Mechanical Properties Enhancement in Dissimilar Weldments Fabricated Under Vibratory Weld Conditioning

Kalpana, J.; Rao, P. Srinivasa; Rao, P. Govinda

doi:10.1166/asem.2017.2026

Cited by 2 publications

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“…Therefore, the safety and reliability of mine hoist is one of the most important guarantees to ensure the safety of life and property. Vibration, as an important performance index in the fault diagnosis and testing of transmission system, can reflect the operation of the mechanism in the system to some extent, and can be used as the basis for the evaluation of mechanical operation quality [2], which has important reference value. However, traditional vibration testing equipment has many problems, such as large volume, complicated layout, and complex data transmission.…”

Section: Introductionmentioning

confidence: 99%

Application of vibration signal detection in mine hoist fault monitoring system

Fan¹,

Zhang²,

Han³

2023

J. meas. eng.

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Due to the harsh working environment and various types of faults in mine hoists, the implementation of conventional detection is relatively difficult. In order to improve the maintenance and fault detection efficiency of mine hoist, a portable vibration detection system is designed and applied in this paper, which can judge the type and characteristics of mechanical faults according to the different responses of vibration signals. According to the test conditions of the vibration system, the overall structure and functional composition of the hardware system are established. The key functional modules are designed, including signal conditioning module, main control module, vibration sensor and power management module. The main reasons that affect and produce the hoist fault and mechanical vibration are analyzed. The wavelet packet analysis method is proposed to realize the decomposition of low frequency and high frequency signals to improve the signal resolution of the whole frequency band in the frequency domain. The vibration test system has the function of real-time data transmission and control. The realization methods include WiFi and reserved RS485 communication interface, which can match the communication rate with the data sampling rate. The amplifying circuit of the electric signal is designed to effectively ensure that the output voltage of the charge amplifier is within the input range of the amplified ADC value. In order to verify the working effect of the system, the most common gearbox and bearing failures are taken as examples. The response signals of vibration test and diagnosis can be effectively obtained, and the fault types and characteristics can be accurately judged. Through confusion matrix analysis, the reliability of the system detection index is effectively verified. The research results show that the data of the vibration detection system is stable and reliable, and can achieve good troubleshooting effect. It also can be known that different fault types can excite different vibration responses, especially at resonance frequencies. According to the verification, the data of the vibration detection system is stable and reliable, and can achieve good troubleshooting effect.

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Section: Introductionmentioning

confidence: 99%

Application of vibration signal detection in mine hoist fault monitoring system

Fan¹,

Zhang²,

Han³

2023

J. meas. eng.

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“…Refined grain structure was the main reason for the improvement of mechanical characteristics (Rao et al, 2015a(Rao et al, , 2015b(Rao et al, , 2015c. Kalpna et al explored the vibration amplitude effect on mild steel and stainless steel weld connections (Kalpana et al, 2017). Residual stresses can also be decreased with the dynamic stress relief technique (Rao et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Vibratory weld conditioning during gas tungsten arc welding of al 5052 alloy on the mechanical and micro-structural behavior

Rao¹,

Rao

Babu

2020

WJE

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Purpose Vibratory weld conditioning parameters have a great influence on the improvement of mechanical properties of weld connections. The purpose of this paper is to understand the influence of vibratory weld conditioning on the mechanical and microstructural characterization of aluminum 5052 alloy weldments. An attempt is made to understand the effect of the vibratory tungsten inert gas (TIG) welding process parameters on the hardness, ultimate tensile strength and microstructure of Al 5052-H32 alloy weldments. Design/methodology/approach Aluminum 5052 H32 specimens are welded at different combinations of vibromotor voltage inputs and time of vibrations. Voltage input is varied from 50 to 230 V at an interval of 10 V. At each voltage input to the vibromotor, there are three levels of time of vibration, i.e. 80, 90 and 100 s. The vibratory TIG-welded specimens are tested for their mechanical and microstructural properties. Findings The results indicate that the mechanical properties of aluminum alloy weld connections improved by increasing voltage input up to 160 V. Also, it has been observed that by increasing vibromotor voltage input beyond 160 V, mechanical properties were reduced significantly. It is also found that vibration time has less influence on the mechanical properties of weld connections. Improvement in hardness and ultimate tensile strength of vibratory welded joints is 16 and 14%, respectively, when compared without vibration, i.e. normal weld conditions. Average grain size is measured as per ASTM E 112–96. Average grain size is in the case of 0, 120, 160 and 230 is 20.709, 17.99, 16.57 and 20.8086 µm, respectively. Originality/value Novel vibratory TIG welded joints are prepared. Mechanical and micro-structural properties are tested.

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Mechanical Properties Enhancement in Dissimilar Weldments Fabricated Under Vibratory Weld Conditioning

Cited by 2 publications

References 0 publications

Application of vibration signal detection in mine hoist fault monitoring system

Application of vibration signal detection in mine hoist fault monitoring system

Vibratory weld conditioning during gas tungsten arc welding of al 5052 alloy on the mechanical and micro-structural behavior

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