Investigate the Influence of Mechanical Vibrations on the Hardness of Al5052 Weldments

Rao, M. Vykunta; Rao, P. Srinivasa; Babu, B. Surendra

doi:10.17485/ijst/2016/v9i39/95587

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…Recent VAW advancements are detailed in [8][9][10][11]. Mechanical oscillations in the welding process are typically generated by vibrating the part at a resonant frequency using a vibrator from the VSR process at frequencies below 150 Hz [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Vibration-Assisted Welding of 42CrMo4 Steel: Optimizing Parameters for Improved Properties and Weldability

Luca,

Roata,

Croitoru

et al. 2024

Materials

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This study advances the vibration-assisted welding (VAW) technique for joining medium-carbon, low-alloy steels, which are typically challenging to weld. Traditional welding methods suggest low linear energy and mandatory pre- and post-heating due to these steels’ poor weldability. However, VAW employs a vibrating table to maintain part vibration throughout the automatic MIG/MAG welding process. This study tested the VAW technique on 42CrMo4 steel samples, achieving satisfactory weld quality without the need for pre- and post-heating treatments. This research revealed that while vibration frequencies between 550 Hz and 9.5 kHz minimally affect the appearance of the weld joint, the oscillation acceleration has a significant impact. The acceleration along the weld axis (ax), combined with the welding speed and vibration frequency, affects the weld surface’s appearance, particularly its scaly texture and size. Lateral acceleration (ay) alters the seam width, whereas vertical acceleration (az) affects penetration depth at the root. Notably, if the effective acceleration (aef) surpasses 40 m/s2, there is a risk of molten metal expulsion from the weld pool or piercing at the joint’s base. The quality of the joints was assessed through macroscopic and microscopic structural analyses, micro-hardness tests in the weld zone, and bending trials. The mechanical properties of the VAW samples were found to be acceptable, with hardness slightly exceeding that of the samples subjected to pre- and post-heating. Moreover, the VAW process significantly reduced energy consumption and operational time. The employed vibration system, with a power rating of 100 W, operates for just a few minutes, resulting in substantially lower energy usage compared to the traditional pre- and post-heating method, which typically requires a 5 kW electric furnace.

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Section: Introductionmentioning

confidence: 99%

Vibration-Assisted Welding of 42CrMo4 Steel: Optimizing Parameters for Improved Properties and Weldability

Luca,

Roata,

Croitoru

et al. 2024

Materials

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“…Several research studies have been conducted on the influence of vibratory weld conditioning on resid- ual stress reduction [24][25][26]. Limited investigations were carried out about the effect of vibratory weld conditioning on microstructure and the tensile properties [27][28][29][30]. Moreover, variations of the yield strength in terms of welded samples grain size, due to vibratory weld conditioning are reported in [31].…”

Section: Introductionmentioning

confidence: 99%

The influence of the applied mechanical vibration during welding on the residual stress and the fatigue crack growth rate of AA-5083 aluminum alloy

Tamasgavabari¹,

Ebrahimi²,

Ma³

2020

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Vibratory weld conditioning (VWC) was performed on the AA-5083 aluminum alloy specimens while they were welded with gas metal arc welding (GMAW). The variables in this study were vibration forces range from 400-3150 N and vibration frequency of 50-90 Hz. Microstructure, residual stress, and fatigue crack growth behavior of the welded samples were examined. Fracture analysis was also undertaken after the fatigue crack growth test using a scanning electron microscope (SEM). The results show that compared to the no-vibration welded sample, with increasing vibration forces, the columnar structure was replaced by equiaxed grains, and the area fraction of equiaxed grains increased to 75 %. In contrast to the sample welded without vibration, residual stress decreased while vibration was applied during welding. On the other hand, the application of mechanical vibration during welding, at each given frequency of 50, 75, and 90 Hz caused residual stress decrement of about 36, 38, and 44 %. At low ΔK values, the crack growth rate is low in all welded specimens and is approximately similar to the crack growth rate of the no-vibration welded specimen. Tensile residual stress is an effective reason that caused the crack growth rate of the material to increase. K e y w o r d s : vibratory weld conditioning (VWC), equiaxed grain, residual stress, 5083 aluminum alloy, fatigue crack growth

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“…Rao, M. V.et.al., [13][14][15][16][17] done the same process with the aluminum alloys through TIG welding process. To improve the weld joint mechanical properties of the non-metals through welding vibrations are introduced.…”

Section: Introductionmentioning

confidence: 99%

Influence of Mode of Power Source on the Mechanical Properties of Vibratory Weld Joints

Rao*,

Prasad,

Suresh

2019

IJITEE

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Welding plays a major role in modern technology. During welding, a portion of the specimen is subjected to heating. Because of different heating and cooling cycles of the specimen, residual stresses induced in the specimen i.e., mechanical properties gets reduced. To enhance the mechanical properties there are different techniques are available i.e., thermal and non-thermal methods. Vibratory welding is the one of the non-thermal method; mechanical properties of steel specimens are analyzed under with and without vibrations under different power source condition. In this paper input parameters which are considered is straight polarity, reverse polarity and alternate current. Tensile and hardness property of the steel specimen are analyzed and compared with the without vibratory condition.

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Investigate the Influence of Mechanical Vibrations on the Hardness of Al5052 Weldments

Cited by 4 publications

References 12 publications

Vibration-Assisted Welding of 42CrMo4 Steel: Optimizing Parameters for Improved Properties and Weldability

Vibration-Assisted Welding of 42CrMo4 Steel: Optimizing Parameters for Improved Properties and Weldability

The influence of the applied mechanical vibration during welding on the residual stress and the fatigue crack growth rate of AA-5083 aluminum alloy

Influence of Mode of Power Source on the Mechanical Properties of Vibratory Weld Joints

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