Fatigue life improvement of similar and dissimilar aluminum friction stir welds by deep rolling

被引:0
作者
Jan Schubnell
Antonia Müller
Ralf Boywitt
Oliver Maiß
Majid Farajian
机构
[1] Fraunhofer Institute for Mechanics of Materials (IWM),
[2] GSI Gesellschaft für Schweißtechnik International mbH,undefined
[3] Ecoroll Cooperation Tool Technology,undefined
[4] GSI Gesellschaft für Schweißtechnik International mbH,undefined
来源
Welding in the World | 2023年 / 67卷
关键词
Fatigue; Deep rolling; Friction stir welding; Residual stress; Surface roughness;
D O I
暂无
中图分类号
学科分类号
摘要
At the moment, high production costs prevent the friction stir welding (FSW) process from further industrial applications even if comparable high fatigue strength of the joints can be reached. Higher welding speed may reduce the production costs but decrease the fatigue strength of the manufactured FSW joints. A potential solution is a mechanical post weld treatment directly after welding to increase the fatigue strength of the FSW joint again. In this study, hydrostatic deep rolling was applied for fatigue strength improvement of similar and dissimilar FSW joints made of EN AW 5083 and EN AW 6082 alloys manufactured with different welding speed. Additionally, the fatigue strength was directly compared to conventional joints manufactured by metal inert gas (MIG) welding and to base material specimen made of EN AW 5083. The surface state in as-welded condition was characterized by surface roughness and residual stress measurements. Fatigue tests were performed to quantify the fatigue strength of the FSW joints. Similar compressive residual stresses were determined after deep rolling for similar and dissimilar joints. No fatigue life improvement was determined for deep-rolled similar joints made of EN AW 5083. However, in this condition, the fatigue life of the specimen was within the range of the base material. Thus, significant lower fatigue life and a high fatigue life improvement by deep rolling were reached for dissimilar joints. An increase of the welding speed from 300 to 800 mm/min strongly decreased the fatigue strength of dissimilar welded joints in the investigated case.
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页码:721 / 732
页数:11
相关论文
共 65 条
[1]  
Threadgilll PL(2013)Friction stir welding of aluminium alloys Int Mater Rev 54 49-93
[2]  
Leonard AJ(2003)Friction stir welding – recent developments in tool and process technologies Adv Eng Mater 5 485-490
[3]  
Shercliff HR(1995)Friction welding of St-Al and Al-Cu materials J Met Process Technol 49 431-443
[4]  
Withers PJ(2003)Microstructural and hardness investigation of an aluminum-copper alloy processed by laser surface melting Mater Charact 50 249-253
[5]  
Wayne Thomas BM(2020)Influence of tool parameters on the tensile properties of friction stir welded aluminium 5083 and 6082 alloys Mater Today Proc 27 951-957
[6]  
Johnson KI(2003)Weld tool travel speed effects on fatigue life of friction stir welds in 5083 aluminium Int J Fatigue 25 1389-1398
[7]  
Wiesner CS(2003)Influence of welding speed on the fatigue of friction stir welds, and comparison with MIG and TIG Int J Fatigue 25 1379-1387
[8]  
Thomas WM(2013)Friction stir welding of al alloys: analysis of processing parameters affecting mechanical behavior Procedia CIRP 11 139-144
[9]  
Johnson KI(2013)Microstructure and mechanical properties of friction stir welded aluminium alloys with special reference to AA 5083 and AA 6082 Sci Technol Weld Joining 5 285-296
[10]  
Wiesner CS(2014)Mechanical, fatigue and microstructural properties of friction stir welded 5083–H111 and 6082–T651 aluminum alloys Mater Des 56 84-90