The effect of cryogenic applications on tensile strength of aluminum 2219-T87 T-joint welded by dual laser-beam bilateral synchronous welding

Tian, Shuai; Chen, Wenhua; Chen, Shuai; Gu, Yuanzhi; Gong, Xingru; Zhan, Xiaoli

doi:10.1016/j.jmapro.2020.05.020

Cited by 16 publications

(4 citation statements)

References 19 publications

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“…26,27 The value of the impact energy on the weld joints will decrease in proportion to the drop in temperature, and this condition is consistent with the effect of the impact test on aluminium 7xxx series where cryogenic temperature cause decreased impact strength due to the high strain rate involved during impact. [28][29][30] The fracture surface of the impact specimens has been compared with SEM between low temperatures and the lowest temperature. Figure 9 shows the fracture surfaces of impact specimens for BM AA5058-H112, weld joints AA5058-H112/ AA7075-T6 and BM AA7075-T6.…”

Section: Impact Test Of the Specimensmentioning

confidence: 99%

Rotary friction welding properties of AA5083-H112/AA7075-T6 joints: Parameter and low temperature effect

Sasmito,

Suhartono,

Sunyoto

2024

Materials Science and Technology

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This study presents experimental findings from rotary friction welding of AA5083-H112 and AA7075-T6, conducted at consistent 1700 rpm rotational speed with four time intervals. The focus was on exploring the welding parameters influence on joint properties, assessed through mechanical testing, metallography and hardness tests. Prolonged welding led to elevated temperatures, expanding the heat-affected zone, grain growth and microhardness at the interface. The temperatures effect on joint toughness was evaluated through Charpy impact testing at different temperatures, showing lower impact strength at −192 °C. Fracture surfaces exhibited increased micro voids and dimples as the temperatures decreased. The study highlighted a positive link between extended welding times and improved cryogenic impact strength and mechanical properties.

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Section: Impact Test Of the Specimensmentioning

confidence: 99%

Rotary friction welding properties of AA5083-H112/AA7075-T6 joints: Parameter and low temperature effect

Sasmito,

Suhartono,

Sunyoto

2024

Materials Science and Technology

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“…Based on the Hall-Patch effect, more grains per unit area leads to ner grain sizes. The resistances to the applied load and dislocation motion are enhanced to improve tensile strength [13] .…”

Section: Analysis Of Unmelted Gapmentioning

confidence: 99%

Welding Penetration and Mechanical Properties of Welded Joints of V-shaped Surface Grooves

Feng¹,

Weng²,

Yao

et al. 2022

Preprint

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The work focused on the forming quality of surface-groove backing welds of gas metal arc welding (GMAW). The Box-Behnken design in response surface methodology (RSM) was used to explore the effects of welding voltages, welding currents, welding speeds, and surface radians on the properties of welded joints. The mathematical model was established among process parameters and response indices of welded joints. Experimental results showed that the unmelted gap decreased with the increased welding voltage, welding current, welding speed, and surface radian. Tensile strength increased with the increased welding voltage and welding speed and decreased after increasing with the increased surface radian. Elongation first increased and then decreased with the increased welding voltage, welding speed, and surface radian. Optimal process parameters were obtained by minimizing the unmelted gap and maximizing the tensile strength and elongation: welding voltage = 32 V; welding current = 224 A; welding speed = 32 cm/min; surface radian = 14/36π rad. The errors of the unmelted gap, tensile strength, and elongation were 1.71%, 5.69%, and 1.27%, respectively, by comparing the predicted and actual values. Research results have essential theoretic guidance for improving the penetration and mechanical properties of complex surface grooves welded joints.

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“…The AA2219 aluminum alloy (Al-6.3 wt.% Cu) has been extensively used as an important structural material in constructing rocket fuel tanks, liquid oxygen, and liquid hydrogen tanks for space launch vehicles [1][2][3][4][5][6]. Excellent specific strength, ductility, corrosion resistance, and fracture toughness within the temperature range from -250 °C to 250 °C are some of the main advantages of this alloy for use in the aerospace industry [7][8][9][10][11][12]. Furthermore, compared to other high-strength aluminum alloys, which are characterized by poor weldability, the AA2219 alloy is an exception due to the alloying of copper, which can heal cracks by forming extra eutectics [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The influence of focusing current on the microstructure of 2219 high-strength aluminum alloy electron beam welded joints

Sahul,

Rusynyk

et al. 2024

Preprint

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The paper concerns the analysis of the influence of the focusing current on the microstructure of aluminum alloy welded joints produced by electron beam welding. 2219 high-strength aluminum copper alloy was used as the base material. 2219 aluminum alloy is extensively used in the aerospace industry due to its excellent mechanical properties, high strength-to-weight ratio, and good corrosion resistance. Fuselage skins, wing panels, and rocket fuel tanks are some of the applications of the mentioned alloy. Bead-on-plate welded joints were produced within the study. Focusing currents of 629, 634, 639, 644, and 649 mA were utilized. Focusing current 639 mA ensures a sharp focus. The higher focusing current resulted in the production of a smoother weld bead. The narrowest weld was recorded when 629 mA focusing current was used. In the case of focusing currents 639, 644, and 649 mA, it can be stated that the higher the focusing current, the narrower the weld root. Except for a slight deviation in the case of the 629 mA focusing current application, the higher the focusing current, the larger the cross-sectional area of weld metal. Furthermore, the higher the focusing current, i.e., set up the focus position above the surface of materials to be welded, the larger the dendrite size. The finest dendrites were observed in the case of 629 mA focusing current (under focusing of the electron beam). Contrarily, the coarsest dendrites were documented when the highest focusing current, i.e., 649 mA, was used (over-focusing of the electron beam).

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The effect of cryogenic applications on tensile strength of aluminum 2219-T87 T-joint welded by dual laser-beam bilateral synchronous welding

Cited by 16 publications

References 19 publications

Rotary friction welding properties of AA5083-H112/AA7075-T6 joints: Parameter and low temperature effect

Rotary friction welding properties of AA5083-H112/AA7075-T6 joints: Parameter and low temperature effect

Welding Penetration and Mechanical Properties of Welded Joints of V-shaped Surface Grooves

The influence of focusing current on the microstructure of 2219 high-strength aluminum alloy electron beam welded joints

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