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Research on Microstructure and Properties of Friction Stir Welded Joint of 6082-T6 Aluminum Alloy

Author: SunHongMei
Tutor: XuXiangYang;DongChunLin
School: Beijing Jiaotong University
Course: Materials Processing Engineering
Keywords: 6082-T6 aluminum alloy Friction Stir Welding Organization Performance Fracture
CLC: TG407
Type: Master's thesis
Year: 2009
Downloads: 374
Quote: 1
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Lightweight is the key to improving the overall performance of high-speed trains , lightweight aluminum alloy body . Aluminum alloy body fusion welding and manufacturing, and surviving a serious softening in the welded joints , fatigue and the impact of poor performance , large welding deformation . Friction stir welding is a new type of solid-phase welding technology , performance of welded joints , stress and deformation is small and abroad has its manufacturing , domestic hull for high-speed train body still blank . In this paper, for the application of high - speed train body background , a study of 6082-T6 aluminum alloy friction stir welding head of the organization and performance , from the structure, hardness, tensile properties and fatigue performance compared friction stir welding and TIG differences , to discuss the the FSW joint tissue formation mechanism , tensile fracture and fatigue fracture morphology analysis , clear the fracture mechanism . The study results show that : the weld nugget zone of FSW joints due to dynamic recrystallization small equiaxed grains , fine grain joints than MIG weld , the weld heat affected zone is narrower . FSW joints hardness higher than MIG welding , that FSW joints softening the degree mitigate . FSW joint tensile properties superior to the MIG welding head , wherein the tensile strength is increased 5%, the elongation is increased by 50% . The FSW joint tensile fracture dimples than MIG welding head size than MIG welding head is large and deep . FSW joint fatigue performance was significantly higher than the MIG welding, the number of fatigue cycles to 2 × 10 6 , FSW 84.5MPa fatigue strength is 24.4% higher than MIG . FSW and MIG welding on the fatigue fracture characteristics of fatigue bands , but the FSW fatigue stripe spacing smaller than MIG .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding general issues > Mechanical properties of welded joints and Intensity
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