Microstructure and Properties of 7005 Aluminum Alloy Welded Joints by CMT, TIG and FSW

AbstractThe main aim of this investigation is to produce a welding joint of higher strength than that of base metals. Composite welded joints were produced by friction stir welding process. 6061 aluminum alloy was used as a base metal and alumina particles added to welding zone to form metal matrix composites. The volume fraction of alumina particles incorporated in this study were 2, 4, 6, 8 and 10 vol% were added on both sides of welding line. Also, the alumina particles were pre-mixed with magnesium particles prior being added to the welding zone. Magnesium particles were used to enhance the bonding between the alumina particles and the matrix of 6061 aluminum alloy. Friction stir welded joints containing alumina particles were successfully obtained and it was observed that the strength of these joints was better than that of base metal. Experimental results showed that incorporating volume fraction of alumina particles up to 6 vol% into the welding zone led to higher strength of the composite welded joints as compared to plain welded joints.

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Void damage evolution of LF6 aluminum alloy welded joints under external load and thermal cycling conditions

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(09)60403-9 ◽

2010 ◽

Vol 20 (10) ◽

pp. 1968-1973 ◽

Cited By ~ 2

Author(s):

Guo-fa MI ◽

Da-wei ZHAO ◽

Cui-fen DONG ◽

Ji-tai NIU ◽

Cheng JIN

Keyword(s):

Aluminum Alloy ◽

Thermal Cycling ◽

Welded Joints ◽

External Load ◽

Damage Evolution ◽

Void Damage

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Influence of Stress Concentration on Fatigue Property of Welded Joints of 5083 Aluminum Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.456.451 ◽

2013 ◽

Vol 456 ◽

pp. 451-455

Author(s):

Jun Yang ◽

Bo Li ◽

Qiang Jia ◽

Yuan Xing Li ◽

Ming Yue Zhang ◽

...

Keyword(s):

Tensile Strength ◽

Aluminum Alloy ◽

Fatigue Strength ◽

Stress Concentration ◽

Welded Joints ◽

Weld Zone ◽

Fatigue Property ◽

Concentration Coefficient ◽

5083 Aluminum Alloy ◽

Stress Concentration Coefficient

Fatigue test of the welded joint of 5083 aluminum alloy with smooth and height of specimen and the weld zone than the high test measurement and theoretical stress concentration coefficient calculation, the weld reinforcement effect of stress concentration on the fatigue performance of welded joints. The results show that: Smooth tensile strength of specimens for 264MPa, fatigue strength is 95MPa, the tensile strength of the 36%. Higher tensile strength of specimens for 320MPa, fatigue strength is 70MPa, the tensile strength of the 22%. Higher specimen stress concentration coefficient is 1.64, the stress concentration to the weld toe becomes fatigue initiation source, and reduces the fatigue strength and the fatigue life of welded joints.

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