microstructure. Results indicate AGG to be dominant in the nugget regions, which have smaller as-welded grain size and with residual strain. Sufficient work hardening (deformation at room temperature) was found to suppress AGG during subsequent SHT. Whereas, AGG prevails when deformed at high temperatures.
"],"dc:identifier":["https://scholarcommons.sc.edu/etd/2234"],"dc:rights":["© 2010, Anupam Kundu"],"dc:subject":["Engineering","Mechanical Engineering","AA2195","Abnormal Grain Growth","Friction Stir Welding"],"dc:title":["Abnormal Grain Growth of AA2195 Friction Stir Weld Nugget during Solution Heat Treatment"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Campus Access Thesis"],"thesis:degree_name":["M.S."]},"updated_at":"2026-07-24T04:37:14Z"}