Statistical analysis in tensile strength characteristics of friction welded joints of 1050, 2017, 6061 aluminum alloy to SUS304 stainless steel.

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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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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Comparative in Mechanical Behavior of 6061 Aluminum Alloy Welded by Pulsed GMAW with Different Filler Metals and Heat Treatments

Materials ◽

10.3390/ma12244157 ◽

2019 ◽

Vol 12 (24) ◽

pp. 4157 ◽

Cited By ~ 1

Author(s):

Isidro Guzmán ◽

Everardo Granda ◽

Jorge Acevedo ◽

Antonia Martínez ◽

Yuliana Dávila ◽

...

Keyword(s):

Heat Treatment ◽

Tensile Strength ◽

Aluminum Alloy ◽

Weld Joint ◽

Welding Process ◽

Mechanical Resistance ◽

6061 Aluminum Alloy ◽

Β Phase ◽

Welding Processes ◽

Filler Metals

Precipitation hardening aluminum alloys are used in many industries due to their excellent mechanical properties, including good weldability. During a welding process, the tensile strength of the joint is critical to appropriately exploit the original properties of the material. The welding processes are still under study, and gas metal arc welding (GMAW) in pulsed metal-transfer configuration is one of the best choices to join these alloys. In this study, the welding of 6061 aluminum alloy by pulsed GMAW was performed under two heat treatment conditions and by using two filler metals, namely: ER 4043 (AlSi5) and ER 4553 (AlMg5Cr). A solubilization heat treatment T4 was used to dissolve the precipitates of β”- phase into the aluminum matrix from the original T6 heat treatment, leading in the formation of β-phase precipitates instead, which contributes to higher mechanical resistance. As a result, the T4 heat treatment improves the quality of the weld joint and increases the tensile strength in comparison to the T6 condition. The filler metal also plays an important role, and our results indicate that the use of ER 4043 produces stronger joints than ER 4553, but only under specific processing conditions, which include a moderate heat net flux. The latter is explained because Mg, Si and Cu are reported as precursors of the production of β”- phase due to heat input from the welding process and the redistribution of both: β” and β precipitates, causes a ductile intergranular fracture near the heat affected zone of the weld joint.

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