Effect of Heat Input on Microstructure and Mechanical Properties of Friction Stir Welded AA2024 and AA7075 Dissimilar Alloys

2021 ◽  
Author(s):  
Shun Xiao ◽  
Yongfang Deng ◽  
Jincheng Zeng ◽  
Weichao Zhang ◽  
Lirong Huang
Keyword(s):  
Mechanical Properties ◽  
Heat Input ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties ◽  
Dissimilar Alloys

scholarly journals Effect of Rotation Speed on Microstructure and Mechanical Properties of Friction-Stir-Welded 2205 Duplex Stainless Steel

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Wenyang Wang ◽  
Ye Hu ◽  
Tong Wu ◽  
Dan Zhao ◽  
Hongwei Zhao
Keyword(s):  
Mechanical Properties ◽  
Heat Input ◽  
Rotation Speed ◽  
Steel Plates ◽  
Welding Temperature ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties ◽  
Joint Width ◽  
Thick Steel ◽  
Lower Heat

In the present study, 1.86-mm-thick steel plates (UNS S32205) were friction-stir-welded at various rotation speeds of 300 to 600 rpm and a constant welding speed of 100 mm·min−1. The effect of rotation speed on the microstructure and mechanical properties of the welds was researched. The welding temperature was recorded during friction stir welding (FSW), and the microstructure and mechanical properties of the welds were assessed. The incomplete penetration defect was formed at 300 rpm due to the insufficient heat input, and macroscopic groove-like defect was formed at 600 rpm because of the serious sticking of tool. Defect-free welds were obtained at 350 to 500 rpm. The lower rotation speed corresponds to lower heat input during FSW, which resulted in finer recrystallized grains within the stirred zone and thermomechanically affected zone. The joint width was increased with the increasing rotation speed. Therefore, both the strength and hardness of the weld joints increased with the decreasing of rotation speed.

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